The Spatial Distribution of Water Components with Similar T2 May Provide Insight into Pathways for Large Molecule Transportation in the Brain.
CONCLUSION: From T2 component analysis it is possible to obtain some insight into pathways for the transport of large molecules in the CNS, where no lymphatic system is present. PMID: 32074590 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 19, 2020 Category: Radiology Authors: Oshio K, Yui M, Shimizu S, Yamada S Tags: Magn Reson Med Sci Source Type: research

Microcystic, Elongated and Fragmented Pattern Invasion Can Adversely Influence Preoperative Staging for Low-grade Endometrial Carcinoma.
CONCLUSION: In case of low-grade endometrial carcinoma with MELF pattern invasion, preoperative staging by CT and MRI have a risk for underestimation. PMID: 32074591 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 19, 2020 Category: Radiology Authors: Kuwahara R, Kido A, Yajima R, Nishio N, Nakao K, Kurata Y, Tanaka S, Minamiguchi S, Baba T, Mandai M, Togashi K Tags: Magn Reson Med Sci Source Type: research

Influence of Mild White Matter Lesions on Voxel-based Morphometry.
CONCLUSION: Our study showed that the detectability of brain volume change in VBM with gray matter images was not decreased by MWLs as lacunar infarctions. Therefore, we think that group comparisons with VBM should be analyzed by groups including and excluding subjects with MWLs, respectively. PMID: 32074592 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 19, 2020 Category: Radiology Authors: Goto M, Hagiwara A, Fujita S, Hori M, Kamagata K, Aoki S, Abe O, Sakamoto H, Sakano Y, Kyogoku S, Daida H Tags: Magn Reson Med Sci Source Type: research

Quick MR Neuromelanin Imaging Using a Chemical Shift Selective Pulse.
Abstract Not only magnetization transfer contrast (MTC) pulse, but also chemical shift selective (CHESS) pulse would be a useful additional one for shortening the scan time of neuromelanin imaging. We compared three sequences among turbo-spin echo (TSE) images with CHESS, MTC, and without an additional pulse in the same short time, 3 min 20 s. The TSE with CHESS image was the most useful for the diagnosis of neuromelanin within the limited time. PMID: 32074593 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 19, 2020 Category: Radiology Authors: Kusama M, Sato N, Kimura Y, Miyagi K Tags: Magn Reson Med Sci Source Type: research

4D Flow MR Imaging Reveals a Decrease of Left Atrial Blood Flow in a Patient with Cardioembolic Cerebral Infarction after Pulmonary Left Upper Lobectomy.
We present the case of a 76-year-old woman who underwent left upper lobectomy for lung adenocarcinoma. Three days after the surgery, a thrombus was observed in the pulmonary vein (PV) stump. Four months after the surgery, we performed 4D flow MRI, which revealed decreased blood flow, not only in the left superior PV stump, but also over a widespread region around the left atrium-left superior PV junction. 4D flow MRI can clarify the altered hemodynamics underlying thrombus formation. PMID: 32051361 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 13, 2020 Category: Radiology Authors: Matsumoto M, Takegahara K, Inoue T, Nakaza M, Sekine T, Usuda J Tags: Magn Reson Med Sci Source Type: research

Increased and More Heterogeneous Gadoxetic Acid Uptake of the Liver Parenchyma after Hepatitis C Virus Eradication by Direct Antiviral Agent.
Abstract We evaluated the changes of gadoxetic acid uptake of the liver parenchyma after hepatitis C virus (HCV) eradication by direct-antiviral agent (DAA) therapy. The increase rate of the liver-to-muscle signal intensity ratio, the skewness and the kurtosis were calculated in the hepatobiliary phase. After sustained virological response, gadoxetic acid uptake of the liver parenchyma increased, but became heterogeneous. Our study proved that HCV eradication by DAA therapy could significantly affect gadoxetic acid uptake. PMID: 32051362 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 13, 2020 Category: Radiology Authors: Fujita N, Nishie A, Asayama Y, Ishigami K, Nakayama T, Ushijima Y, Kakihara D, Takayama Y, Morita K, Ishimatsu K, Takao S, Yoshizumi T, Furusyo N, Honda H Tags: Magn Reson Med Sci Source Type: research

Errata.
Authors: PMID: 32037391 [PubMed - in process] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - February 12, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Confirmation of Age-dependence in the Leakage of Contrast Medium around the Cortical Veins into Cerebrospinal Fluid after Intravenous Administration of Gadolinium-based Contrast Agent.
Abstract PURPOSE: It has been reported previously that intravenously administered gadolinium-based contrast agent (GBCA) leaks into the subarachnoid space around the cortical veins at 4 h after injection in all old people over 37 years, but not in younger people up to 37 years of age in 3D-real IR images. The purpose of this study was to investigate whether there was a strict threshold of 37 years of age for the leakage of the GBCA into the subarachnoid space. METHODS: The subjects included 190 patients, that were scanned for 3D-real IR images at 4 hours after intravenous injection of GBCA as a diagnostic tes...
Source: Magnetic Resonance in Medical Sciences : MRMS - February 6, 2020 Category: Radiology Authors: Naganawa S, Ito R, Kawai H, Taoka T, Yoshida T, Sone M Tags: Magn Reson Med Sci Source Type: research

Optimal Plane Selection for Measuring Post-prandial Blood Flow Increase within the Superior Mesenteric Artery: Analysis Using 4D Flow and Computational Fluid Dynamics.
CONCLUSION: SMA velocimetry with 2D cine PC-MRI was dependent on the localization of the measurement planes. Distal straight section, not in the curved mid section is recommended for MR velocimetry. PMID: 32009062 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - January 31, 2020 Category: Radiology Authors: Sugiyama M, Takehara Y, Kawate M, Ooishi N, Terada M, Isoda H, Sakahara H, Naganawa S, Johnson KM, Wieben O, Wakayama T, Nozaki A, Kabasawa H Tags: Magn Reson Med Sci Source Type: research

Comparison of Chemical Exchange Saturation Transfer Imaging with Diffusion-weighted Imaging and Magnetic Resonance Spectroscopy in a Rat Model of Hypoxic-ischemic Encephalopathy.
CONCLUSION: CEST MTR maps did not correspond with the hyperintense areas on DWI at 0-2 and 24 hours after the onset of HIE. The change of multi offset CEST signal may be primarily related to the brain metabolites and pH alterations, such as that caused by lactate, after the onset of HIE. PMID: 32009063 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - January 31, 2020 Category: Radiology Authors: Ohki A, Saito S, Hirayama E, Takahashi Y, Ogawa Y, Tsuji M, Higuchi T, Fukuchi K Tags: Magn Reson Med Sci Source Type: research

A Novel Deep Learning Approach with a 3D Convolutional Ladder Network for Differential Diagnosis of Idiopathic Normal Pressure Hydrocephalus and Alzheimer's Disease.
CONCLUSIONS: Residual extraction approach in a deep learning method achieved a high accuracy for the differential diagnosis of iNPH, AD, and healthy controls trained with a small number of cases. PMID: 31969525 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - January 22, 2020 Category: Radiology Authors: Irie R, Otsuka Y, Hagiwara A, Kamagata K, Kamiya K, Suzuki M, Wada A, Maekawa T, Fujita S, Kato S, Nakajima M, Miyajima M, Motoi Y, Abe O, Aoki S Tags: Magn Reson Med Sci Source Type: research

Right Pulmonary Vein Atresia in a Mildly Symptomatic Boy: Comprehensive Analysis of Flow Dynamics Using Non-contrast-enhanced 4D Flow MR Imaging.
We present multimodal imaging in the rare case of isolated unilateral pulmonary vein atresia in a 6 year-old boy, including analysis of hemodynamics by magnetic resonance acquisition technique of time-resolved three-dimensional phase contrast imaging (4D flow magnetic resonance imaging). This novel imaging method enables the quantification and especially comprehensive visualization of blood flow patterns, even in complex congenital anomalies which abducted detailed assessment so far, and therefore constitutes a promising alternative to conventional vascular imaging techniques. PMID: 31956174 [PubMed - as supplied by p...
Source: Magnetic Resonance in Medical Sciences : MRMS - January 17, 2020 Category: Radiology Authors: Kromrey ML, Kise H, Hirose J, Yoshizawa M, Toda T, Kono Y, Sunaga Y, Johno H, Funayama S, Onishi H, Johnson K, Wieben O, Motosugi U Tags: Magn Reson Med Sci Source Type: research

Assessing the Risk of Intracranial Aneurysm Rupture Using Morphological and Hemodynamic Biomarkers Evaluated from Magnetic Resonance Fluid Dynamics and Computational Fluid Dynamics.
CONCLUSION: Both morphological and hemodynamic biomarkers have significant influence on intracranial aneurysm rupture. Aneurysm size, volume, size ratio, OSI and RRT could be potential biomarkers to assess aneurysm rupture risk. PMID: 31956175 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - January 17, 2020 Category: Radiology Authors: Perera R, Isoda H, Ishiguro K, Mizuno T, Takehara Y, Terada M, Tanoi C, Naito T, Sakahara H, Hiramatsu H, Namba H, Izumi T, Wakabayashi T, Kosugi T, Onishi Y, Alley M, Komori Y, Ikeda M, Naganawa S Tags: Magn Reson Med Sci Source Type: research

Relationship between Measurement Errors in Myocardial T1 Mapping and Heart Rate.
Abstract PURPOSE: Modified Look-Locker inversion recovery (MOLLI) using a 5s(3s)3s scheme is robust to tachycardia, but some errors are occasionally observed in myocardial T1 mapping. We sought to evaluate the relationship between measurement errors in T1 mapping and heart rate (HR) using a confidence map. METHODS: We enrolled 69 male patients with normal native T1 values of the septal myocardium measured by a 5s(3s)3s MOLLI. The degree of measurement errors in the septal myocardium was assessed by two independent observers on a confidence map using a 4-point scale: 0, no errors; 1, errors located on the myoc...
Source: Magnetic Resonance in Medical Sciences : MRMS - January 17, 2020 Category: Radiology Authors: Amano Y, Omori Y, Yanagisawa F, Ando C, Shinoda N, Suzuki Y, Yamamoto H, Matsumoto N Tags: Magn Reson Med Sci Source Type: research

The Utility of a Convolutional Neural Network for Generating a Myelin Volume Index Map from Rapid Simultaneous Relaxometry Imaging.
Abstract PURPOSE: A current algorithm to obtain a synthetic myelin volume fraction map (SyMVF) from rapid simultaneous relaxometry imaging (RSRI) has a potential problem, that it does not incorporate information from surrounding pixels. The purpose of this study was to develop a method that utilizes a convolutional neural network (CNN) to overcome this problem. METHODS: RSRI and magnetization transfer images from 20 healthy volunteers were included. A CNN was trained to reconstruct RSRI-related metric maps into a myelin volume-related index (generated myelin volume index: GenMVI) map using the MVI map calcula...
Source: Magnetic Resonance in Medical Sciences : MRMS - December 27, 2019 Category: Radiology Authors: Tachibana Y, Hagiwara A, Hori M, Kershaw J, Nakazawa M, Omatsu T, Kishimoto R, Yokoyama K, Hattori N, Aoki S, Higashi T, Obata T Tags: Magn Reson Med Sci Source Type: research

Biomedical Applications of the Dynamic Nuclear Polarization and Parahydrogen Induced Polarization Techniques for Hyperpolarized 13C MR Imaging.
Abstract Since the first pioneering report of hyperpolarized [1-13C]pyruvate magnetic resonance imaging (MRI) of the Warburg effect in prostate cancer patients, clinical dissemination of the technique has been rapid; close to 10 sites worldwide now possess a polarizer fit for the clinic, and more than 30 clinical trials, predominantly for oncological applications, are already registered on the US and European clinical trials databases. Hyperpolarized 13C probes to study pathophysiological processes beyond the Warburg effect, including tricarboxylic acid cycle metabolism, intra-cellular pH and cellular necrosis hav...
Source: Magnetic Resonance in Medical Sciences : MRMS - December 27, 2019 Category: Radiology Authors: Stewart NJ, Matsumoto S Tags: Magn Reson Med Sci Source Type: research

Microstrip Transmission Line RF Coil for a PET/MRI Insert.
CONCLUSION: The proposed PET-microstrip coil performed similarly to the conventional microstrip transmission line coil and is promising for the development of a compact coil-PET system capable of simultaneous PET/MRI analysis with an existing MRI system. PMID: 31776297 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - November 27, 2019 Category: Radiology Authors: Akram MSH, Obata T, Yaaya T Tags: Magn Reson Med Sci Source Type: research

Intracranial 3D and 4D MR Angiography Using Arterial Spin Labeling: Technical Considerations.
Abstract In the 1980's some of the earliest studies of arterial spin labeling (ASL) MRI have demonstrated its ability to generate MR angiography (MRA) images. Thanks to many technical improvements, ASL has been successfully moving its position from the realm of research into the clinical area, albeit more known as perfusion imaging than as MRA. For MRA imaging, other techniques such as time-of-flight, phase contrast MRA and contrast-enhanced (CE) MRA are more popular choices for clinical applications. In the last decade, however, ASL-MRA has been experiencing a remarkable revival, especially because of its non-inv...
Source: Magnetic Resonance in Medical Sciences : MRMS - November 22, 2019 Category: Radiology Authors: Suzuki Y, Fujima N, van Osch MJP Tags: Magn Reson Med Sci Source Type: research

Clinical Evaluation of Respiratory-triggered 3D MRCP with Navigator Echoes Compared to Breath-hold Acquisition Using Compressed Sensing and/or Parallel Imaging.
This study included 93 patients (45 men, mean age: 69.7 ± 9.3 years), in whom three types of 3D MRCP were performed: 3D breath-hold MRCP with CS and PI reconstruction (BH-CS-MRCP) and PI only reconstruction (BH-PI-MRCP) additionally to 3D respiratory triggered MRCP with navigator echoes (Nav-MRCP). Duct visualization and overall image quality were blindly evaluated on a four-point scale by two independent radiologists. Quantitative analysis was performed by calculating the relative duct-to-periductal contrast (RC) of three main biliary segments. Comparison between the methods was performed using paired t-test. ...
Source: Magnetic Resonance in Medical Sciences : MRMS - October 24, 2019 Category: Radiology Authors: Kromrey ML, Funayama S, Tamada D, Ichikawa S, Shimizu T, Onishi H, Motosugi U Tags: Magn Reson Med Sci Source Type: research

Evaluation of Thin-slice Coronal Single-shot Turbo Spin-echo Diffusion-weighted Imaging of the Hand: A Comparison with Conventional Echo-planar Diffusion-weighted Imaging.
Abstract We prospectively evaluated thin-slice coronal turbo spin-echo (TSE) diffusion-weighted imaging (DWI) covering a larger area with the recently-developed techniques on a 3T MRI scanner, compared with echo-planar imaging (EPI)-DWI in patients undergoing routine hand MRI. Visual score assessment and apparent diffusion coefficient (ADC) measurement were performed for patients with suspected hand tumors. TSE-DWI was superior to EPI-DWI, with less image distortion. The visual score and ADC comparison assessments proved that the image noise of TSE-DWI was acceptable. PMID: 31645537 [PubMed - as supplied by p...
Source: Magnetic Resonance in Medical Sciences : MRMS - October 24, 2019 Category: Radiology Authors: Ogawa M, Nakagawa M, Arai N, Kan H, Ohba S, Shibata S, Maki H, Shibamoto Y Tags: Magn Reson Med Sci Source Type: research

The Space between the Pial Sheath and the Cortical Venous Wall May Connect to the Meningeal Lymphatics.
Abstract We currently obtain pre- and post-contrast enhanced whole brain 3D-real inversion recovery images for the evaluation of endolymphatic hydrops. We noticed that the space between the pial sheath surrounding the cortical veins and the cortical venous wall is enhanced and this enhancement seems to connect to the meningeal lymphatics along superior sagittal sinus. This new anatomical concept regarding the outflow from the glymphatic system might be important for the future research in neuroscience. PMID: 31611540 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - October 15, 2019 Category: Radiology Authors: Naganawa S, Ito R, Taoka T, Yoshida T, Sone M Tags: Magn Reson Med Sci Source Type: research

Prediction of Hypoxia in Brain Tumors Using a Multivariate Model Built from MR Imaging and 18F-Fluorodeoxyglucose Accumulation Data.
CONCLUSION: A multivariate prediction model created using blood flow, vascular permeability, and glycometabolism parameters can predict the extent of hypoxia in FMISO-positive areas in patients with brain tumors. PMID: 31611541 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - October 15, 2019 Category: Radiology Authors: Shimizu Y, Kudo K, Kameda H, Harada T, Fujima N, Toyonaga T, Tha KK, Shirato H Tags: Magn Reson Med Sci Source Type: research

Impact of b-Value Sampling Scheme on Brain IVIM Parameter Estimation in Healthy Subjects.
CONCLUSION: Using an optimized distribution, data are sampled in a way that the IVIM signal decay is better described and less variance is obtained in the fitted parameters. The increased precision gained could help to detect small variations in IVIM parameters. PMID: 31611542 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - October 15, 2019 Category: Radiology Authors: Chabert S, Verdu J, Huerta G, Montalba C, Cox P, Riveros R, Uribe S, Salas R, Veloz A Tags: Magn Reson Med Sci Source Type: research

Demonstration of Human Fetal Bone Morphology with MR Imaging: A Preliminary Study.
This study was approved by our Institutional Review Board. Fetal specimens (n = 14) were scanned on a 3T MRI scanner using our newly-developed sequence. It is based on T2*-weighted imaging (TR, 12 ms; TE for opposed-phase imaging, 6.1 ms, for in-phase imaging, 7.3 ms; flip angle, 40°). The specimens were also scanned on a 320 detector-row CT scanner. Four radiologists visually graded and compared the visibility of the bone shape of eight regions on MRI- and CT-scans using a 5-point grading system. RESULTS: The diagnostic ability of MRI with respect to the 5th metacarpals, femur, fibula, and pelvis was superior to CT (all, P
Source: Magnetic Resonance in Medical Sciences : MRMS - October 15, 2019 Category: Radiology Authors: Matsubara Y, Higaki T, Tani C, Kamioka S, Harada K, Aoyama H, Nakamura Y, Akita T, Awai K Tags: Magn Reson Med Sci Source Type: research

Deep Learning Based Noise Reduction for Brain MR Imaging: Tests on Phantoms and Healthy Volunteers.
Abstract PURPOSE: To test whether our proposed denoising approach with deep learning-based reconstruction (dDLR) can effectively denoise brain MR images. METHODS: In an initial experimental study, we obtained brain images from five volunteers and added different artificial noise levels. Denoising was applied to the modified images using a denoising convolutional neural network (DnCNN), a shrinkage convolutional neural network (SCNN), and dDLR. Using these brain MR images, we compared the structural similarity (SSIM) index and peak signal-to-noise ratio (PSNR) between the three denoising methods. Two neuroradi...
Source: Magnetic Resonance in Medical Sciences : MRMS - September 4, 2019 Category: Radiology Authors: Kidoh M, Shinoda K, Kitajima M, Isogawa K, Nambu M, Uetani H, Morita K, Nakaura T, Tateishi M, Yamashita Y, Yamashita Y Tags: Magn Reson Med Sci Source Type: research

Novel Technique for Growth Plate Analysis Based on the Superposition of T1- and T2-weighted MR Imaging of Adolescent Wrists.
ski A Abstract In this article, a new method of information extraction on the basis of the differentiation of T1- and T2-weighted MR images is proposed. It relies on a technique of superposition of T1- and T2-weighted MR images with use of statistical dominance algorithm. On the basis of implemented image analysis, a reproducible extraction of growth zone of adolescent boys' wrists is possible. PMID: 31378761 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - August 2, 2019 Category: Radiology Authors: Obuchowicz R, Urbanik A, Piórkowski A Tags: Magn Reson Med Sci Source Type: research

A Fundamental Study Assessing the Diagnostic Performance of Deep Learning for a Brain Metastasis Detection Task.
CONCLUSIONS: Our research presented methodological fundamentals to evaluate diagnostic features in the visual recognition of DCNNs. Our series will help to conduct the accuracy investigation of computer diagnosis in medical imaging. PMID: 31353336 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - July 26, 2019 Category: Radiology Authors: Noguchi T, Uchiyama F, Kawata Y, Machitori A, Shida Y, Okafuji T, Yokoyama K, Inaba Y, Tajima T Tags: Magn Reson Med Sci Source Type: research

MR Imaging of Mushroom-like Skin Adnexal Tumors in the Scalp: A Report of Two Cases.
Abstract Few studies had been published regarding imaging findings of skin adnexal tumors. We experienced two giant cases of them with a characteristic mushroom-like growth pattern. MRI showed a circumscribed mushroom-like shaped mass extruding from the subcutaneous tissue with microcystic lesions. Although differentiation between benignancy and malignancy may be difficult by radiological examinations, MRI may be helpful to identify its origin and differentiate soft tissue tumors with skin adnexal tumors in having these imaging findings. PMID: 31292324 [PubMed - as supplied by publisher] (Source: Magnetic Res...
Source: Magnetic Resonance in Medical Sciences : MRMS - July 11, 2019 Category: Radiology Authors: Arai M, Nozaki T, Matsusako M, Zenke Y, Arai S, Matsui M, Suzuki K, Jinzaki M, Kurihara Y Tags: Magn Reson Med Sci Source Type: research

Validating an Empirical Mathematical Model for Dynamic Contrast-enhanced MR Imaging of Hand and Wrist Synovitis in Rheumatoid Arthritis: Correlation of Model Parameters with Clinical Disease Activity.
CONCLUSION: EMM could fit the DCE-MRI data of hand and wrist synovitis. AUC30 obtained from the uptake phase of the kinetic curve as well as A, β and Tpeak obtained throughout the kinetic curve might be effective to predict the clinical disease activity. PMID: 31292313 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - July 9, 2019 Category: Radiology Authors: Ochi J, Mori N, Mori Y, Mugikura S, Hitachi S, Itoi E, Takase K Tags: Magn Reson Med Sci Source Type: research

Comprehensive Evaluation of B1+-corrected FISP-based Magnetic Resonance Fingerprinting: Accuracy, Repeatability and Reproducibility of T1 and T2 Relaxation Times for ISMRM/NIST System Phantom and Volunteers.
This study aimed to evaluate comprehensively; accuracy, repeatability and reproducibility of T1 and T2 relaxation times measured by magnetic resonance fingerprinting using B1+-corrected fast imaging with steady-state precession (FISP-MRF). METHODS: The International Society of Magnetic Resonance in Medicine/National Institute of Standards and Technology (ISMRM/NIST) phantom was scanned for 100 days, and six healthy volunteers for 5 days using a FISP-MRF prototype sequence. Accuracy was evaluated on the phantom by comparing relaxation times measured by FISP-MRF with the reference values provided by the phantom manufact...
Source: Magnetic Resonance in Medical Sciences : MRMS - June 20, 2019 Category: Radiology Authors: Kato Y, Ichikawa K, Okudaira K, Taoka T, Kawaguchi H, Murata K, Maruyama K, Koerzdoerfer G, Pfeuffer J, Nittka M, Naganawa S Tags: Magn Reson Med Sci Source Type: research

Detection of IV-gadolinium Leakage from the Cortical Veins into the CSF Using MR Fingerprinting.
Sone M Abstract PURPOSE: It has been reported that leakage of intravenously administered gadolinium-based contrast agents (IV-GBCAs) into the cerebrospinal fluid (CSF) from the cortical veins even in healthy subjects can be detected using a highly sensitive pulse sequence such as heavily T2-weighted 3D fluid-attenuated inversion recovery and 3D-real inversion recovery (IR). The purpose of this study was to evaluate the feasibility of MR fingerprinting to detect GBCA leakage from the cortical veins after IV-GBCA. MATERIALS: Fourteen patients with suspected endolymphatic hydrops (EH) who received a single dose...
Source: Magnetic Resonance in Medical Sciences : MRMS - June 20, 2019 Category: Radiology Authors: Naganawa S, Nakane T, Kawai H, Taoka T, Kawaguchi H, Maruyama K, Murata K, Körzdörfer G, Pfeuffer J, Nittka M, Sone M Tags: Magn Reson Med Sci Source Type: research

An Accurate Dictionary Creation Method for MR Fingerprinting Using a Fast Bloch Simulator.
This study proposes an accurate method for creating a dictionary for magnetic resonance fingerprinting (MRF) using a fast Bloch image simulator. An MRF sequence based on a fast imaging with steady precession sequence and a numerical phantom were used for dictionary generation. Cartesian and spiral readout gradients were used for the Bloch image simulation. The validity and usefulness of the method for accurate dictionary creation were demonstrated by MRF parameter maps obtained by pattern matching with the dictionaries generated by the proposed method. PMID: 31217368 [PubMed - as supplied by publisher] (Source: Magnet...
Source: Magnetic Resonance in Medical Sciences : MRMS - June 20, 2019 Category: Radiology Authors: Kose R, Kose K Tags: Magn Reson Med Sci Source Type: research

Identification of a Dural Defect with Cine Phase Contrast MR Imaging.
PMID: 31217398 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - June 18, 2019 Category: Radiology Authors: Fukumoto G, Kanagaki M, Ishimoto T, Kitazumi K, Hara A, Kimura H Tags: Magn Reson Med Sci Source Type: research

Functional Assessment of Lumbar Nerve Roots Using Coronal-plane Single-shot Turbo Spin-echo Diffusion Tensor Imaging.
Abstract We investigated the usefulness of diffusion tensor imaging using single-shot turbo spin-echo sequence (TSE-DTI) in detecting the responsible nerve root by multipoint measurements of fractional anisotropy (FA) values. Five patients with bilateral lumbar spinal stenosis showing unilateral neurological symptoms were examined using TSE-DTI. In the spinal canal, FA values in the symptomatic side were lower than those in the asymptomatic side. TSE-DTI using multipoint measurements of FA values can differentiate the responsible lumbar nerve root. PMID: 31189790 [PubMed - as supplied by publisher] (Source: M...
Source: Magnetic Resonance in Medical Sciences : MRMS - June 13, 2019 Category: Radiology Authors: Sakai T, Aoki Y, Watanabe A, Yoneyama M, Ochi S, Miyati T Tags: Magn Reson Med Sci Source Type: research

Quantitative Susceptibility Mapping for Carotid Atherosclerotic Plaques: A Pilot Study.
Abstract PURPOSE: Identifying plaque components such as intraplaque hemorrhage, lipid rich necrosis, and calcification is important to evaluate vulnerability of carotid atherosclerotic plaque; however, conventional vessel wall MR imaging may fail to discriminate plaque components. We aimed to evaluate the components of plaques using quantitative susceptibility mapping (QSM), a newly developed post-processing technique to provide voxel-based quantitative susceptibilities. METHODS: Seven patients scheduled for carotid endarterectomy were enrolled. Magnitude and phase images of five-echo 3D fast low angle shot (...
Source: Magnetic Resonance in Medical Sciences : MRMS - May 31, 2019 Category: Radiology Authors: Ikebe Y, Ishimaru H, Imai H, Abe K, Izumo T, Morofuji Y, Ideguchi R, Morikawa M, Uetani M Tags: Magn Reson Med Sci Source Type: research

Comparison of q-Space Reconstruction Methods for Undersampled Diffusion Spectrum Imaging Data.
CONCLUSION: Undersampled data were best reconstructed by means of CSD in simulations and in vivo. MAP was more accurate in the extraction of propagator-based indices, particularly for in vivo data. PMID: 31080210 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - May 10, 2019 Category: Radiology Authors: Varela-Mattatall GE, Koch A, Stirnberg R, Chabert S, Uribe S, Tejos C, Stöcker T, Irarrazaval P Tags: Magn Reson Med Sci Source Type: research

The Utility of Applying Various Image Preprocessing Strategies to Reduce the Ambiguity in Deep Learning-based Clinical Image Diagnosis.
Abstract PURPOSE: A general problem of machine-learning algorithms based on the convolutional neural network (CNN) technique is that the reason for the output judgement is unclear. The purpose of this study was to introduce a strategy that may facilitate better understanding of how and why a specific judgement was made by the algorithm. The strategy is to preprocess the input image data in different ways to highlight the most important aspects of the images for reaching the output judgement. MATERIALS AND METHODS: T2-weighted brain image series falling into two age-ranges were used. Classifying each series in...
Source: Magnetic Resonance in Medical Sciences : MRMS - May 10, 2019 Category: Radiology Authors: Tachibana Y, Obata T, Kershaw J, Sakaki H, Urushihata T, Omatsu T, Kishimoto R, Higashi T Tags: Magn Reson Med Sci Source Type: research

MR Imaging of Parasitic Leiomyoma with Red Degeneration.
PMID: 31061267 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - May 7, 2019 Category: Radiology Authors: Araki H, Yoshizako T, Yoshida R, Maruyama M, Ishikawa N, Kitagaki H Tags: Magn Reson Med Sci Source Type: research

MR Imaging-based Evaluation of Mesenteric Ischemia Caused by Strangulated Small Bowel Obstruction and Mesenteric Venous Occlusion: An Experimental Study Using Rabbits.
CONCLUSION: Non-contrast MRI can be used to evaluate mesenteric ischemia caused by strangulated SBO and MVO. FS-T2WIs represented the best modality for depicting the high signal intensity in the bowel wall and mesentery caused by ischemia. PMID: 31061268 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - May 7, 2019 Category: Radiology Authors: Inoue A, Nitta N, Ota S, Takaki K, Imai Y, Misaki S, Iwai T, Sonoda A, Mukaisho KI, Murata K Tags: Magn Reson Med Sci Source Type: research

Quantification of Endolymphatic Space Volume after Intravenous Administration of a Single Dose of Gadolinium-based Contrast Agent: 3D-real Inversion Recovery versus HYDROPS-Mi2.
Abstract PURPOSE: Recently, the use of 3D real inversion recovery (3D-real IR) imaging has been proposed for the evaluation of endolymphatic hydrops (EH). This method shows similar contrast between the endolymphatic and perilymphatic spaces and surrounding bone compared with the hybrid of reversed image of positive endolymph signal and native image of perilymph signal multiplied with heavily T2-weighted MR cisternography (HYDROPS-Mi2) image. We measured the volume of the endolymphatic space using 3D-real IR and HYDROPS-Mi2 images, and compared the measurements obtained with both techniques. METHODS: HYDROPS-M...
Source: Magnetic Resonance in Medical Sciences : MRMS - May 7, 2019 Category: Radiology Authors: Ohashi T, Naganawa S, Takeuchi A, Katagiri T, Kuno K Tags: Magn Reson Med Sci Source Type: research

Utility of Stack-of-stars Acquisition for Hepatobiliary Phase Imaging without Breath-holding.
In this study, we compared the quality of hepatobiliary phase (HBP) imaging without breath-holding using the prototype pulse sequences stack-of-stars liver acquisition with volume acceleration (LAVA) (LAVA Star) with or without navigator echoes (LAVA Starnavi+ and LAVA Starnavi-) and Cartesian LAVA with navigator echoes (Cartesian LAVAnavi+). METHODS: Seventy-two patients were included in this single-center, retrospective, cross-sectional study. HBP imaging using the three LAVA sequences (Cartesian LAVAnavi+, LAVA Starnavi-, and LAVA Starnavi+) without breath-holding was performed for all patients using a 3T magnetic ...
Source: Magnetic Resonance in Medical Sciences : MRMS - May 7, 2019 Category: Radiology Authors: Ichikawa S, Motosugi U, Kromrey ML, Tamada D, Wakayama T, Wang K, Cashen TA, Ersoz A, Onishi H Tags: Magn Reson Med Sci Source Type: research

Motion Artifact Reduction Using a Convolutional Neural Network for Dynamic Contrast Enhanced MR Imaging of the Liver.
CONCLUSION: A deep learning-based method for removing motion artifacts in images obtained via DCE-MRI of the liver was demonstrated and validated. PMID: 31061259 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - April 26, 2019 Category: Radiology Authors: Tamada D, Kromrey ML, Ichikawa S, Onishi H, Motosugi U Tags: Magn Reson Med Sci Source Type: research

Numerical Experiments on the Contrast Capability of Magnetic Resonance Electrical Property Tomography.
CONCLUSION: The CC of MR EPT was related with the SNR of the magnetic field. A small EP contrast and size were necessary for detection at a high-SNR magnetic field. Obtaining a high-SNR magnetic field is important for improving the CC of MR EPT. PMID: 31019159 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - April 24, 2019 Category: Radiology Authors: Duan S, Zhu Y, Liu F, Xin SX Tags: Magn Reson Med Sci Source Type: research

Statistical Analysis of the Apparent Diffusion Coefficient in Patients with Clinically Mild Encephalitis/Encephalopathy with a Reversible Splenial Lesion Indicates That the Pathology Extends Well beyond the Visible Lesions.
Abstract PURPOSE: To investigate whether the genu of the corpus callosum is involved in patients with clinically mild encephalitis/encephalopathy with a reversible splenial lesion (MERS) type I. METHODS: Twenty-three cases of clinically confirmed MERS I were analyzed retrospectively, and MRI features of the lesion were observed. The apparent diffusion coefficient (ADC) values of the same region of interests in lesions at the splenium and genu of the corpus callosum were measured before and after treatment (i.e., four groups), and the average ADC values were calculated. Paired t-tests were used to compare the ...
Source: Magnetic Resonance in Medical Sciences : MRMS - April 5, 2019 Category: Radiology Authors: Qing Y, Xiong W, Da-Xiang H, Juan Z, Fei W, Yong-Qiang Y Tags: Magn Reson Med Sci Source Type: research

Signal Intensity within Cerebral Venous Sinuses on Synthetic MRI.
CONCLUSION: High signal intensity within the cerebral venous sinuses is a frequent finding on synthetic T1-weighted images. This corresponds to the hyperintensity noted at certain flow rates in the phantom experiment. PMID: 30956274 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - April 5, 2019 Category: Radiology Authors: Chougar L, Hagiwara A, Takano N, Andica C, Cohen-Adad J, Warntjes M, Maekawa T, Hori M, Koshino S, Nakazawa M, Abe O, Aoki S Tags: Magn Reson Med Sci Source Type: research

Analysis of Diffusion-weighted MR Images Based on a Gamma Distribution Model to Differentiate Prostate Cancers with Different Gleason Score.
This study included 155 patients with prostate cancer who underwent multiparametric magnetic resonance imaging prior to prostate biopsy (127 patients) or radical prostatectomy (28 patients) between January 2015 and June 2017; 159 foci of prostate cancer were included in our study. We compared cases scored as Gleason score (GS) 3 + 3 and GS ≥ 3 + 4, and analyzed cases scored as GS ≤ 3+ 4 and GS ≥ 4 + 3 based on the gamma model (Frac
Source: Magnetic Resonance in Medical Sciences : MRMS - March 26, 2019 Category: Radiology Authors: Tomita H, Soga S, Suyama Y, Ito K, Asano T, Shinmoto H Tags: Magn Reson Med Sci Source Type: research

Dynamic Contrast-enhanced Area-detector CT vs Dynamic Contrast-enhanced Perfusion MRI vs FDG-PET/CT: Comparison of Utility for Quantitative Therapeutic Outcome Prediction for NSCLC Patients Undergoing Chemoradiotherapy.
Abstract PURPOSE: To directly compare the utility for therapeutic outcome prediction of dynamic first-pass contrast-enhanced (CE)-perfusion area-detector computed tomography (ADCT), MR imaging assessed with the same mathematical method and 2-[fluorine-18]-fluoro-2-deoxy-d-glucose-positron emission tomography combined with CT (PET/CT) for non-small cell lung cancer (NSCLC) patients treated with chemoradiotherapy. MATERIALS AND METHODS: Forty-three consecutive stage IIIB NSCLC patients, consisting of 25 males (mean age ± standard deviation: 66.6 ± 8.7 years) and 18 females (66.4 ± 8.2 years...
Source: Magnetic Resonance in Medical Sciences : MRMS - March 18, 2019 Category: Radiology Authors: Seki S, Fujisawa Y, Yui M, Kishida Y, Koyama H, Ohyu S, Sugihara N, Yoshikawa T, Ohno Y Tags: Magn Reson Med Sci Source Type: research

Pseudo-random Trajectory Scanning Suppresses Motion Artifacts on Gadoxetic Acid-enhanced Hepatobiliary-phase Magnetic Resonance Images.
Abstract PURPOSE: Hepatobiliary-phase (HBP) MRI with gadoxetic acid facilitates the differentiation between lesions with and without functional hepatocytes. Thus, high-quality HBP images are required for the detection and evaluation of hepatic lesions. However, the long scan time may increase artifacts due to intestinal peristalsis, resulting in the loss of diagnostic information. Pseudo-random acquisition order disperses artifacts into the background. The aim of this study was to investigate the clinical applicability of pseudo-random trajectory scanning for the suppression of motion artifacts on T1-weighted imag...
Source: Magnetic Resonance in Medical Sciences : MRMS - March 18, 2019 Category: Radiology Authors: Nakamura Y, Higaki T, Nishihara T, Harada K, Takizawa M, Bito Y, Narita K, Akagi M, Matsubara Y, Kamioka S, Akiyama Y, Iida M, Awai K Tags: Magn Reson Med Sci Source Type: research

Hybrid of Compressed Sensing and Parallel Imaging Applied to Three-dimensional Isotropic T2-weighted Turbo Spin-echo MR Imaging of the Lumbar Spine.
Abstract PURPOSE: The hybrid compressed sensing (hybrid-CS) technique can shorten the acquisition time compared with the sensitivity encoding (SENSE) technique in lumbar MRI. To evaluate the feasibility of a hybrid-CS technique in comparison with 3D isotropic T2-weighted turbo spin-echo (3D volume isotropic turbo spin-echo acquisition [VISTA]) MRI of the lumbar spine. MATERIALS AND METHODS: The Institutional Review Board approved this study and informed consent was obtained from participants prior to study entry. Sixteen healthy volunteers underwent lumbar spine 3D VISTA with conventional parallel imaging for...
Source: Magnetic Resonance in Medical Sciences : MRMS - March 15, 2019 Category: Radiology Authors: Morita K, Nakaura T, Maruyama N, Iyama Y, Oda S, Utsunomiya D, Namimoto T, Kitajima M, Yoneyama M, Yamashita Y Tags: Magn Reson Med Sci Source Type: research

Langerhans Cell Histiocytosis with Multiple Fluid-fluid Levels in the Parietal Bone.
PMID: 30828044 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences : MRMS)
Source: Magnetic Resonance in Medical Sciences : MRMS - March 4, 2019 Category: Radiology Authors: Matsushita K, Shimono T, Miki Y Tags: Magn Reson Med Sci Source Type: research