Prediction of Sufficient Liver Enhancement on the Gadoxetate Disodium-enhanced Hepatobiliary Phase Imaging Using Transitional Phase Images and Albumin-bilirubin Grade.
Authors: Takatsu Y, Nakamura M, Kobayashi S, Miyati T Abstract PURPOSE: To investigate whether the contrast enhancement effect in hepatobiliary phase (HBP) images can be predicted using transitional phase (3-min delay) images on liver magnetic resonance imaging (MRI) based on the quantitative liver-spleen contrast ratio (Q-LSC) and albumin-bilirubin (ALBI) grade. METHODS: Overall, 212 patients (124 men and 88 women; mean age 66.7 ± 11.1 years) who underwent blood tests (assessed within 1 month of performing MRI) were included; patients with diffuse tumor, hepatectomy, splenectomy, Gamna-Gandy bodies in t...
Source: Magnetic Resonance in Medical Sciences - May 29, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Monte Carlo Simulator for Diffusion-weighted Imaging Sequences.
Authors: Tachibana Y, Duval T, Obata T Abstract We developed a Monte Carlo simulator for diffusion-weighted imaging sequences which displays the motion of water molecules and computes the dynamic phase dispersion due to the applied motion probing gradients. This simulator can be used to validate the analytical equations of diffusion models and understand their limitations due to their approximations. Here, we introduce the software and some specific use cases. The software can be downloaded from the following website: https://www.nirs.qst.go.jp/amr_diag. PMID: 32418924 [PubMed - as supplied by publisher] (Sourc...
Source: Magnetic Resonance in Medical Sciences - May 19, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Robust and Accurate Deep-Learning-based Method for the Segmentation of Subcortical Brain: Cross-dataset Evaluation of Generalization Performance.
Authors: Furuhashi N, Okuhata S, Kobayashi T Abstract PURPOSE: To analyze subcortical brain volume more reliably, we propose a deep learning segmentation method of subcortical brain based on magnetic resonance imaging (MRI) having high generalization performance, accuracy, and robustness. METHODS: First, local images of three-dimensional (3D) bounding boxes were extracted for seven subcortical structures (thalamus, putamen, caudate, pallidum, hippocampus, amygdala, and accumbens) from a whole brain MR image as inputs to the neural network. Second, dilated convolution layers, which input information of variable ...
Source: Magnetic Resonance in Medical Sciences - May 12, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Clinical Importance of Myocardial T2 Mapping and Texture Analysis.
Authors: Amano Y, Omori Y, Ando C, Yanagisawa F, Suzuki Y, Tang X, Kobayashi H, Takagi R, Matsumoto N Abstract Late gadolinium enhancement (LGE) magnetic resonance imaging (MRI) is valuable for diagnosis and assessment of the severity of various myocardial diseases owing to its potential to visualize myocardial scars. T1 mapping is complementary to LGE because it can quantify the degree of myocardial fibrosis or edema. As such, T1-weighted imaging techniques, including LGE using an inversion recovery sequence, contribute to cardiac MRI. T2-weighted imaging is widely used to characterize the tissue of many organs. T...
Source: Magnetic Resonance in Medical Sciences - May 12, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Visualization of Cerebrospinal Fluid Motion in the Whole Brain Using Three-dimensional Dynamic Improved Motion-sensitized Driven-equilibrium Steady-state Free Precession.
Authors: Horie T, Kajihara N, Saito H, Shibukawa S, Obara M, Ogino T, Niwa T, Kuroda K, Matsumae M Abstract The feasibility of the 3D dynamic improved motion-sensitized driven-equilibrium steady-state free precession (3D dynamic iMSDE SSFP) was evaluated for visualizing CSF motion and the appropriate parameters were determined. Both flow phantom and volunteer studies revealed that linear ordering and the shortest acquisition duration time were optimal. 3D dynamic iMSDE SSFP provides good quality imaging of CSF motion in the whole brain and enables visualization of flow in arbitrary planes from a single 3D volume sc...
Source: Magnetic Resonance in Medical Sciences - March 20, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Comparison of the Diagnostic Value of Mono-exponential, Bi-exponential, and Stretched Exponential Signal Models in Diffusion-weighted MR Imaging for Differentiating Benign and Malignant Hepatic Lesions.
Authors: Noda Y, Goshima S, Fujimoto K, Akamine Y, Kajita K, Kawai N, Matsuo M Abstract PURPOSE: To compare the diagnostic value of mono-exponential, bi-exponential, and stretched exponential diffusion-weighted imaging (DWI) for differentiating benign and malignant hepatic lesions. METHODS: This prospective study was approved by our Institutional Review Board and the patients provided written informed consent. Magnetic resonance imaging was acquired for 56 patients with suspected liver disease. This identified 90 focal liver lesions with a maximum diameter>10 mm, of which 47 were benign and 43 were malignant...
Source: Magnetic Resonance in Medical Sciences - March 13, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Turbo Spin-echo Diffusion-weighted Imaging Compared with Single-shot Echo-planar Diffusion-weighted Imaging: Image Quality and Diagnostic Performance When Differentiating between Ductal Carcinoma in situ and Invasive Ductal Carcinoma.
Authors: Mori N, Mugikura S, Miyashita M, Mori Y, Maekawa Y, Nagasaka T, Takase K Abstract PURPOSE: To compare the image quality between turbo spin-echo (TSE)-diffusion weighted imaging (DWI) and single-shot echo-planar imaging (EPI)-DWI, and to verify the diagnostic performance of the apparent diffusion coefficient (ADC) parameters of the two techniques by using histogram analysis in terms of differentiation between ductal carcinoma in situ (DCIS) and invasive ductal carcinoma (IDC) lesions. METHODS: Ninety-four women with 94 lesions diagnosed as breast cancer by surgery underwent IRB-approved preoperative mag...
Source: Magnetic Resonance in Medical Sciences - March 10, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Peritumoral Fat Content Correlates with Histological Prognostic Factors in Breast Carcinoma: A Study Using Iterative Decomposition of Water and Fat with Echo Asymmetry and Least-Squares Estimation (IDEAL).
This study consisted of 100 patients who were diagnosed with invasive carcinoma of breast and underwent breast MRI including IDEAL before surgery. The scan time of IDEAL fat fraction (FF) map imaging was 33 s. Four regions of interests (ROIs), which are a distance of 5 mm from the tumor edge, and one ROI in the mammary fat of the healthy side were set on the FF map. Then average peritumoral FF values (FFt), average FF values in the healthy side (FFh), and peritumoral fat ratio (pTFR: defined as FFt/FFh) were calculated. Histologically, the presence of lymph node metastasis and the MIB-1 index were evaluated. RESULTS: F...
Source: Magnetic Resonance in Medical Sciences - March 10, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Accelerated Acquisition of High-resolution Diffusion-weighted Imaging of the Brain with a Multi-shot Echo-planar Sequence: Deep-Learning-based Denoising.
Authors: Kawamura M, Tamada D, Funayama S, Kromrey ML, Ichikawa S, Onishi H, Motosugi U Abstract To accelerate high-resolution diffusion-weighted imaging with a multi-shot echo-planar sequence, we propose an approach based on reduced averaging and deep learning. Denoising convolutional neural networks can reduce amplified noise without requiring extensive averaging, enabling shorter scan times and high image quality. The preliminary experimental results demonstrate the superior performance of the proposed denoising method over state-of-the-art methods such as the widely used block-matching and 3D filtering. PMI...
Source: Magnetic Resonance in Medical Sciences - March 10, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Hemangioblastoma of the Cerebellopontine Angle Evaluated with Pseudocontinuous Arterial Spin Labeling.
We report a case of hemangioblastoma of the CPA evaluated by pseudocontinuous arterial spin labeling (pCASL). The high rate of tumor blood flow determined using pCASL provided additional useful information for the differential diagnosis of the CPA tumors in this patient. PMID: 32132312 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - March 7, 2020 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Interobserver Reliability When Classifying MR Imaging of the Lumbar Spine: Written Instructions Alone Do Not Suffice.
CONCLUSION: These data warrant the creation of publicly available standardised measurement examples of accepted classification systems to increase reliability of the interpretation of MR images. PMID: 31548477 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - September 25, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Imaging of Hypoxic Tumor: Correlation between Diffusion-weighted MR Imaging and 18F-fluoroazomycin Arabinoside Positron Emission Tomography in Head and Neck Carcinoma.
Authors: Imaizumi A, Obata T, Kershaw J, Tachibana Y, Inubushi M, Koizumi M, Yoshikawa K, Zhang MR, Tanimoto K, Harada R, Uno T, Saga T Abstract We investigated the usefulness of diffusion-weighted imaging (DWI) for detecting changes in the structure of hypoxic cells by evaluating the correlation between 18F-fluoroazomycin arabinoside (FAZA) positron emission tomography activity and DWI parameters in head and neck carcinoma. The diffusion coefficient corresponding to the slow compartment of a two-compartment model had a significant positive correlation with FAZA activity (ρ = 0.58, P = 0.016), whereas the diffu...
Source: Magnetic Resonance in Medical Sciences - September 25, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Correlation between Changes in the Transverse Relaxation Time and Electromyographic Measurements of the Superficial Masseter and Temporal Muscles.
Authors: Fujii T, Yamaguchi S, Sung YW, Watanabe M, Hattori Y Abstract We analyzed the correlations between the T2 shift and integrated electromyographic (iEMG) values in the masseter and temporal muscles. Six healthy adults engaged in a clenching task over two durations at various bite forces. We evaluated the mean T2 shift per voxel and assessed their correlations with iEMG using a linear mixed model. The regression coefficients were different for each muscle type, similar for the left and right sides, and decreased upon doubling duration. PMID: 31548479 [PubMed - as supplied by publisher] (Source: Magnetic R...
Source: Magnetic Resonance in Medical Sciences - September 25, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Compressed Sensing MR Imaging (CS-MRI) of the Knee: Assessment of Quality, Inter-reader Agreement, and Acquisition Time.
Authors: Matcuk GR, Gross JS, Fields BKK, Cen S Abstract We compared 3 Tesla (3T) compressed sensing (CS)-MRI of different pulse sequences with various acceleration factors to standard fast spin-echo (FSE) sequences in terms of time, quality, and inter-reader agreement. Each sequence was qualitatively ranked and then qualitatively scored for blurring, artifact, low contrast detection, noise pattern, signal-to-noise ratio, and overall quality. The CS-MRI sequences demonstrated very good overall quality compared with routine FSE sequences with overall good inter-reader agreement. PMID: 31548480 [PubMed - as suppl...
Source: Magnetic Resonance in Medical Sciences - September 25, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Errata.
Authors: Abstract [This corrects the article on p. 209 in vol. 16, PMID: 27795484.]. PMID: 31305772 [PubMed - in process] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - July 18, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Comparison of Silent Navigator Waveform Generation Methods.
Authors: Iwadate Y, Nozaki A, Nunokawa Y, Okuda S, Kabasawa H, Jinzaki M Abstract The silent navigator technique utilizes a non-selective excitation and an appropriate respiratory waveform generation method is necessary for an accurate motion detection. We compared three methods for silent navigator waveform generation. The profile generation method with coil selection (prof-selection) resulted in a high cross correlation with bellows signals and a large respiration amplitude. The prof-selection method should be used for silent navigator waveform generation. PMID: 31142703 [PubMed - as supplied by publisher] (S...
Source: Magnetic Resonance in Medical Sciences - June 1, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Steroid Cell Ovarian Tumor in a Case of von Hippel-Lindau Disease: Demonstrating Lipid Content of the Mass with MR Imaging.
Authors: Morani AC, Mubarak AI, Bhosale HR, Ramani NS, Waguespack SG, Ying A PMID: 30700659 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - February 1, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Evaluation of the Knees of Asymptomatic Kangoo Jumpers with MR Imaging.
CONCLUSION: This study reveals many types of knee MRI findings of asymptomatic Kangoo Jumpers compared to the control group. These MRI findings may be associated with acute knee injuries or chronic joint problems such as osteoarthritis, which may develop in long-term follow-up studies. PMID: 30700660 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - February 1, 2019 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Imaging of Cystic Lung Lesions in Infants Using Pointwise Encoding Time Reduction with Radial Acquisition (PETRA).
Authors: Nozawa K, Niwa T, Aida N PMID: 30504638 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Differentiating Alzheimer's Disease from Dementia with Lewy Bodies Using a Deep Learning Technique Based on Structural Brain Connectivity.
CONCLUSION: Our preliminary investigation revealed the adaptation of deep learning to the MR connectome and proposed its utility in the differentiation of dementia disorders at the individual subject level. PMID: 30504639 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Comparison of Techniques for Correcting Eddy-current and Motion-induced Distortions in Diffusion-weighted Echo-planar Images.
Authors: Haneda J, Hagiwara A, Hori M, Wada A, Fukunaga I, Murata K, Kamagata K, Fujita S, Maekawa T, Irie R, Takamura T, Suzuki M, Kunishima Kumamaru K, Aoki S Abstract The purpose of this study was to show the efficacy of dynamic field correction (DFC), a technique provided by the scanner software, in comparison to the FMRIB Software Library (FSL) post-processing "eddy" tool. DFC requires minimal additional scan time for the correction of eddy-current and motion-induced geometrical image distortions in diffusion-weighted echo-planar images. The fractional anisotropy derived from images corrected with DF...
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Improved Visualization of Middle Ear Cholesteatoma with Computed Diffusion-weighted Imaging.
Authors: Yamashita K, Hiwatashi A, Togao O, Kikuchi K, Shimomiya Y, Kamei R, Momosaka D, Matsumoto N, Kobayashi K, Takemura A, Kwee TC, Takahara T, Honda H Abstract Computed DWI (cDWI) is a mathematical technique that calculates arbitrary higher b value images from at least two different lower b values. In addition, the removal of high intensity noise with image processing on cDWI could improve cholesteatoma-background contrast-to-noise ratio (CNR). In the present study, noise reduction was performed by the cut-off values of apparent diffusion coefficient (ADC) less than 0 and 0.4 × 10-3 s/mm2. The cholesteat...
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Regression of White Matter Hyperintensity after Indirect Bypass Surgery in a Patient with Moyamoya Disease.
Authors: Hara S, Hori M, Inaji M, Maehara T, Aoki S, Nariai T PMID: 30518734 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Pitfall for Diffusion-weighted MR Imaging When Assessing the Response to Neoadjuvant Chemotherapy in Ewing Sarcoma.
Authors: Kasalak Ö, Suurmeijer AJH, De Haan JJ, Adams HJA, Jutte PC, Kwee TC PMID: 30518735 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - December 7, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

T2 Distribution in the Forearm Muscles and the T2 Threshold for Defining Activated Muscle.
Authors: Takamori M, Akiyama S, Yoshida K, Wakashin H, Seo Y Abstract PURPOSE: In order to detect exercised muscles by the increase in T2, we have defined a Gaussian T2 distribution and reference values (T2r and SDr) in resting state muscles, and a threshold for detecting exercised muscles. METHODS: The subjects were healthy adult volunteers (14 males and 12 females). Multiple-spin-echo (MSE) MR images were obtained with 10 TE values from 10 to 100 ms using a 0.2T MRI system. T2 values for 10 forearm muscles were obtained in the resting state and after isometric wrist flexion exercise with 5%, 15%, and 25% of t...
Source: Magnetic Resonance in Medical Sciences - November 20, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Usefulness of MR Imaging in Idiopathic Oculomotor Nerve Palsy Cases: T2-weighted IDEAL.
Authors: Nakajima H, Motomura M, Morikawa M, Ando T, Kawakami A, Tsujino A PMID: 30416177 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 13, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Diffusion Tensor Imaging of the Brachial Plexus: A Comparison between Readout-segmented and Conventional Single-shot Echo-planar Imaging.
Authors: Ho MJ, Ciritsis A, Manoliu A, Stieltjes B, Marcon M, Andreisek G, Kuhn FP Abstract PURPOSE: Diffusion tensor imaging (DTI) adds functional information to morphological magnetic resonance neurography (MRN) in the assessment of the brachial nerve plexus. To determine the most appropriate pulse sequence in scan times suited for diagnostic imaging in clinical routine, we compared image quality between simultaneous multi-slice readout-segmented (rs-DTI) and conventional single-shot (ss-DTI) echo-planar imaging techniques. METHODS: Institutional Review Board (IRB) approved study including 10 healthy voluntee...
Source: Magnetic Resonance in Medical Sciences - November 13, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Impact of the Number of Iterations in Compressed Sensing Reconstruction on Ultrafast Dynamic Contrast-enhanced Breast MR Imaging.
CONCLUSION: The kinetic parameters using ultrafast DCE-MRI with CS are affected by the number of iterations, especially in malignant lesions. However, if the images are reconstructed with an adequate number of iterations, ultrafast DCE-MRI with CS can be a powerful technique having high temporal and spatial resolution. PMID: 30416179 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 13, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Fast GPU-optimized 3D MRI Simulator for Arbitrary k-space Sampling.
CONCLUSION: The 3D MRI simulator developed for arbitrary k-space sampling optimized using GPUs is a powerful tool for the development and evaluation of advanced imaging sequences including both Cartesian and non-Cartesian k-space sampling. PMID: 30416180 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 13, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Signal Intensity of the Cerebrospinal Fluid after Intravenous Administration of Gadolinium-based Contrast Agents: Strong Contrast Enhancement around the Vein of Labbe.
CONCLUSION: The strong contrast enhancement of CSF space around the vein of Labbe was confirmed on hT2W-3D-FLAIR at 4 h after IV-GBCA compared to the PVS and the other CSF spaces. PMID: 30416181 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 13, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Age Dependence of Gadolinium Leakage from the Cortical Veins into the Cerebrospinal Fluid Assessed with Whole Brain 3D-real Inversion Recovery MR Imaging.
Authors: Naganawa S, Nakane T, Kawai H, Taoka T Abstract PURPOSE: It has been reported that intravenously administered gadolinium-based contrast agents (IV-GBCAs) leak into the cerebrospinal fluid (CSF) even in healthy subjects. The purpose of this study was to evaluate GBCA leakage from the cortical veins in patients with delayed imaging after IV-GBCA. MATERIALS AND METHODS: There are two parts of retrospective study. In the first part, we reviewed six patients with suspected endolymphatic hydrops (EH) who received a single dose of IV-GBCA (37-58 years old). The 3D-real inversion recovery images were obtained ...
Source: Magnetic Resonance in Medical Sciences - November 6, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

MR Imaging of a Leiomyosarcoma Arising in Leiomyoma.
Authors: Fujii S, Tsuda M, Mukuda N, Nosaka K, Sato S, Ogawa T PMID: 30393277 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 6, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Clinical Imaging of Glycogen-rich Clear Cell Carcinoma of the Breast: A Case Series with Literature Review.
Authors: Eun NL, Cha YJ, Son EJ, Gweon HM, Kim JA, Youk JH Abstract Glycogen-rich clear cell carcinoma (GRCC) of the breast is a rare malignant tumor. Most previous reports focused on clinicopathologic findings of GRCC and imaging findings were not precisely described. Here, we report imaging findings of three cases of GRCC along with a literature review. GRCC of the breast was depicted as a mass with irregular or oval shape on mammography and complex cystic and solid composition or focal cystic change on ultrasound. GRCC showed internal high signal intensity on T2-weighted MRI with rim enhancement after contrast i...
Source: Magnetic Resonance in Medical Sciences - September 4, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Small Granulosa Cell Tumor of the Ovary Incidentally Detected on Diffusion-weighted Images.
Authors: Inoue C, Fujii S, Nosaka K, Mukuda N, Fukunaga T, Ogawa T PMID: 30146532 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - August 28, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Development of a Surface Marker for Fractional Anisotropy Maps Using Wood in a Phantom Study.
CONCLUSION: The wood maker enabled direct localization in the FA map. Hence, wood markers may be useful to radiologists and contribute to obtaining useful findings. PMID: 29899170 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - June 15, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Inter-individual Comparison of Gadobutrol and Gadoteridol Tissue Time-intensity Profiles for Dynamic Susceptibility Contrast Perfusion MR Imaging.
CONCLUSION: The maximum signal drop was larger with gadobutrol when the injection speed was slow and the saline flush was small. Thus, gadobutrol may be useful to obtain a better profile for DSC perfusion MRI in conditions requiring a slower injection speed and/or a smaller volume of saline flush. PMID: 29794406 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - May 30, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

A Case of Uterine Tumor Resembling Ovarian Sex-cord Tumor (UTROSCT) Exhibiting Similar Imaging Characteristics to Those of Ovarian Sex-cord Tumor.
Authors: Takeuchi M, Matsuzaki K, Bando Y, Nishimura M, Hayashi A, Harada M PMID: 29794407 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - May 30, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Diffusion-weighting Caused by Spoiler Gradients in the Fast Imaging with Steady-state Precession Sequence May Lead to Inaccurate T2 Measurements in MR Fingerprinting.
In this study, we examined the effect of the diffusion weighting in MRF-FISP caused by spoiler gradients. The T2 relaxation times were greatly underestimated when large spoiler moments were used. The T2 underestimation was prominent for tissues with large values of T2 and diffusion coefficients. The T2 bias was almost independent of the apparent diffusion coefficient (ADC) and T2 values when the ADC map was measured and incorporated into the matching process. These results reveal that the T2 underestimation resulted from the diffusion weighting caused by the spoiler gradients. PMID: 29794408 [PubMed - as supplied by pu...
Source: Magnetic Resonance in Medical Sciences - May 30, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

The Reliability of Reduced Field-of-view DTI for Highly Accurate Quantitative Assessment of Cervical Spinal Cord Tracts.
CONCLUSION: Conventional DTI is unreliable owing to its susceptibility to the surrounding magnetic field. ZOOM DTI is reliable for performing highly accurate evaluations. PMID: 29576582 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - March 27, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Gadolinium-based Contrast Media, Cerebrospinal Fluid and the Glymphatic System: Possible Mechanisms for the Deposition of Gadolinium in the Brain.
Authors: Taoka T, Naganawa S Abstract After Kanda's first report in 2014 on gadolinium (Gd) deposition in brain tissue, a considerable number of studies have investigated the explanation for the observation. Gd deposition in brain tissue after repeated administration of gadolinium-based contrast medium (GBCM) has been histologically proven, and chelate stability has been shown to affect the deposition. However, the mechanism for this deposition has not been fully elucidated. Recently, a hypothesis was introduced that involves the 'glymphatic system', which is a coined word that combines 'gl' for glia cell and 'lymp...
Source: Magnetic Resonance in Medical Sciences - January 26, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Combining Segmented Grey and White Matter Images Improves Voxel-based Morphometry for the Case of Dilated Lateral Ventricles.
CONCLUSION: To our knowledge, this is the first VBM study to show the possibility that VBM of gray and white matter volume on the brain surface may be more affected by individual differences in the level of dilation of the lateral ventricles than by individual differences in gray and white matter volumes. We recommend that VBM evaluation in patients with iNPH should be performed using the brain image rather than the gray and white matter images. PMID: 29343657 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - January 19, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Differences in Signal Intensity and Enhancement on MR Images of the Perivascular Spaces in the Basal Ganglia versus Those in White Matter.
CONCLUSION: The signal intensity difference between the PVS in the BG versus WM on pre-contrast images suggests that the fluid composition might be different between these PVSs. The difference in the contrast enhancement between the PVSs in the BG versus WM suggests a difference in drainage function. PMID: 29343658 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - January 19, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Cardiac MR Imaging of Hypertrophic Cardiomyopathy: Techniques, Findings, and Clinical Relevance.
Authors: Amano Y, Kitamura M, Takano H, Yanagisawa F, Tachi M, Suzuki Y, Kumita S, Takayama M Abstract Hypertrophic cardiomyopathy (HCM) is a relatively common myocardial genetic disease having a wide variety of symptoms and prognoses. The most serious complications of HCM are sudden cardiac death induced by ventricular arrhythmia or inappropriate changes in blood pressure, and heart failure. Cardiac MR imaging is a valuable imaging method for detecting HCM because of its accurate measurement of wall thickness and myocardial mass without limited view and the unique ability of late gadolinium enhancement (LGE) to id...
Source: Magnetic Resonance in Medical Sciences - January 19, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

MR-guided Focused Ultrasound for Uterine Fibroids: A Preliminary Study of Relationship between the Treatment Outcomes and Factors of MR Images Including Elastography.
Authors: Ichikawa S, Motosugi U, Omori M, Sano K, Omiya Y, Hirata S, Onishi H Abstract We evaluated the value of magnetic resonance elastography (MRE) for the prediction of response to magnetic resonance-guided focused ultrasound (MRgFUS) for uterine fibroids. Eleven patients were enrolled. A fractional change of>30% in Symptoms Severity Score (SSS) was defined as a 'substantial symptomatic improvement' at 12 months after treatment. The fractional stiffness value reduction in the patients with a substantial improvement in SSS was significantly higher than that in those without (P = 0.0446). PMID: 29343660 [P...
Source: Magnetic Resonance in Medical Sciences - January 19, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Immobilization Technique for High-Resolution MR Imaging of the Testes.
Authors: Yamaguchi M, Fujii H Abstract Techniques for testis immobilization can facilitate high-resolution MR imaging applications for testicular diseases by assuring good positioning of the testis on small radiofrequency coils and reducing motion artifacts. We tested negative pressure suction to immobilize the testis of rats during MR image acquisitions. Suction pressure between -5 and -10 kPa assured good positioning, suppressed motion artifacts, and allowed the observation of blood vessels and seminiferous tubules. PMID: 29343661 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - January 19, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Differentiating between Alzheimer Disease Patients and Controls with Phase-difference-enhanced Imaging at 3T: A Feasibility Study.
CONCLUSION: Our results suggest the feasibility of PADRE imaging at 3T for differentiation between AD patients and control subjects. PMID: 29332926 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - January 16, 2018 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Indirect Proton MR Imaging and Kinetic Analysis of (17)O-Labeled Water Tracer in the Brain.
CONCLUSION: Steady-state sequences are feasible for indirect (17)O imaging with reasonable temporal resolution; this result is potentially important for the analysis of water kinetics and aquaporin function for several disorders. PMID: 29142152 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 17, 2017 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Quantitation Error in (1)H MRS Caused by B1 Inhomogeneity and Chemical Shift Displacement.
CONCLUSION: CSD and inhomogeneity of reception sensitivity cause amplitude modulation along the direction of chemical shift on the spectra, resulting in a quantitation error. This error may be more significant at higher B0 field where CSD and B1 inhomogeneity are more severe. This error may also occur in reception using a surface coil having inhomogeneous B1. Since this type of error is around a few percent, the data should be analyzed with greater attention while discussing small differences in the studies of (1)H MRS. PMID: 29118306 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - November 10, 2017 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Differentiation of Seromucinous Borderline Tumor from Serous Borderline Tumor on MR Imaging.
CONCLUSION: Higher CE ratio of the solid portion and exophytic growth were findings suggesting SBT. Higher intracystic fluid SI on T1WI and lower SI on T2WI suggested SMBT. MRI findings suggesting endometriosis favored the diagnosis of SMBT. PMID: 28993546 [PubMed - as supplied by publisher] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - October 11, 2017 Category: Radiology Tags: Magn Reson Med Sci Source Type: research

Errata.
Authors: PMID: 28993558 [PubMed - in process] (Source: Magnetic Resonance in Medical Sciences)
Source: Magnetic Resonance in Medical Sciences - October 11, 2017 Category: Radiology Tags: Magn Reson Med Sci Source Type: research