Calcification Remodeling Index Characterized by Cardiac CT as a Novel Parameter to Predict the Use of Rotational Atherectomy for Coronary Intervention of Lesions with Moderate to Severe Calcification.
Abstract OBJECTIVE: To assess the feasibility of calcification characterization by coronary computed tomography angiography (CCTA) to predict the use of rotational atherectomy (RA) for coronary intervention of lesions with moderate to severe calcification. MATERIALS AND METHODS: Patients with calcified lesions treated by percutaneous coronary intervention (PCI) who underwent both CCTA and invasive coronary angiography were retrospectively included in this study. Calcification remodeling index was calculated as the ratio of the smallest vessel cross-sectional area of the lesion to the proximal reference lumina...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Yu M, Li Y, Li W, Lu Z, Wei M, Zhang J Tags: Korean J Radiol Source Type: research

High-Pitch Coronary CT Angiography at 70 kVp Adopting a Protocol of Low Injection Speed and Low Volume of Contrast Medium.
Abstract OBJECTIVE: To evaluate the feasibility and image quality (IQ) of prospectively high-pitch coronary CT angiography (CCTA) with low contrast medium injection rate at 70 kVp. MATERIALS AND METHODS: One hundred and four patients with suspected coronary artery disease (body mass index
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Feng R, Tong J, Liu X, Zhao Y, Zhang L Tags: Korean J Radiol Source Type: research

A Review of the Use of Cardiac Computed Tomography for Evaluating the Mitral Valve before and after Mitral Valve Repair.
We describe assessments of the anatomy and coaptation geometric parameters of normal MVs, and also review repair of diseased/damaged MV. We also discuss pre- and post-surgical imaging of MV pathology using cardiac CT and various CT images. We found that cardiac CT could be used as an alternative imaging modality to echocardiography for pre-operative MV evaluation and to predict clinical outcomes following repair. PMID: 28860895 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Kim JH, Kim EY, Jin GY, Choi JB Tags: Korean J Radiol Source Type: research

CT Features of Vasculitides Based on the 2012 International Chapel Hill Consensus Conference Revised Classification.
This article presents the utility of CT in the diagnosis and differential diagnosis of vasculitides. PMID: 28860896 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Hur JH, Chun EJ, Kwag HJ, Yoo JY, Kim HY, Kim JJ, Lee KW Tags: Korean J Radiol Source Type: research

Percutaneous Dual-Switching Monopolar Radiofrequency Ablation Using a Separable Clustered Electrode: A Preliminary Study.
This study was approved by the Institutional Review Board, with informed consent obtained from all patients. Fifty-two HCC patients who underwent DSM-RFA using a separable clustered electrode and dual-generators were prospectively enrolled. Technical parameters, complications, technical success, technical effectiveness, and local tumor progression (LTP) rates were evaluated by means of post-procedural and follow-up imaging. Thereafter, the outcome of DSM-RFA was compared with those of 249 retrospectively included HCC patients treated with SSM-RFA. RESULTS: There were two major complications (3.8%, 2/52) including pleu...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Choi TW, Lee JM, Lee DH, Lee JH, Yu SJ, Kim YJ, Yoon JH, Han JK Tags: Korean J Radiol Source Type: research

Human Epidermal Growth Factor Receptor 2 Expression in Unresectable Gastric Cancers: Relationship with CT Characteristics.
Abstract OBJECTIVE: To retrospectively analyze the qualitative CT features that correlate with human epidermal growth factor receptor 2 (HER2)-expression in pathologically-proven gastric cancers. MATERIALS AND METHODS: A total of 181 patients with pathologically-proven unresectable gastric cancers with HER2-expression (HER2-positive [n = 32] and negative [n = 149]) were included. CT features of primary gastric and metastatic tumors were reviewed. The prevalence of each CT finding was compared in both groups. Thereafter, binary logistic regression determined the most significant differential CT features. Clini...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Lee JS, Kim SH, Im SA, Kim MA, Han JK Tags: Korean J Radiol Source Type: research

Photoacoustic Imaging for Differential Diagnosis of Benign Polyps versus Malignant Polyps of the Gallbladder: A Preliminary Study.
CONCLUSION: These preliminary results indicate that benign versus malignant gallbladder polyps might exhibit different spectral patterns on multispectral PA imaging. PMID: 28860899 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Chae HD, Lee JY, Jang JY, Chang JH, Kang J, Kang MJ, Han JK Tags: Korean J Radiol Source Type: research

Portal Vein Stenting for Delayed Jejunal Varix Bleeding Associated with Portal Venous Occlusion after Hepatobiliary and Pancreatic Surgery.
CONCLUSION: Interventional portal stenting is an effective treatment for delayed jejunal variceal bleeding due to portal occlusion after hepatobiliary-pancreatic surgery. PMID: 28860900 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Hyun D, Park KB, Cho SK, Park HS, Shin SW, Choo SW, Do YS, Choo IW, Choi DW Tags: Korean J Radiol Source Type: research

Correlation between Intravoxel Incoherent Motion Magnetic Resonance Imaging Derived Metrics and Serum Soluble CD40 Ligand Level in an Embolic Canine Stroke Model.
Abstract OBJECTIVE: To determine the relationship between intravoxel incoherent motion (IVIM) imaging derived quantitative metrics and serum soluble CD40 ligand (sCD40L) level in an embolic canine stroke model. MATERIALS AND METHODS: A middle cerebral artery occlusion model was established in 24 beagle dogs. Experimental dogs were divided into low- and high-sCD40L group according to serum sCD40L level at 4.5 hours after establishing the model. IVIM imaging was scanned at 4.5 hours after model establishment using 10 b values ranging from 0 to 900 s/mm(2). Quantitative metrics diffusion coefficient (D), pseudod...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Xu XQ, Wu CJ, Lu SS, Gao QQ, Zu QQ, Liu XL, Shi HB, Liu S Tags: Korean J Radiol Source Type: research

Optimal Factors of Diffusion Tensor Imaging Predicting Corticospinal Tract Injury in Patients with Brain Tumors.
Abstract OBJECTIVE: To identify the optimal factors in diffusion tensor imaging for predicting corticospinal tract (CST) injury caused by brain tumors. MATERIALS AND METHODS: This prospective study included 33 patients with motor weakness and 64 patients with normal motor function. The movement of the CST, minimum distance between the CST and the tumor, and relative fractional anisotropy (rFA) of the CST on diffusion tensor imaging, were compared between patients with motor weakness and normal function. Logistic regression analysis was used to obtain the optimal factor predicting motor weakness. RESULTS:...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Min ZG, Niu C, Zhang QL, Zhang M, Qian YC Tags: Korean J Radiol Source Type: research

A Novel Flow Diverter (Tubridge) for the Treatment of Recurrent Aneurysms: A Single-Center Experience.
CONCLUSION: In selected patients, the Tubridge FD can provide a safe and efficient option for the retreatment of recurrent aneurysms. Nevertheless, attention should be paid to several technical points. PMID: 28860903 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Zhang Y, Huang QH, Fang Y, Yang P, Xu Y, Hong B, Liu J Tags: Korean J Radiol Source Type: research

Combined Electrocardiography- and Respiratory-Triggered CT of the Lung to Reduce Respiratory Misregistration Artifacts between Imaging Slabs in Free-Breathing Children: Initial Experience.
Abstract OBJECTIVE: Cardiac and respiratory motion artifacts degrade the image quality of lung CT in free-breathing children. The aim of this study was to evaluate the effect of combined electrocardiography (ECG) and respiratory triggering on respiratory misregistration artifacts on lung CT in free-breathing children. MATERIALS AND METHODS: In total, 15 children (median age 19 months, range 6 months-8 years; 7 boys), who underwent free-breathing ECG-triggered lung CT with and without respiratory-triggering were included. A pressure-sensing belt of a respiratory gating system was used to obtain the respiratory...
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Goo HW, Allmendinger T Tags: Korean J Radiol Source Type: research

RE: Thyroid Core Needle Biopsy: The Strengths of Guidelines of the Korean Society of Thyroid Radiology.
PMID: 28860905 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - September 1, 2017 Category: Radiology Authors: Crescenzi A, Trimboli P Tags: Korean J Radiol Source Type: research

Dual-Energy CT: New Horizon in Medical Imaging.
Abstract Dual-energy CT has remained underutilized over the past decade probably due to a cumbersome workflow issue and current technical limitations. Clinical radiologists should be made aware of the potential clinical benefits of dual-energy CT over single-energy CT. To accomplish this aim, the basic principle, current acquisition methods with advantages and disadvantages, and various material-specific imaging methods as clinical applications of dual-energy CT should be addressed in detail. Current dual-energy CT acquisition methods include dual tubes with or without beam filtration, rapid voltage switching, dua...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Goo HW, Goo JM Tags: Korean J Radiol Source Type: research

Deep Learning in Medical Imaging: General Overview.
Abstract The artificial neural network (ANN)-a machine learning technique inspired by the human neuronal synapse system-was introduced in the 1950s. However, the ANN was previously limited in its ability to solve actual problems, due to the vanishing gradient and overfitting problems with training of deep architecture, lack of computing power, and primarily the absence of sufficient data to train the computer system. Interest in this concept has lately resurfaced, due to the availability of big data, enhanced computing power with the current graphics processing units, and novel algorithms to train the deep neural ...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Lee JG, Jun S, Cho YW, Lee H, Kim GB, Seo JB, Kim N Tags: Korean J Radiol Source Type: research

Influence of B1-Inhomogeneity on Pharmacokinetic Modeling of Dynamic Contrast-Enhanced MRI: A Simulation Study.
CONCLUSION: Even a small degree of B1-inhomogeneity can cause a significant error in the measurement of pharmacokinetic parameters on DCE-MRI, while the vulnerability of the pre-contrast R1 calculations to FA deviations is a significant cause of the miscalculation. PMID: 28670153 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Park B, Choi BS, Sung YS, Woo DC, Shim WH, Kim KW, Choi YS, Pae SJ, Suh JY, Cho H, Kim JK Tags: Korean J Radiol Source Type: research

Multiparametric MRI in the Detection of Clinically Significant Prostate Cancer.
JJ Abstract Prostate cancer is the most common cancer among men aged 50 years and older in developed countries and the third leading cause of cancer-related death in men. Multiparametric prostate MR imaging is currently the most accurate imaging modality to detect, localize, and stage prostate cancer. The role of multi-parametric MR imaging in the detection of clinically significant prostate cancer are discussed. In addition, insights are provided in imaging techniques, protocol, and interpretation. PMID: 28670154 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: F├╝tterer JJ Tags: Korean J Radiol Source Type: research

Ruptured Corpus Luteal Cyst: Prediction of Clinical Outcomes with CT.
CONCLUSION: The presence of active bleeding and the hemoperitoneum depth on a pretreatment CT scan can be predictive warning signs of surgery for a patient with a ruptured corpus luteal cyst with hemoperitoneum. PMID: 28670155 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Lee MS, Moon MH, Woo H, Sung CK, Jeon HW, Lee TS Tags: Korean J Radiol Source Type: research

Thyroid Radiofrequency Ablation: Updates on Innovative Devices and Techniques.
Abstract Radiofrequency ablation (RFA) is a well-known, effective, and safe method for treating benign thyroid nodules and recurrent thyroid cancers. Thyroid-dedicated devices and basic techniques for thyroid RFA were introduced by the Korean Society of Thyroid Radiology (KSThR) in 2012. Thyroid RFA has now been adopted worldwide, with subsequent advances in devices and techniques. To optimize the treatment efficacy and patient safety, understanding the basic and advanced RFA techniques and selecting the optimal treatment strategy are critical. The goal of this review is to therefore provide updates and analysis o...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Park HS, Baek JH, Park AW, Chung SR, Choi YJ, Lee JH Tags: Korean J Radiol Source Type: research

Analysis of Participant Factors That Affect the Diagnostic Performance of Screening Mammography: A Report of the Alliance for Breast Cancer Screening in Korea.
Abstract OBJECTIVE: To analyze participant factors that affect the diagnostic performance of screening mammography. MATERIALS AND METHODS: We enrolled 128756 cases from 10 hospitals between 2005 and 2010. We analyzed recall rate, cancer detection rate (CDR) per 1000 examinations, positive predictive value (PPV), sensitivity, specificity, false positive rate (FPR), and interval cancer rate (ICR) per 1000 negative examinations according to participant factors including age, breast density, and number of visit to the same institution, and adjusted for confounding variables. RESULTS: Increasing age improved ...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Kim YJ, Lee EH, Jun JK, Shin DR, Park YM, Kim HW, Kim Y, Kim KW, Lim HS, Park JS, Kim HJ, Jo HM, Alliance for Breast Cancer Screening in Korea (ABCS-K) Tags: Korean J Radiol Source Type: research

Estimation of Diastolic Filling Pressure with Cardiac CT in Comparison with Echocardiography Using Tissue Doppler Imaging: Determination of Optimal CT Reconstruction Parameters.
Abstract OBJECTIVE: To determine the optimal CT image reconstruction parameters for the measurement of early transmitral peak velocity (E), early peak mitral septal tissue velocity (E'), and E / E'. MATERIALS AND METHODS: Forty-six patients underwent simultaneous cardiac CT and echocardiography on the same day. Four CT datasets were reconstructed with a slice thickness/interval of 0.9/0.9 mm or 3/3 mm at 10 (10% RR-interval) or 20 (5% RR-interval) RR-intervals. The E was calculated by dividing the peak transmitral flow (mL/s) by the corresponding mitral valve area (cm(2)). E' was calculated from the changes i...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Hwang JS, Lee H, Lee B, Lee SJ, Jou SS, Lim HK, Suh J Tags: Korean J Radiol Source Type: research

Predictive Value of Cardiac Magnetic Resonance Imaging-Derived Myocardial Strain for Poor Outcomes in Patients with Acute Myocarditis.
CONCLUSION: CMR-derived ErrLax values can predict poor outcomes, both MACE and incomplete LV functional recovery, in patients with acute myocarditis, while LGE is only a predictor of MACE. PMID: 28670159 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Lee JW, Jeong YJ, Lee G, Lee NK, Lee HW, Kim JY, Choi BS, Choo KS Tags: Korean J Radiol Source Type: research

Assessment of Myocardial Bridge by Cardiac CT: Intracoronary Transluminal Attenuation Gradient Derived from Diastolic Phase Predicts Systolic Compression.
Abstract OBJECTIVE: To study the predictive value of transluminal attenuation gradient (TAG) derived from diastolic phase of coronary computed tomography angiography (CCTA) for identifying systolic compression of myocardial bridge (MB). MATERIALS AND METHODS: Consecutive patients diagnosed with MB based on CCTA findings and without obstructive coronary artery disease were retrospectively enrolled. In total, 143 patients with 144 MBs were included in the study. Patients were classified into three groups: without systolic compression, with systolic compression
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Yu M, Zhang Y, Li Y, Li M, Li W, Zhang J Tags: Korean J Radiol Source Type: research

Left Ventricular Functional Parameters and Geometric Patterns in Korean Adults on Coronary CT Angiography with a 320-Detector-Row CT Scanner.
This study retrospectively enrolled 172 subjects (107 men and 65 women; age, 58 ± 10.9 years; body surface area [BSA], 1.75 ± 0.2 m(2)) who underwent CCTA without any prior history of cardiac disease. The following parameters were measured by post-processing the CT data: LV volume, LV functional parameters (ejection fraction, stroke volume, cardiac output, etc.), LV myocardial mass, LV inner diameter, and LV myocardial thickness (including septal wall thickness [SWT], posterior wall thickness [PWT], and relative wall thickness [RWT = 2 × PWT / LV inner diameter]). All of the functional or volumetric par...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Kang EJ, Lee KN, Choi WJ, Kim YD, Shin KM, Lim JK, Lee J Tags: Korean J Radiol Source Type: research

The Blood Oxygenation T2(*) Values of Resectable Esophageal Squamous Cell Carcinomas as Measured by 3T Magnetic Resonance Imaging: Association with Tumor Stage.
This study included 48 ESCC patients and 20 healthy participants who had undergone esophageal T2(*)-weighted imaging to obtain T2(*) values of the tumors and normal esophagi. ESCC patients underwent surgical resections less than one week after imaging. Statistical analyses were performed to identify the association between T2(*) values of ESCCs and tumor stages. RESULTS: One-way ANOVA and Student-Newman-Keuls tests revealed that the T2(*) value could differentiate stage T1 ESCCs (17.7 ± 3.3 ms) from stage T2 and T3 tumors (24.6 ± 2.7 ms and 27.8 ± 5.6 ms, respectively; all ps 0.05) or between N st...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Tang YL, Zhang XM, Yang ZG, Huang YC, Chen TW, Chen YL, Chen F, Zeng NL, Li R, Hu J Tags: Korean J Radiol Source Type: research

T2(*) Mapping from Multi-Echo Dixon Sequence on Gadoxetic Acid-Enhanced Magnetic Resonance Imaging for the Hepatic Fat Quantification: Can It Be Used for Hepatic Function Assessment?
CONCLUSION: Incorporation of T2(*) mapping using 3D multi-echo Dixon GRE sequence in gadoxetic acid-enhanced liver MRI protocol may provide supplemental information for liver function deterioration in patients with SLD. PMID: 28670163 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Yoo H, Lee JM, Yoon JH, Kang HJ, Lee SM, Yang HK, Han JK Tags: Korean J Radiol Source Type: research

Texture Analysis of Torn Rotator Cuff on Preoperative Magnetic Resonance Arthrography as a Predictor of Postoperative Tendon Status.
Abstract OBJECTIVE: To evaluate texture data of the torn supraspinatus tendon (SST) on preoperative T2-weighted magnetic resonance arthrography (MRA) using the gray-level co-occurrence matrix (GLCM) for prediction of post-operative tendon state. MATERIALS AND METHODS: Fifty patients who underwent arthroscopic rotator cuff repair for full-thickness tears of the SST were included in this retrospective study. Based on 1-year follow-up, magnetic resonance imaging showed that 30 patients had intact SSTs, and 20 had rotator cuff retears. Using GLCM, two radiologists measured independantly the highest signal intensi...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Kang Y, Lee GY, Lee JW, Lee E, Kim B, Kim SJ, Ahn JM, Kang HS Tags: Korean J Radiol Source Type: research

Efficacy of Maximum Intensity Projection of Contrast-Enhanced 3D Turbo-Spin Echo Imaging with Improved Motion-Sensitized Driven-Equilibrium Preparation in the Detection of Brain Metastases.
Abstract OBJECTIVE: To evaluate the diagnostic benefits of 5-mm maximum intensity projection of improved motion-sensitized driven-equilibrium prepared contrast-enhanced 3D T1-weighted turbo-spin echo imaging (MIP iMSDE-TSE) in the detection of brain metastases. The imaging technique was compared with 1-mm images of iMSDE-TSE (non-MIP iMSDE-TSE), 1-mm contrast-enhanced 3D T1-weighted gradient-echo imaging (non-MIP 3D-GRE), and 5-mm MIP 3D-GRE. MATERIALS AND METHODS: From October 2014 to July 2015, 30 patients with 460 enhancing brain metastases (size> 3 mm, n = 150; size ≤ 3 mm, n = 310) were scanned wit...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Bae YJ, Choi BS, Lee KM, Yoon YH, Sunwoo L, Jung C, Kim JH Tags: Korean J Radiol Source Type: research

Splenial Lesions of the Corpus Callosum: Disease Spectrum and MRI Findings.
In this study, we classify the disease entities and describe imaging findings of lesions involving the splenium of the CC based on our experiences and a review of the literature. PMID: 28670166 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Park SE, Choi DS, Shin HS, Baek HJ, Choi HC, Kim JE, Choi HY, Park MJ Tags: Korean J Radiol Source Type: research

Radiation Dose Reduction without Compromise to Image Quality by Alterations of Filtration and Focal Spot Size in Cerebral Angiography.
CONCLUSION: Addition of filtration for angiographic exposure studies can result in significant total radiation dose reduction without loss of image quality. Focal spot size does not influence radiation dose and image quality. The routine angiographic protocol should be judiciously investigated and implemented. PMID: 28670167 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Kim DJ, Park MK, Jung DE, Kang JH, Kim BM Tags: Korean J Radiol Source Type: research

Value of Repeat Brain MRI in Children with Focal Epilepsy and Negative Findings on Initial MRI.
CONCLUSION: Repeat MRI revealed positive results in 21% of the children with initial MRI-negative focal epilepsy, with 50% of the positive results considered as potential epileptogenic lesions. Enhanced MRI techniques or considering the chronological changes of lesions on MRI may improve the diagnostic yield for identification of potential epileptogenic lesions on repeat MRI. PMID: 28670168 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Jeon TY, Kim JH, Lee J, Yoo SY, Hwang SM, Lee M Tags: Korean J Radiol Source Type: research

CT Quantification of Lungs and Airways in Normal Korean Subjects.
Abstract OBJECTIVE: To measure and compare the quantitative parameters of the lungs and airways in Korean never-smokers and current or former smokers ("ever-smokers"). MATERIALS AND METHODS: Never-smokers (n = 119) and ever-smokers (n = 45) who had normal spirometry and visually normal chest computed tomography (CT) results were retrospectively enrolled in this study. For quantitative CT analyses, the low attenuation area (LAA) of LAAI-950, LAAE-856, CT attenuation value at the 15th percentile, mean lung attenuation (MLA), bronchial wall thickness of inner perimeter of a 10 mm diameter airway (Pi10)...
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Kim SS, Jin GY, Li YZ, Lee JE, Shin HS Tags: Korean J Radiol Source Type: research

RE: Should We Use a Monopolar or Bipolar Mode for Performing No-Touch Radiofrequency Ablation of Liver Tumors? Clinical Practice Might have Already Resolved the Matter Once and for All.
PMID: 28670170 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - July 1, 2017 Category: Radiology Authors: Seror O, Sutter O Tags: Korean J Radiol Source Type: research

Hepatic Lesions that Mimic Metastasis on Radiological Imaging during Chemotherapy for Gastrointestinal Malignancy: Recent Updates.
Abstract During chemotherapy in patients with gastrointestinal malignancy, the hepatic lesions may occur as chemotherapy-induced lesions or tumor-associated lesions, with exceptions for infectious conditions and other incidentalomas. Focal hepatic lesions arising from chemotherapy-induced hepatopathies (such as chemotherapy-induced sinusoidal injury and steatosis) and tumor-associated eosinophilic abscess should be considered a mimicker of metastasis in patients with gastrointestinal malignancy. Accumulating evidence suggests that chemotherapy for gastrointestinal malignancy in the liver has roles in both the ther...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: You SH, Park BJ, Kim YH Tags: Korean J Radiol Source Type: research

Diagnosis of Hepatocellular Carcinoma with Gadoxetic Acid-Enhanced MRI: 2016 Consensus Recommendations of the Korean Society of Abdominal Radiology.
Abstract Diagnosis of hepatocellular carcinoma (HCC) with gadoxetic acid-enhanced liver magnetic resonance imaging (MRI) poses certain unique challenges beyond the scope of current guidelines. The regional heterogeneity of HCC in demographic characteristics, prevalence, surveillance, and socioeconomic status necessitates different treatment approaches, leading to variations in survival outcomes. Considering the medical practices in Korea, the Korean Society of Abdominal Radiology (KSAR) study group for liver diseases has developed expert consensus recommendations for diagnosis of HCC by gadoxetic acid-enhanced MRI...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Korean Society of Abdominal Radiology Tags: Korean J Radiol Source Type: research

Quantitative Measurement of Hepatic Fibrosis with Gadoxetic Acid-Enhanced Magnetic Resonance Imaging in Patients with Chronic Hepatitis B Infection: A Comparative Study on Aspartate Aminotransferase to Platelet Ratio Index and Fibrosis-4 Index.
This study on gadoxetic acid-enhanced 3T MR imaging included 81 patients with CHB infection. To quantitatively measure hepatic fibrosis, MR images were analyzed with an aim to identify inhomogeneous signal intensities calculated from a coefficient of variation (CV) map in the liver parenchyma. We also carried out a comparative analysis between APRI and FIB-4 based on metaregression results. The diagnostic performance of the CV map was evaluated using a receiver-operating characteristic (ROC) curve. RESULTS: In the MR images, the mean CV values in control, groups I, II, and III based on APRI were 4.08 ± 0.92, 4....
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Lee GM, Kim YR, Ryu JH, Kim TH, Cho EY, Lee YH, Yoon KH Tags: Korean J Radiol Source Type: research

Gastrointestinal Involvement of Recurrent Renal Cell Carcinoma: CT Findings and Clinicopathologic Features.
CONCLUSION: GI involvement of recurrent RCC could be included in the differential diagnosis of patients with heterogeneous, hyperenhanced intraluminal polypoid masses in the small bowel on CT scans along with a relative paucity of lymphadenopathy. PMID: 28458597 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Park HJ, Kim HJ, Park SH, Lee JS, Kim AY, Ha HK Tags: Korean J Radiol Source Type: research

Innovative Techniques for Image-Guided Ablation of Benign Thyroid Nodules: Combined Ethanol and Radiofrequency Ablation.
Abstract In the treatment of benign thyroid nodules, ethanol ablation (EA), and radiofrequency ablation (RFA) have been suggested for cystic and solid thyroid nodules, respectively. Although combining these ablation techniques may be effective, no guidelines for or reviews of the combination have been published. Currently, there are three ways of combining EA and RFA: additional RFA is effective for treatment of incompletely resolved symptoms and solid residual portions of a thyroid nodule after EA. Additional EA can be performed for the residual unablated solid portion of a nodule after RFA if it is adjacent to c...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Park HS, Baek JH, Choi YJ, Lee JH Tags: Korean J Radiol Source Type: research

Abbreviated MRI Protocols for Detecting Breast Cancer in Women with Dense Breasts.
CONCLUSION: The AP may be efficient in the breast cancer screening of dense breast tissue. FAST and MIP images combined with DWI of MRI are helpful to improve the specificity of breast cancer detection. PMID: 28458599 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Chen SQ, Huang M, Shen YY, Liu CL, Xu CX Tags: Korean J Radiol Source Type: research

Diagnostic Performance of Coronary CT Angiography, Stress Dual-Energy CT Perfusion, and Stress Perfusion Single-Photon Emission Computed Tomography for Coronary Artery Disease: Comparison with Combined Invasive Coronary Angiography and Stress Perfusion Cardiac MRI.
CONCLUSION: The combination of CCTA and DE-CTP enhances specificity without a loss of sensitivity for detecting hemodynamically significant coronary artery stenosis, as defined by combined ICA and SP-CMR. PMID: 28458600 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Chung HW, Ko SM, Hwang HK, So Y, Yi JG, Lee EJ Tags: Korean J Radiol Source Type: research

Characteristics Detected on Computed Tomography Angiography Predict Coronary Artery Plaque Progression in Non-Culprit Lesions.
CONCLUSION: Noninvasive assessment of NCLs by CCTA has potential prognostic value. PMID: 28458601 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Tan Y, Zhou J, Zhou Y, Yang X, Yang J, Chen Y Tags: Korean J Radiol Source Type: research

Quality of Radiomic Features in Glioblastoma Multiforme: Impact of Semi-Automated Tumor Segmentation Software.
Abstract OBJECTIVE: The purpose of this study was to evaluate the reliability and quality of radiomic features in glioblastoma multiforme (GBM) derived from tumor volumes obtained with semi-automated tumor segmentation software. MATERIALS AND METHODS: MR images of 45 GBM patients (29 males, 16 females) were downloaded from The Cancer Imaging Archive, in which post-contrast T1-weighted imaging and fluid-attenuated inversion recovery MR sequences were used. Two raters independently segmented the tumors using two semi-automated segmentation tools (TumorPrism3D and 3D Slicer). Regions of interest corresponding to...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Lee M, Woo B, Kuo MD, Jamshidi N, Kim JH Tags: Korean J Radiol Source Type: research

Assessment of Cervical Cancer with a Parameter-Free Intravoxel Incoherent Motion Imaging Algorithm.
Abstract OBJECTIVE: To evaluate the feasibility of a parameter-free intravoxel incoherent motion (IVIM) approach in cervical cancer, to assess the optimal b-value threshold, and to preliminarily examine differences in the derived perfusion and diffusion parameters for different histological cancer types. MATERIALS AND METHODS: After Institutional Review Board approval, 19 female patients (mean age, 54 years; age range, 37-78 years) gave consent and were enrolled in this prospective magnetic resonance imaging study. Clinical staging and biopsy results were obtained. Echo-planar diffusion weighted sequences at ...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Becker AS, Perucho JA, Wurnig MC, Boss A, Ghafoor S, Khong PL, Lee EYP Tags: Korean J Radiol Source Type: research

Effectiveness of Ambulatory Tru-Close Thoracic Vent for the Outpatient Management of Pneumothorax: A Prospective Pilot Study.
CONCLUSION: TV application was a simple, safe, and technically feasible procedure in an outpatient clinic, with an acceptable long-term recurrence-free rate. Thus, TV could be useful for the immediate treatment of pneumothorax. PMID: 28458604 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Kim YP, Haam SJ, Lee S, Lee GD, Joo SM, Yum TJ, Lee KH Tags: Korean J Radiol Source Type: research

Value and Clinical Application of Orthopedic Metal Artifact Reduction Algorithm in CT Scans after Orthopedic Metal Implantation.
Abstract OBJECTIVE: To evaluate orthopedic metal artifact reduction algorithm (O-MAR) in CT orthopedic metal artifact reduction at different tube voltages, identify an appropriate low tube voltage for clinical practice, and investigate its clinical application. MATERIALS AND METHODS: The institutional ethical committee approved all the animal procedures. A stainless-steel plate and four screws were implanted into the femurs of three Japanese white rabbits. Preoperative CT was performed at 120 kVp without O-MAR reconstruction, and postoperative CT was performed at 80-140 kVp with O-MAR. Muscular CT attenuation...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Hu Y, Pan S, Zhao X, Guo W, He M, Guo Q Tags: Korean J Radiol Source Type: research

Value of the Post-Operative CT in Predicting Delayed Flap Failures Following Head and Neck Cancer Surgery.
Abstract OBJECTIVE: To identify post-operative computed tomography (CT) findings associated with delayed flap failures following head and neck cancer surgery. MATERIALS AND METHODS: We retrospectively reviewed 60 patients who underwent flap reconstruction after head and neck cancer surgery and post-operative (3-14 days) contrast-enhanced CT scans for suspected complications. Patients were divided into two groups: delayed flap failure patients (patients required flap revision) (n = 18) and flap success patients (n = 42). Clinical data (age, sex, T-stage, type of flap, and time interval between reconstruction s...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Kim B, Yoon DY, Seo YL, Park MW, Kwon KH, Rho YS, Chung CH Tags: Korean J Radiol Source Type: research

Novel Application of Quantitative Single-Photon Emission Computed Tomography/Computed Tomography to Predict Early Response to Methimazole in Graves' Disease.
Abstract OBJECTIVE: Since Graves' disease (GD) is resistant to antithyroid drugs (ATDs), an accurate quantitative thyroid function measurement is required for the prediction of early responses to ATD. Quantitative parameters derived from the novel technology, single-photon emission computed tomography/computed tomography (SPECT/CT), were investigated for the prediction of achievement of euthyroidism after methimazole (MMI) treatment in GD. MATERIALS AND METHODS: A total of 36 GD patients (10 males, 26 females; mean age, 45.3 ± 13.8 years) were enrolled for this study, from April 2015 to January 2016. T...
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Kim HJ, Bang JI, Kim JY, Moon JH, So Y, Lee WW Tags: Korean J Radiol Source Type: research

RE: Is There a Correlation between the Presence of a Spiculated Mass on Mammogram and Luminal A Subtype Breast Cancer?
PMID: 28458608 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - May 1, 2017 Category: Radiology Authors: Wang RP, Xu L, Zhou S, Wang N, Tang L Tags: Korean J Radiol Source Type: research

Differentiation of the Infarct Core from Ischemic Penumbra within the First 4.5 Hours, Using Diffusion Tensor Imaging-Derived Metrics: A Rat Model.
Abstract OBJECTIVE: To investigate whether the diffusion tensor imaging-derived metrics are capable of differentiating the ischemic penumbra (IP) from the infarct core (IC), and determining stroke onset within the first 4.5 hours. MATERIALS AND METHODS: All procedures were approved by the local animal care committee. Eight of the eleven rats having permanent middle cerebral artery occlusion were included for analyses. Using a 7 tesla magnetic resonance system, the relative cerebral blood flow and apparent diffusion coefficient maps were generated to define IP and IC, half hour after surgery and then every hou...
Source: Korean J Radiol - February 28, 2017 Category: Radiology Authors: Kuo DP, Lu CF, Liou M, Chen YC, Chung HW, Chen CY Tags: Korean J Radiol Source Type: research

No-Touch Radiofrequency Ablation: A Comparison of Switching Bipolar and Switching Monopolar Ablation in Ex Vivo Bovine Liver.
Abstract OBJECTIVE: To evaluate the feasibility, efficiency, and safety of no-touch switching bipolar (SB) and switching monopolar (SM) radiofrequency ablation (RFA) using ex vivo bovine livers. MATERIALS AND METHODS: A pork loin cube was inserted as a tumor mimicker in the bovine liver block; RFA was performed using the no-touch technique in the SM (group A1; 10 minutes, n = 10, group A2; 15 minutes, n = 10) and SB (group B; 10 minutes, n = 10) modes. The groups were compared based on the creation of confluent necrosis with sufficient safety margins, the dimensions, and distance between the electrode and abl...
Source: Korean J Radiol - February 28, 2017 Category: Radiology Authors: Chang W, Lee JM, Lee SM, Han JK Tags: Korean J Radiol Source Type: research