Assessment of Cerebral Circulatory Arrest via CT Angiography and CT Perfusion in Brain Death Confirmation.
Abstract OBJECTIVE: To compare the utility of computed tomography perfusion (CTP) and three different 4-point scoring systems in computed tomography angiography (CTA) in confirming brain death (BD) in patients with and without skull defects. MATERIALS AND METHODS: Ninety-two patients clinically diagnosed as BD using CTA and/or CTP for confirmation were retrospectively reviewed. For the final analysis, 86 patients were included in this study. Images were re-evaluated by three radiologists according to the 4-point scoring systems that consider the vessel opacification on 1) the venous phase for both M4 segments...
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Akdogan AI, Pekcevik Y, Sahin H, Pekcevik R Tags: Korean J Radiol Source Type: research

Comparison of Genetic Profiles and Prognosis of High-Grade Gliomas Using Quantitative and Qualitative MRI Features: A Focus on G3 Gliomas.
Abstract OBJECTIVE: To evaluate the association of MRI features with the major genomic profiles and prognosis of World Health Organization grade III (G3) gliomas compared with those of glioblastomas (GBMs). MATERIALS AND METHODS: We enrolled 76 G3 glioma and 155 GBM patients with pathologically confirmed disease who had pretreatment brain MRI and major genetic information of tumors. Qualitative and quantitative imaging features, including volumetrics and histogram parameters, such as normalized cerebral blood volume (nCBV), cerebral blood flow (nCBF), and apparent diffusion coefficient (nADC) were evaluated. ...
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Hong EK, Choi SH, Shin DJ, Jo SW, Yoo RE, Kang KM, Yun TJ, Kim JH, Sohn CH, Park SH, Won JK, Kim TM, Park CK, Kim IH, Lee ST Tags: Korean J Radiol Source Type: research

Impact of Chronic Lateral Ankle Instability with Lateral Collateral Ligament Injuries on Biochemical Alterations in the Cartilage of the Subtalar and Midtarsal Joints Based on MRI T2 Mapping.
CONCLUSION: CLAI with combined CFL injuries can lead to cartilage degeneration in subtalar and calcaneocuboid joints, while an isolated ATFL injury might not have a significant impact on the cartilage in these joints. PMID: 32932561 [PubMed - as supplied by publisher] (Source: Korean J Radiol)
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Tao H, Hu Y, Lu R, Zhang Y, Xie Y, Chen T, Chen S Tags: Korean J Radiol Source Type: research

The Extent of Late Gadolinium Enhancement Can Predict Adverse Cardiac Outcomes in Patients with Non-Ischemic Cardiomyopathy with Reduced Left Ventricular Ejection Fraction: A Prospective Observational Study.
Abstract OBJECTIVE: The clinical course of an individual patient with heart failure is unpredictable with left ventricle ejection fraction (LVEF) only. We aimed to evaluate the prognostic value of cardiac magnetic resonance (CMR)-derived myocardial fibrosis extent and to determine the cutoff value for event-free survival in patients with non-ischemic cardiomyopathy (NICM) who had severely reduced LVEF. MATERIALS AND METHODS: Our prospective cohort study included 78 NICM patients with significantly reduced LV systolic function (LVEF
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Kim EK, Lee GY, Jang SY, Chang SA, Kim SM, Park SJ, Choi JO, Park SW, Choe YH, Lee SC, Oh JK Tags: Korean J Radiol Source Type: research

Texture Analysis of Three-Dimensional MRI Images May Differentiate Borderline and Malignant Epithelial Ovarian Tumors.
Abstract OBJECTIVE: To explore the value of magnetic resonance imaging (MRI)-based whole tumor texture analysis in differentiating borderline epithelial ovarian tumors (BEOTs) from FIGO stage I/II malignant epithelial ovarian tumors (MEOTs). MATERIALS AND METHODS: A total of 88 patients with histopathologically confirmed ovarian epithelial tumors after surgical resection, including 30 BEOT and 58 MEOT patients, were divided into a training group (n = 62) and a test group (n = 26). The clinical and conventional MRI features were retrospectively reviewed. The texture features of tumors, based on T2-weighted ima...
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Ye R, Weng S, Li Y, Yan C, Chen J, Zhu Y, Wen L Tags: Korean J Radiol Source Type: research

Spectral Computed Tomography: Fundamental Principles and Recent Developments.
Abstract CT is a diagnostic tool with many clinical applications. The CT voxel intensity is related to the magnitude of X-ray attenuation, which is not unique to a given material. Substances with different chemical compositions can be represented by similar voxel intensities, making the classification of different tissue types challenging. Compared to the conventional single-energy CT, spectral CT is an emerging technology offering superior material differentiation, which is achieved using the energy dependence of X-ray attenuation in any material. A specific form of spectral CT is dual-energy imaging, in which an...
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: So A, Nicolaou S Tags: Korean J Radiol Source Type: research

Intravoxel Incoherent Motion Magnetic Resonance Imaging for Assessing Parotid Gland Tumors: Correlation and Comparison with Arterial Spin Labeling Imaging.
Abstract OBJECTIVE: To compare and correlate the findings of intravoxel incoherent motion (IVIM) magnetic resonance (MR) imaging and arterial spin labeling (ASL) imaging in characterizing parotid gland tumors. MATERIALS AND METHODS: We retrospectively reviewed 56 patients with parotid gland tumors evaluated by MR imaging. The true diffusion coefficient (D), pseudo-diffusion coefficient (D*), and fraction of perfusion (f) values of IVIM imaging and tumor-to-parotid gland signal intensity ratio (SIR) on ASL imaging were calculated. Spearman rank correlation coefficient, chi-squared, Mann-Whitney U, and Kruskal-...
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Ma G, Xu XQ, Zhu LN, Jiang JS, Su GY, Hu H, Bu SS, Wu FY Tags: Korean J Radiol Source Type: research

Contrast-Enhanced Spectral Mammography: Importance of the Assessment of Breast Tumor Size.
PMID: 32932566 [PubMed - as supplied by publisher] (Source: Korean J Radiol)
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Nicosia L, Bozzini AC, Latronico A, Cassano E Tags: Korean J Radiol Source Type: research

Letter: Twelve-Month Volume Reduction Ratio Predicts Regrowth and Time to Regrowth in Thyroid Nodules Submitted to Laser Ablation: A 5-Year Follow-Up Retrospective Study.
PMID: 32932567 [PubMed - as supplied by publisher] (Source: Korean J Radiol)
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Sim JS Tags: Korean J Radiol Source Type: research

How to Monitor and Manage Nodule Regrowth after Thermal Ablation of Benign Thyroid Nodules.
PMID: 32932568 [PubMed - as supplied by publisher] (Source: Korean J Radiol)
Source: Korean J Radiol - September 10, 2020 Category: Radiology Authors: Park SI, Baek JH Tags: Korean J Radiol Source Type: research

Role of Chest Computed Tomography in Children with Pneumonia Associated with Coronavirus Disease 2019.
PMID: 32524779 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Lee MJ, Goo HW Tags: Korean J Radiol Source Type: research

Radiomics in Breast Imaging from Techniques to Clinical Applications: A Review.
Abstract Recent advances in computer technology have generated a new area of research known as radiomics. Radiomics is defined as the high throughput extraction and analysis of quantitative features from imaging data. Radiomic features provide information on the gray-scale patterns, inter-pixel relationships, as well as shape and spectral properties of radiological images. Moreover, these features can be used to develop computational models that may serve as a tool for personalized diagnosis and treatment guidance. Although radiomics is becoming popular and widely used in oncology, many problems such as overfittin...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Lee SH, Park H, Ko ES Tags: Korean J Radiol Source Type: research

Normal and Abnormal Postoperative Imaging Findings after Gastric Oncologic and Bariatric Surgery.
Abstract Surgical resection remains the primary choice of treatment and the only potentially curative option for gastric carcinoma, and is increasingly performed laparoscopically. Gastric resection represents a challenging procedure, with a significant morbidity and non-negligible postoperative mortality. The interpretation of imaging after gastric surgery can be challenging due to significant modifications of the normal anatomy. After the surgery, the familiarity with expected imaging appearances is crucial for diagnosis and appropriate management of potentially life-threatening complications in patients who unde...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Shin CI, Kim SH Tags: Korean J Radiol Source Type: research

MRI Assessment of Complete Response to Preoperative Chemoradiation Therapy for Rectal Cancer: 2020 Guide for Practice from the Korean Society of Abdominal Radiology.
CONCLUSION: This systematic review and meta-analysis provide an evidence-based practical guide for MRI assessment of complete tumor response after CRT for rectal cancer. PMID: 32524782 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Park SH, Cho SH, Choi SH, Jang JK, Kim MJ, Kim SH, Lim JS, Moon SK, Park JH, Seo N, Korean Society of Abdominal Radiology Study Group for Rectal Cancer Tags: Korean J Radiol Source Type: research

Prognostic Value of Restaging F-18 Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography to Predict 3-Year Post-Recurrence Survival in Patients with Recurrent Gastric Cancer after Curative Resection.
Abstract OBJECTIVE: The aim of this study was to investigate the prognostic value of the maximum standardized uptake value (SUVmax) measured while restaging with F-18 fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) to predict the 3-year post-recurrence survival (PRS) in patients with recurrent gastric cancer after curative surgical resection. MATERIALS AND METHODS: In total, 47 patients with recurrent gastric cancer after curative resection who underwent restaging with 18F-FDG PET/CT were included. For the semiquantitative analysis, SUVmax was measured over the visually ...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Kim SH, Song BI, Kim HW, Won KS, Son YG, Ryu SW Tags: Korean J Radiol Source Type: research

Application of Dual-Energy Spectral Computed Tomography to Thoracic Oncology Imaging.
Abstract Computed tomography (CT) is an important imaging modality in evaluating thoracic malignancies. The clinical utility of dual-energy spectral computed tomography (DESCT) has recently been realized. DESCT allows for virtual monoenergetic or monochromatic imaging, virtual non-contrast or unenhanced imaging, iodine concentration measurement, and effective atomic number (Zeff map). The application of information gained using this technique in the field of thoracic oncology is important, and therefore many studies have been conducted to explore the use of DESCT in the evaluation and management of thoracic malign...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Kim C, Kim W, Park SJ, Lee YH, Hwang SH, Yong HS, Oh YW, Kang EY, Lee KY Tags: Korean J Radiol Source Type: research

Infection Control and Management Strategy for COVID-19 in the Radiology Department: Focusing on Experiences from China.
This article outlines our experience in the emergency management procedure and infection control of the radiology department during the COVID-19 outbreak. PMID: 32524785 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Chen Q, Zu ZY, Jiang MD, Lu L, Lu GM, Zhang LJ Tags: Korean J Radiol Source Type: research

CT Quantitative Analysis and Its Relationship with Clinical Features for Assessing the Severity of Patients with COVID-19.
Abstract OBJECTIVE: To investigate the value of initial CT quantitative analysis of ground-glass opacity (GGO), consolidation, and total lesion volume and its relationship with clinical features for assessing the severity of coronavirus disease 2019 (COVID-19). MATERIALS AND METHODS: A total of 84 patients with COVID-19 were retrospectively reviewed from January 23, 2020 to February 19, 2020. Patients were divided into two groups: severe group (n = 23) and non-severe group (n = 61). Clinical symptoms, laboratory data, and CT findings on admission were analyzed. CT quantitative parameters, including GGO, conso...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Sun D, Li X, Guo D, Wu L, Chen T, Fang Z, Chen L, Zeng W, Yang R Tags: Korean J Radiol Source Type: research

Automatic Detection and Classification of Rib Fractures on Thoracic CT Using Convolutional Neural Network: Accuracy and Feasibility.
CONCLUSION: Our CNN model for automatic rib fracture detection could assist radiologists in improving diagnostic efficiency, reducing diagnosis time and radiologists' workload. PMID: 32524787 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Zhou QQ, Wang J, Tang W, Hu ZC, Xia ZY, Li XS, Zhang R, Yin X, Zhang B, Zhang H Tags: Korean J Radiol Source Type: research

Quantitative Vertebral Bone Density Seen on Chest CT in Chronic Obstructive Pulmonary Disease Patients: Association with Mortality in the Korean Obstructive Lung Disease Cohort.
Abstract OBJECTIVE: Patients with chronic obstructive pulmonary disease (COPD) are known to be at risk of osteoporosis. The purpose of this study was to evaluate the association between thoracic vertebral bone density measured on chest CT (DThorax) and clinical variables, including survival, in patients with COPD. MATERIALS AND METHODS: A total of 322 patients with COPD were selected from the Korean Obstructive Lung Disease (KOLD) cohort. DThorax was measured by averaging the CT values of three consecutive vertebral bodies at the level of the left main coronary artery with a round region of interest as large ...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Hwang HJ, Lee SM, Seo JB, Kim JE, Choi HY, Kim N, Lee JS, Lee SW, Oh YM Tags: Korean J Radiol Source Type: research

Assessment of a Deep Learning Algorithm for the Detection of Rib Fractures on Whole-Body Trauma Computed Tomography.
CONCLUSION: We found good performance of a deep learning-based prototype algorithm detecting rib fractures on trauma CT on a per-examination level at a low rate of false-positives per case. A potential area for clinical application is its use as a screening tool to avoid false-negative radiology reports. PMID: 32524789 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Weikert T, Noordtzij LA, Bremerich J, Stieltjes B, Parmar V, Cyriac J, Sommer G, Sauter AW Tags: Korean J Radiol Source Type: research

Long-Term Clinical Effects of Carotid Intraplaque Neovascularization in Patients with Coronary Artery Disease.
Abstract OBJECTIVE: To investigate the predictive value of intraplaque neovascularization (IPN) for cardiovascular outcomes. MATERIALS AND METHODS: We evaluated 217 patients with coronary artery disease (CAD) (158 men; mean age, 68 ± 10 years) with a maximal carotid plaque thickness ≥ 1.5 mm for the presence of IPN using contrast-enhanced ultrasonography. We compared patients with (n = 116) and without (n = 101) IPN during the follow-up period and investigated the predictors of major adverse cardiovascular events (MACE), including cardiac death, myocardial infarction, coronary artery revascularizati...
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Chung H, Kim BY, Kim HS, Kim HO, Lee JM, Woo JS, Kim JB, Kim WS, Kim KS, Kim W Tags: Korean J Radiol Source Type: research

Radiological Recurrence Patterns after Bevacizumab Treatment of Recurrent High-Grade Glioma: A Systematic Review and Meta-Analysis.
CONCLUSION: A substantial proportion of high-grade glioma patients show non-local or non-enhancing radiologic patterns of recurrence after bevacizumab treatment, which may provide insight into surrogate endpoints for treatment failure in clinical trials of recurrent high-grade glioma. PMID: 32524791 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Cho SJ, Kim HS, Suh CH, Park JE Tags: Korean J Radiol Source Type: research

Early CT Findings of Coronavirus Disease 2019 (COVID-19) in Asymptomatic Children: A Single-Center Experience.
CONCLUSION: Small patches of ground-glass opacity with subpleural distribution and unilateral lung involvement were common findings on CT scans of pediatric patients in the early stage of the disease. PMID: 32524792 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Lan L, Xu D, Xia C, Wang S, Yu M, Xu H Tags: Korean J Radiol Source Type: research

COVID-19 Carrier or Pneumonia: Positive Real-Time Reverse-Transcriptase Polymerase Chain Reaction but Negative or Positive Chest CT Results.
PMID: 32524793 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Lei P, Fan B, Sun Y Tags: Korean J Radiol Source Type: research

Spontaneous Pneumomediastinum in a Patient with Coronavirus Disease 2019 Pneumonia and the Possible Underlying Mechanism.
PMID: 32524794 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Lei P, Mao J, Wang P Tags: Korean J Radiol Source Type: research

Hemoptysis in COVID-19: Pulmonary Emboli Should be Ruled Out.
PMID: 32524795 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - June 12, 2020 Category: Radiology Authors: Ozaras R, Uraz S Tags: Korean J Radiol Source Type: research

Clinical Implementation of Deep Learning in Thoracic Radiology: Potential Applications and Challenges.
Abstract Chest X-ray radiography and computed tomography, the two mainstay modalities in thoracic radiology, are under active investigation with deep learning technology, which has shown promising performance in various tasks, including detection, classification, segmentation, and image synthesis, outperforming conventional methods and suggesting its potential for clinical implementation. However, the implementation of deep learning in daily clinical practice is in its infancy and facing several challenges, such as its limited ability to explain the output results, uncertain benefits regarding patient outcomes, an...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Hwang EJ, Park CM Tags: Korean J Radiol Source Type: research

Usefulness of CT-Guided Percutaneous Transthoracic Needle Lung Biopsies in Patients with Suspected Pulmonary Infection.
This study aimed to evaluate the clinical benefits and risks of CT-guided percutaneous transthoracic needle lung biopsies (PTNBs) in patients with a suspected pulmonary infection. MATERIALS AND METHODS: This study included 351 CT-guided PTNBs performed in 342 patients (mean age, 58.9 years [range, 17-91 years]) with suspected pulmonary infection from January 2010 to December 2016. The proportion of biopsies that revealed the causative organism for pulmonary infection and that influenced patient's treatment were measured. Multivariate analyses were performed to identify factors associated with PTNB that revealed the ca...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Kim J, Lee KH, Cho JY, Kim J, Shin YJ, Lee KW Tags: Korean J Radiol Source Type: research

Small Solitary Ground-Glass Nodule on CT as an Initial Manifestation of Coronavirus Disease 2019 (COVID-19) Pneumonia.
Abstract The 2019 novel coronavirus (2019-nCoV) outbreak in Wuhan, Hubei Province, China in 2019 led to large numbers of people being infected and developing atypical pneumonia (coronavirus disease 2019, COVID-19). Typical imaging manifestations of patients infected with 2019-nCoV has been reported, but we encountered an atypical radiological manifestation on baseline computed tomography (CT) images in three patients from Wuhan, China infected with the 2019-nCoV. Surprisingly, the only similar CT finding was a solitary sub-centimeter ground-glass nodule adjacent to bronchovascular bundles, which could be easily ov...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Xia T, Li J, Gao J, Xu X Tags: Korean J Radiol Source Type: research

Automated Breast Ultrasound: Interobserver Agreement, Diagnostic Value, and Associated Clinical Factors of Coronal-Plane Image Features.
This study enrolled 457 pathologically confirmed lesions in 387 female (age, 46.4 ± 10.3 years), including 377 masses and 80 non-mass lesions (NMLs). The unique coronal features, including retraction phenomenon, hyper- or hypoechoic rim (continuous or discontinuous), skipping sign, and white wall sign, were defined and recorded. The interobserver agreement on image type and coronal features was evaluated. Furthermore, clinical factors, including the lesion size, distance to the nipple or skin, palpability, and the histological grade were analyzed. RESULTS: Among the 457 lesions, 296 were malignant and 161 were ...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Tang G, An X, Xiang H, Liu L, Li A, Lin X Tags: Korean J Radiol Source Type: research

Ultrafast Dynamic Contrast-Enhanced Breast MRI: Lesion Conspicuity and Size Assessment according to Background Parenchymal Enhancement.
This study included 360 women (median age, 54 years; range, 26-82 years) with 361 who had undergone breast MRI, including both ultrafast and conventional DCE-MRI before surgery, between January and December 2017. Conspicuity was evaluated using a five-point score. Size was measured as the single maximal diameter. The Wilcoxon signed-rank test was used to compare median conspicuity score. To identify factors associated with conspicuity, multivariable logistic regression was performed. Absolute agreement between size at MRI and histopathologic examination was assessed using the intraclass correlation coefficient (ICC). ...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Kim SY, Cho N, Choi Y, Shin SU, Kim ES, Lee SH, Chang JM, Moon WK Tags: Korean J Radiol Source Type: research

Clinical Study on Safety and Efficacy of Microwave Ablation for Primary Hyperparathyroidism.
This study enrolled 67 PHPT patients (22 men, 45 women; mean age, 56.0 ± 16.3 years; range, 18-83 years) from January 2015 to December 2018. The laboratory data, including the serum intact parathyroid hormone (iPTH), calcium, phosphorus, and alkaline phosphatase (ALP) levels, were evaluated before MWA and again 2 hours, 1 day, 7 days, 1 month, 3 months, 6 months, 12 months, 18 months, and 24 months after. RESULTS: Complete ablation was achieved with all 72 hyperplastic parathyroid glands found on the 67 patients enrolled, 64 of whom were treated in one session and 3 were treated over two sessions. The technical...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Wei Y, Peng L, Li Y, Zhao ZL, Yu MA Tags: Korean J Radiol Source Type: research

Predictors of Good Outcomes in Patients with Failed Endovascular Thrombectomy.
Abstract OBJECTIVE: Endovascular thrombectomy (EVT) fails in approximately 20% of anterior circulation large vessel occlusion (AC-LVO). Nonetheless, the factors that affect clinical outcomes of non-recanalized AC-LVO despite EVT are less studied. The purpose of this study was to identify the factors affecting clinical outcomes in non-recanalized AC-LVO patients despite EVT. MATERIALS AND METHODS: This was a retrospective analysis of clinical and imaging data from 136 consecutive patients who demonstrated recanalization failure (modified thrombolysis in cerebral ischemia [mTICI], 0-2a) despite EVT for AC-LVO. ...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Park H, Kim BM, Baek JH, Kim JH, Heo JH, Kim DJ, Nam HS, Kim YD Tags: Korean J Radiol Source Type: research

Role of Chemical Exchange Saturation Transfer and Magnetization Transfer MRI in Detecting Metabolic and Structural Changes of Renal Fibrosis in an Animal Model at 3T.
Abstract OBJECTIVE: To investigate the value of combined chemical exchange saturation transfer (CEST) and conventional magnetization transfer imaging (MT) in detecting metabolic and structural changes of renal fibrosis in rats with unilateral ureteral obstruction (UUO) at 3T MRI. MATERIALS AND METHODS: Thirty-five Sprague-Dawley rats underwent UUO surgery (n = 25) or sham surgery (n = 10). The obstructed and contralateral kidneys were evaluated on days 1, 3, 5, and 7 after surgery. After CEST and MT examinations, 18F-labeled fluoro-2-deoxyglucose positron emission tomography was performed to quantify glucose ...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Li A, Xu C, Liang P, Hu Y, Shen Y, Hu D, Li Z, Kamel IR Tags: Korean J Radiol Source Type: research

Ultrasonographic Indeterminate Lymph Nodes in Preoperative Thyroid Cancer Patients: Malignancy Risk and Ultrasonographic Findings Predictive of Malignancy.
Abstract OBJECTIVE: Proper management of lymph nodes (LNs) with ultrasonographic (US) indeterminate features in thyroid cancer patients remains elusive. We aimed to evaluate the malignancy risk and US findings predictive of malignancy for US indeterminate LNs in preoperative thyroid cancer patients through node-by-node correlation. MATERIALS AND METHODS: A total of 348 LNs in 284 thyroid cancer patients, who underwent fine-needle aspiration or core-needle biopsy between December 2006 and June 2015, were included. We determined the malignancy risks for US probably benign, indeterminate, and suspicious categori...
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Yoo RE, Kim JH, Bae JM, Hwang I, Kang KM, Yun TJ, Choi SH, Sohn CH, Rhim JH, Park SW Tags: Korean J Radiol Source Type: research

Thyroid Nodules with Isolated Macrocalcifications: Malignancy Risk of Isolated Macrocalcifications and Postoperative Risk Stratification of Malignant Tumors Manifesting as Isolated Macrocalcifications.
CONCLUSION: The US pattern of isolated macrocalcifications (≥ 1 cm) showed an intermediate malignancy risk (at least 18.4%). All malignant tumors were PTCs, and most showed an aggressive behavior and a high or intermediate postoperative ATA risk. PMID: 32323506 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Gwon HY, Na DG, Noh BJ, Paik W, Yoon SJ, Choi SJ, Shin DR Tags: Korean J Radiol Source Type: research

Spontaneous Pneumomediastinum: A Probable Unusual Complication of Coronavirus Disease 2019 (COVID-19) Pneumonia.
PMID: 32323507 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - April 24, 2020 Category: Radiology Authors: Wang J, Su X, Zhang T, Zheng C Tags: Korean J Radiol Source Type: research

Radiomics and Deep Learning: Hepatic Applications.
Abstract Radiomics and deep learning have recently gained attention in the imaging assessment of various liver diseases. Recent research has demonstrated the potential utility of radiomics and deep learning in staging liver fibroses, detecting portal hypertension, characterizing focal hepatic lesions, prognosticating malignant hepatic tumors, and segmenting the liver and liver tumors. In this review, we outline the basic technical aspects of radiomics and deep learning and summarize recent investigations of the application of these techniques in liver disease. PMID: 32193887 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Park HJ, Park B, Lee SS Tags: Korean J Radiol Source Type: research

Preoperative Prediction for Early Recurrence Can Be as Accurate as Postoperative Assessment in Single Hepatocellular Carcinoma Patients.
CONCLUSION: Risk stratification solely based on preoperative imaging and laboratory factors was not inferior to that based on postoperative histopathologic risk factors in predicting early recurrence after curative resection in within Milan criteria single HCC patients. PMID: 32193888 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Cha DI, Jang KM, Kim SH, Kim YK, Kim H, Ahn SH Tags: Korean J Radiol Source Type: research

Development and Validation of a Simple Index Based on Non-Enhanced CT and Clinical Factors for Prediction of Non-Alcoholic Fatty Liver Disease.
Abstract OBJECTIVE: A widely applicable, non-invasive screening method for non-alcoholic fatty liver disease (NAFLD) is needed. We aimed to develop and validate an index combining computed tomography (CT) and routine clinical data for screening for NAFLD in a large cohort of adults with pathologically proven NAFLD. MATERIALS AND METHODS: This retrospective study included 2218 living liver donors who had undergone liver biopsy and CT within a span of 3 days. Donors were randomized 2:1 into development and test cohorts. CTL-S was measured by subtracting splenic attenuation from hepatic attenuation on non-enhanc...
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Ahn Y, Yun SC, Lee SS, Son JH, Jo S, Byun J, Sung YS, Kim HS, Yu ES Tags: Korean J Radiol Source Type: research

Guidelines for Transrectal Ultrasonography-Guided Prostate Biopsy: Korean Society of Urogenital Radiology Consensus Statement for Patient Preparation, Standard Technique, and Biopsy-Related Pain Management.
Abstract The Korean Society of Urogenital Radiology (KSUR) aimed to present a consensus statement for patient preparation, standard technique, and pain management in relation to transrectal ultrasound-guided prostate biopsy (TRUS-Bx) to reduce the variability in TRUS-Bx methodologies and suggest a nationwide guideline. The KSUR guideline development subcommittee constructed questionnaires assessing prebiopsy anticoagulation, the cleansing enema, antimicrobial prophylaxis, local anesthesia methods such as periprostatic neurovascular bundle block (PNB) or intrarectal lidocaine gel application (IRLA), opioid usage, a...
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Lee MS, Moon MH, Kim CK, Park SY, Choi MH, Jung SI, Korean Society of Urogenital Radiology (KSUR) Tags: Korean J Radiol Source Type: research

Comparison of One- and Two-Region of Interest Strain Elastography Measurements in the Differential Diagnosis of Breast Masses.
CONCLUSION: Strain ratios obtained using the 1-ROI method showed higher interobserver agreement without a significant difference in AUC, compared to those obtained using the 2-ROI method. Considering that the 1-ROI method can reduce performers' efforts, it could have an important role in improving the diagnostic performance of breast US by enabling consistent management of breast lesions. PMID: 32193891 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Park HJ, Kim SM, Yun B, Jang M, Kim B, Lee SH, Ahn HS Tags: Korean J Radiol Source Type: research

Contrast-Enhanced Spectral Mammography Versus Ultrasonography: Diagnostic Performance in Symptomatic Patients with Dense Breasts.
CONCLUSION: The diagnostic performances of CESM and US are comparable in symptomatic women with dense breasts; however, the routine use of additional US imaging is questionable for lesions that can be detected by CESM. PMID: 32193892 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Lu Z, Hao C, Pan Y, Mao N, Wang X, Yin X Tags: Korean J Radiol Source Type: research

Cardiac CT for Measurement of Right Ventricular Volume and Function in Comparison with Cardiac MRI: A Meta-Analysis.
Abstract OBJECTIVE: We performed a meta-analysis to evaluate the agreement of cardiac computed tomography (CT) with cardiac magnetic resonance imaging (CMRI) in the assessment of right ventricle (RV) volume and functional parameters. MATERIALS AND METHODS: PubMed, EMBASE, and Cochrane library were systematically searched for studies that compared CT with CMRI as the reference standard for measurement of the following RV parameters: end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), or ejection fraction (EF). Meta-analytic methods were utilized to determine the pooled weighted bias, lim...
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Kim JY, Suh YJ, Han K, Kim YJ, Choi BW Tags: Korean J Radiol Source Type: research

Perceived Dark Rim Artifact in First-Pass Myocardial Perfusion Magnetic Resonance Imaging Due to Visual Illusion.
CONCLUSION: Visual illusion is another potential cause of dark rim artifact in contrast-enhanced myocardial perfusion MRI as demonstrated by illusory rim perceived in the absence of quantitative intensity undershoot. PMID: 32193894 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Shin T, Nayak KS Tags: Korean J Radiol Source Type: research

Optimized Image-Based Surrogate Endpoints in Targeted Therapies for Glioblastoma: A Systematic Review and Meta-Analysis of Phase III Randomized Controlled Trials.
CONCLUSION: Overall, PFS is an optimized IBSE in targeted therapies for glioblastoma; however, 12moPFS is optimal in antiangiogenic therapy. PMID: 32193895 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Suh CH, Kim HS, Jung SC, Choi CG, Kim SJ, Kim KW Tags: Korean J Radiol Source Type: research

Use of Magnetic Resonance Neurography for Evaluating the Distribution and Patterns of Chronic Inflammatory Demyelinating Polyneuropathy.
Abstract OBJECTIVE: To evaluate the distribution and characteristics of peripheral nerve abnormalities in chronic inflammatory demyelinating polyneuropathy (CIDP) using magnetic resonance neurography (MRN) and to examine the diagnostic efficiency. MATERIALS AND METHODS: Thirty-one CIDP patients and 21 controls underwent MR scans. Three-dimensional sampling perfections with application-optimized contrasts using different flip-angle evolutions and T1-/T2- weighted turbo spin-echo sequences were performed for neurography of the brachial and lumbosacral (LS) plexus and cauda equina, respectively. Clinical data an...
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Su X, Kong X, Lu Z, Zhou M, Wang J, Liu X, Kong X, Zhang H, Zheng C Tags: Korean J Radiol Source Type: research

Erratum: Ultrasonographic Demonstration of the Tissue Microvasculature in Children: Microvascular Ultrasonography Versus Conventional Color Doppler Ultrasonography.
Abstract This corrects the article on p. 146 in vol. 21, PMID: 31997590. PMID: 32193897 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Yoo J, Je BK, Choo JY Tags: Korean J Radiol Source Type: research

Erratum: US-Guided Radiofrequency Ablation for Low-Risk Papillary Thyroid Microcarcinoma: Efficacy and Safety in a Large Population.
Abstract This corrects the article on p. 1653 in vol. 20, PMID: 31854153. PMID: 32193898 [PubMed - in process] (Source: Korean J Radiol)
Source: Korean J Radiol - March 21, 2020 Category: Radiology Authors: Lim HK, Cho SJ, Baek JH, Lee KD, Son CW, Son JM, Baek SM Tags: Korean J Radiol Source Type: research