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Korean Journal of Radiology: Official Journal of the Korean Radiological Society

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https://www.readbyqxmd.com/read/29962888/comparison-of-filtered-back-projection-hybrid-iterative-reconstruction-model-based-iterative-reconstruction-and-virtual-monoenergetic-reconstruction-images-at-both-low-and-standard-dose-settings-in-measurement-of-emphysema-volume-and-airway-wall-thickness-a
#1
Cherry Kim, Ki Yeol Lee, Chol Shin, Eun-Young Kang, Yu-Whan Oh, Moin Ha, Chang Sub Ko, Jaehyung Cha
Objective: To evaluate the accuracy of emphysema volume (EV) and airway measurements (AMs) produced by various iterative reconstruction (IR) algorithms and virtual monoenergetic images (VME) at both low- and standard-dose settings. Materials and Methods: Computed tomography (CT) images were obtained on phantom at both low- (30 mAs at 120 kVp) and standard-doses (100 mAs at 120 kVp). Each CT scan was reconstructed using filtered back projection, hybrid IR (iDose4 ; Philips Healthcare), model-based IR (IMR-R1, IMR-ST1, IMR-SP1; Philips Healthcare), and VME at 70 keV (VME70)...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962887/radiological-report-of-pilot-study-for-the-korean-lung-cancer-screening-k-lucas-project-feasibility-of-implementing-lung-imaging-reporting-and-data-system
#2
Ji Won Lee, Hyae Young Kim, Jin Mo Goo, Eun Young Kim, Soo Jung Lee, Tae Jung Kim, Yeol Kim, Juntae Lim
Objective: To report the radiological results of a pilot study for the Korean Lung Cancer Screening project conducted to evaluate the feasibility of lung cancer screening using low-dose chest computed tomography (LDCT) in Korea. Materials and Methods: The National Cancer Center and three regional cancer centers participated in this study. Asymptomatic current or ex-smokers aged 55-74 years with a smoking history of at least 30 pack-years who had used tobacco within the last 15 years were considered eligible...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962886/pulmonary-artery-intimal-sarcoma-versus-pulmonary-artery-thromboembolism-ct-and-clinical-findings
#3
Cherry Kim, Mi Young Kim, Joon-Won Kang, Joon Seon Song, Ki Yeol Lee, Sung-Soo Kim
Objective: To describe CT and clinical findings of pulmonary artery intimal sarcoma (PAIS) compared with those of pulmonary thromboembolism (PTE), to investigate MRI and positron emission tomography (PET)-CT findings of PAIS, and to evaluate the effect of delayed diagnosis of PAIS on survival outcomes. Materials and Methods: Twenty-six patients with PAIS were retrospectively identified and matched for sex, with patients with PTE at a ratio of 1:2. CT and clinical findings of the two groups were compared using Student's t test or chi-square test...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962885/application-of-synthetic-mri-for-direct-measurement-of-magnetic-resonance-relaxation-time-and-tumor-volume-at-multiple-time-points-after-contrast-administration-preliminary-results-in-patients-with-brain-metastasis
#4
Koung Mi Kang, Seung Hong Choi, Moonjung Hwang, Roh-Eul Yoo, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn
Objective: The purpose of this study was to investigate the time-dependent effects of contrast medium on multi-dynamic, multi-echo (MDME) sequence in patients with brain metastases. Materials and Methods: This study included 7 patients with 15 brain metastases who underwent magnetic resonance (MR) examination which included MDME sequences at 1 minute, 10 minutes and 20 minutes after contrast injection. Two volumes of interests, covering an entire tumor (whole tumor) and the enhancing portion of the tumor, were derived from post-contrast synthetic T1-weighted images...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962884/inter-vendor-and-inter-session-reliability-of-diffusion-tensor-imaging-implications-for-multicenter-clinical-imaging-studies
#5
Jeeyoung Min, Mina Park, Jin Woo Choi, Geon-Ho Jahng, Won-Jin Moon
Objective: To evaluate the inter-vendor and inter-session reliability of diffusion tensor imaging (DTI) and relevant parameters. Materials and Methods: This prospective study included 10 healthy subjects (5 women and 5 men; age range, 25-33 years). Each subject was scanned twice using 3T magnetic resonance scanners from three different vendors at two different sites. A voxel-wise statistical analysis of diffusion data was performed using Tract-Based Spatial Statistics...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962883/migraine-with-aura-surface-based-analysis-of-the-cerebral-cortex-with-magnetic-resonance-imaging
#6
Igor Petrusic, Marko Dakovic, Katarina Kacar, Jasna Zidverc-Trajkovic
Objective: Previous migraine studies have reported gray matter alterations in various cortical regions with conflicting results. This study aimed to explore a cortical morphometric difference in migraineurs with aura (MA) compared to healthy subjects (HS) and to delineate a possible difference between the cortical morphological features and different aura phenotypes. Materials and Methods: Forty-eight MA and 30 HS that were balanced by sex, age, and educational level were selected for this study...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962882/evaluation-of-salivary-gland-function-using-diffusion-weighted-magnetic-resonance-imaging-for-follow-up-of-radiation-induced-xerostomia
#7
Yunyan Zhang, Dan Ou, Yajia Gu, Xiayun He, Weijun Peng
Objective: To investigate the value of diffusion-weighted magnetic resonance imaging (DW-MRI) as a noninvasive tool to assess salivary gland function for follow-up of patients with radiation-induced xerostomia. Materials and Methods: This study included 23 patients with nasopharyngeal carcinoma who had been treated with parotid-sparing radiotherapy (RT). Salivary function was assessed by DW-MRI pre-treatment and one week and one year post-RT, respectively. The maximum apparent diffusion coefficient (ADC) of parotid glands (pADCmax) and the time to peak ADC of parotid glands (pTmax) during stimulation were obtained...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962881/ultrasonographic-findings-of-subcutaneous-angioleiomyomas-in-the-extremities-based-on-pathologic-subtypes
#8
Dong Gun Kim, Sun Joo Lee, Hye Jung Choo, Sung Kwan Kim, Jang Gyu Cha, Hee Jin Park, Jong Won Kwon, Tae Eun Kim, Soo-Jin Jung
Objective: The purpose of this study was to describe the ultrasonographic findings of angioleiomyoma based on pathological subtypes. Materials and Methods: Thirty-nine patients with subcutaneous angioleiomyomas in the extremities were retrospectively reviewed by two radiologists and a pathologist. Sonographic images were analyzed to evaluate each tumor's anatomic location, size, shape, margin, heterogeneity, echogenicity, associated findings, and vascularity. Results: Angioleiomyomas were divided into 3 subtypes: capillary (n = 16), venous (n = 22), and cavernous (n = 1)...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962880/secondary-tumors-of-the-urinary-system-an-imaging-conundrum
#9
Ali Devrim Karaosmanoglu, Mehmet Ruhi Onur, Musturay Karcaaltincaba, Deniz Akata, Mustafa Nasuh Ozmen
Imaging features of metastases to the urinary system may closely mimic primary urinary tract tumors, and differential diagnosis by imaging alone may be problematic or even impossible in some cases. The main purpose of this article was to familiarize radiologists with imaging findings of metastasis to the urinary system on cross-sectional imaging, with an emphasis on abdominal and pelvic computed tomography and magnetic resonance imaging. In addition, we review the clinical importance and implications of metastases to the urinary tract and provide information on diagnostic work-ups...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962879/yield-of-repeat-targeted-direct-in-bore-magnetic-resonance-guided-prostate-biopsy-mrgb-of-the-same-lesions-in-men-having-a-prior-negative-targeted-mrgb
#10
Wulphert Venderink, Sjoerd Fm Jenniskens, J P Michiel Sedelaar, Tsutomu Tamada, Jurgen J Fütterer
Objective: This study's purposes were to determine the yield of repeat direct in-bore magnetic resonance-guided prostate biopsy (MRGB) (MRGB-2) after the first one was found to be negative (MRGB-1), to correlate with clinical parameters, and to present the subgroup analyses of patients with positive repeat biopsies, despite having a negative initial biopsies. Materials and Methods: We retrospectively included patients with MRGB-2 after a negative MRGB-1 both between January 2006 and August 2016...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962878/efficacy-efficiency-and-safety-of-magnetic-resonance-guided-high-intensity-focused-ultrasound-for-ablation-of-uterine-fibroids-comparison-with-ultrasound-guided-method
#11
Yi Wang, Zhi-Biao Wang, Yong-Hua Xu
Objective: The purpose of this study was to compare efficacy, sonication energy efficiency, treatment time and safety of magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU) and those of ultrasound-guided high-intensity focused ultrasound (USgHIFU) for ablation of uterine fibroids. Materials and Methods: This study included 43 patients with 44 symptomatic uterine fibroids treated with MRgHIFU and 51 patients with 68 symptomatic uterine fibroids treated with USgHIFU...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962877/association-between-magnetic-resonance-imaging-findings-of-the-pelvic-floor-and-de-novo-stress-urinary-incontinence-after-vaginal-delivery
#12
Na Li, Can Cui, Yue Cheng, Yanhong Wu, Jianzhong Yin, Wen Shen
Objective: The study aimed to evaluate the contributions of levator ani muscle (LAM) injury, vesical neck movement, urethral length and mobility, and urethral sphincter dysfunction observed on magnetic resonance imaging (MRI) towards stress urinary incontinence (SUI) after vaginal delivery. Materials and Methods: Fifty primiparous women after 6 months of delivery (15 with SUI and 35 without) and 35 nulliparous as continent controls underwent MRI at rest and Valsalva maneuver...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962876/comparison-between-three-dimensional-navigator-gated-whole-heart-mri-and-two-dimensional-cine-mri-in-quantifying-ventricular-volumes
#13
Hyun Woo Goo
Objective: To test whether the method utilizing three-dimensional (3D) whole-heart MRI has an additional benefit over that utilizing conventional two-dimensional (2D) cine MRI in quantifying ventricular volumes. Materials and Methods: In 110 patients with congenital heart disease, a navigator-gated, 3D whole-heart MRI during end-systole (ES) and end-diastole (ED), 2D short-axis cine MRI, and phase contrast MRI of the great arteries were acquired. Ventricular volumes were measured by using a 3D threshold-based segmentation for 3D whole-heart MRI and by using a simplified contouring for 2D cine MRI...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962875/is-it-better-to-enter-a-volume-ct-dose-index-value-before-or-after-scan-range-adjustment-for-radiation-dose-optimization-of-pediatric-cardiothoracic-ct-with-tube-current-modulation
#14
Hyun Woo Goo
Objective: To determine whether the body size-adapted volume computed tomography (CT) dose index (CTDvol ) in pediatric cardiothoracic CT with tube current modulation is better to be entered before or after scan range adjustment for radiation dose optimization. Materials and Methods: In 83 patients, cardiothoracic CT with tube current modulation was performed with the body size-adapted CTDIvol entered after (group 1, n = 42) or before (group 2, n = 41) scan range adjustment...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962874/early-prediction-of-response-to-neoadjuvant-chemotherapy-using-dynamic-contrast-enhanced-mri-and-ultrasound-in-breast-cancer
#15
Yunju Kim, Sung Hun Kim, Byung Joo Song, Bong Joo Kang, Kwang-Il Yim, Ahwon Lee, Yoonho Nam
Objective: To determine the diagnostic performance of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and DCE ultrasound (DCE-US) for predicting response to neoadjuvant chemotherapy (NAC) in breast cancer patients. Materials and Methods: This Institutional Review Board-approved prospective study was performed between 2014 and 2016. Thirty-nine women with breast cancer underwent DCE-US and DCE-MRI before the NAC, follow-up DCE-US after the first cycle of NAC, and follow-up DCE-MRI after the second cycle of NAC...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962873/ultrasonographic-echogenicity-and-histopathologic-correlation-of-thyroid-nodules-in-core-needle-biopsy-specimens
#16
Ji-Hoon Kim, Dong Gyu Na, Hunkyung Lee
Objective: To determine the histopathologic features associated with ultrasonographic echogenicity of thyroid nodules. Materials and Methods: This study included 95 nodules of 95 patients (76 women, 19 men; mean age 47.5 ± 12.9 years) with homogeneous echogenicity in which core needle biopsy was performed during a one year period. The nodule echogenicity was categorized into 4 grades (hyperechogenicity, isoechogenicity, mild hypoechogenicity, and marked hypoechogenicity)...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962872/computer-aided-diagnosis-of-thyroid-nodules-via-ultrasonography-initial-clinical-experience
#17
Young Jin Yoo, Eun Ju Ha, Yoon Joo Cho, Hye Lin Kim, Miran Han, So Young Kang
Objective: To prospectively evaluate the diagnostic performance of computer-aided diagnosis (CAD) for detection of thyroid cancers via ultrasonography (US). Materials and Methods: This study included 50 consecutive patients with 117 thyroid nodules on US during the period between June 2016 and July 2016. A radiologist performed US examinations using real-time CAD integrated into a US scanner. We compared the diagnostic performance of radiologist, the CAD system, and the CAD-assisted radiologist for the detection of thyroid cancers...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962871/evaluation-of-modified-core-needle-biopsy-in-the-diagnosis-of-thyroid-nodules
#18
Soomin Ahn, Sejin Jung, Ji-Ye Kim, Jung Hee Shin, Soo Yeon Hahn, Young Lyun Oh
Objective: Core needle biopsy (CNB) of the thyroid is an additional diagnostic method for non-diagnostic or indeterminate cytology samples. We sought to evaluate a new modified core biopsy technique and compare the concordance of its diagnosis with the final diagnosis of the surgically resected specimen. Materials and Methods: A retrospective analysis was conducted on 842 patients who had a thyroid CNB with or without a previous fine-needle aspiration from August 2002 to March 2015; 38% of patients ultimately underwent thyroidectomy...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962870/2017-thyroid-radiofrequency-ablation-guideline-korean-society-of-thyroid-radiology
#19
REVIEW
Ji-Hoon Kim, Jung Hwan Baek, Hyun Kyung Lim, Hye Shin Ahn, Seon Mi Baek, Yoon Jung Choi, Young Jun Choi, Sae Rom Chung, Eun Ju Ha, Soo Yeon Hahn, So Lyung Jung, Dae Sik Kim, Soo Jin Kim, Yeo Koon Kim, Chang Yoon Lee, Jeong Hyun Lee, Kwang Hwi Lee, Young Hen Lee, Jeong Seon Park, Hyesun Park, Jung Hee Shin, Chong Hyun Suh, Jin Yong Sung, Jung Suk Sim, Inyoung Youn, Miyoung Choi, Dong Gyu Na
Thermal ablation using radiofrequency is a new, minimally invasive modality employed as an alternative to surgery in patients with benign thyroid nodules and recurrent thyroid cancers. The Task Force Committee of the Korean Society of Thyroid Radiology (KSThR) developed recommendations for the optimal use of radiofrequency ablation for thyroid tumors in 2012. As new meaningful evidences have accumulated, KSThR decided to revise the guidelines. The revised guideline is based on a comprehensive analysis of the current literature and expert consensus...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29962869/primary-imaging-test-and-appropriate-biopsy-methods-for-thyroid-nodules-guidelines-by-korean-society-of-radiology-and-national-evidence-based-healthcare-collaborating-agency
#20
REVIEW
Eun Ju Ha, Hyun Kyung Lim, Jung Hyun Yoon, Jung Hwan Baek, Kyung Hyun Do, Miyoung Choi, Jin A Choi, Min Lee, Dong Gyu Na
The Korean Society of Radiology and the National Evidence-based Healthcare Collaborating Agency developed guidelines for primary imaging tests and appropriate biopsy methods for thyroid nodules. These guidelines were developed using an adaptation process by collaboration between the development committee and the working group. The development committee, composed of research methodology experts, established the overall plan and provided support about methodological strategies. The working group, composed of radiologist experts in thyroid imaging, wrote the proposals...
July 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
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