• 제목/요약/키워드: Radiology department

검색결과 9,234건 처리시간 0.047초

Low-Tube-Voltage CT Urography Using Low-Concentration-Iodine Contrast Media and Iterative Reconstruction: A Multi-Institutional Randomized Controlled Trial for Comparison with Conventional CT Urography

  • Kim, Sang Youn;Cho, Jeong Yeon;Lee, Joongyub;Hwang, Sung Il;Moon, Min Hoan;Lee, Eun Ju;Hong, Seong Sook;Kim, Chan Kyo;Kim, Kyeong Ah;Park, Sung Bin;Sung, Deuk Jae;Kim, Yongsoo;Kim, You Me;Jung, Sung Il;Rha, Sung Eun;Kim, Dong Won;Lee, Hyun;Shim, Youngsup;Hwang, Inpyeong;Woo, Sungmin;Choi, Hyuck Jae
    • Korean Journal of Radiology
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    • 제19권6호
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    • pp.1119-1129
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    • 2018

  • Objective: To compare the image quality of low-tube-voltage and low-iodine-concentration-contrast-medium (LVLC) computed tomography urography (CTU) with iterative reconstruction (IR) with that of conventional CTU. Materials and Methods: This prospective, multi-institutional, randomized controlled trial was performed at 16 hospitals using CT scanners from various vendors. Patients were randomly assigned to the following groups: 1) the LVLC-CTU (80 kVp and 240 mgI/mL) with IR group and 2) the conventional CTU (120 kVp and 350 mgI/mL) with filtered-back projection group. The overall diagnostic acceptability, sharpness, and noise were assessed. Additionally, the mean attenuation, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and figure of merit (FOM) in the urinary tract were evaluated. Results: The study included 299 patients (LVLC-CTU group: 150 patients; conventional CTU group: 149 patients). The LVLC-CTU group had a significantly lower effective radiation dose ($5.73{\pm}4.04$ vs. $8.43{\pm}4.38mSv$) compared to the conventional CTU group. LVLC-CTU showed at least standard diagnostic acceptability (score ${\geq}3$), but it was non-inferior when compared to conventional CTU. The mean attenuation value, mean SNR, CNR, and FOM in all pre-defined segments of the urinary tract were significantly higher in the LVLC-CTU group than in the conventional CTU group. Conclusion: The diagnostic acceptability and quantitative image quality of LVLC-CTU with IR are not inferior to those of conventional CTU. Additionally, LVLC-CTU with IR is beneficial because both radiation exposure and total iodine load are reduced.

  • https://doi.org/10.3348/kjr.2018.19.6.1119 인용 KSCI

Photon-Counting Detector CT: Key Points Radiologists Should Know

  • Andrea Esquivel;Andrea Ferrero;Achille Mileto;Francis Baffour;Kelly Horst;Prabhakar Shantha Rajiah;Akitoshi Inoue;Shuai Leng;Cynthia McCollough;Joel G. Fletcher
    • Korean Journal of Radiology
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    • 제23권9호
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    • pp.854-865
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    • 2022

  • Photon-counting detector (PCD) CT is a new CT technology utilizing a direct conversion X-ray detector, where incident X-ray photon energies are directly recorded as electronical signals. The design of the photon-counting detector itself facilitates improvements in spatial resolution (via smaller detector pixel design) and iodine signal (via count weighting) while still permitting multi-energy imaging. PCD-CT can eliminate electronic noise and reduce artifacts due to the use of energy thresholds. Improved dose efficiency is important for low dose CT and pediatric imaging. The ultra-high spatial resolution of PCD-CT design permits lower dose scanning for all body regions and is particularly helpful in identifying important imaging findings in thoracic and musculoskeletal CT. Improved iodine signal may be helpful for low contrast tasks in abdominal imaging. Virtual monoenergetic images and material classification will assist with numerous diagnostic tasks in abdominal, musculoskeletal, and cardiovascular imaging. Dual-source PCD-CT permits multi-energy CT images of the heart and coronary arteries at high temporal resolution. In this special review article, we review the clinical benefits of this technology across a wide variety of radiological subspecialties.

  • https://doi.org/10.3348/kjr.2022.0377 인용 PDF

2021 Korean Thyroid Imaging Reporting and Data System and Imaging-Based Management of Thyroid Nodules: Korean Society of Thyroid Radiology Consensus Statement and Recommendations

  • Eun Ju Ha;Sae Rom Chung;Dong Gyu Na;Hye Shin Ahn;Jin Chung;Ji Ye Lee;Jeong Seon Park;Roh-Eul Yoo;Jung Hwan Baek;Sun Mi Baek;Seong Whi Cho;Yoon Jung Choi;Soo Yeon Hahn;So Lyung Jung;Ji-hoon Kim;Seul Kee Kim;Soo Jin Kim;Chang Yoon Lee;Ho Kyu Lee;Jeong Hyun Lee;Young Hen Lee;Hyun Kyung Lim;Jung Hee Shin;Jung Suk Sim;Jin Young Sung;Jung Hyun Yoon;Miyoung Choi
    • Korean Journal of Radiology
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    • 제22권12호
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    • pp.2094-2123
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    • 2021

  • Incidental thyroid nodules are commonly detected on ultrasonography (US). This has contributed to the rapidly rising incidence of low-risk papillary thyroid carcinoma over the last 20 years. The appropriate diagnosis and management of these patients is based on the risk factors related to the patients as well as the thyroid nodules. The Korean Society of Thyroid Radiology (KSThR) published consensus recommendations for US-based management of thyroid nodules in 2011 and revised them in 2016. These guidelines have been used as the standard guidelines in Korea. However, recent advances in the diagnosis and management of thyroid nodules have necessitated the revision of the original recommendations. The task force of the KSThR has revised the Korean Thyroid Imaging Reporting and Data System and recommendations for US lexicon, biopsy criteria, US criteria of extrathyroidal extension, optimal thyroid computed tomography protocol, and US follow-up of thyroid nodules before and after biopsy. The biopsy criteria were revised to reduce unnecessary biopsies for benign nodules while maintaining an appropriate sensitivity for the detection of malignant tumors in small (1-2 cm) thyroid nodules. The goal of these recommendations is to provide the optimal scientific evidence and expert opinion consensus regarding US-based diagnosis and management of thyroid nodules.

  • https://doi.org/10.3348/kjr.2021.0713 인용 PDF