Comparison of radiation exposure from dual- and single-energy CT imaging protocols resulting in equivalent contrast-to-noise ratio of lesions for adults and children: a phantom study.

IF 4.7 2区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Nikos Ntoufas, Maria Raissaki, John Damilakis, Kostas Perisinakis
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引用次数: 0

Abstract

Objectives: To compare the radiation exposure from single-energy CT (SECT) against rapid kV-switching dual-energy CT (DECT) imaging in both adults and children when resulting image data offer equivalent lesion identification power.

Materials and methods: Lesions in an adult and a 10-year-old-child body phantom were imitated using iodine solutions of different concentrations. Phantoms were subjected to several SECT and DECT thoracic and abdominal scans using a rapid kV-switching DECT scanner. The contrast-to-noise ratio (CNR) of each lesion was measured on resulting SECT images and virtual monoenergetic images (VMI) available from DECT. The SECT scans that resulted in CNR values similar to the maximum CNR observed in VMIs derived from corresponding DECT scans were identified. SECT and DECT scans with equivalent lesion-discriminating power were compared regarding the associated radiation dose burden. Doses to the lung, breast, and esophagus from thoracic imaging and doses to the liver, kidneys, and stomach from abdominal imaging were determined through Monte Carlo simulations of SECT and DECT exposures.

Results: Compared to SECT imaging of the adult body phantom, organ doses from DECT were found to be 5-11% lower in thoracic imaging and 44-45% lower in abdominal imaging. Compared to SECT imaging of the 10-year-old body phantom, organ doses from DECT were found to be 2.8-3.4 times higher in thoracic imaging and 1.5-1.6 times higher in abdominal imaging.

Conclusion: The use of rapid kV-switching DECT instead of SECT imaging may be associated with a similar or lower dose burden in adults but a noticeably higher dose burden in children.

Key points: Question How does the radiation exposure from single-energy and dual-energy CT imaging compare when both techniques provide equivalent lesion identification power? Findings Rapid kV-switching dual-energy CT compared to single-energy CT may result in a similar or lower radiation dose in adults, but higher radiation dose in children. Clinical relevance Rapid kV-switching dual-energy CT imaging in children should be preferred over single-energy CT imaging only in cases where the additional information provided is crucial for an effective diagnosis.

双能量和单能量CT成像方案的辐射暴露导致成人和儿童病变的等效对比度-噪声比的比较:一项幻象研究。
目的:比较单能量CT (SECT)与快速kv开关双能量CT (DECT)成像在成人和儿童中的辐射暴露,所得图像数据提供相同的病变识别能力。材料和方法:用不同浓度的碘溶液模拟成人和10岁儿童体幻影的病变。使用快速kv切换DECT扫描仪对幻影进行了几次SECT和DECT胸部和腹部扫描。每个病变的对比噪声比(CNR)在得到的断层图像和从DECT获得的虚拟单能图像(VMI)上测量。经节段扫描得出的CNR值与相应DECT扫描得出的VMIs中观察到的最大CNR值相似。在相关的辐射剂量负担方面,比较了具有相同病变鉴别能力的断层扫描和断层扫描。胸部影像学对肺、乳腺和食道的剂量以及腹部影像学对肝脏、肾脏和胃的剂量通过对SECT和DECT照射的蒙特卡罗模拟来确定。结果:与成人体幻影的断层成像相比,DECT在胸部成像中的器官剂量降低5-11%,在腹部成像中的器官剂量降低44-45%。与10岁躯体幻影的断层成像相比,DECT的器官剂量在胸部成像中高出2.8-3.4倍,在腹部成像中高出1.5-1.6倍。结论:使用快速kv转换DECT代替断层成像可能与成人相似或更低的剂量负担有关,但儿童的剂量负担明显更高。当两种技术提供相同的病变识别能力时,单能和双能CT成像的辐射暴露如何比较?结果:与单能CT相比,快速kv开关双能CT对成人的辐射剂量相似或更低,但对儿童的辐射剂量更高。只有在提供的额外信息对有效诊断至关重要的情况下,儿童快速kv转换双能CT成像才应优于单能CT成像。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
European Radiology
European Radiology 医学-核医学
CiteScore
11.60
自引率
8.50%
发文量
874
审稿时长
2-4 weeks
期刊介绍: European Radiology (ER) continuously updates scientific knowledge in radiology by publication of strong original articles and state-of-the-art reviews written by leading radiologists. A well balanced combination of review articles, original papers, short communications from European radiological congresses and information on society matters makes ER an indispensable source for current information in this field. This is the Journal of the European Society of Radiology, and the official journal of a number of societies. From 2004-2008 supplements to European Radiology were published under its companion, European Radiology Supplements, ISSN 1613-3749.
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