Contrast-specific conversion factor for accurate radiation dose estimation in contrast-enhanced abdominal computed tomography.

IF 1.3 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Journal of Clinical Imaging Science Pub Date : 2026-02-16 eCollection Date: 2026-01-01 DOI:10.25259/JCIS_151_2025

Yoshinori Funama, Daisuke Sakabe, Takeshi Nakaura, Seitaro Oda, Masafumi Kidoh, Yasunori Nagayama, Toshinori Hirai

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引用次数: 0

Abstract

Objectives: The objective of the study is to determine the contrast-specific conversion factor (cCF) based on the dose differences between non-enhanced computed tomography (NECT) and contrast-enhanced CT (CECT) in abdominal imaging, with the aim of improving the accuracy of radiation dose estimation in contrast-enhanced examinations.

Material and methods: The study included 33 adult patients who underwent both NECT and CECT. CECT image acquisition commenced 80 s after the start of iodinated contrast medium injection. A Monte Carlo simulation tool was used to estimate the radiation dose delivered to each patient during NECT and CECT. Organ doses for the liver, spleen, and both kidneys were measured using 120-kVp images. The cCF was calculated as the ratio of the organ dose in CECT to that in NECT. The cCF values are dependent on the scan protocol-, CT vendor-, and X-ray photon energy.

Results: The mean organ doses during NECT were 10.45 mGy for the liver, 11.19 mGy for the spleen, and 11.47 mGy for both kidneys. During CECT, these values increased to 15.83 mGy, 17.56 mGy, and 20.75 mGy, respectively. The mean cCFs of CECT relative to NECT were 1.52 for the liver, 1.83 for the spleen, and 1.87 for both kidneys.

Conclusion: Applying the cCF to NECT-based dose estimates enables more accurate assessment of radiation exposure in CECT examinations.

Abstract Image

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对比增强腹部计算机断层扫描准确估计辐射剂量的对比特异转换因子。

目的：本研究的目的是根据非增强CT （NECT）和增强CT （CECT）在腹部成像中的剂量差异确定对比特异性转换因子（cCF），以提高增强检查中辐射剂量估计的准确性。材料和方法：该研究包括33例接受了NECT和CECT的成年患者。碘化造影剂注入后80 s开始CECT图像采集。使用蒙特卡罗模拟工具来估计在NECT和CECT期间给予每位患者的辐射剂量。肝脏、脾脏和双肾的器官剂量使用120 kvp图像测量。cCF计算为CECT中器官剂量与NECT中器官剂量之比。cCF值取决于扫描协议-，CT供应商-和x射线光子能量。结果：NECT期间肝脏、脾脏和双肾的平均器官剂量分别为10.45 mGy、11.19 mGy和11.47 mGy。在CECT期间，这些值分别增加到15.83 mGy， 17.56 mGy和20.75 mGy。CECT相对于NECT的平均cCFs为肝脏1.52，脾脏1.83，双肾1.87。结论：将cCF应用于基于CECT的剂量估计可以更准确地评估CECT检查中的辐射暴露。

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

Journal of Clinical Imaging Science RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

2.00

自引率

0.00%

发文量

期刊介绍： The Journal of Clinical Imaging Science (JCIS) is an open access peer-reviewed journal committed to publishing high-quality articles in the field of Imaging Science. The journal aims to present Imaging Science and relevant clinical information in an understandable and useful format. The journal is owned and published by the Scientific Scholar. Audience Our audience includes Radiologists, Researchers, Clinicians, medical professionals and students. Review process JCIS has a highly rigorous peer-review process that makes sure that manuscripts are scientifically accurate, relevant, novel and important. Authors disclose all conflicts, affiliations and financial associations such that the published content is not biased.