Optimized versus conventional trigger threshold for pancreatic phase image acquisition using dual-energy CT at 40-keV: a randomized controlled trial.

IF 2.3 3区医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Abdominal Radiology Pub Date : 2024-10-21 DOI:10.1007/s00261-024-04637-6

Yoshifumi Noda, Hiromi Koyasu, Avinash Kambadakone, Nobuyuki Kawai, Takuya Naruse, Akio Ito, Tetsuro Kaga, Fuminori Hyodo, Hiroki Kato, Masayuki Matsuo

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引用次数: 0

Abstract

Purpose: To evaluate the impact of optimized trigger threshold on 40-keV pancreatic phase images acquired with a dual-energy CT (DECT) protocol.

Methods: A cohort of 69 consecutive participants (median age, 72 years) undergoing a pancreatic protocol DECT examination between September to December 2021 were prospectively randomized into two protocols: conventional trigger threshold of 100 HU (Group A, n = 34) and optimized trigger threshold of 30 HU (Group B, n = 35). Pancreatic phase image acquisition was performed with fixed delay of 20 s from the trigger threshold. Two radiologists assessed the 40-keV pancreatic phase images for scan timing adequacy using a binary scale (adequate or inadequate). The proportions of these classifications were compared in the two groups using the Fisher's test.

Results: The median times to achieve the aortic attenuation of 30 HU and 100 HU were 16.3 s and 22.3 s in Group A, respectively, and was 17.8 s for 30 HU in Group B. The median time difference from 30 HU to 100 HU was 4.5 s in Group A. The scan timing adequacies of pancreatic phase images were classified as adequate (50.0% and 74.3%) or inadequate (50.0% and 25.7%) in Group A and Group B (P = 0.049).

Conclusion: An optimized trigger threshold of 30 HU allows consistent acquisition of adequate pancreatic phase images compared to the conventional trigger threshold of 100 HU for pancreatic protocol DECT at 40-keV which might lead to improved pancreatic lesion conspicuity.

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使用 40-keV 双能量 CT 采集胰腺相位图像的优化触发阈值与传统触发阈值：随机对照试验。

目的：评估优化触发阈值对双能 CT（DECT）方案获取的 40-keV 胰腺相位图像的影响：将 2021 年 9 月至 12 月期间接受胰腺 DECT 检查的 69 名连续参与者（中位年龄 72 岁）随机分为两组：传统触发阈值 100 HU（A 组，n = 34）和优化触发阈值 30 HU（B 组，n = 35）。胰腺相位图像采集从触发阈值开始固定延迟 20 秒。两名放射科医生使用二元量表（充分或不充分）评估 40-keV 胰腺相位图像的扫描计时充分性。使用费舍尔检验比较两组的分类比例：A 组达到 30 HU 和 100 HU 主动脉衰减的中位时间分别为 16.3 秒和 22.3 秒，B 组达到 30 HU 的中位时间为 17.8 秒；A 组从 30 HU 到 100 HU 的中位时间差为 4.5 秒；A 组和 B 组胰腺相位图像的扫描时间充分性分为充分（50.0% 和 74.3%）和不充分（50.0% 和 25.7%）（P = 0.049）：与 40-keV 下胰腺 DECT 的传统触发阈值 100 HU 相比，优化后的触发阈值为 30 HU，可持续获得足够的胰腺相位图像，这可能会提高胰腺病变的清晰度。

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

Abdominal Radiology Medicine-Radiology, Nuclear Medicine and Imaging

CiteScore

5.20

自引率

8.30%

发文量

334

期刊介绍： Abdominal Radiology seeks to meet the professional needs of the abdominal radiologist by publishing clinically pertinent original, review and practice related articles on the gastrointestinal and genitourinary tracts and abdominal interventional and radiologic procedures. Case reports are generally not accepted unless they are the first report of a new disease or condition, or part of a special solicited section. Reasons to Publish Your Article in Abdominal Radiology: · Official journal of the Society of Abdominal Radiology (SAR) · Published in Cooperation with: European Society of Gastrointestinal and Abdominal Radiology (ESGAR) European Society of Urogenital Radiology (ESUR) Asian Society of Abdominal Radiology (ASAR) · Efficient handling and Expeditious review · Author feedback is provided in a mentoring style · Global readership · Readers can earn CME credits