Model-based iterative reconstruction for 320-detector row CT angiography reduces radiation exposure in infants with complex congenital heart disease.

IF 1.7 4区医学 Q2 Medicine

Diagnostic and Interventional Radiology Pub Date : 2021-01-01 DOI:10.5152/dir.2020.19633

Yuzo Yamasaki, Takeshi Kamitani, Koji Sagiyama, Yuko Matsuura, Tomoyuki Hida, Hazumu Nagata

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引用次数: 10

Abstract

Purpose: We investigated the impact of model-based iterative reconstruction (MBIR) on 320-detector row computed tomography angiography (CTA) in infants with complex congenital heart disease (CHD).

Methods: Seventy infants with complex CHD who underwent 320-detector row CTA (40 boys and 30 girls; age range, 0-22 months; median age, 60 days) were retrospectively evaluated. First, the images were reconstructed by filtered back projection (FBP), hybrid iterative reconstruction (HIR), or MBIR in 20 cases, and variables were compared among the three iterative reconstruction methods (IR test). Second, the variables were compared between 25 cases scanned using HIR and 25 cases scanned using MBIR, with a 20 standard deviation noise level for both. Attenuation values and contrast-to-noise ratios (CNRs) of the great vessels and heart chambers were calculated. Total dose-length products were recorded for all patients (radiation dose: RD test).

Results: In the IR test, the mean CNR values were 4.8±1.3 for FBP, 6.9±1.4 for HIR, and 8.2±1.7 for MBIR (P < 0.0001). The best subjective image qualities in the great vessels and heart chambers were obtained with MBIR. In RD testing, no significant differences between HIR and MBIR in image quality (CNR: HIR, 8.4±2.4; MBIR, 8.3±2.4) were observed. The effective dose was significantly lower for MBIR than for HIR (0.7±0.2 vs. 1.1±0.3 mSv; P < 0.001).

Conclusion: The MBIR algorithm significantly improved image quality and decreased radiation exposure in 320-row CTA of infants with complex CHD, providing an alternative to FBP or HIR that is both safer and produces better results.

查看原文本刊更多论文

基于模型的320排CT血管造影迭代重建可减少复杂先天性心脏病患儿的辐射暴露。

目的:研究基于模型的迭代重建(MBIR)对复杂先天性心脏病(CHD)患儿320排ct血管造影(CTA)的影响。方法:70例复杂冠心病患儿行320排CTA检查(男40例，女30例;年龄:0-22个月;中位年龄(60天)回顾性评估。首先，对20例图像分别采用滤波后投影(FBP)、混合迭代重建(HIR)和MBIR进行重建，并对三种迭代重建方法进行变量比较(IR检验)。其次，比较了25例使用HIR扫描的病例和25例使用MBIR扫描的病例的变量，两者的噪声水平均为20个标准差。计算大血管和心腔的衰减值和噪比(CNRs)。记录所有患者的总剂量长度产品(辐射剂量:RD试验)。结果:在IR测试中，FBP的平均CNR值为4.8±1.3,HIR为6.9±1.4,MBIR为8.2±1.7 (P < 0.0001)。MBIR在大血管和心腔内获得了最好的主观图像质量。在RD测试中，HIR与MBIR在图像质量上无显著差异(CNR: HIR, 8.4±2.4;MBIR为8.3±2.4)。MBIR的有效剂量显著低于HIR(0.7±0.2 vs 1.1±0.3 mSv);P < 0.001)。结论:MBIR算法显著提高了婴幼儿复杂冠心病320排CTA的图像质量，降低了辐射暴露，是FBP或HIR之外的一种更安全、效果更好的选择。

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

Diagnostic and Interventional Radiology 医学-核医学

CiteScore

3.50

自引率

4.80%

发文量

审稿时长

6-12 weeks

期刊介绍： Diagnostic and Interventional Radiology (Diagn Interv Radiol) is the open access, online-only official publication of Turkish Society of Radiology. It is published bimonthly and the journal’s publication language is English. The journal is a medium for original articles, reviews, pictorial essays, technical notes related to all fields of diagnostic and interventional radiology.