320列面検出器CTを用いた前向き心電図同期冠動脈撮影の心拍数別撮影プロトコルにおける被ばくと画質の検討

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The purpose of this study is to estimate radiation dose and image quality of ECG-gated coronary 320-area detector CT (ADCT) angiography which was acquired using the protocols that were considered as optimal methods for different heart rates (HR) in 1031 consecutive patients (M/F=580/451, 65±12 yr) without arrhythmias. We set up 5 protocols for 320-ADCT based on the relationship among heart rates, temporal resolution, gantry rotation speed, optimal reconstruction phase and slow filling phase on 64-multidetector-row computed tomography (MDCT), ie, 1) mid-diastolic (75% of RR) 1 beat scan (MD 1 beat, N=761(73.8%)) for HR≤60, 2) mid-diastolic (75% of RR) 2 beat scan (MD 2 beat, N=135) for 61≤HR≤65, 3) end-systolic and mid-diastolic (37–80% of RR) 2 beat scan (ES-MD 2 beat, N=92) for 66≤HR≤75, 4) end-systolic (R+280–430 ms) 2 beat scan (ES 2 beat, N=21) for 76≤HR≤80, and 5) end-systolic (R+250–400 ms) 3 beat scan (ES 3 beat, N=22) for 81≤HR≤105. Image quality was classified into 3 categories (excellent (3 points), acceptable (2 points), and unacceptable (1 point)). Scanning time, DLP.e and image quality score were 1.4±0.1 s, 220±59 mGy·cm, 3.0±0.2 points in MD 1 beat, 2.2±0.2 s, 434±118 mGy·cm, 2.9±0.3 points in MD 2 beat, 2.1±0.2 s, 729±229 mGy·cm, 2.7±0.5 points in ES-MD 2 beat, 1.9±0.1 s, 432±148 mGy·cm, 2.2±0.6 points in ES 2 beat, and 2.4±0.2 s, 669±152 mGy·cm, 2.3±0.6 points in ES 3 beat respectively. In conclusion, the prospective ECG-gated scan protocol for coronary 320-ADCT angiography in any HR group was considered reasonable and proper for image quality and radiation dose.
公益社団法人日本放射線技術学会の論文
2011-11-20

320列面検出器CTを用いた前向き心電図同期冠動脈撮影の心拍数別撮影プロトコルにおける被ばくと画質の検討

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