Coronary computed tomographic angiography using low-dose prospectively electrocardiographic triggered high-pitch spiral acquisition by dual-source computed tomography: image quality and radiation dose.
- Author:
Yi-ning WANG
1
;
Luo LI
;
Lin-yan KONG
;
Zhi-wei WANG
;
Kang ZHOU
;
Jian CAO
;
Gong-lian FAN
;
Xiao-na ZHANG
;
Zhu-hua ZHANG
;
Zheng-yu JIN
Author Information
- Publication Type:Journal Article
- MeSH: Aged; Bradycardia; diagnostic imaging; Coronary Angiography; methods; Female; Humans; Male; Middle Aged; Quality Control; Radiation Dosage; Radiographic Image Interpretation, Computer-Assisted; Tomography, Spiral Computed; methods
- From: Acta Academiae Medicinae Sinicae 2010;32(6):597-600
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate image quality (IQ) and radiation exposure of coronary computed tomographic angiography (CTA) with prospectively electrocardiographic (ECG) triggered high-pitch spiral acquisition using dual source CT.
METHODSTotally 75 consecutive patients with a stable heart rate (HR) ≤65 bpm underwent coronary CTA. patients were divided into two groups according to their HR (group A HR≤60 bpm, group B HR >60 bpm to≤65 bpm) . A dual-source CT scanner was used (0.6mm collimation, 0.28s rotation time, 80~100 kV, 370 mAs/rot) . Data acquisition was prospectively ECG-triggered at 60% of the R-R interval with a pitch of 3.4. Images were reconstructed with 75ms temporal resolution, 0.75mm slice thickness and 0.5mm increment. IQ was evaluated using a four-point scale (1=excellent, 4=unevaluable) .
RESULTSThe mean HR and scan time of all patients was (57.2 ± 4.8) bpm and (0.42 ± 0.02) s. Of 1103 coronary artery segments, 934 (84.7%) had an IQ score of 1, 135 (12.2%) score of 2, 18 (1.6%) score of 3,and 16 (1.5%) were rated as unevaluable. There was no significant difference between the two groups in IQ [mean score (1.19 ± 0.52 vs. 1.22 ± 0.55;Z=-1.107,P=0.268) . The rate of evaluable segments showed no significant difference between the two groups (98.5% vs. 98.6%;X2=0.000,P=1.000) . Mean dose-length product of all patients was (67.2 ± 30.4) mGy × cm, mean effective dose was (0.94 ± 0.43) mSv.
CONCLUSIONIn patients with a stable HR of 65 bpm or less, prospectively ECG-triggered high-pitch spiral CT acquisition provides high IQ at low radiation dose.
