Improved image quality at 256-slice coronary CT angiography in patients with a high heart rate and coronary artery disease: comparison with 64-slice CT imaging. (November 2015)

• Record Type: Journal Article
• Authors: Oda, Seitaro; Katahira, Kazuhiro; Utsunomiya, Daisuke; Takaoka, Hiroko; Honda, Keiichi; Noda, Katsuo; Oshima, Shuichi; Yuki, Hideaki; Namimoto, Tomohiro; Yamashita, Yasuyuki
• Is Part Of: Acta radiologica. Volume 56:Number 11(2015 Nov.)
• Page Start: 1308
• Page End: 1314
• Publication Date: 2015-11
• Subjects: Coronary CT angiography -- image quality -- 256-slice CT -- rotation speed -- heart rate -- computed tomography (CT); Radiology, Medical -- Periodicals; Radiography, Medical -- Periodicals; Radiotherapy -- Periodicals; 616.0757
• DOI: 10.1177/0284185114555152
• Languages: English
• ISSNs: 0284-1851

Abstract

Background: The 256-slice computed tomography (CT) scanners with wider detector coverage and faster gantry rotation speed are now available. The performance of scanners that feature a rotation speed of 270 ms at coronary CT angiography (CCTA) has not been evaluated in patients with a higher heart rate. Purpose: To evaluate the image quality of 256-slice CT with faster gantry rotation speed in patients undergoing CCTA. Material and Methods: We enrolled 886 patients; 357(40.3%) underwent study on a 64-slice CT at a rotation speed of 420 ms, the other 529 (59.7%) were examined using a 256-slice CT scanner at 270 ms. Two observers judged the image quality of 2658 imaged coronary arteries on a 4-point scale. Results: The mean image quality score was significantly higher for the 256 - than the 64-slice CT scans (3.94 ± 0.28 vs. 3.73 ± 0.61; P < 0.01). There was no significant difference in the image quality scores between 64 - and 256-slice scans in patients whose heart rate (HR) was <60 bpm. However, in patients whose HR exceeded 60 bpm these scores were significantly higher for 256-slice CT images ( P < 0.01). Conclusion: CCTA performed on the 256-slice CT scanner yielded significantly better image quality in patients with an HR exceeding 60 bpm.