High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Christoph Karlo & Sebastian Leschka & Robert Paul Goetti & Gudrun Feuchtner & Lotus Desbiolles & Paul Stolzmann & Andre Plass & Volkmar Falk & Borut
- چاپ و سال / کشور: 2010
Description
Purpose To compare image quality and radiation dose of high-pitch computed tomography angiography(CTA) of the aortic valve-aortic root complex with and without prospective ECG-gating compared to a retrospectively ECG-gated standard-pitch acquisition. Materials and Methods 120 patients(mean age 68± 13 years) were examined using a 128-slice dual-source CT system using prospectively ECG-gated high-pitch (group A; n=40), non-ECG-gated high-pitch(group B; n= 40) or retrospectively ECG-gated standard-pitch(C; n=40) acquisition techniques. Image quality of the aortic root, valve and ascending aorta including the coronary ostia was assessed by two independent readers. Image noise was measured, radiation dose estimates were calculated. Results Interobserver agreement was good(ê=0.64–0.78). Image quality was diagnostic in 38/40 patients(group A), 37/40(B) and 38/40(C) with no significant difference in number of patients with diagnostic image quality among all groups (p=0.56). Significantly more patients showed excellent image quality in group A compared to groups B and C(each, p<0.01). Average image noise was significantly different between all groups(p<0.05). Mean radiation dose estimates in groups A and B(each; 2.4±0.3 mSv) were significantly lower compared to group C(17.5±4.4 mSv; p<0.01). Conclusion High-pitch dual-source CTA provides diagnostic image quality of the aortic valve-aortic root complex even without ECG-gating at 86% less radiation dose when compared to a standard-pitch ECG-gated acquisition.
Eur Radiol (2011) 21:205–212 DOI 10.1007/s00330-010-1907-3 Received: 17 March 2010 / Revised: 14 June 2010 / Accepted: 19 July 2010 / Published online: 31 July 2010
