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- Title
Evaluation of an adaptive detector collimation for prospectively ECG-triggered coronary CT angiography with third-generation dual-source CT.
- Authors
Messerli, Michael; Dewes, Patricia; Scholtz, Jan-Erik; Arendt, Christophe; Wildermuth, Simon; Vogl, Thomas J.; Bauer, Ralf W.
- Abstract
<bold>Objectives: </bold>To investigate the impact of an adaptive detector collimation on the dose parameters and accurateness of scan length adaption at prospectively ECG-triggered sequential cardiac CT with a wide-detector third-generation dual-source CT.<bold>Methods: </bold>Ideal scan lengths for human hearts were retrospectively derived from 103 triple-rule-out examinations. These measures were entered into the new scanner operated in prospectively ECG-triggered sequential cardiac scan mode with three different detector settings: (1) adaptive collimation, (2) fixed 64 × 0.6-mm collimation, and (3) fixed 96 × 0.6-mm collimation. Differences in effective scan length and deviation from the ideal scan length and dose parameters (CTDIvol, DLP) were documented.<bold>Results: </bold>The ideal cardiac scan length could be matched by the adaptive collimation in every case while the mean scanned length was longer by 15.4% with the 64 × 0.6 mm and by 27.2% with the fixed 96 × 0.6-mm collimation. While the DLP was almost identical between the adaptive and the 64 × 0.6-mm collimation (83 vs. 89 mGycm at 120 kV), it was 62.7% higher with the 96 × 0.6-mm collimation (135 mGycm), p < 0.001.<bold>Conclusion: </bold>The adaptive detector collimation for prospectively ECG-triggered sequential acquisition allows for adjusting the scan length as accurate as this can only be achieved with a spiral acquisition. This technique allows keeping patient exposure low where patient dose would significantly increase with the traditional step-and-shoot mode.<bold>Key Points: </bold>• Adaptive detector collimation allows keeping patient exposure low in cardiac CT. • With novel detectors the desired scan length can be accurately matched. • Differences in detector settings may cause 62.7% of excessive dose.
- Subjects
COMPUTED tomography; ELECTROCARDIOGRAPHY; ANGIOGRAPHY; MEDICAL radiography; COMPUTER-assisted image analysis (Medicine); CORONARY disease; COMPARATIVE studies; LONGITUDINAL method; RESEARCH methodology; MEDICAL cooperation; RADIATION doses; RESEARCH; EVALUATION research; CORONARY angiography; MULTIDETECTOR computed tomography; DIAGNOSIS
- Publication
European Radiology, 2018, Vol 28, Issue 5, p2143
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-017-5177-1