Kurzfassung

Purpose:
To evaluate differences in subjective and objective image quality and radiation dose in prospective versus retrospective ECG - gated coronary bypass CT angiography.

Methods:
100 patients underwent ECG - gated bypass CT angiography. Patients were divided in two groups by prospective (n = 52) or retrospective (n = 48) ECG - gated coronary bypass CT angiography using a 256 - slice CT scanner.Subjective image quality, quality of bypass contrast and motion artifacts was quantified by a...Purpose:
To evaluate differences in subjective and objective image quality and radiation dose in prospective versus retrospective ECG - gated coronary bypass CT angiography.

Methods:
100 patients underwent ECG - gated bypass CT angiography. Patients were divided in two groups by prospective (n = 52) or retrospective (n = 48) ECG - gated coronary bypass CT angiography using a 256 - slice CT scanner.Subjective image quality, quality of bypass contrast and motion artifacts was quantified by a scoring system. Furthermore image noise, contrast-to-noise-ratio (CNR), signal-to noise-ratio (SNR) and radiation dose were assessed. All analyses were performed by one experienced interpreter.
Results:
Mean heart rate was 68 bpm (60 / 77 bpm). Median heart rate variability was 5 bpm (3 / 25,75 bpm). Beta - Blockers were administered in 55 of 100 (55 %) patients.Subjective image quality, quality of bypass contrast and motion artifacts was significantly better in the prospective ECG - gated group, while objective parameters of image quality (e.g. CNR and image noise) did not show any significant differences between both groups.Radiation dose was significantly lower in the group who underwent prospective ECG - gated coronary bypass CT angiography.

Conclusion:
Radiation dose reduction up to 70 % can be achieved by using prospective ECG – gating without a negative impact on subjective and objective image quality in MD-CT angiography of coronary bypass grafts.
» weiterlesen» einklappen