Does Two-Segment Image Reconstruction at 64-Section CT Coronary Angiography Improve Image Quality and Diagnostic Accuracy?

Abstract

At heart rates of more than 65 beats per minute, use of two-segment reconstruction improves image quality at multidetector CT coronary angiography but does not significantly affect overall diagnostic accuracy compared with single-segment reconstruction.

Initial evaluation of coronary images from 320-detector row computed tomography

“…To date, no ''upper bound'' on the acceptable temporal resolution has been established. Motion artifact can also be mitigated by multisegment reconstruction [41,42]. The effective temporal resolution is halved in 2 segment (2R-R) reconstruction; the same CT volume is acquired from two heartbeats to halve the contribution from each.…”

Diagnostic performance of 320-detector CT coronary angiography in patients with atrial fibrillation: preliminary results

“…In the 37 patients, a total of 474 segments was evaluated (81 segments were not included in the analysis because of anatomical variants or were less than 1.5 mm in diameter at their origin). In these 474 segments, image quality was considered as excellent in 162 (34.2%), good in 247 24.5±17.1 (0-60) Z-Axis length (cm) b 14 (12)(13)(14) Data are means±standard deviations. a Data are numbers of patients.…”

“…d ECG recording made during data acquisition cited for reduced image quality in 320-detector CTCA was motion artefact [13]. The motion artefact can be reduced by multi-segment reconstruction [24]. The effective temporal resolution is increased in 2-or 3-segment reconstruction, at the cost of significantly increased patient dose due to the longer radiation exposure.…”

Robustness of end-systolic reconstructions in coronary dual-source CT angiography for high heart rate patients

“…The literature [6,[25][26][27] is conflicting about the potential improvements in image quality from coronary CT angiography associated with the use of multi-versus single-segment reconstruction. Herzog et al [28] found that the improved temporal resolution of two-segment image reconstruction translated into better image quality with 64-section coronary CT angiography at certain heart rates but did not improve overall diagnostic accuracy in a clinical population with a broad diversity of heart rates.…”