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. 2010 Jan;34(1):64-9.
doi: 10.1097/RCT.0b013e3181b67163.

Dual-source computed tomographic temporal resolution provides higher image quality than 64-detector temporal resolution at low heart rates

Philip A Araoz  1 , Jacobo Kirsch, Andrew N Primak, Natalie N Braun, Osama Saba, Eric E Williamson, W Scott Harmsen, Jayawant N Mandrekar, Cynthia H McCollough
Affiliations

Dual-source computed tomographic temporal resolution provides higher image quality than 64-detector temporal resolution at low heart rates

Philip A Araoz et al. J Comput Assist Tomogr. 2010 Jan.

Abstract

Objective: To compare coronary image quality at temporal resolutions associated with dual-source computed tomography (DSCT; 83 milliseconds) and 64-detector row scanning (165 milliseconds).

Methods: In 30 patients with a heart rate of less than 70 beats per minute, DSCT coronary angiograms were reconstructed at 83- and 165-millisecond temporal resolutions over different cardiac phases. A blinded observer graded coronary quality.

Results: The typical DSCT temporal resolution (83 milliseconds) showed a significantly greater quality at end-systole for all coronary vessels and at end-diastole for the right coronary and left anterior descending coronary arteries. For all vessels, the end-diastole produced the highest quality for both temporal resolutions.

Conclusions: Imaging at 83 milliseconds creates superior quality at end-systole for all coronary vessels and at end-diastole for the right coronary and left anterior descending coronary arteries. At low heart rates, end-diastole produces the highest quality at both temporal resolutions.

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Figures

FIGURE 1
FIGURE 1
American Heart Association 15 segment model.
FIGURE 2
FIGURE 2
Superior image quality of the 83-millisecond temporal resolution compared with the 165-millisecond temporal resolution in systolic phase. Axial ECG-gated DSCT images reconstructed at 40% of the R-R interval (systole) using the 83-millisecond (A) and 165-millisecond temporal resolutions (B). In this systolic phase, the RCA (arrow) has much better coronary image quality at 83 milliseconds (coronary image quality score, 4) than at 165 milliseconds (coronary image quality score, 0).
FIGURE 3
FIGURE 3
Maximal coronary image quality at 65% reconstruction. Axial DSCT images at the 83-millisecond temporal resolution reconstructed at 35% (A), 50% (B), and 65% (C) of the R-R interval. In the 35% reconstruction, there is severe blurring of the RCA (arrow; coronary image quality score, 0). At 50%, there is minimal streaking and loss of quality of the RCA edges (arrow; coronary image quality score, 3). At 65%, the coronary image quality is maximal, with well-defined RCA edges (arrow; coronary image quality score, 4).
FIGURE 4
FIGURE 4
Right coronary image quality versus cardiac phase.
FIGURE 5
FIGURE 5
Left main coronary image quality versus cardiac phase.
FIGURE 6
FIGURE 6
Left anterior descending coronary artery image quality versus cardiac phase.
FIGURE 7
FIGURE 7
Circumflex coronary image quality versus cardiac phase.
See this image and copyright information in PMC

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