Diagnostic Phase of Calcium Scoring Scan Applied as the Center of Acquisition Window of Coronary Computed Tomography Angiography Improves Image Quality in Minimal Acquisition Window Scan (Target CTA Mode) Using the Second Generation 320-Row CT

Table 5

Objective image quality.

	Group 75%	Group CS	value
Signal-to-noise ratio
Overall	21.5 ± 2.0	21.5 ± 2.1	0.98
RCA	20.6 ± 4.6	13.4 ± 3.1	<0.0001
LAD	21.1 ± 4.3	14.8 ± 2.8	<0.0001
LCX	19.7 ± 3.3	16.1 ± 3.0	0.0038
Contrast-to-noise ratio
Overall	25.2 ± 5.7	23.1 ± 4.0	0.24
RCA	27.5 ± 5.4	40.7 ± 12.5	0.0023
LAD	26.9 ± 7.0	35.6 ± 9.9	0.015
LCX	26.2 ± 6.5	31.4 ± 9.4	0.112

Statistically significant.