Ladder-Like Low Iodine Delivery Rate Injection Protocols Based on BMI at 70 KV by Automated Tube Voltage Selection in Coronary CTA

Table 3

Comparison as a whole.

	Experimental group	Control group	T/Z
Aortic root (HU)	523 ± 82	634 ± 87	−11.65	0.001
SD noise (HU)	28 ± 4	32 ± 5	−6.17^a	0.001
Contrast tissue (HU)	123 ± 12	125 ± 15	−1.50	0.136
SNR	18.7 ± 3.5	20.3 ± 4.0	−3.22	0.001
CNR	14.3 ± 3.3	16.3 ± 3.7	−4.43	0.001
Proximal RCA (HU)	473 ± 90	642 ± 101	−16.53	0.001
Mid RCA (HU)	440 ± 98	612 ± 103	−15.09	0.001
Distal RCA (HU)	390 ± 94	581 ± 117	−15.33	0.001
Proximal LAD (HU)	491 ± 84	598 ± 93	−10.25	0.001
Mid LAD (HU)	440 ± 86	556 ± 93	−10.79	0.001
Distal LAD (HU)	363 ± 75	482 ± 94	−8.58^a	0.001
Proximal LCX (HU)	478 ± 83	585 ± 96	−7.86^a	0.001
Distal LCX (HU)	372 ± 80	485 ± 94	−11.07	0.001

a: Calculated using the Wilcoxon rank-sum test.