. Author manuscript; available in PMC: 2016 Nov 1.

Published in final edited form as: J Comput Assist Tomogr. 2015 Nov-Dec;39(6):907–913. doi: 10.1097/RCT.0000000000000295

Table 1.

Comparison of PDA CNR and SNR Values by Imaging Series

Variable	Imaging Series	N	Median	Minimum	Maximum
Lesion CNR^a,^b,^c	50 keV	40	4.32	0.54	12.27
	60 keV	40	4.04	0.70	16.01
	70 keV	40	4.06	0.66	15.52
	80 keV	40	3.05	0.46	10.21
	Iodine	40	5.73	0.98	18.15
	120 kVp	38	1.93	0.01	5.57
SNR^a,^b,^d	50 keV	40	8.24	3.11	15.63
	60 keV	40	7.04	1.00	19.16
	70 keV	40	6.93	4.05	24.68
	80 keV	40	5.81	2.51	12.83
	Iodine	40	10.46	4.14	21.36
	120 kVp	38	5.82	2.18	14.95

50, 60, and 70 keV had significantly higher lesion CNR and SNR than 80 keV (p<.0001)

50, 60, 70, and 80 keV had significantly lower lesion CNR and SNR than Iodine (p<.0001)

120 kVp had significantly lower CNR than 50, 60, 70 keV, and Iodine (p<.0001)

120 kVp had significantly lower SNR than 50,70 keV, and Iodine (p<.0001)

P-values incorporate the Bonferroni adjustment for multiple comparisons and the P-values <0.0125 are considered significant after multiple comparison correction