Effects of oral contrast on dose in abdominopelvic computed tomography with pure iterative reconstruction

Table 1 Comparison of dose-length product and size-specific dose estimated measurements by body mass index range

Group	n	Parameter	PC	NC	P value
1	PC n = 7	DLP (mGy.cm)	40.08 ± 6.42	52.07 ± 12.09	0.355
	NC n = 18	SSDE (mGy)	1.46 ± 0.29	1.58 ± 0.30	0.0211
2	PC n = 15	DLP (mGy.cm)	64.57 ± 9.98	2.03 ± 0.26	0.0021
	NC n = 18	SSDE (mGy)	111.68 ± 34.38	2.56 ± 0.58	< 0.0011
3	PC n = 9	DLP (mGy.cm)	94.75 ± 33.54	145.75 ± 33.54	0.0171
	NC n = 3	SSDE (mGy)	2.79 ± 0.70	2.95 ± 0.57	0.719
4	PC n = 4	DLP (mGy.cm)	224.09 ± 57.69	269.94 ± 111.24	0.951
	NC n = 5	SSDE (mGy)	5.09 ± 0.82	5.04 ± 1.32	0.483

Significant differences are denoted by¹. Group 1: BMI < 20 kg/m²; group 2: BMI 20-25 kg/m²; group 3: BMI 25-30 kg/m²; group 4: BMI > 30 kg/m². DLP: Dose-length product; SSDE: Size-specific dose estimated; BMI: Body mass index; PC: Positive contrast; NC: Negative contrast.