Image Quality and Patient-Specific Organ Doses in Stone Protocol CT: A Comparison of Traditional CT to Low Dose CT with Iterative Reconstruction

Table 1

Patient demographics and imaging history between modalities.

	FBP-CT (n=250)		IR-CT		p value
			(n=90)
Male gender (%)	133	(53)	45	(50)	p = 0.61
Mean age (range)	53.4 (18-92)		50.2 (19-92)		p = 0.31
BMI (SD)	30.1	(3.2)	30.5 (2.9)		p = 0.73
Race (%)
Caucasian	198	(79)	71	(79)	p = 0.95
African American	37	(15)	10	(11)	p = 0.28
Hispanic	13	(5)	5	(6)	p = 0.89
Asian	1	(1)	1	(1)	p = 0.45
Unknown	1	(1)	3	(3)	p = 0.18
Recent CT (SD)	2.5	(0.5)	1.9	(0.4)	p = 0.15

Key: CT, computed tomography; FBP, filtered back projection; IR, iterative reconstruction; SD, standard deviation.
: “Recent” CT refers to the mean number of abdominal CT scans performed at our institution over the previous five years, excluding the present imaging.