Size-specific dose estimates: Localizer or transverse abdominal computed tomography images?

Table 1 Number of measurements is illustrated in details

Number of patients	Number of intervals based on scan length + average of intervals, max, min, mid-scan length	Number of diameters (AP, Lat, AP + Lat, √ AP * Lat) on transverse images and localizer	Number of SSDE	Number of calculated SSDE in all patients
4	8 + 4	96	96	384
24	9 + 4	104	104	2496
18	10 + 4	112	112	2016
4	11 + 4	120	120	480
Total = 50				Total = 5376

AP: Anterior-posterior; Lat: Lateral; SSDE: Size specific dose estimate.

Table 2 Difference in diameters (cm) among female and male as well as different weight groups are shown in this table

	AP (transverse images)	Lat (transverse images)	AP (localizer)	Lat (localizer)
Female	25.5 ± 3.6 (18.1-31.3)	37.0 ± 4.5 (29.4-46.9)	27.4 ± 4.6 (19.9-36.1)	39.1 ± 5.6 (27.8-48.0)
Male	28.2 ± 4.0 (23.0-40.9)	37.7 ± 3.9 (30.1-46.2)	30.4 ± 4.9 (22.7-46.2)	40.0 ± 5.4 (29.2-49.8)
P value	< 0.0100	0.2000	< 0.0100	0.2000
< 90 kg	24.4 ± 2.4 (18.1-29.9)	34.4 ± 2.8 (28.8-40.7)	26.0 ± 3.0 (18.1-32.9)	36.0 ± 4.2 (27.8-46.6)
≥ 90 kg	29.7 ± 3.4 (26.0-40.8)	39.6 ± 2.7 (35.7-44.9)	32.3 ± 4.2 (27.0-48.7)	42.4 ± 3.3 (35.5-46.2)
P value	< 0.0001	< 0.0001	< 0.0001	< 0.0001

AP: Anterior-posterior; Lat: Lateral.

Table 3 Size specific dose estimate ratio to computed tomography dose index volume on localizer radiograph and transverse computed tomography images is tabulated on this table

	DAP		DL		DSum		DEff
	Range	Mean	Range	Mean	Range	Mean	Range	Mean
Localizer radiograph
Average	0.20, 0.46	0.06 ± 0.14	-0.17, 0.55	0.12 ± 0.18	-0.26, 0.50	0.04 ± 0.17	-0.25, 0.47	0.04 ± 0.16
Maximum	-0.32, 0.01	-0.21 ± 0.08	-0.13, 0.50	0.08 ± 0.17	-0.28, 0.27	0.01 ± 0.16	-0.30, 0.43	0.00 ± 0.16
Minimum	-0.26, 0.11	-0.11 ± 0.09	-0.17, 0.65	0.26 ± 0.23	-0.27, 0.26	0.03 ± 0.19	-0.27, 0.59	0.04 ± 0.19
Mid location	-0.30, 0.08	-0.15 ± 0.10	-0.17, 0.69	0.13 ± 0.23	-0.22, 0.56	0.16 ± 0.23	-0.20, 0.64	0.12 ± 0.17
Transverse computed tomography images
Average	-0.23, 0.59	0.13 ± 0.14	-0.13, 0.50	0.15 ± 0.16	-0.27, 0.50	0.11 ± 0.15	-0.26, 0.53	0.11 ± 0.15
Maximum	-0.25, 0.67	0.18 ± 0.19	-0.13, 0.50	0.08 ± 0.16	-0.17, 0.59	0.08 ± 0.15	-0.29, 0.53	0.10 ± 0.17
Minimum	-0.16, 0.66	0.13 ± 0.16	-0.06, 0.70	0.31 ± 0.19	-0.20, 0.61	0.11 ± 0.17	-0.14, 0.59	0.16 ± 0.15
Mid location	-0.25, 0.74	-0.10 ± 0.17	-0.17, 0.55	0.19 ± 0.20	-0.12, 0.56	0.16 ± 0.14	-0.19, 0.64	0.10 ± 0.23

D_Eff: Effective Diameter; D_Sum: Sum of anterior-posterior + Lateral diameter; D_L: Lateral diameter; D_AP: Anteroposterior diameter.