Table 3.

Data concerning the number of CT scans performed and their irradiation consequences.

Number of CT/patient	6.34 ± 4.12
Low-dose CT/patient	0.5 ± 1
% Low-dose CT/patient	8 ± 18.5
Contrast CT scan/patient	1 ± 2
% Contrast CT scan/patient	17 ± 23
Emergency CT scan/patient	0.5 ± 1
% Emergency CT scan/patient	6.7 ± 31
% Justified emergency CT scan	94.2
Number of routine CT scan	5.6 ± 3.5
% Justification a priori of routine CT scan	57 ± 32
% Justification a posteriori of routine CT scan	60 ± 34
Number of CT scans
1 year	2.6 ± 1.5
3 years	4.5 ± 2.5
On the overall follow-up	6.4 ± 4.1
Number of mean CT scans/patient/year	1.7 ± 0.4
Irradiation CDTI (mGy)/patient
1 year	27.3 ± 20.2
3 years	54.5 ± 64.9
On the overall follow-up	67.8 ± 52.2
Irradiation DLP (mGy*cm)/patient
1 year	897 ± 595
3 years	1582 ± 908
On the overall follow-up	2192 ± 1474
Irradiation in CDTI (mGy)/year	34.9 ± 64.9
Irradiation in DLP (mGy*cm)/year	1095 ± 1971

Computed Tomography Dose Index (CDTI, in mGy), Dose Length Product (DLP, in Gy*cm). All values are expressed with mean ± SD.