M . Benamar et al .: Radioprotection 2024 , 59 ( 2 ), 117 – 122 119
Table 2 . Comparison of the 75 th percentile values of the dosimetric indicators .
75 th percentile all Hospitals
75 th percentile ( Benamar et al ., 2023 )
75 th percentile ( El Mansouri et al . 2022 )
France ( IRSN 2023 ) DRL ( 2019 )
75 th percentile ( 2019-2021 )
CTDIvol ( mGy ) |
9.4 |
11.3 |
10.9 |
13 |
9.5 |
13 |
DLP ( mGy . cm ) |
464.65 |
517.1 |
714 |
625 |
475 |
600 |
DRL Australia ( Lee et al ., 2020 )
Table 3 . The mean values for kVp , mAs , CTDIvol ( mGy ) and DLP ( mGy . cm ) for all the abdominopelvic procedures and per Hospital .
Hospital |
N |
kV |
mAs ± SD |
CTDIvol ± SD |
DLPtotal ± SD |
all Hospitals |
287 |
120 |
90.42 ± 28.34 |
7.95 ± 2.28 |
677.25 ± 342.12 |
H1 |
101 |
120 |
99.62 ± 19.17 |
7.68 ± 1.43 |
683.67 ± 284.28 |
H2 |
111 |
120 |
98.56 ± 36.37 |
7.98 ± 3.23 |
591.22 ± 359.85 |
H3 |
75 |
130 |
65.99 ± 15.94 |
8.29 ± 2.01 |
795.93 ± 343.26 |
Table 4 . The mean and range for the effective dose E eff and kidney dose E k for all procedures and per hospital . Hospital E eff ( mSv ) E K ( mSv )
Mean ± SD Range Mean ± SD Range
all Hospitals |
10.29 ± 5.2 |
1.8 – 38.55 |
7.56 ± 4.37 |
0.98 – 74.08 |
H1 |
10.39 ± 4.32 |
2.56 � 27.34 |
7.46 ± 2.7 |
1.24 – 29.78 |
H2 |
8.99 ± 5.47 |
1.8 � 37.26 |
8.71 ± 6.27 |
1.01 – 71.51 |
H3 |
12.09 ± 5.22 |
3.28 � 38.55 |
5.15 ± 2.48 |
1.33 – 22.9 |
Table 5 . Cancer and hereditary risks per abdominopelvic CT procedure and per hospital .
Hospital Cancer Risk per 10 5 procedures CT
Hereditary Risk per 10 6 procedures CT abdominopelvic kidney abdominopelvic kidney
all Hospitals |
56.59 |
41.58 |
20.58 |
15.12 |
H1 |
57.14 |
41.03 |
20.78 |
14.92 |
H2 |
49.44 |
47.90 |
17.98 |
17.42 |
H3 |
66.49 |
28.32 |
24.18 |
10.3 |
For the effective dose ( E eff ) received by the patient during an abdominopelvic CT scan ranges from 8.99 to 12.09 mSv , with a mean value of 10.29 mSv . The renal dose ( E K ) varies between 5.15 and 8.71 mSv , with a mean value of 7.56 mSv ( Tab . 4 ).
The risk of induction of abdominopelvic and kidney cancer ranged from 49.44 to 66.49 and from 28.32 to 47.9 per 10 5 procedures , respectively ( Tab . 5 ). The hereditary risk of abdominopelvic and renal exposure ranged from 17.98 to 21.86 and from 10.3 to 17.42 per 10 6 procedures , respectively .
4 Discussion
In Morocco , recent studies have been conducted to investigate the radiation dose from CT scans during diagnostic radiological examinations . They have emphasized that the establishment of local DRLs is an important step in the control and optimization of patient radiation protection ( Benamar et al ., 2023 ; El Mansouri et al ., 2022 ). In this regard , the Moroccan Agency for Nuclear and Radiological Safety and Security ( AMSSNuR ) is working on establishing DRLs in terms of examination indications , so that professionals can use this tool to optimize their practice .
The purpose of this study was to compare radiation doses received by our adult patients undergoing abdominopelvic CT with other national and international studies . Secondly , the study aims to help fill some gaps in the evaluation of the effective dose and renal dose received by the patient during an abdominopelvic CT examination in Morocco . Additionally , it aims to estimate the biological effects ( cancer risk and hereditary risk ) that may result from such procedures .