S . M . Kabeer et al .: Radioprotection 2024 , 59 ( 3 ), 197 – 202 199
Table 1 . Demography and descriptive analysis of CTDI and DLP of this study . Region mean ± SD Brain Thorax Abd-pelvis Patient characteristics
Acquisition parameter and dose
n |
92 |
30 |
68 |
Age ( y / o ) |
43.3 ± 20.0 |
32.5 ± 12.3 |
45.5 ± 16.8 |
Weight ( kg ) |
65.9 ± 19.1 |
68.4 ± 16.4 |
69.2 ± 16.9 |
Height ( m ) |
1.57 ± 0.19 |
1.605 ± 0.1 |
1.61 ± 0.1 |
BMI ( kg / m 2 ) |
25.6 ± 6.7 |
26.1 ± 7.5 |
26.6 ± 6.4 |
kV |
120 ± 0 |
120 ± 0 |
120 ± 0 |
mAs |
126.6 ± 33.7 |
121.5 ± 47.9 |
118.4 ± 49.7 |
Scan range ( cm ) |
24.61 ± 13.51 |
35.93 ± 9.30 |
82.8 ± 15.2 |
CTDI vol ( mGy ) |
42.7 ± 10.35 |
9.84 ± 2.63 |
13.10 ± 1.99 |
DLP ( mGy . cm ) |
973.2 ± 336.30 |
364.1 ± 107.06 |
681.6 ± 197.1 |
E ( mSv ) |
2.04 ± 0.71 |
5.1 ± 1.5 |
10.22 ± 2.96 |
Table 2 . Statistical analysis on dose and region of examinations .
Region
Brain Thorax Abdomen-pelvis
CTDI vol
DLP CTDI vol DLP CTDI vol DLP
1 st quartile |
45.9 |
857.4 |
8.4 |
349.1 |
11.4 |
519.1 |
Median |
48.2 |
1057.0 |
9.4 |
372.0 |
12.3 |
646.7 |
3 rd quartile |
50.2 |
1156.9 |
12.2 |
436.1 |
14.7 |
786.7 |
Maximum |
51.9 |
1982.2 |
13.1 |
560.8 |
17.0 |
1372.6 |
This comprehensive approach enabled us to make informed interpretations and draw valid inferences regarding our research objectives .
3 Results and discussion
Table 1 tabulate the characteristics of the patients , with 92 brain CT exams , 30 chest CT exams , and 68 abdominalpelvis CT exams . On average , those who had brain CT scans were 43 years old , chest CT scans were 32 years old , and abdominal-pelvis CT scans were 45.5 years old . Additionally , the mean weights for brain , thorax , and abdominal-pelvis CT scans were 65.9 , 68 , and 69 respectively . In addition , the mean BMI was 26.1 for chest CT and 26.6 for abdominal-pelvis CT . Table 2 presents the mean mAs values for all examinations , which varied from 49 to 126 mAs , as well as the kVp values , which were set at 120 for all CT scans . Furthermore , the table displays the average scan range values for each CT scan region , along with the mean CTDI vol , CTDI w , and DLP values , which encompass all 190 cases included in the study .
Table 2 illustrate the distribution of radiation exposure of CT dosimetry in brain , thorax , and abdomen-pelvis regions , which are measured in terms of CTDI vol and DLP . As observed the CTDI vol and DLP values for the brain , thorax , and abdomen-pelvis regions reveals that the radiation exposure in the brain region ranges from 45.9 mGy to 51.9 mGy , with a median CTDI vol of 48.2 mGy and a median DLP of
1057.0 mGy · cm . In comparison , the Thorax region has a narrower spread of CTDI vol values , ranging from 8.4 mGy to 13.1 mGy , and a median CTDI vol of 9.4 mGy and median DLP of 372.0 mGy · cm . It is noteworthy , the abdomen-pelvis region has CTDI vol values between 11.4 mGy and 17.0 mGy , and a median CTDI vol of 12.3 mGy and median DLP of 646.7 mGy · cm , indicating higher radiation exposure compared to the brain and thorax regions .
The median CTDI vol values we identified in our brain CT scan study were found to be similar to the DRLs for brain CTDI vol in Malaysia and Australia . However , these values were notably different from those obtained in other countries , such as the UK , Canada , and the US , also there is a significant difference when compared with the practice in France as tabulated in Table 3 . Japan had the highest CTDI vol value of 77.0 mGy in 2020 , indicating a higher radiation exposure during brain CT scans compared to other regions . The CTDI vol for the United Kingdom was recorded as 60.0 mGy , whereas Australia reported the lowest at 52.0 mGy .
In chest CT scans , Malaysia recorded the highest dose at 19.9 mGy , compared to 15.4 mGy in the United States and 14.1 mGy in Canada . Australia reported the lowest value at 10.0 mGy , while our study reported a CTDI vol of 9.4 mGy . Conversely , there is no substantial difference between the median CTDI vol value for chest CT examinations in our study and the DRLs for chest CT CTDI vol in Australia and the UK . However , when compared to values from other countries such