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Congress: ECR25
Poster Number: ESI-25394
Type: EuroSafe Imaging Poster
Authorblock: J. S. D. M. Tapajos, L. L. Tapajos, L. Cavalcante, V. Guttemberg; Manaus/BR
Disclosures:
Juliana Santana De Melo Tapajos: Nothing to disclose
Luciano Leitao Tapajos: Nothing to disclose
Leonardo Cavalcante: Nothing to disclose
Victor Guttemberg: Nothing to disclose
Keywords: Radioprotection / Radiation dose, CT, Physics, Radiation safety, Dosimetric comparison, Quality assurance
Results or findings

525 patients were evaluated, with a mean age of 40.2±13.1 years (range 18 to 95 years), most frequently female (55.4%) and overweight (41.5%).The distribution of patients according to anatomical site/clinical indication was equally 175 individuals (33.3%) for the abdomen, head and chest. Patients undergoing chest CT were older than those undergoing head CT (P<0.001). The height of patients undergoing abdominal CT was greater than the height of patients undergoing head CT (P=0.011). Women more frequently underwent head CT, while men underwent abdominal CT (P<0.001). Other comparisons and associations did not show a statistically significant difference

Table 1: Table 1. Sociodemographic and anthropometric characteristics of patients undergoing computed tomography at each anatomical site, conducted at a medical reference center in Manaus (AM), N=525.
. The tipical values in terms of CTDIvol are: 35.6 mGy,7.4 mGy and 10.2 mGy for head, chest and abdomen, respectively. The tipical values in terms of DLP are 720.0 mGy.cm, 283.0 mGy.cm and 542.0 mGy.cm for the head, chest  and abdomen, respectively. We observed ADs in terms of CTDIvol of 34.3 mGy, 6.4 mGy and 8.7 mGy for head, chest and abdomen exams, respectively, and in DLP with values of 670.0 mGy.cm, 234.0 mGy.cm and 441.0 mGy.cm for head, chest and abdomen, in that order . Radiation doses varied significantly between patients in different BMI groups, being higher in obese patients (P < 0.001)
Table 2: Table 2. AD and DRL, based on CTDIvol and DLP values, for different anatomical sites of patients undergoing computed tomography at a medical reference center in Manaus (AM).
. Among patients undergoing abdominal CT, those who were overweight were the most frequent (42.3%), followed by normal (33.1%), obese (23.4%) and underweight (1.1%). When comparing the median measurements and interquartile ranges of CTDIvol, obese individuals had significantly higher values than those who were overweight, normal or underweight. There was also a difference between those who were overweight in relation to those who were normal (P<0.001).  When comparing the median measurements and interquartile ranges of DLP, obese individuals had significantly higher values than those who were overweight, normal or underweight. There was also a difference between those who were overweight in relation to those who were normal (P<0.001)
Table 3: Table 3. Comparison of medians (P50 or ACHIEVABLE DOSE) and interquartile range lower (P25) and upper limits (P75 or DRL) of CTDIvol and DLP, according to the nutritional status of patients undergoing abdomen computed tomography at a medical reference center in Manaus (AM), N=175.
. Among patients undergoing head CT, those who were overweight were the most frequent (40.6%), followed by obese and normal patients, both with 28.0%, and underweight patients (3.4%). When comparing the median measurements and interquartile ranges of CTDIvol, overweight and obese individuals had significantly higher values than underweight and normal weight individuals (P<0.001)  .When comparing the median measurements and interquartile ranges of DLP, overweight individuals had higher values than underweight individuals (P=0.038)
Table 4: Table 4. Comparison of medians (P50) and interquartile range lower (P25) and upper limits (P75) of CTDIvol and DLP, according to the nutritional status of patients undergoing head computed tomography at a medical reference center in Manaus (AM), N=175.
. Among patients undergoing chest CT, those who were overweight were the most frequent (41.7%), followed by obese (29.7%), normal (27.4%) and underweight (1.1%). Comparing the median measurements and interquartile ranges of CTDIvol, obese individuals had significantly higher values than those who were overweight, normal or underweight. There was also a difference between those who were overweight in relation to those who were normal (P<0.001). When comparing the median measurements and interquartile ranges of DLP, obese individuals had significantly higher values than those who were overweight, normal or underweight. There was also a difference between those who were overweight in relation to those who were normal (P<0.001)
Table 5: Table 5. Comparison of medians (P50) and interquartile range lower (P25) and upper limits (P75) of CTDI and DLP, according to the nutritional status of patients undergoing chest computed tomography at a medical reference center in Manaus (AM), N=175.
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