Nevin Manimala Statistics

The impact of body mass index on patient radiation dose in general radiography

J Radiol Prot. 2022 Nov 1. doi: 10.1088/1361-6498/ac9f1f. Online ahead of print.


The aim of the study was to determine the influence of body mass index (BMI) on Dose-Area Product (DAP) and effective dose (ED) in overweight and obese patients. We also wanted to determine the typical dose values as well as suggest adjustments of clinical practice for overweight and obese patients. In this study 597 patients referred for imaging of the chest in PA and lateral projection, lumbar spine AP and lateral projection, imaging of the pelvis, knee in AP and lateral projection, and shoulder in AP projection were considered. For each examination, the image field size, tube voltage, mAs product, source-to-image receptor distance and values of DAP were collected. Based on BMI patients were divided into three groups (normal weight, overweight and obese). At the end, PCXMC 2.0 software was used to calculate the effective dose. The study showed a statistically significant DAP and ED increase in overweight and obese patients by 28.9% up to 275.4% in the case of DAP and an increase of ED from 11.0% to 241.9% in all mentioned examinations except knee and shoulder imaging. Typical DAP values ranged from 2.2 to 54.8 µGym2 for normal weight patients, from 2.2 to 87.6 µGym2 for overweight patients, and from 2.2 to 172.5 µGym2 for obese patients. Spearman’s correlation coefficient showed from very weak to very strong correlations when comparing BMI and DAP as well as comparing BMI and ED. A strong and very strong correlation was found in case of the examinations of the torso (except for the comparison of BMI and ED in case of lateral lumbar spine projection).

PMID:36319605 | DOI:10.1088/1361-6498/ac9f1f

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