Assessment of Cancer Risks Associated with Patient Organ Doses from Medical Diagnostic Computed Tomography in Bangladesh

Abstract

Along with the high-quality image, the enormous observance of CT in medical diagnosis delivers radiation doses to patients that are alarmingly higher than other modalities. Observance of entrance doses of patients undergoing selected diagnostic CT in Bangladesh, calculations of Effective Dose (ED) to analyze ED distribution and to determine the whole-body effect of exposure were carried out on Alderson Rando male human phantom maintaining IAEA TRS 457 protocols. Entrance doses of different organs were observed using IBA Kermax plus Tino DDP and pocket dosimeters. Corresponding specific ED (by conversion coefficient) and whole-body ED (by tissue weighting factor) were estimated from it. ED CC found in this study has a wide range from 0.30 to 395.00 µSv for Head, 12.75 to 1075.00 µSv for Chest, 7.35 to 2578.80 µSv for abdomen and 2.40 to 3320 µSv for Gonad. EDwhole was calculated and further used to estimate risk factor and incident per population. Cancer risks estimated by risk calculator were found higher for chest and abdomen CT respectively 2.59×10 -2 (1:3854) and 4.45×10 -2 (1:2246) at the age of 25 and due to having double exposure. The results were compared with established international reference dose levels and found below reference dose levels.