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Objectives: To investigate the radiation dose received by patients undergoing routine plain x-ray and computed tomography scans for kidney stone studies. Methods: For x-ray scans two sets of experiments were performed. Thermo-Luminescence Dosimeters were used to determine the distribution of radiation dose across the abdominal surface and an acrylic water phantom equipped with a Farmer ionization chamber was used to measure the radiation dose as x-ray photons travel through the abdomen. For CT scans, the Dose Length Product (DLP) over 3 months for abdominal studies was recorded. Calculations were done to convert the DLP to effective dose using k factor values from the International Commission on Radiological Protection (ICRP) report 103. The results were then mapped and analysed using Microsoft excel and Wolfram Mathematical software. Results: Skin dose was greatest at the centre of the abdomen. Radiation equivalent dose to the skin for a plain abdominal x-ray ranged from 2.38mSv for patients with a sthenic body habitus to 5.45mSv for hypersthenic patients. For CT scans, effective dose was found to range between 6.72mSv and 24.27mSv. Conclusion: All radiation dose measured were found to be within recommended ICRP operational limits. The developed procedure could be implemented in other radiology departments in Jamaica as a part of their quality assurance program.

west indian medical journal

Radiation Dose Distribution for Patients Undergoing Routine Radiological Scans for Kidney Stone Diagnosis at the University Hospital of the West Indies