MeasurementEffective Radiation Dose In of Patient Myocardial Infarct Imaging using Tc-99m – Pyrophosphate

Abstract

This study was conducted at AlnilainDiagnostic Medical Center in Khartoum, 50 patients was investigated for diagnosis of myocardial infractionusing Tc-99m pyrophosphate agent.The administered activity was calculated based on patients weight which ranged between(70-140)Kg for the study sample.The effective dose for each patient was calculated using the equation: Effective dose = sum of [organ doses x tissue weighting factor]. The effective dose (E) to an individual was found by calculating a weighted average of the equivalent dose (H) to different body tissues, with the weighting factors (W) designed to reflect the different radio sensitivities of the tissues: E=∑_i▒〖Hi Wi〗 The data wasanalyzed using statistical program of social studies (SPSS) and Microsoft excel program . Patients weights varied between (70-140Kg) and administered activities werefound to be between (3.75-5.56mCi) depending on the weights of patients and the average effective radiation doses in the case of the two cardiac imaging studies(stress and rest)ware (0.98-4.47mSv)and the average tissue weighting factors ware (14.67-95.44).It was found that the effective radiation dose was directlyproportional to the patient weight.