Estimated radiation exposure from medical imaging for patients of radiology service of Al Faraby Hospital, Oujda Morocco
Purpose: To evaluate the effective dose received per radiological examination per patient and the additional cancer risk factor in the Radiological Service of Al Faraby Hospital in 2012.
Methods: From the number of radiological procedures (NX) made in 2012 in the radiology service of Al Faraby Hospital and the average effective dose DEX associated with each type of act exam X, it is possible to calculate the effective dose collective [S =∑ DEX * NX]. The additional cancer risk factor is calculated by the X-ray risk software promoting responsible imaging through patient and provider education. It is function of the effective dose received, the age at the time of exam, and gender of patient.
Results: The radiological average effective dose received per act exam is 1 millisievert (mSv), whereas it is 4.45 mSv and 0.21 mSv for the computed tomography (CT) scan and conventional radiological examinations, respectively. As for the average number of acts per patient 2.66, the effective dose is 1.16 mSv and 3.8 mSv for CT scan and conventional radiological examinations, respectively. As for the average effective dose per patient 2.69 mSv, it is 5.16 mSv and 0.81 mSv for CT scan and conventional radiological examinations, respectively. As for the additional cancer risk in 40 years at the time of exam, the average additional cancer risk is equal to 2.17 × 10-4, wheras the risk is 4.17 × 10-4 and 6.54 × 10-5 for CT scan and conventional radiological examinations, respectively.
Conclusion: Medical exposure related to the diagnosis of patients in the radiology service in 2012 can be characterized by: (a) 2.66 Act exams on average per patient diagnosis corresponding to a mean effective dose equal to 2.69 mSv per patient, (b)frequency of conventional radiology and CT scan was 81% and 19%, respectively. These act exams contribute to the collective effective dose by 17% and 83%, respectively, and (c) radiological acts can be divided into three levels of exposures: 0 to 5 mSv, 5 to 10 mSv, and > 5 mSv, and the proportion of each level is 90.12%, 9.84%, and 0.05%, respectively.
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