چکیده

Background: The computed tomography (CT) examinations deliver a relatively high radiation dose to the patient. One of the most crucial factors affecting the dose received by patients is the intensity of tube current. This study aimed to measure the radiation dose of three radiation-sensitive organs in three different modes of tube current modulation (TCM) including constant, longitudinal, and angular modulations in CT scan protocols of the chest and abdomen-pelvis regions of adults. Materials and Methods: CT-scans from the chest and abdomen-pelvis regions of adults in three different current modes were obtained. The absorbed doses of thyroid, lungs, and ovaries were measured using the thermoluminescent dosimeter (TLD) chips embedded in the RANDO phantom. Furthermore, the confirmation of the organ doses was simulated using the Monte Carlo (MC) simulation. The measured doses were evaluated and confirmed by comparison with the simulated doses. Results: The relative differences between the simulated doses and the measured doses at the constant current mode for thyroid, lungs, and ovaries are -4.7%, -1.3%, and -11.7%, respectively. In the longitudinal current modulation mode, the relative differences for thyroid, lungs, and ovaries are -2.2%, -11.2%, and -6.3%, respectively. In the angular modulation mode for thyroid, lungs, and ovaries, the relative differences are 0, -14.6%, and -9.9%, respectively. There is no statistically significant difference between the measured and simulated doses for tube constant mode and TCM. Conclusion: TCM resulted in dose reduction in both measured and simulated doses. The TCM reduces organ dose, which is more evident in the longitudinal modulation

کليدواژه ها

Computed tomography, Tube current modulation, Organ dose, Thermoluminsent dosimeter, Monte Carlo simulation.

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سعید دیلمی , 1400 , تخمین دوز اندام در توموگرافی کامپیوتری با استفاده از مدولاسیون جریان تیوب: شبیه سازی مونت کارلو , ششمین کنفرانس(مجازی) سنجش و ایمنی پرتوهای یونساز و غیر یونساز