نوع مقاله : مقاله پژوهشی
نویسندگان
1 پژوهشکده کاربرد پرتوها، پژوهشگاه علوم و فنون هستهای، صندوق پستی: 836-14395، کرج – ایران
2 پژوهشکده رآکتور و ایمنی هستهای، پژوهشگاه علوم و فنون هستهای، صندوق پستی: 836-14395، تهران- ایران
3 گروه فیزیک و مهندسی پزشکی، دانشکده پزشکی، دانشگاه علوم پزشکی شهید بهشتی، صندوق پستی: 6446-14155، تهران- ایران
4 بخش مهندسی هستهای، دانشکده مهندسی مکانیک، دانشگاه شیراز، صندوق پستی: 84334-71946، شیراز - ایران
کلیدواژهها
عنوان مقاله English
نویسندگان English
Cone-Beam CT (CBCT) is well known for its role in dental imaging, diagnosis, and treatment planning, but xrays can be risky. This study aimed to provide an accurate and comprehensive database of organs and size-specific effective doses based on body mass indexes (BMI) of patients in dental-CBCT units. To simulate exposure geometry for three different imaging protocols with GIANO CBCT, one of the commonly used units in Iran, the Monte-Carlo (MC) method was used. The population of Extended-Cardiac Torso(XCAT) adult male and female computational phantoms with various BMIs were used in the simulation as input files. The measured doses from the Rando phantom and thermoluminescence dosimeters were compared with simulated doses based on CT images of the Rando phantom. This was done to validate the simulations. The results showed the organs doses for the different Fields-of-View(FOVs) varied widely, usually in adult females was higher. The maximum size-specific effective doses for temporomandibular-joint (TMJ), single, and both arch protocols were 94±5μSv, 63±4μSv, and 62±2μSv for adult males with BMIs 25.82, 21.70, and 21.71kg m-2, whereas, and 98±3μSv, 69±1 μSv and 66±1μSv for adult females with BMIs 21.69, 21.71 and 21.72kg m-2, respectively. Also, the difference between the minimum and maximum value of effective dose in TMJ, single, and both-arch protocols was 24%, 37%, and 32% for AM. These AF values were 24%, 32%, and 35%, respectively. Eventually, this study provides a comprehensive data set of patient doses for wide ranges of BMIs without experimental measurement.
کلیدواژهها English