این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
International Journal of Radiation Research، جلد ۶، شماره ۳، صفحات ۱۵۱-۱۵۶
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی A new approach to contrast enhancement in MAGICA gel dosimeter image with MRI technique
چکیده انگلیسی مقاله parameters that have to be measured in gel dosimetry. However, the resolution in gel is strongly dependant on gel composition. Selection of optimum method in dose response readout and proper values of parameters can result in noise reduction as well as improvement of contrast, and spatial resolution considerably. Materials and Methods: MAGICA polymer gel dosimeters were manufactured and irradiated to different doses using a 60Co therapy unit. Imaging was performed in a 0.5T MRI with 8 echoes in air and water as a hydrogenous environment. Imaging condition was kept constant, as much as possible, in both imaging modalities. Results: Images obtained from these two procedures were compared quantitatively. R2- dose curves have three different sections, sensitivity obtained in these three sections were 1.039, 1.671, 1.260 Gy-1S-1 and 1.032, 1.729, 1.37 Gy-1S-1 for water and air respectively. Calibration errors were investigated and graphically were compared in two different methods. Conclusion: Imaging in water medium for doses lower than 17 Gy led to a small reduction in spatial resolution was exchanged to a considerable increase of contrast in R2 map. For doses higher than17 Gy, imaging in water or air was preferred depending on the importance of contrast or spatial resolution. Iran. J. Radiat. Res., 2008 6 (3): 151-156
کلیدواژه‌های انگلیسی مقاله Gel dosimeter, MAGICA, resolution, MRI, R2 map.
نویسندگان مقاله سید محمد ابطحی | s m abtahi
shahid beheshti university, nuclear engineering faculty, tehran, iran

سازمان اصلی تایید شده: دانشگاه شهید بهشتی (Shahid beheshti university)

m شهریاری | m. shahriari
shahid beheshti university, nuclear engineering faculty, tehran, iran

سازمان اصلی تایید شده: دانشگاه شهید بهشتی (Shahid beheshti university)

محمدحسین زحمتکش | m h zahmatkesh
novin medical radiation institute, tehran, iran


h خلفی | h. khalafi
nuclear science and technology research institute, tehran, iran


sh شهرام | sh. akhlaghpoor
novin medical radiation institute, tehran, iran


s باقری | s. bagheri
novin medical radiation institute, tehran, iran
نشانی اینترنتی http://www.ijrr.com/browse.php?a_code=A-10-1-293&slc_lang=en&sid=en
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Radiation Biology
نوع مقاله منتشر شده تحقیق بدیع
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات