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International Journal of Radiation Research، جلد ۱۵، شماره ۱، صفحات ۳۹-۴۷
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| عنوان فارسی |
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| چکیده فارسی مقاله |
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| کلیدواژه‌های فارسی مقاله |
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| عنوان انگلیسی |
Accuracy of the dose delivery in prostate cancer patients-using an electronic portal imaging device (EPID) |
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| چکیده انگلیسی مقاله |
Background: To correct patient positioning errors (setup errors) during prostate cancer treatment using EPID and fiducial gold markers, to improve the accuracy of the dose delivery in these patients. Materials and Methods: Fifteen patients with localized prostate carcinoma after implantation of fiducial gold markers in their prostate gland underwent the five-field IMRT planning technique. The plan was prepared in accordance with ICRU 50 guidance (PTV to receive 95-107% dose). The software program reconstructed the three-dimensional position of the markers from the different Beams Eye Views (BEV). The discrepancies of the seeds’ positions (prostate surrogate) between plan and daily images were calculated three dimensionally. Then, necessary corrections were applied to match the prostate fiducial markers in the portal image with the BEV image in the planned one by moving the couch in the X, Y and Z directions. Results: Data from 15 patients and 469 fractions of radiotherapy were analyzed in this study. Two sets of data were available from EPID software before and after 3D set-up corrections. The mean of the population displacement in Left /Right (L/R), Anterior/Posterior (A/P) and Crania/Caudal (C/C) directions were 0.5, -1.0 and 2.4mm before, and -0.1, -0.5 and 0.9mm after corrections, respectively. The systematic and random errors for the measured populations in the three mentioned directions were 2.4, 2.7 and 2mm and 6.4, 5.9 and 6.1mm before corrections, and 1.1, 2.4 and 1.4mm and 3.8, 3.9 and 3.6mm after corrections, correspondingly. Conclusion: This study provides further evidence that using gold markers in the prostate improves dose delivery to the prostate. Also, it has been demonstrated that the EPID can be a powerful tool in the reduction of treatment setup errors and the quality assurance and verification of complex treatments. |
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| کلیدواژه‌های انگلیسی مقاله |
Prostate cancer, EPID, systematic errors, random errors. |
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| نویسندگان مقاله |
سیدرضا مهدوی | s r mahdavi
medical physics department of iran university of medical sciences, tehran, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی ایران (Iran university of medical sciences)
e جزایری قره باغ | e jazayeri gharehbagh
department of radiology and radiotherapy technology, school of allied health sciences, tehran university of medical sciences, tehran, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)
b مفید | b. mofid
3radiotherapy department of shahid beheshti university of medical sciences, tehran, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)
امیرحسین جعفری | a h jafari
research center of biomedical technology and robotics, tehran university of medial sciences, tehran, iran
سازمان اصلی تایید شده: دانشگاه تهران (Tehran university)
علیرضا نیکوفر | a r nikoofar
radiotherapy department of iran university of medical sciences, tehran, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی ایران (Iran university of medical sciences)
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| نشانی اینترنتی |
http://ijrr.com/browse.php?a_code=A-10-1-648&slc_lang=en&sid=en |
| فایل مقاله |
اشکال در دسترسی به فایل - ./files/site1/rds_journals/42/article-42-326533.pdf |
| کد مقاله (doi) |
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| زبان مقاله منتشر شده |
en |
| موضوعات مقاله منتشر شده |
Radiation Biology |
| نوع مقاله منتشر شده |
مرور و بررسی کلی |
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