نتایج جستجو برای: Dose-volume Histogram

تعداد نتایج: 619461  

Journal: :iranian journal of medical physics 0
hassan ali nedaie radiotherapy oncology department, cancer research center, cancer institute, tehran university of medical sciences, tehran, iran. nooshin banaee young researchers and elites club, science and research branch, islamic azad university, tehran, iran.

introduction intensity-modulated radiotherapy (imrt) is becoming an increasingly routine treatment method. imrt can be delivered by use of conventional multileaf collimators (mlcs) and/or physical compensators. one of the most important factors in selecting an appropriate imrt technique is integral dose. integral dose is equal to the mean energy deposited in the total irradiated volume of the p...

Journal: :iranian journal of radiation research 0
y.j. park department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea w.s. yoon department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea j.a. lee department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea n.k. lee department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea s. lee department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea d.s. yang department of radiation oncology, ansan hospital, korea university medical center, ansan, republic of korea

background: to determine which radiotherapy parameters are associated with the tumor response of locally advanced non-small cell lung cancer (nsclc) patients undergoing concurrent chemoradiotherapy. materials and methods: thirty one patients with iiia/iiib nsclc underwent chemoradiotherapy with a median dose of 63 gy. on our actual treatments, we made radiotherapy planning to cover the planning...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده پزشکی 1391

هدف اصلی رادیوتراپی نابود کردن تمامی سلولهای سرطانی و رساندن کمترین آسیب به بافت های سالم اطراف تومور می باشد. برای رسیدن به هدف فوق می بایست قبل از شروع هر دوره درمانی ابتدا یک درمان مناسب را بر اساس بیشترین احتمال کنترل تومور و کمترین احتمال آسیب بافت های سالم اطراف طراحی کرد که برای انجام چنین فرایندی دانستن روابط دز- پاسخ تمامی ارگان ها الزامی است. یکی از ارگان های بدن که دارای حساسیت پرتوی...

Journal: :iranian journal of radiation research 0
y.l. kim department of radiology, choonhae college of health science, ulsan 689-784, south korea t.s. suh department of radiology, choonhae college of health science, ulsan 689-784, south korea b.y. choe department of radiology, choonhae college of health science, ulsan 689-784, south korea b.o. choi department of radiation oncology, seoul st. mary’s hospital, the catholic university, seoul 137-701, south korea j.b. chung department of radiadion oncology, seoul national university bundang hospital, seongnam 463-707, south korea j.w. lee department of radiation oncology, konkuk university medical center, seoul 143-729, south korea

background: dose calculation algorithms play a very important role in predicting the explicit dose distribution. we evaluated the percent depth dose (pdd), lateral depth dose profile, and surface dose volume histogram in inhomogeneous media using calculation algorithms and inhomogeneity correction methods. materials and methods: the homogeneous and inhomogeneous virtual slab phantoms used in th...

Journal: :Physics in medicine and biology 2015
Johanna Skarpman Munter Jens Sjölund

Knowledge of what dose-volume histograms can be expected for a previously unseen patient could increase consistency and quality in radiotherapy treatment planning. We propose a machine learning method that uses previous treatment plans to predict such dose-volume histograms. The key to the approach is the framing of dose-volume histograms in a probabilistic setting.The training consists of esti...

Journal: :Physics in medicine and biology 2013
M Zarepisheh M Shakourifar G Trigila P S Ghomi S Couzens A Abebe L Noreña W Shang Steve B Jiang Y Zinchenko

The dose-volume histogram (DVH) is a clinically relevant criterion to evaluate the quality of a treatment plan. It is hence desirable to incorporate DVH constraints into treatment plan optimization for intensity modulated radiation therapy. Yet, the direct inclusion of the DVH constraints into a treatment plan optimization model typically leads to great computational difficulties due to the non...

B.M. Park, B.O. Choi, B.Y. Choe, J.B. Chung, J.W. Lee, J.Y. Jung, T.S. Suh, Y.J. Shin, Y.K. Bae, Y.L. Kim,

Background: Dose calculation algorithms play a very important role in predicting the explicit dose distribution. We evaluated the percent depth dose (PDD), lateral depth dose profile, and surface dose volume histogram in inhomogeneous media using calculation algorithms and inhomogeneity correction methods. Materials and Methods: The homogeneous and inhomogeneous virtual slab phantoms used in th...

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