نتایج جستجو برای: radiobiological modeling

تعداد نتایج: 390526  

A Mesbahi, B Nasiri Motlagh H Ozan Tekin M Mohammadzadeh N Rasouli

Purpose: In the current study, using different radiobiological models, tumor control probability (TCP) and normal tissue complication probability (NTCP) of radiotherapy plans were calculated for three-dimensional conformal radiation therapy (3D-CRT) and intensity modulated radiation therapy (IMRT) of prostate cancer.Methods and Materials: 10 prostate plans were randomly selected among patients ...

2013
L. Chinsoo Cho Robert Timmerman Brian Kavanagh

There are radiobiological rationales supporting hypofractionated radiotherapy for prostate cancer. The recent advancements in treatment planning and delivery allow sophisticated radiation treatments to take advantage of the differences in radiobiology of prostate cancer and the surrounding normal tissues. The preliminary results from clinical studies indicate that abbreviated fractionation prog...

Journal: :Cancer research 1989
A C Begg E Mooren

An efficient and rapid cytotoxicity assay has been developed, particularly for radiobiological studies, utilizing 96-well microtiter plates. Several days after treatment, cell numbers per well were measured by fluorescent intensity using an automatic reader after staining with the DNA specific dye Hoechst 33258. For radiobiological applications, a microtiter plate irradiation box was designed a...

2016
Aime M. Gloi

Purpose: Stereotactic body radiation therapy (SBRT) has emerged as a standard treatment modality for medically inoperable early-stage lung cancer patients. The aim of this paper is to calculate radiobiological parameters for a sample of 39 patients who underwent lung SBRT. Materials and Methods: For SBRT, a typical regimen of 50 Gy in 4 5 fractions results in local tumor control rates around 99...

2018
Mehrdad Shahmohammadi Beni D Krstic D Nikezic K N Yu

X-ray and γ-ray photons have been widely used for studying radiobiological effects of ionizing radiations. Photons are indirectly ionizing radiations so they need to set in motion electrons (which are a directly ionizing radiation) to perform the ionizations. When the photon dose decreases to below a certain limit, the number of electrons set in motion will become so small that not all cells in...

پایان نامه :0 1391

بیمه گران همیشه بابت خسارات بیمه نامه های تحت پوشش خود نگران بوده و روش هایی را جستجو می کنند که بتوانند داده های خسارات گذشته را با هدف اتخاذ یک تصمیم بهینه مدل بندی نمایند. در این پژوهش توزیع های فیزتایپ در مدل بندی داده های خسارات معرفی شده که شامل استنباط آماری مربوطه و استفاده از الگوریتم em در برآورد پارامترهای توزیع است. در پایان امکان استفاده از این توزیع در مدل بندی داده های گروه بندی ...

2008
MICHAEL HEINRICH SEEGENSCHMIEDT M. H. Seegenschmiedt

M. H. SEEGENSCHMIEDT, MD Professor, Dept. of Radiation Oncology and Therapeutic Radiology, Alfried Krupp Hospital, Alfried Krupp Strafle 21, 45117 Essen, Germany 9.5.3 Radiotherapeutic Management 174 9.5.3.1 Radiobiological Rationale 175 9.5.3.2 Radiotherapy Technique 176 9.5.3.3 Results of Radiotherapy in Morbus Dupuytren I77 9.5.3.4 Possible Risks of Radiotherapy 178 9.5.3.5 Own Clinical Resu...

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