نتایج جستجو برای: proton therapy mcnpx
تعداد نتایج: 714209 فیلتر نتایج به سال:
Dose to the total body from induced radiation resulting from primary exposure to radiotherapeutic beams is not detailed in routine treatment planning though this information is potentially important for better estimates of health risks including secondary cancers. This information can also allow better management of patient treatment logistics, suggesting better timing, sequencing, and conduct ...
Proton beam therapy (PBT) is an advanced type of radiotherapy that shows a dosimetric advantage over photon and provides superior dose distribution. PBT may improve patient survival by improving the local disease control while reducing toxicity to normal organs, which result in fewer treatment-related complications. During last decade, technological progress has opened up new possibilities plan...
A new model is presented herein to calculate optimal value for ultra-cold neutron (UCN) production rate of a UCN source. The cold neutron (CN) converter is the main component of UCN source. In this paper, we study the UCN source which contains the D2O neutron moderator, the sD2 converter, 590 Mev proton beam, and the spallation target (a mixture of Pb, D2O and Zr). In order to determine the qua...
abstract background: triple therapy with a proton pump inhibitor, clarithromycin and amoxicillin and quadruple therapy with a proton pump inhibitor, bismuth citrate, metronidazole and amoxicillin have been proposed in maastricht 2000 as the optimal treatment of helicobacter pylori infection. we aimed to compare these two regimens in iranian pediatric patients. methods: a randomized clinical tri...
In the present work, the general purpose radiation transport MCNPX code (version 2.5.0) was used to evaluate the neutron fluence response matrix of the passive Bonner sphere spectrometer recently developed in our laboratory. The calculations were performed for an extended neutron incidence energy range (from 10−9 MeV to 1 GeV). Afterward, a sensitivity analysis of the main parameters affecting ...
In the present work, dose equivalents of radiosensitive organs in head and neck region have been calculated during nasopharynx proton therapy. For this purpose, a middle-size tumor was designed with the use of clinical information, and was then incorporated into the adult male ICRP phantom. According to the medical data, eight radiation paths around the neck were selected. After that, appropria...
Over the past 20 years, several proton beam treatment programs have been implemented throughout the United States. Increasingly, the number of new programs under development is growing. Proton beam therapy has the potential for improving tumor control and survival through dose escalation. It also has potential for reducing harm to normal organs through dose reduction. However, proton beam thera...
PURPOSE To describe the approval process for enrolling patients on NCI-funded cooperative group clinical trials with proton therapy and the impact of data obtained from the process. METHODS Institutions interested in participating in clinical trials with proton therapy must first complete five RPC-coordinated approval steps for each proton delivery Method: a) completion of the proton facility...
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