نتایج جستجو برای: treatment couch
تعداد نتایج: 1395060 فیلتر نتایج به سال:
Benjamin W. Chaffee, DDS, MPH, PhD; Jing Cheng, MD, MS, Elizabeth T. Couch, RDH, MS; Kristin S. Hoeft, Bonnie Halpern-Felsher, PhD
The American sociologist Carl Couch titled his 1989 paper with a critical question which deserves far more attention than it has to date received. He asked: ‘Oral technologies: a cornerstone of ancient civilizations?’ (1989). Couch went on to write that ‘[i]f only a limited amount of information is available, a highly differentiated society cannot emerge nor be sustained’ (1989, p. 588). In a l...
The purpose of this study is to characterize the dosimetric properties and accuracy of a novel treatment platform (Edge radiosurgery system) for localizing and treating patients with frameless, image-guided stereotactic radiosurgery (SRS) and stereotactic body radiotherapy (SBRT). Initial measurements of various components of the system, such as a comprehensive assessment of the dosimetric prop...
A dataset range of isocenter congruency verification tests have been examined from a statistical perspective for the purpose of establishing tolerance levels that are meaningful, based on the fundamental limitation of linear accelerator isocentricity and the demands of a high-precision stereotactic radiosurgery program. Using a laser-defined isocenter, a total of 149 individual isocenter congru...
PURPOSE Sparing brain volume is the goal when designing plans for multiple brain tumors. We compared dose distributions for tumor and normal tissues using VAMT and static IMRT. METHODS A patient presented with recurrent meningioma with 4 lesions identified. The greatest dimensions for the tumors were 0.4 to 2.0 cm. The tumor sizes and locations can be treated with a single plan with 1.8 Gy/fr...
Noncoplanar fields are normally used to improve the dose conformity of the target while sparing organs at risk. One of the methods to verify the dose distribution from the noncoplanar fields is by comparing their planar dose distributions from the treatment planning system (TPS) and the measured ones; for example, using film or electronic portal imaging devices (EPID). The planar dose distribut...
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