نتایج جستجو برای: treatment dose correction
تعداد نتایج: 1752083 فیلتر نتایج به سال:
PURPOSE A recent field safety notice from TomoTherapy detailed the underdosing of small, off-axis targets when receiving high doses per fraction. This is due to angular undersampling in the dose calculation gantry angles. This study evaluates a correction method to reduce the underdosing, to be implemented in the current version (v4.1) of the TomoTherapy treatment planning software. METHODS T...
introduction: the selection of suitable beam angles and weights in external-beam radiotherapy is at present generally based upon the experience of the planner. therefore, automated selection of beam angles and weights in forward-planned radiotherapy will be beneficial. material and methods: in this work, an efficient method is presented within the matlab environment to investigate how to improv...
The concept of hormesis, or low-dose U-shaped responses, is now well established in toxicology and pharmacology but requires development in medicine and therapeutics. In doing so, care must be taken to not confuse metaphorical and chemical uses of the term hormesis. Low dose, continuous adaptive responses are fundamentally different than conventional pharmacology, and they may improve the scien...
BACKGROUND This study investigates the impact of an automated image guided patient setup correction on the dose distribution for ten patients with in-field IMRT re-irradiation of vertebral metastases. METHODS 10 patients with spinal column metastases who had previously been treated with 3D-conformal radiotherapy (3D-CRT) were simulated to have an in-field recurrence. IMRT plans were generated...
The RERF International Low-Dose Symposium was held on 5-6 December 2013 at the RERF campus in Hiroshima, Japan, to discuss the issues facing the Life Span Study (LSS) and other low-dose studies. Topics included the current status of low-dose risk detection, strategies for low-dose epidemiological and statistical research, methods to improve communication between epidemiologists and biologists, ...
The role of aspirin in women with infertility is controversial and the evidence is inconsistent; some studies have reported benefits in women undergoing IVF whilst others have not. An important gap in the literature was the question of when to start and when to stop aspirin and how long should aspirin be given for. In a 2007 systematic review on the effectiveness of aspirin on IVF outcomes invo...
P Introduction ermanent seed-implant treatment using I radionuclide is currently a standard procedure for early-stage prostate carcinoma, and the method is now considered comparable to external-beam radiation therapy and prostatectomy. As with external beam radiation therapy, permanent seed implant treatment of the prostate requires a dose-outcome correction, pointing out the importance of the ...
Background & Aim: Genitalia system cancers are the third most common cancers. In females, surgery and/or radiotherapy±chemotherapy are treatments of choice for cervical, endometrial or vaginal cancers. Brachytherapy is a complementary part of External Beam Radiotherapy(EBRT). MDR(Medium Dose Rate) brachytherapy in female genitalia cancers is founded on two bases: high and appropriate dose d...
Background: We used a MapCHECK software-based dimensional dose distribution comparison method capable of evaluating point-to-point geometrical dose differences in volume to determine whether doses obtained from an enhanced computed tomography (CT)-based treatment plan, which better defines the target regions and organs at risk, differs from doses obtained from plain CT and then evaluated the fe...
Stereotactic body radiation therapy (SBRT) has been increasingly used as an efficacious treatment modality for early-stage non-small cell lung cancer. The accuracy of dose calculations is compromised due to the presence of inhomogeneity. For the purpose of a consistent prescription, radiation doses were calculated without heterogeneity correction in several RTOG trials. For patients participati...
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