نتایج جستجو برای: radiation doses
تعداد نتایج: 334165 فیلتر نتایج به سال:
Most of the population living in areas close to the Chernobyl accident have been exposed to external and internal low doses of ionising radiation. High doses effects are well known, however low dose radiations had not been yet investigated. The aim of this work was to investigate the cognitive effects of internal low doses ionising radiation. We evaluate the behaviour in mice pups after that pr...
Background: The development of intensity-modulated radiotherapy (IMRT) has revolutionized the management of nasopharyngeal carcinoma (NPC). The purpose of this study was to investigate the impact of clinical stage on radiation doses to organs at risk (OARs) in NPC. Material and Methods: One hundred and forty-eight patients with newly diagnosed and untreated NPC were prospectively enrolled. Base...
BACKGROUND High doses of ionizing radiation result in biological damage; however, the precise relationships between long-term health effects, including cancer, and low-dose exposures remain poorly understood and are currently extrapolated using high-dose exposure data. Identifying the signaling pathways and individual proteins affected at the post-translational level by radiation should shed va...
Purpose: The relationship between biological effects and low doses of radiation is still uncertain, especially for high-LET radiation exposures. Estimates of risk from exposure to low doses and low dose rates are often extrapolated from the Japanese atomic bomb survivor data using either linear or linear-quadratic models fitted to dose–response data. In this study, we determined the dose–respon...
Background: Colorectal carcinoma is a common malignancy, in treatment of which pelvic radiotherapy plays an important role. But this may lead to azospermia. We designed a study to determine the delivered dose to the testis with thermoluminescence dosimetry (TLD) and compare it to the dose calculated by the Three-dimensional planning software. Methods: We measured the testicular doses by TLD th...
Neoplasms of the central nervous system (CNS) are a pathologically diverse group of benign and malignant tumors for which a variety of management strategies, including observation, surgery, radiation therapy, and/or chemotherapy, are employed. Shown in Table 1 are the usual radiation doses used to treat primary and metastatic brain and spinal cord tumors, which span a broad range of total doses...
LBA4505, 2009). Chemoradiation The addition of chemotherapy to radiation therapy has been shown to improve the survival of patients with unresectable pancreatic adenocarcinoma, with moderate doses of radiation only slightly less effective than higher doses. In a GITSG trial of unresectable disease, moderate-dose radiation (4,000 cGy) with 5-FU chemotherapy significantly improved survival, as co...
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