نتایج جستجو برای: field irradiation
تعداد نتایج: 847392 فیلتر نتایج به سال:
Introduction: Breast conserving surgery followed by adjuvant radiotherapy (RT) of the whole breast is accepted as the treatment of choice in early stage breast cancer. Due to breast irregularities, it is difficult to access homogenous dose distribution with conventional techniques. Currently, it is possible to use varied breast irradiation techniques, such as field- in-field (F...
Introduction The use of fast field-cycling (FFC) with MRI has increased over recent years. The ability to change the external magnetic field (B0) during MR data acquisition affords access to new contrast mechanisms. In this work, we have applied the FFC technique to magnetisation transfer contrast (MTC) imaging experiments. A continuous-wave off-resonance irradiation pulse (or MT pulse) is wide...
Direct single fields are commonly used in radiotherapy for spinal bone metastases, and it is crucial to define the point for which the dose is prescribed. According to the guidelines from the International Bone Metastases Consensus Working Party (IBMCWP) updated in 2010, different opinions exist on whether this therapy should be prescribed to the mid-vertebral or anterior vertebral body. To our...
this study investigates the relationship between field-related cognitive styles and global reading comprehension of hypertext. technically, field dependency is prevailing dominance of field on perception of parts, while global comprehension is skim-like reading to grasp the general content. in this research project, 60 senior and junior students of arak university majoring in english literature...
Solitary plasmacytoma of bone (SPB) is characterized by localized areas of bone destruction by monoclonal plasma cells in the absence of clinical, laboratory, and radiologic features of multiple myeloma (MM). Local irradiation remains the treatment of choice. United Kingdom national guidelines recommend doses of 40 to 50 Gy depending on tumor size, with a 2-cm margin, because this provides exce...
Human malignant gliomas are highly lethal neoplasms. Involved-field radiotherapy is the most important therapeutic measure. Most relapses originate from the close vicinity of the irradiated target field. Here, we report that sublethal doses of irradiation enhance the migration and invasiveness of human malignant glioma cells. This hitherto unknown biological effect of irradiation is p53 indepen...
PURPOSE The risk of breast cancer is high in women treated for a childhood cancer with chest irradiation. We sought to examine variations in risk resulting from irradiation field and radiation dose. PATIENTS AND METHODS We evaluated cumulative breast cancer risk in 1,230 female childhood cancer survivors treated with chest irradiation who were participants in the CCSS (Childhood Cancer Surviv...
We examined effects of local and whole body irradiation before tooth extraction on appearance and differentiation of osteoclasts in the alveolar bone of rat maxillary first molars. Wistar rats weighting 100 g were divided into three groups: non-irradiation group, local irradiation group, and whole body irradiation group. In the local irradiation group, a field made with lead blocks was placed o...
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