نتایج جستجو برای: gross tumor volume
تعداد نتایج: 763409 فیلتر نتایج به سال:
Accurate delineation of clinical target volume (CTV) is critical in the effective management of squamous cell carcinoma (SCC) of esophagus using radiation therapy. Accurate delineation may improve the probability of local control and reduce the risk of complications. However, there are no consistent standards on the proper size of the margins added to the gross tumor volume (GTV). Different ins...
BACKGROUND This study aimed for a collaborative evaluation of variability in the target volumes for glioblastoma, determined and contoured by different radiotherapy (RT) facilities in Korea. METHODS Fifteen panels of radiation oncologists from independent institutions contoured the gross target volumes (GTVs) and clinical target volumes (CTVs) for 3-dimensional conformal RT or intensity-modul...
Fluorine-18-fluorodeoxyglucose- positron emission tomography ((18)F-FDG PET) in head and neck cancer patients is useful for staging, identification of macroscopic disease, detection of invaded lymph nodes and distant metastases, delineation of radiotherapy target volume and assessment of treatment response. This brief review addresses the potential role of PET in radiotherapy planning as compar...
background: measurement of gross , gross activities, and cosmogenic beryllium-7 (7be) concentrations were made both daily and weekly during the years 2001- 2004 from samples of atmospheric aerosols filtered from the air at tehran nuclear research center (35 41' n) and zahedan (28 29' n). materials and methods: weekly aerosol samples were collected with the high-volume air samplers on ...
PURPOSE To investigate the relationship between early treatment response to definitive chemoradiotherapy (CRT) and survival outcome in patients with limited stage small cell lung cancer (LS-SCLC). MATERIALS AND METHODS We retrospectively reviewed 47 patients with LS-SCLC who received definitive CRT between January 2009 and December 2012. Patients were treated with systemic chemotherapy regime...
PURPOSE T2-weighted (T2W) magnetic resonance imaging (MRI) has been used for target delineation in cervix cancer brachytherapy. The objective of this study was to examine the feasibility of using diffusion-weighted magnetic resonance imaging (DWI) for target delineation as compared against T2W imaging. MATERIAL AND METHODS Fifteen cervix cancer patients, implanted with tandem and ovoid applic...
Purpose: We tested therapeutic efficacy of two dose painting strategies of applying higher radiation dose to tumor subvolumes with high FDG uptake (biologic target volume, BTV): dose escalation and dose redistribution. We also investigated whether tumor response was determined by the highest dose in BTV or the lowest dose in gross tumor volume (GTV). Experimental Design: FDG uptake was evaluate...
Objective: To examine acute skin and oral mucosal reactions and identify their major influencing factors in patients with nasopharyngeal carcinoma (NPC) undergoing concurrent radiochemotherapy. Methods: The study enrolled 85 NPC patients who were treated with concurrent radiochemotherapy. Fifteen clinical and laboratory indices were examined, including blood mass index (BMI), weekly radiation d...
PURPOSE To report the clinical outcome of patients treated with intensity-modulated radiation therapy (IMRT) for malignancies of the nasal cavity and paranasal sinuses. METHODS AND MATERIALS Between 1998 and 2004, 36 patients with malignancies of the sinonasal region were treated with IMRT. Thirty-two patients (89%) were treated in the postoperative setting after gross total resection. Treatm...
PURPOSE Increased tumor metabolism and hypoxia are related to poor prognosis in solid tumors, including non-small cell lung cancer (NSCLC). PET imaging is a noninvasive technique that is frequently used to visualize and quantify tumor metabolism and hypoxia. The aim of this study was to perform an extensive comparison of tumor metabolism using 2[(18)F]fluoro-2-deoxy-d-glucose (FDG)-PET and hypo...
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