نتایج جستجو برای: dosimetric characteristics beam shaper applicator conventional applicator
تعداد نتایج: 1010248 فیلتر نتایج به سال:
background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...
Purpose/Objectives: Cervical cancer patients with disease extending laterally into parametrial tissue often require interstitial trans-perineal implantation under general anesthesia and a hospital stay for brachytherapy treatments. A major disadvantage of intraoperative implantation is the lack of 3D image guidance during needle placement. Here, we describe real-time CT-guidance to allow inters...
Three dimensional planning for high-dose-rate (HDR) brachytherapy in cervical cancer has been highly recommended by consensus guidelines such as the American Brachytherapy Society (ABS) and the Groupe Européen de Curiethérapie - European Society for Radiotherapy and Oncology (GEC-ESTRO). In this document, we describe our experience with computed tomography (CT)-based planning using the tandem/r...
I T HAS been recognized that intracavi-tary irradiation is essential in the treatment of carcinoma of the uterine cervix. Since the beginning of the present century3 many applicators have been used to irradiate the uterus and vagina and later several afterloading techniques have been de-scnibed. " 4 Some of the techniques involve the use of remote control5 " and linear distribution of the sourc...
The purpose of this study is to find the uncertainties in the reconstruction of MR compatible ring-tandem intracavitary applicators of high-dose rate image-based brachytherapy treatment planning using rigid registration of 3D MR and CT image fusion. Tandem and ring reconstruction in MR image based brachytherapy planning was done using rigid registration of CT and MR applicator geometries. Verif...
For each patient receiving definitive treatment for cervix cancer, several CT/MR imaging studies need to be registered in order to specify the total physical or biological dose to each fixed tissue voxel in an organ system. This turns out to be a difficult problem due to large localized deformations and displacements of bladder, rectum, vagina, uterus and paracervical tissues due to tumor regre...
Background: For an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. The usual method to determine these factors is thermo luminescent dosimeter (TLD) dosimetry. Nowadays, another more accurate method is known to be the Monte Carlo ...
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...
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