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Showing 1 to 20 of 54 for “"brachytherapy"”.
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Advanced brachytherapy dosimetric considerations
The practice of brachytherapy and brachytherapy dosimetry was investigated with emphasis on evaluations of dose distributions and shielding considerations for both photon- and neutron-emitting radionuclides. Monte Carlo simulation methods were employed to calculate dose distributions for virtual …
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DOSIMETRIC STUDY OF BETA-MINUS EMITTER PRASEODYMIUM-142 : APPLICATIONS IN MICROSPHERE BRACHYTHERAPY FOR HEPATOCELLULAR CARCINOMA AND BRACHYTHERAPY FOR OCULAR SQUAMOUS CELL CARCINOMA
… main innovative applications of this source in brachytherapy are proposed: microsphere brachytherapy and eye plaque brachytherapy. ¹⁴²Pr (96.3% beta and 3.7% gamma) has recently gained increased attention among beta sources for therapy. Its inherent physical and dosimetric characteristics may be …
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Immobilization and Catheter Guidance for Breast Brachytherapy Using Patient-Specific Templates
Brachytherapy is an important method of breast cancer treatment; however, improvements in both treatment planning and delivery are needed. The procedure involves insertion of catheters in the tumor site, which, in current practice, is prone to clinically significant error. In order to improve on …
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Gamma and neutron dose profiles near a Cf-252 brachytherapy source
… remote afterloading systems for interstitial brachytherapy. A recent in-water calibration experiment showed that the measured gamma dose rates near the new source are slightly greater than the neutron dose rates; contradicting the well established neutron-to-gamma dose ratio of approximately …
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Automated Treatment Planning in High Dose-Rate Brachytherapy for Cervical Cancer
… to the cervix tumor site with High-dose-rate brachytherapy (HDRBT). HDRBT is a procedure that involves the insertion of radioactive sources into the tumorous area to ablate the cancer. Treatment planning for the procedure is typically performed on the day of treatment. The complex treatment …
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An Absorbed Dose to Water Primary Standard for Ir-192 Brachytherapy
… dose to water primary standard for Ir-192 brachytherapy by using a Fricke dosimeter. The radiation chemical yield (G-value) of the Ferric ions in the Fricke solution was measured at Co-60 and 250 kVp X-ray, yielding 1.610 ± 0.010 μmol J-1 and 1.602 ± 0.009 μmol J-1 respectively. A …
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Improved seed-based MR and CT image registration for prostate brachytherapy
… using tightly focused radiation therapy. Brachytherapy treatment, the implantation of radioactive seeds into the prostate, is increasing in popularity, spurred by advances in medical imaging techniques for prostate visualization. Successful brachytherapy requires precise positioning of …
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Characterization of The New Xoft Axxent Electronic Brachytherapy Source Using Presage(Tm)
… advances in the burgeoning field of electronic brachytherapy, an accurate method of 3D dosimetry is needed to ensure understanding of dose distributions, which can improve patient care. The aim of this study was to characterize the Xoft Axxent electronic brachytherapy source using …
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Endoscopic Resection and Post-Operative Brachytherapy in the Treatment of Sinonasal Melanoma
… the first to report on the use of post-operative brachytherapy in an attempt to prevent local recurrence after endoscopic resection of SNM. Methods: A retrospective analysis of all patients undergoing endoscopic resection of SNMs and receiving adjuvant brachytherapy in a single surgeon’s practice …
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Design of an Ytterbium-169 brachytherapy source for gold nanoparticle-aided radiation therapy
… is a strong candidate for a high dose rate brachytherapy implementation of gold nanoparticle-aided radiation therapy. Therefore, the current study focuses on the design of a high dose rate Ytterbium-169 source that would maximize dose enhancement during gold nanoparticle-aided radiation …
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Increasing staff comfort in performing conscious sedation during brachytherapy : a teaching quality improvement project
… of oral anxiolytics for patients undergoing brachytherapy within a specific cancer center (CC) has had inadequate outcomes for pain control and anxiety. The CC decided to transition to intravenous sedation; however, there was concern from the nursing staff regarding patient safety, due to the …
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Dose intercomparisons between computer planning, in-vivo and phantom measurements for Iridium-192 HDR Brachytherapy
… high-dose rate (HDR) intracavitary brachytherapy (ICBT), invivo dosimetry is done to monitor the dose received by the bladder and rectum. This study was aimed at validating the need to do in-vivo dosimetry during ICBT. Thirty patients were recruited to participate in the study. …
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Measured dose distributions of iodine-125 sources and the computerised optimisation of their positions in brachytherapy planning
The use of 1-125 seeds in brachytherapy is widespread and becoming increasingly varied. The spatial dose distributions around two types of 1-125 seeds in general use, were measured using a Geiger-Muller chamber. Seeds with the 1-125 adsorbed onto resin spheres had a 10% less anisotropic dose …
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Brachytherapy and endoresection in the treatment of choroidal melanoma a review of patients treated in South Africa
… undergoing two different treatment modalities (brachytherapy and endoresection) for medium sized choroidal melanoma. Study methods involve the collection of baseline and follow-up data from three sources: 1) A database collected by the department of Radiation Oncology at Groote Schuur Hospital; …
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Attitudes and practices contributing to vaginal stenosis among cervical cancer survivors receiving brachytherapy at CDH in Lusaka, Zambia.
… of vaginal stenosis in women receiving brachytherapy. This study aimed at determining attitudes and practices that contribute to vaginal stenosis among cervical cancer survivors receiving brachytherapy at Cancer Diseases Hospital in Lusaka (CDH) in Lusaka, Zambia. A descriptive …
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Study of Dosimetric and Thermal Properties of a Newly Developed Thermo-brachytherapy Seed for Treatment of Solid Tumors
… We propose a new self-regulating Thermo-brachytherapy (TB) seed, which serves as a source of both radiation and heat for concurrent administration of brachytherapy and hyperthermia. <P>The proposed seed is based on the BEST seed model 2301, where the tungsten marker core and the air gap …
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Spinal anaesthesia for brachytherapy for carcinoma of the cervix a comparison of two dose regimes of hypebaric bupivacaine
… intrathecal fentanyl, for spinal anaesthesia for brachytherapy for carcinoma of the cervix. This procedure is performed as a day case at Groote Schuur Hospital.
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Application and Development of Algebraic Reconstruction Algorithms for High Dose Rate Brachytherapy Gel Dosimetry with Optical Computed Tomography Readout
… specific quality assurance. High dose rate (HDR) brachytherapy treatments have become more complex, but patient specific QA has not been adopted. One reason for this is the lack of inexpensive, simple to use, accurate, and complete dosimeters for brachytherapy. Radiochromic gel dosimeters with …
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Development and Implementation of A Remote Audit to ol For High Dose Rate (Hdr) 192Ir Brachytherapy Using Optically Stimulated Luminescence Dosimetry
… with accuracy suitable for RPC audits of HDR brachytherapy sources at institutions participating in NCI-funded cooperative clinical trials. An 8 × 8 × 10 cm<sup>3</sup> prototype with two slots capable of holding nanoDot Al<sub>2</sub>O<sub>3</sub>:C OSL dosimeters (Landauer, Glenwood, IL) was …
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