... Descriptors : *LINEAR ACCELERATORS, *MEDICAL EQUIPMENT, ELECTRON ACCELERATORS, RADIOTHERAPY, ELECTRON BEAMS ...
DTIC Science & Technology
The physical, mechanical and dosimetric features of betatrons are described and discussed. Reference is also made to difficulties that may arise and the limitations associated with their employment as electron accelerators in radiotherapy. PMID:828281
PubMed
This project clearly demonstrates that intensity modulated electron arc radiotherapy is feasible using the photon multi-leaf collimator of a modern linear accelerator. Secondary and tertiary collimators are replaced by the multi-leaf collimator and by dyn...
National Technical Information Service (NTIS)
The electron linac provides a straightforward, state-of-the-art method of producing the primary beam required for a hospital-based multiport pion radiotherapy facility for cancer treatment. The accelerator and associated beam transport system described ar...
The International Electrotechnical Commission (IEC) worked out international standards for requirements and tests of electrical, mechanical and radiation safety as well as for definition and tests of functional performance characteristics of radiotherapy equipments (medical electron accelerators, gamma beam teletherapy and afterloading ...
Radiotherapy electron beams are more complicated than photon beams due to variations in the beam production, the scattering of low-energy electrons, and the presence contaminant photons. The detailed knowledge of a radiotherapy beam is essential to an accurate calculation of dose distribution for a treatment ...
NASA Astrophysics Data System (ADS)
Current utilization of the linear accelerator as well as 5-year cumulative experience in radiotherapy is presented. Cutaneous lymphomas and mammary gland carcinomas were the prime experience region; however, cancers at other locations were treated with mi...
The electron linear accelerator was first used to generate X-rays for radiation therapy in the early 1950s and is today the main type of machine used in this field. This book provides knowledge of a wide range of technology involved in the design and operation of linear accelerations for radiotherapy, and of the ...
Energy Citations Database
The recent international standards published by the International Electrotechnical Commission (IEC) on the performance of medical electron accelerators describe suggested test procedures for the performance of radiotherapy accelerators. The recommendations of the Nordic Association of Clinical Physics for testing ...
A compact mono-energetic gamma source is being developed to replace the radiological sources used in radiotherapy and other medical instruments. The electronic gamma source utilizes low-energy nuclear reactions to generate gammas in the 0.5 to 1.0 MeV energy range. Independent control of the ion current and energy is achieved by decoupling the RF-driven ...
The quality of the radiotherapic treatment depends strongly on the capability to measure the dose released in the treated volume and the one absorbed by the surrounding volumes, which is mainly due to the scattered radiation produced by the primary beam interaction with the accelerator collimating system. Radiotherapy linear ...
The Monte Carlo simulation of clinical electron linear accelerators requires large computation times to achieve the level of uncertainty required for radiotherapy. In this context, variance reduction techniques play a fundamental role in the reduction of this computational time. Here we describe the use of the ant colony method to ...
The most recent experimental results obtained with laser-plasma accelerators are applied to radio-therapy simulations. The narrow electron beam, produced during the interaction of the laser with the gas jet, has a high charge (0.5 nC) and is quasimonoenergetic (170 +/- 20 MeV). The dose deposition is calculated in a water phantom ...
... Descriptors : *Linear accelerators, *Ion accelerators, *Particle accelerator components, *Electron accelerators, *Proton accelerators, Electron beams ...
Although the developments of particle accelerators are devoted to basic study of matter constituents, since the beginning these machines have been applied with different purposes in many areas also. Today particle accelerators are essential instruments for science and technology. This work presents an overview of the main application for direct particle ...
... Descriptors : (*LINEAR ACCELERATORS, ELECTRON ACCELERATORS), (*ELECTRON ACCELERATORS, NUCLEAR SCATTERING), ELASTIC ...
... Descriptors : *ELECTRON ACCELERATORS, *LINEAR ACCELERATORS, *MICROWAVES, *TRAVELING WAVE ELECTRON ACCELERATORS ...
This paper outlines technological considerations in the design of accelerator facilities for medical applications. Emphasis is placed on the specific requirements for MARIA, a radioisotope and radiotherapy facility being planned in Edmonton, Canada. The m...
For radiation therapy at medium and high energies the circular and the racetract microtron are ideally suited electron accelerators. The fine energy definition of the electron beam from a microtron allows the use of beam transport from one accelerator to several treatment units. This possibility makes an ...
From second meeting on fundamental and practical aspects of the application of fast neutrons in clinical radiotherapy; The Hague, Netherlands (3 Oct 1973). Recently great interest has been shown in pi-meson irradiation as a possible modality for cancer radiation therapy. In order for this short-lived particle to be more than an idle laboratory curiosity, it must be ...
DOE Information Bridge
The DICOM standard protocol of medical image exchange and its extensions to radiotherapy data has been implemented in order to enable electronic communication between all modalities within our radiology and radiotherapy departments. The network architecture used for radiotherapy includes as basic elements one CT ...
In this multicentric survey, the management costs and the technical problems connected with the use of electron accelerators in Radiotherapy are studied. The data were collected by a proper questionnaire and concern 11/35 accelerators in use in Italy, in public hospitals, during the period 1982-1983. The average ...
The thermoluminescence (TL) characteristics of a set of six chemical vapour deposited diamond films have been studied with regard to their use as off-line dosimeters in radiotherapy. The structural characterisation has been performed by means of Raman spectroscopy. Their TL responses have been tested with radiotherapy beams (60Co photons, photons and ...
An Image-Guided Radiotherapy-capable linear accelerator (Elekta Synergy) was installed at our hospital, which is equipped with a kV x-ray volume imaging (XVI) system and electronic portal imaging device (iViewGT). The objective of this presentation is to describe the results of commissioning measurements carried out on the XVI facility ...
An Image-Guided Radiotherapy�capable linear accelerator (Elekta Synergy) was installed at our hospital, which is equipped with a kV x-ray volume imaging (XVI) system and electronic portal imaging device (iViewGT). The objective of this presentation is to describe the results of commissioning measurements carried out on the XVI ...
PubMed Central
Laser plasma accelerators provide electron beams with parameters of interest in many fields and in particular for radiotherapy. A short review of progress achieved recently will be presented. We have performed dose deposition simulations using a quasi-monoenergetic electron beam in the 200 MeV range as produced ...
BackgroundAccelerated hypofractionation is an attractive approach for adjuvant whole breast radiotherapy. In this study we evaluated the adverse effects at least 3 years post an accelerated hypofractionated whole breast radiotherapy schedule.MethodsFrom October 2004 to March 2006, 39 consecutive patients aged over ...
There has been increasing interest in combining Boron Neutron Capture Therapy (BNCT) with standard radiotherapy, either concomitantly or as a BNCT treatment of a recurrent tumor that was previously irradiated with a medical electron linear accelerator (LINAC). In this work we report the simulated dosimetry of treatments combining ...
Research reports are cited on the use of gamma rays, x-rays, protons, electrons, neutrons, heavy ions, negative pions, and radioisotopes in radiotherapy. The bibliography includes data on particle accelerators, dosimetry, and health physics. The effectiveness of radiation for the treatment of cancer and hyperthyroidism is emphasized. ...
Current utilization of the linear accelerator as well as 5-year cumulative experience in radiotherapy is presented. Cutaneous lymphomas and mammary gland carcinomas were the prime experience region; however, cancers at other locations were treated with mixed-beam therapy; employing fast neutrons and photon beams. The technique appears promising for ...
Continuous, hyperfractionated, accelerated radiotherapy (CHART) was devised to give the maximum chance of improving clinical radiotherapy and was based upon available radiobiological evidence. A pilot study, begun in 1985, has now included 210 patients. When comparison is made with previously treated cases, improved results have been ...
Continuous, hyperfractionated, accelerated radiotherapy (CHART) has given high levels of tumour control in advanced head and neck and bronchial carcinomas. In general, late changes have appeared less than after conventional radiotherapy but despite a prediction of reduced risk of spinal cord damage, two cases of radiation myelitis have ...
A discussion of the desirable characteristics of an electron accelerator for radiotherapy is given, based on personal interviews with a number of radiotherapists and radiological physicists in the United States. It is quite possible that the racetrack microtron, in its fully-developed form, will meet these requirements at a ...
Spain's radiation oncology infrastructure has evolved in terms of both quantity and structure since the last analysis was carried out in 1999. The purpose of this paper is to describe the current facilities, basically consisting of external radiotherapeutic units, and to present a calculation model for estimating the number of irradiation units required to guarantee equitable cover for ...
The employment of the technology of semiconductor detectors, in the medical physics environment is of great importance due to its versatility and dependability. In this work we present the first results and the experimental arrangement employed with PIN diodes that are conditioned for the measurement of the field of irradiation of a lineal accelerator (LINAC) used in ...
Plastic scintillators have many advantages for dosimetry in external beam radiotherapy. The current method of transmitting the scintillation light to a remote detector is through a solid core optical fibre. When exposed in a high energy therapeutic radiotherapy beam this fibre is subject to an unwanted background signal from Cerenkov light which can exceed ...
The electron linac provides a straightforward, state-of-the-art method of producing the primary beam required for a hospital-based multiport pion radiotherapy facility for cancer treatment. The accelerator and associated beam transport system described are capable of generating an electron beam of about 250 kW and ...
