... Title : DOSIMETRY, BIOMONITORING AND VERIFICATION OF EXPOSURE TO ... AMINOTERMINAL HEPTAPEPTIDE IN THE ALPHA-CHAIN OF ...
DTIC Science & Technology
... Title : Verification, Dosimetry, and Biomonitoring of Mustard Gas Exposure via Immunochemical Detection of Mustard Gas Adducts to DNA and ...
... TITLE: Verification, Dosimetry and Biomonitoring of Mustard Gas Exposure via Immunochemical Detection of Mustard Gas Adducts to DNA and ...
... Title : Verification, Dosimetry and Biomonitoring of Mustard Gas Exposure via Immunochemical Detection of Mustard Gas Adducts to DNA and ...
... Accession Number : ADA408163. Title : Computer Aided Dosimetry and Verification of Exposure to Radiation. Descriptive Note : Technical rept. ...
Calorimeters used in absolute dosimetry of radioisotopes, for radium standards calibration, and in reactor dosimetry are briefly described. The method of using calorimeters and the results achieved in this field are reported. (auth)
Energy Citations Database
Page 1. AD-A240 471 GRANT NO. DAMDl7-88-Z-S022 TITLE: Verification, Dosimetry and Biomonitoring of Mustard Gas ...
In this paper we present the recent developments made for the scanning system for proton beams at TSL in Uppsala, showing that this system is now fully functional being able to produce conformal intensity modulated scan patterns with sufficient accuracy. A new control and supervising system handling the beam delivery including the control of the synchrocyclotron and the scanning system is ...
NASA Astrophysics Data System (ADS)
The software package "Dosimetry Check" by MathResolutions, LLC, provides an absolute 3D volumetric dose measurement for IMRT QA using the existing Electronic Portal Imaging Device (EPID) mounted on most linear accelerators. This package provides a feedback loop using the patient's treatment planning CT data as the phantom for dose reconstruction. The aim ...
The problem of absolute energy dosimetry with a calorimeter in the radiation field of a neutron generator is discussed. The following measurement methods were investigated: gamma and neutron dosimetry, and calorimetry. A calorimeter was developed, and a l...
National Technical Information Service (NTIS)
During the past year a dosimetry research program has been established in the School of Nuclear Engineering at the Georgia Institute of Technology. The major objective of this program has been to provide research results upon which a useful internal dosimetry system could be based. The important application of this dosimetry system ...
The evaluation of the agreement between measured and calculated dose plays an essential role in the quality assurance (QA) procedures for intensity modulated radiation therapy (IMRT). Film dosimetry has been widely adopted for this purpose due to excellent film characteristics in terms of spatial resolution; unfortunately, it is a time-consuming procedure and requires great ...
Photon and electron dosimetry equipment and procedures are described. Radiation sources; primary standards for photon radiation in air; ionization chamber standards for water phantoms; chemical dosimetry; absolute determination of absorbed dose; type test...
Some typical calorimeters used in absolute dosimetry of natural and artificial radioisotopes, for radium standards calibration, and in reactor dosimetry are briefly described. The methods for using the calorimeters and the results obtained are reported. (auth)
We have used the DosimetryCheck program with the EPID's on our Varian 2100EX's to perform pre-treatment QA on more than 350 patients, between the last quarter of 2006 and the present. The software uses the EPID measured fluences of the treatment fields to reconstuct the dose distribution in the CT planning model of the patient. Since the dose calculation algorithm, is ...
Purpose: Intensity-modulated radiotherapy (IMRT) represents an important method for improving RT. The IMRT relative dosimetry checks are well established; however, open questions remain in reference dosimetry with ionization chambers (ICs). The main problem is the departure of the measurement conditions from the reference ones; thus, additional uncertainty ...
The radiation produced by a 15.5-Mev mono-energetic electron beam incident on optimized and non-optimized bremsstrahlung targets is characterized using the ITS Monte Carlo code and measurements with equilibrated and non-equilibrated TLD dosimetry. Comparisons between calculations and measurements verify the calculations and demonstrate that the code can be used to predict both ...
In this paper the radiation produced by a 15.5-MeV mono-energetic electron beam incident on optimized and non-optimized bremsstrahlung targets is characterized using the ITS Monte Carlo code and measurements with equilibrated and non-equilibrated TLD dosimetry. Comparisons between calculations and measurements verify the calculations and demonstrate that the code can be used ...
The radiation produced by a 15.5-MeV monoenergetic electron beam incident on optimized and nonoptimized bremsstrahlung targets is characterized using the ITS Monte Carlo code and measurements with equilibrated and non-equilibrated TLD dosimetry. Comparisons between calculations and measurements verify the calculations and demonstrate that the code can be used to predict both ...
Intensity modulated radiotherapy (IMRT) has become a treatment of choice in many oncological institutions. Small fields or beamlets with sizes of 1 to 5 cm2 are now routinely used in IMRT delivery. Therefore small ionization chambers (IC) with sensitive volumes <=0.1 cm3are generally used for dose verification of an IMRT treatment. The measurement conditions during ...
Dose distributions generated from intensity-modulated-radiation-therapy (IMRT) treatment planning present high dose gradient regions in the boundaries between the target and the surrounding critical organs. Dose accuracy in these areas can be critical, and may affect the treatment. With the increasing use of IMRT in radiotherapy, there is an increased need for a dosimeter that allows for accurate ...
PubMed
The absolute dose rate around beta sources for intravascular brachytherapy was measured with thin thermoluminescent (TL) dosimeters and radiochromic film. The calibration of these dosimeters was performed at the dose maximum in a 6 MeV electron beam of a linear accelerator. Compared to the values given by the manufacturers, higher dose rates of about 20% for 90Sr/90Y source ...
Synchrotron stereotactic radiotherapy (SSR) consists in loading the tumour with a high atomic number element (Z), and exposing it to monochromatic x-rays from a synchrotron source (50-100 keV), in stereotactic conditions. The dose distribution results from both the stereotactic monochromatic x-ray irradiation and the presence of the high Z element. The purpose of this preliminary study was to ...
In vivo dosimetry has a well established role in the quality assurance of 2D radiotherapy and 3D conformal radiotherapy. The role of in vivo dosimetry for IMRT is not as well established. IMRT introduces a range of technical issues that complicate in vivo dosimetry. The first decade or so of IMRT implementation has largely relied upon ...
Monte Carlo (MC) simulations have traditionally been used for single field relative comparisons with experimental data or commercial treatment planning systems (TPS). However, clinical treatment plans commonly involve more than one field. Since the contribution of each field must be accurately quantified, multiple field MC simulations are only possible by employing absolute ...
The use of electronic portal imaging devices (EPIDs) is a promising method for the dosimetric verification of external beam, megavoltage radiation therapy--both pretreatment and in vivo. In this study, a previously developed EPID back-projection algorithm was modified for IMRT techniques and applied to an amorphous silicon EPID. By using this back-projection algorithm, ...
The report advised the Judge Advocates General of the military services concern the relative merits of the three main methods of speaker verification and gives some indication of their absolute value as legal evidence. It then recommends concerning which ...
This research has been directed toward the development of experimental techniques for the evaluation of internal-dosimetry calculations. There have been three major objectives. The first was the development and refinement of dosimetric techniques necessar...
During the past year a dosimetry research program has been established in the School of Nuclear Engineering at the Georgia Institute of Technology. The major objective of this program has been to provide research results upon which a useful internal dosim...
The 2D ionization chamber array I'mRT MatriXX (IBA, Schwarzenbruck, Germany) has been developed for absolute 2D dosimetry and verification of intensity-modulated radiation therapy (IMRT) for perpendicular beam incidence. The aim of this study is to evaluate the applicability of I'mRT MatriXX for oblique beam incidence and hybrid plan ...
For reasons of phantom material reproducibility, the absorbed dose protocols of the American Association of Physicists in Medicine (AAPM) (TG-51) and the International Atomic Energy Agency (IAEA) (TRS-398) have made the use of liquid water as a phantom material for reference dosimetry mandatory. In this work we provide a formal framework for the measurement of absorbed dose to ...
Advances in radiation treatment with beamlet-based intensity modulation, image-guided radiation therapy, and stereotactic radiosurgery (including specialized equipments like CyberKnife, Gamma Knife, tomotherapy, and high-resolution multileaf collimating systems) have resulted in the use of reduced treatment fields to a subcentimeter scale. Compared to the traditional radiotherapy with fields ...
Advances in radiation treatment with beamlet-based intensity modulation, image-guided radiation therapy, and stereotactic radiosurgery (including specialized equipments like CyberKnife, Gamma Knife, tomotherapy, and high-resolution multileaf collimating systems) have resulted in the use of reduced treatment fields to a subcentimeter scale. Compared to the traditional radiotherapy with fields > ...
... of the trajectories so that a correction factor might be applied to computations made in the future Methods The Bellamy trajectory slide rule was not ...
... be meaningfully characterized using the LMTF, LNPS and LNEQ functions. ... A standard modulation transfer function (MTF) is the absolute value of ...
the verification of the antenna beam alignment of all frequencies and polarizations,. the determination of the absolute calibration factor from the image ...
NASA Website
... In the absolute worst case, assuming that the nature of the fault and the business conditions really motivate V to cheat, the cost finding such a � ...
... Figure 68: HPLC-chromatogram (ODS-Sephadex, reversed-phase column) of calf-thymus DNA after enzymatic degradation into nucleosides. 173 ...
... conveniently divided into two (2) phases: prodromal (initial ... and the T cells regulate cell-mediated immunity. ... from radiation inhibition of mitosis of the ...
Purpose:To investigate the clinical usage of dose verification of Helical Tomotherapy plans by using 2D-array ion chambers, and to develop an efficient way to validate the dose delivered for the patients during treatments.Materials and Methods:A pixel-segmented ionisation chamber device, IMRT MatriXX� and Multicube� phantom from IBA were used on ten selected Tomotherapy ...
PubMed Central
The overview of the results of development, verification and application of the methods of individual retrospective physical dosimetry among population of settlements contaminated with radionuclides, which suffered from irradiation as a result of the accident in Chernobyl NPP, and among the population located in the vicinity of the Semipalatinsk nuclear ...
Convenient methods for diagnosis and dosimetry of exposure to chemical agents are not available, but are urgently needed. Immunochemical methods have now been developed for diagnosis and dosimetry of exposure to mustard gas. Exposure of calf-thymus DNA an...
The ultimate check of the actual dose delivered to a patient in radiotherapy can only be achieved by using in vivo dosimetry. This work reports a pilot study to test the applicability of a thermoluminescent dosimetric system for performing in vivo entrance dose measurements in external photon beam radiotherapy. The measurements demonstrated the value of thermoluminescent ...
A technical review has been conducted of the cooled optically-stimulated luminescence (COSL) technique for high-dynamic-range dosimetry. Hardware and data presented by the technology developers have been examined. Applications of the COSL technology to tasks in treaty verification are identified, and possible problems in implementing the applications are ...
DOE Information Bridge
Inverse planning utilized in Intensity Modulation Radiation Therapy (IMRT) results in steep dose gradients near edges of tumors and critical structures. It is imperative for both tumor control and quality of life that the prescribed treatment dose is delivered accurately. Dose verification for IMRT is more complicated than conventional treatment ...
Electronic portal imagers have promising dosimetric applications in external beam radiation therapy. In this study a patient dose computation algorithm based on Monte Carlo (MC) simulations and on portal images is developed and validated. The patient exit fluence from primary photons is obtained from the portal image after correction for scattered radiation. The scattered radiation at the portal ...
A review is given of the clinical use of EPID dosimetry in the Department of Radiation Oncology of The Netherlands Cancer Institute�Antoni van Leeuwenhoek Hospital. All curative plans (almost all IMRT or VMAT) are verified with EPID dosimetry, mostly in vivo. The 2D approach for IMRT verification and the 3D method for VMAT ...
With the aim of developing an Italian national normative governing the certification of agencies performing special x and gamma ray radiation personnel dosimetry for the extremities and eyes, ENEA (Italian Agency for New Technology, Energy and the Environ...
For quality assurance measurements in radiotherapy with scanned ion beams, such as beam profile measurements and dosimetrical verification of patient plans, high spatial accuracy is required. We investigated the Gafchromic EBT film, which is the ancestor of the currently available EBT2 film, for this purpose. The excellent spatial resolution and improvements in sensitivity as ...
A multicentre phase II trial of stereotactic body radiotherapy for T1N0M0 non-small cell lung cancer was initiated in Japan as the Japan Clinical Oncology Group trial (JCOG0403). Before starting the trial, a decision was made to evaluate the treatment machine and treatment planning in participating institutions to minimize the variations of the prescription dose between the institutions. We ...
Dosimetric verification of delivery for intensity-modulated radiotherapy (IMRT) treatment plans is critical to ensure accurate and safe patient treatments. Commonly, a point dose measurement using a calibrated ion chamber as well as a planar dose measurement using film was traditionally implemented for dosimetric quality assurance (QA) of treatment plans. However, new products ...
A Geant4 based simulation tool has been developed to perform Monte Carlo modelling of a 6 MV VarianTM iX clinac. The computer aided design interface of Geant4 was used to accurately model the LINAC components, including the Millenium multi-leaf collimators (MLCs). The simulation tool was verified via simulation of standard commissioning dosimetry data acquired with an ...
E-print Network
A commercial amorphous silicon electronic portal imaging device (EPID) has been studied to investigate its potential in the field of pretreatment verifications of step and shoot, intensity modulated radiation therapy (IMRT), 6 MV photon beams. The EPID was calibrated to measure absolute exit dose in a water-equivalent phantom at patient level, following an ...
This paper investigates the accuracy of the two available calculation algorithms of the Oncentra MasterPlan three-dimensional treatment planning system (TPS)-- the pencil beam method and collapsed-cone convolution--in modeling the Varian enhanced dynamic wedge (EDW). Measurements were carried out for a dual high energy (6-15 MV) Varian DHX-S linear accelerator using ionization chambers for beam ...
This paper presents the procedures and results of dosimetric verification using an Electronic Portal Imaging Device as a tool for pre-treatment dosimetry in IMRT technique at the Greater Poland Cancer Centre in Poznan, Poland. The evaluation of dosimetric verification for various organ, during a 2 year period is given.
This paper presents the procedures and results of dosimetric verification using an Electronic Portal Imaging Device as a tool for pre-treatment dosimetry in IMRT technique at the Greater Poland Cancer Centre in Poznan, Poland. The ewaluation of dosimetric verification for various organ, during a 2 year period is given.
Significant deviations from the expected dose have been reported in the absolute dosimetry validation of an intensity modulated radiation therapy treatment when individual segments are analyzed. However, when full treatment is considered and all segment doses are added together, these discrepancies fade out, leading to overall dose deviations below a 5% ...
This Enviornmental Technology Verification reports on the characteristics of a paint spray gun. The research showed that the spray gun provided absolute and relative increases in transfer efficiency over the base line and provided a reduction in the use of paint. For a PD...
EPA Science Inventory
B.2 gives the typical and worst case value of the absolute deviation of Rij from unity in each band for the stars and the cold sources. ...
of the retrenchment technique. Retrenchment is intended to help bridge the gap between the absolute precision imprecision of the wider require- ments milieu. Retrenchment, and its interplay with other verification
The neutron spectrum was measured using a combination of foil detectors. The absolute thermal flux was measured with gold foils using a beta-gamma coincidence counting technique; the epithermal spectrum was measured by taking cadmium ratios with three dif...
Purpose/Objective(s): Unlike external beam treatment planning system (TPS) commissioning, a brachytherapy TPS requires little input, no modeling with most brachytherapy TPS calculations are based on the AAPM TG-43 formalism. The dose distribution using the AAPM TG-43 dose formalism is usually compared with the calculations using the Sievert summation, Monte Carlo simulation or dose distributions ...
This single case clearly illustrates the potential value of postmortem radioassay of tissues with regard to our understanding of uranium biokinetics and distribution in tissues, and for application to dosimetry, retrospective of analysis of exposure, and to establishment, verification and refinement of safety standards for uranium. 3 tabs.
Quantitative estimates of tissue dosimetry of environmental chemicals due to multiple exposure pathways require the use of complex mathematical models, such as physiologically-based pharmacokinetic (PBPK) models. The process of translating the abstract mathematics of a PBPK mode...
Dose attenuation with depth in an absorber of on-axis bremsstrahlung generated from an electron target is measured and shown to agree within (plus minus)9% with Monte Carlo predictions as a function of absorber material (Al, Fe, Pb) and incident electron-...
In the timeframe following the September 11th attacks on the United States, increased emphasis has been placed on Chemical, Biological, Radiological and Nuclear (CBRN) preparedness. Of prime importance is rapid field assessment of potential radiation expo...
Purpose: To investigate the feasibility of replacing pretreatment verification with in vivo electronic portal imaging device (EPID) dosimetry for prostate intensity-modulated radiotherapy (IMRT). Methods and Materials: Dose distributions were reconstructed from EPID images, inside a phantom (pretreatment) or the patient (five fractions in vivo) for 75 IMRT ...
Comparisons of reaction-rate calculations with absolute dosimetry measurements in the EBR-II blanket are made for /sup 235/U/sub f/, /sup 239/Pu/sub f/, /sup 238/U/sub f/, and /sup 238/U/sub c/ reactions.
Thermoluminescent dosimetric topaz properties have been investigated and the results have shown that this mineral presents characteristics of a good dosimeter mainly in doses evaluation in radiotherapy with photons beams in radiotherapy. Typical applications of thermoluminescent dosimeters in radiotherapy are: in vivo dosimetry on patients (either as a routine quality ...
The authors describe the equipment and methods of calculation used for a system of automatic conversational dosimetry with a mini-computer. They present the dialogue of the physician with the calculator and indicate the conditions they required of such a system: i.e. rapidity of response, simplicity of use, verification of data, precision, adaptability. ...
MAXIGASP and POPGASP are environmental dosimetry codes that are based on the NRC dispersion module, XOQDOQ, and the NRC dosimetry module, GASPAR. XOQDOQ and GASPAR have been verified previously. The four remaining modules of MAXIGASP and POPGASP control input/output functions and data transfer. The results of MAXIGASP and POPGASP have been verified by ...
The radiation produced by a 15.5-MeV monoenergetic electron beam incident on optimized and nonoptimized bremsstrahlung targets is characterized using the ITS Monte Carlo code and measurements with equilibrated and non-equilibrated TLD dosimetry. Compariso...
Intensity-modulated radiotherapy treatment demands stringent quality assurance and accurate dose determination for delivery of highly conformal dose to the patients. Generally 3D dose distributions obtained from a treatment planning system have to be verified by dosimetric methods. Mainly, a comparison of two-dimensional calculated and measured data in several coplanar planes is performed. In ...
Electronic portal imaging devices (EPIDs) were introduced originally for patient position verification. The idea of using EPIDs for dosimetry was realised in the 1980s. Little was published on the topic until the mid 1990's, when the interest in EPIDs for dosimetry increased rapidly and continues to grow. The increasing research on ...
The aim of this study was to demonstrate how dosimetry with an amorphous silicon electronic portal imaging device (a-Si EPID) replaced film and ionization chamber measurements for routine pre-treatment dosimetry in our clinic. Furthermore, we described how EPID dosimetry was used to solve a clinical problem. IMRT prostate plans were ...
The dosimetry of 106Ru/106Rh beta-emitting eye applicators is still inadequate. Manufacturer's specifications of absolute dose rates are loaded with a +/- 30% error, and the relative distribution of activity on the surface is measured on a few points only, using a 3-mm plastic scintillation probe. While reducing the absolute error of ...
Current knowledge on the dosimrietry of fast electrons is reviewed. Definitions of absorbed dose, energy dose, and specific dose are presented. Some methods for absolute and relative dose measurements are discussed. Some calculations for detemination of the absolute dose according to the Bragg-Gray principle are presented. (M.C.G.)
The paper deals with the main means of the beam intensity modifications that are used in radio therapeutic praxis. Physical principles and the main characteristics of the physical wedges and the enhanced dynamic wedges (EDW) are described. The main advantages and the disadvantages of the EDW over the conventional physical wedges are listed. The paper describes also a process of ...
The feasibility of using the PRESAGE/Optical-CT system for 3D dosimetry verification around a brachytherapy source is investigated. Method and Materials: Brachytherapy dose distributions were obtained by irradiation of cylindrical PRESAGE volumes 6cm in diameter by 8cm height with a GammaMed 12i Ir-192 HDR unit (Varian Medical Systems). A narrow channel on ...
The subject of this work concerns with the measurement of absolute calibration factors for the use of CR-39 as an absolute detector in indoor daughters monitoring. Up to now the usefulness of calibration factors was restricted to environmental conditions ...
Recently the EDR2 (extended dose range) film has been introduced commercially for applications in radiation therapy dosimetry. In addition to characterizing the wide dynamic range, several authors have reported a reduced energy dependence of this film compared to that of X-Omatic Verification (XV) films for megavoltage photon beams. However, those ...
For more than 60 years, natural radiation has offered broad opportunities for basic research as evidenced by many fundamental discoveries. Within the last decade, however, dramatic changes have occurred in the motivation and direction of this research. The urgent need for economical energy sources entailing acceptably low levels of environmental impact has compelled the applied aspects of our ...
Criteria for the validation and verification of experimental and evaluated covariance data are reviewed. Three of them - 1) conservation laws in statistical processing, 2) criterion of the positive definiteness for covariance matrices, 3) consistency between the shapes of experimental uncertainties and a model function - are applied for the validation and ...
Purpose: To extend the Radiological Physics Centre (RPC) intensity-modulated radiation therapy dose verification protocol to three dimensions using optical computed tomography (CT) scans of ferrous xylenol-orange (FX) gels. Methods and Materials: The dosimetry insert in the RPC head-and-neck phantom was replaced with an FX cylindrical gel dosimeter. Two ...
The limitations of conventional dosimeters restrict the comprehensiveness of verification that can be performed for advanced radiation treatments presenting an immediate and substantial problem for clinics attempting to implement these techniques. In essence, the rapid advances in the technology of radiation delivery have not been paralleled by corresponding advances in the ...
Two types of radiochromic films (RCF) were characterized for this work: EBT and XRQA film. Both films were investigated for: radiation interaction with film structure; light interaction with film structure for optimal film readout (densitometry) sensitivity; range of absorbed dose measurements; dependence of film dose measurement response as a function of changing radiation energy; fractionation ...
Purpose:To investigate the optimal sensitometric curves of extended dose range (EDR2) radiographic film in terms of depth, field size, dose range and processing conditions for dynamic intensity modulated radiation therapy (IMRT) dosimetry verification with 6 MV X-ray beams.Materials and methods:A Varian Clinac 23 EX linear accelerator with 6 MV X-ray beam ...
Intensity modulated radiation therapy (IMRT) has evolved toward the use of many small radiation fields, or "beamlets," to increase the resolution of the intensity map. The size of smaller beamlets can be typically about 1-5 cm2. Therefore small ionization chambers (IC) with sensitive volumes < or = 0.1 cm3 are generally used for dose verification of IMRT treatment. The ...
In this study, the thermoluminescence (TL) yield of Ge-doped optical fibres for in vitro dosimetry has been investigated for the verification of Intensity Modulated Radiation Therapy (IMRT) three-dimensional (3D) dose distributions. Ge-doped optical fibres offer many advantages over conventional dosimetry systems including high ...
Separation of the most significant components of the environmental radiation field is now, possible through the development of a new method of environmental meson dosimetry. Since this method allows absolute and simultaneous measurement of both gamma and meson dose, it offers particularly cogent advantages for environmental applications. ...
Various methods of dosimetry for protons with energies up to 25 MeV were compared for radiation fields as might be used in the skin treatment of patients or in biological experiments. The methods used were: Fluence of individually registered protons; Charge deposition in commercially available ionisation chambers; Thermoluminescence detectors, exposed in Munich and evaluated ...
A computerized system for beta dosimetry has been developed at the Divisione di Metrologia e Protezione delle Radiazioni Ionizzanti dell'ENEA Italian Agency for (New Technologies, Energy and Environment)di Bologna. The system allows an absolute measuremen...
The Canadian National Calibration Reference Center (NCRC) for Bioassay and In Vivo Monitoring is part of the Radiation Protection Bureau, Health Canada. The NCRC operates three performance testing programs that are designed to confirm that workplace monitoring results are accurate and provide the necessary external verification that is part of a comprehensive quality assurance ...
The Hanford Internal Dosimetry Program has adopted the computer code IMBA (Integrated Modules for Bioassay Analysis) as its primary code for bioassay data evaluation and dose assessment using methodologies of ICRP Publications 60, 66, 67, 68, and 78. The adoption of this code was part of the implementation plan for the June 8, 2007 amendments to 10 CFR 835. This information ...
During the last 10 years, radiation therapy technologies have gone through major changes, mainly related introduction of sophisticated delivery and imaging techniques to improve the target localization accuracy and dose conformity. While implementation of these emerging technologies such as image-guided SRS/SBRT, IMRT/IMAT, IGRT, 4D motion management, and special delivery technologies showed ...
In-phantom Fricke-xylenol orange-gelatin (FXG) gel dosimetry yields three dimensional (3D) dose data for intensity modulated radiation therapy (IMRT) treatment plan verification within 18�24 hours from the point of request. The information obtained from a 3% dose difference, 3 mm distance-to-agreement gamma function comparison between treatment plan dose ...
In recent years there has been a large amount of research into the potential use of radiation sensitive gels for three-dimensional verification of clinical radiotherapy doses. In this paper we report the use of a MAGIC gel dosimeter (Fong et al 2001 Phys. Med. Biol. 46 3105) for the verification of a specific patient's radiation therapy dose distribution. ...
The authors developed a three-dimensionally movable phantom system (3D movable phantom system) which can reproduce three-dimensional movements to experimentally verify the impact of radiotherapy treatment-related movements on dose distribution. The phantom system consists of three integrated components: a three-dimensional driving mechanism (3D driving mechanism), computer control system, and ...
This method describes the use of solid-state track recorders (SSTR) for neutron dosimetry in light-water reactor (LWR) applications. These applications include pressure-vessel surveillance as well as reactor test-region irradiations. An ASTM standard procedure has already been written for SSTR dosimetry. This method can be regarded as a follow-on procedure ...
Increasingly, hemibody and total body irradiation are used to treat systemic and disseminated diseases. Certain dosimetry considerations are common to conventional treatments at short source-to-axis distances and large field treatments at extended treatment distances. These dosimetry considerations include: irradiation geometry, dose rates or outputs in ...
In radiation therapy, an accurate dose determination and a precise dose delivery to the tumour are directly associated with better treatment outcomes in terms of higher tumour control and lower post radiation therapy complications. Over the years, film dosimetry was developed into a powerful tool for radiotherapy treatment verification and quality ...
For many years authorities have been concerned about irradiated food being on the market without clearance and appropriate approval. Now, while the practical utilization of radiation processing of food is growing, detection of illegally irradiated food is no longer the main challenge to authorities. The task of official control of food irradiation and the available tools of ...
