A5068314802- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Digital Radiography and Breast Imaging
- Medical Imaging Techniques and Applications
- Radioactivity and Radon Measurements
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear and radioactivity studies
- Nuclear reactor physics and engineering
- Radiology practices and education
- Boron Compounds in Chemistry
- VLSI and Analog Circuit Testing
- Acute Lymphoblastic Leukemia research
- Healthcare cost, quality, practices
- Wireless Body Area Networks
- Exercise and Physiological Responses
- Bartonella species infections research
- Hematopoietic Stem Cell Transplantation
- Management of metastatic bone disease
- Traumatic Ocular and Foreign Body Injuries
- Myeloproliferative Neoplasms: Diagnosis and Treatment
- Radiation Effects in Electronics
- AI in cancer detection
UK Health Security Agency
2022-2024
Tygerberg Hospital
2024
Stellenbosch University
2024
Public Health England
2015-2021
Delft University of Technology
2005-2017
Institute of Physics
2013
Devon History Society
2009
National Institute for Radiological Protection
2009
Ghent University
2006
Hackensack University Medical Center
2002
To investigate the impact of evolving International Commission on Radiological Protection (ICRP) recommendations concerning calculation effective dose (E) and compare updated typical UK values for common CT examinations with previous data.Monte Carlo simulations have provided normalized organ doses relating to 15 scanner models 5 virtual reference adults. Series representative E/dose-length product (DLP) coefficients were derived separate bases not only older stylized mathematical phantoms...
The consideration of risks from medical diagnostic x-ray examinations and their justification commonly relies on estimates effective dose, although the quantity is actually a health-detriment-weighted summation organ/tissue-absorbed doses rather than measure risk. In its 2007 Recommendations, International Commission Radiological Protection (ICRP) defines dose in relation to nominal value stochastic detriment following low-level exposure 5.7 × 10-2Sv-1, as an average over both sexes, all...
Until recently, for mammography Mo anode - filter x-ray tube assemblies were almost exclusively used. Modern units provide the possibility to employ a variety of combinations with aim adapting spectrum compressed breast thickness and composition. The present contribution provides information on radiation exposure two large groups patients (one 1678 one 945 women) who mammographed modern equipment, dosimetry necessary evaluation.
In interventional radiology, for an accurate determination of effective dose to the staff, measurements with two dosemeters have been recommended, one located above and under protective apron. Such 'double dosimetry' practices algorithms used were reviewed in this study by circulating a questionnaire extensive literature search. The results indicated that regulations double dosimetry almost do not exist there is no firm consensus on most suitable calculation algorithms. mainly based single...
The purpose of this study was to make an inventory the radiation dose from CT in Netherlands and relate way examination performed. Details were obtained approximately 3000 examinations carried out 18 hospitals (22 scanners). Effective calculated for each using CTDI-to-effective conversion factors. For most scanners, factors available literature, some they had be derived with a computer model Monte Carlo algorithm. data on effective dose, parameters patient population are presented per...
It is generally recognised that the CT dose index (CTDI) methodology developed for single-slice scanners [1] flawed wide-beam systems.In this commentary, dosimetry working party of Institute Physics and Engineering in Medicine (IPEM) appraises two alternatively published protocols systems presents its recommendations on most practical method UK.
To obtain a high accuracy in the dosimetry of an epithermal neutron beam used for boron capture therapy (BNCT), sensitivity dosimeters applied to determine various dose components in-phantom has been investigated. The thermal Mg(Ar) ionization chambers, TE(TE) and thermoluminescent (TLD) experimentally determined "pure" beam. Values much higher than theoretically expected were obtained variation up factor 2.5 was found between values different chambers same type. chamber intermediate fast...
The incidence and clinical relevance of tumor cells contaminating the stem cell products patients with advanced breast cancer treated high-dose chemotherapy is uncertain because prior studies used small sample sizes lacked standardization immunocytochemistry (ICC) detection method used. We evaluated blood bone marrow samples obtained from 535 women metastatic who received unmanipulated mobilized support. Of tested, 20.6% 26.3% had contamination, respectively. Blood contamination was...
The nationwide breast cancer screening programme using mammography has been in full operation Netherlands since 1997. There is concern that the mean glandular doses due to might be differing between different regions of country differences glandularity and compressed thickness. To investigate regional differences, glandularity, thickness dose were determined for individual breasts during at units four locations Netherlands. Differences observed, which could related qualitatively age...
The general-purpose Monte Carlo radiation transport code MCNPX has been used to simulate photon and energy deposition in anthropomorphic phantoms due the x-ray exposure from Philips iCT 256 Siemens Definition CT scanners, together with previously studied General Electric 9800.The was compiled Intel FORTRAN compiler run on a Linux PC cluster.A patch successfully applied reduce computing times by about 4%.The International Commission Radiological Protection (ICRP) recently published Adult Male...
Journal Article Quality control of equipment used in digital and interventional radiology Get access J. Zoetelief, Zoetelief *Corresponding author: j.zoetelief@iri.tudelft.nl Search for other works by this author on: Oxford Academic PubMed Google Scholar R. T. M. van Soldt, Soldt I. Suliman, Suliman Jansen, Jansen H. Bosmans Radiation Protection Dosimetry, Volume 117, Issue 1-3, December 2005, Pages 277–282, https://doi.org/10.1093/rpd/nci739 Published: 03 February 2006
The ImPACT (imaging performance assessment of CT scanners) patient dosimetry calculator is still used world-wide to estimate organ and effective doses (E) for computed tomography (CT) examinations, although the tool based on Monte Carlo calculations reflecting practice in early 1990's. Subsequent developments scanners, definitions E, anthropomorphic phantoms, computers radiation transport codes, have all fuelled an urgent need updated dose conversion factors contemporary CT. A new system...
The nationwide breast cancer screening programme using mammography has been in full operation the Netherlands since 1997. Quality control of assigned to National Expert and Training Centre for Breast Cancer Screening. Limits are set mean glandular dose centre monitors these all facilities engaged programme. This procedure is restricted determination entrance on a 5 cm thick polymethylmethacrylate (PMMA) phantom. compressed estimated from data. Individual breasts may deviate largely this PMMA...
This paper summarizes the results of an intercomparison on use ICRP Reference Computational Phantoms with radiation transport codes, which was organized by EURADOS working group 6. Three exercises are described: exposure to anterior-posterior (AP) photon point source, AP neutron and two typical medical X-ray examinations. The three received 17, 8 solutions, respectively. Participants originated from fifteen different countries, used a wide range Monte Carlo codes. Due difficulties in...
Uranium microparticles (radii: 50 nm–1.25 μm) were modelled surrounded by tissue and exposed to natural background radiation, in order investigate potential dose enhancements from photon interactions. Generally, the results depended on microparticle size. For a 0.5 μm radius an isotropic field, it was found that combined photon/electron doses deposited 1 10 radii shells around raised factors of ∼3.8 ∼1.1, respectively; for typical fluence rate, these would correspond increased energy...
In recent years, boron neutron capture therapy has received renewed interest as new promising compounds and epithermal beams have become available. For establishment of the different dose components in beams, various techniques are applied, including use tissue-equivalent (TE) ionisation chambers for determination intermediate fast dose. This paper is directed towards calculation relative sensitivity TE chambers, kT, free-in-air spectrum at HB11 beam facility High Flux Reactor Petten. The kT...