Results 21 to 30 of about 264 (113)

3D printing of realistic body phantoms: Comparison of measured and simulated organ doses on the example of a CT scan on a pregnant woman. [PDF]

Med Phys
Abstract Background Medical examinations or treatment of pregnant women using ionizing radiation are sometimes unavoidable. In such cases, the risk of harm to the embryo and fetus after exposure to ionizing radiation must be carefully estimated. However, no commercially available anthropomorphic body phantoms of pregnant women are available for dose ...
Kunert P, Schlattl H, Trinkl S, Honorio da Silva E, Reichert D, Giussani A.   +5 more
europepmc   +2 more sources

Study of out‐of‐field dose in photon radiotherapy: A commercial treatment planning system versus measurements and Monte Carlo simulations

Medical Physics, Volume 47, Issue 9, Page 4616-4625, September 2020., 2020
Purpose An accurate assessment of out‐of‐field dose is necessary to estimate the risk of second cancer after radiotherapy and the damage to the organs at risk surrounding the planning target volume. Although treatment planning systems (TPSs) calculate dose distributions outside the treatment field, little is known about the accuracy of these ...
B. Sánchez‐Nieto, K. N. Medina‐Ascanio, J. L. Rodríguez‐Mongua, E. Doerner, I. Espinoza   +4 more
wiley   +1 more source

Head and Neck Immobilization Masks: Increase in Dose Surface Evaluated by EBT3, TLD‐100 and PBC Method

Precision Radiation Oncology, Volume 4, Issue 3, Page 73-80, September 2020., 2020
Abstract Positioning and immobilization tools are considered essential components of radiotherapy treatments to guarantee that the planned dose distribution can be efficiently reached. However, the benefits brought by their use are met by an apparent increase in the patient skin entrance dose. In the current study, we evaluated the dose surface effects
Arnie Verde Nolasco, Luiz Oliveira de Faria   +1 more
wiley   +1 more source

Determination of surface dose in pencil beam scanning proton therapy

Medical Physics, Volume 47, Issue 5, Page 2277-2288, May 2020., 2020
Purpose/objective Quantification of surface dose within the first few hundred water equivalent µm is challenging. Nevertheless, it is of large interest for the proton therapy community to study dose effects in the skin. The experimental determination is affected by the detector properties, such as the detector volume and material.
A. Kern, C. Bäumer, K. Kröninger, L. Mertens, B. Timmermann, J. Walbersloh, J. Wulff   +6 more
wiley   +1 more source

SciFi detector and associated method for real‐time determination of profile and output factor for small fields in stereotactic radiotherapy

Medical Physics, Volume 47, Issue 4, Page 1930-1939, April 2020., 2020
Purpose For determining small‐field profile and output factor during stereotactic radiotherapy quality assurance (QA) procedures, we propose a novel system based on the scintillating fiber (SciFi) detector with output image acquisition and processing to allow real‐time monitoring of profile and output factor. Materials and methods The employed detector
P. Pittet, J. Esteves, J.‐M. Galvan, G.‐N. Lu, F. Blanc, G. Haefeli, P. Hopchev, S. Rit, L. Desbat, J. Ribouton, P. Jalade   +10 more
wiley   +1 more source

On the acceptance, commissioning, and quality assurance of electron FLASH units

Medical Physics, Volume 52, Issue 2, Page 1207-1223, February 2025.
Abstract Background and purpose FLASH or ultra‐high dose rate (UHDR) radiation therapy (RT) has gained attention in recent years for its ability to spare normal tissues relative to conventional dose rate (CDR) RT in various preclinical trials. However, clinical implementation of this promising treatment option has been limited because of the lack of ...
Allison Palmiero, Kevin Liu, Julie Colnot, Nitish Chopra, Denae Neill, Luke Connell, Brett Velasquez, Albert C. Koong, Steven H. Lin, Peter Balter, Ramesh Tailor, Charlotte Robert, Jean‐François Germond, Patrik Gonçalves Jorge, Reiner Geyer, Sam Beddar, Raphael Moeckli, Emil Schüler   +17 more
wiley   +1 more source

Activation of hip prostheses in high energy radiotherapy and resultant dose to nearby tissue

Journal of Applied Clinical Medical Physics, Volume 18, Issue 2, Page 100-105, March 2017., 2017
Abstract High energy radiotherapy can produce contaminant neutrons through the photonuclear effect. Patients receiving external beam radiation therapy to the pelvis may have high‐density hip prostheses. Metallic materials such as those in hip prostheses, often have high cross‐sections for neutron interaction.
Stephanie Keehan, Ryan L. Smith, Jeremy Millar, Max Esser, Michael L. Taylor, Peta Lonski, Tomas Kron, Rick D. Franich   +7 more
wiley   +1 more source

Passive Dosimeters for Radiation Dosimetry: Materials, Mechanisms, and Applications

Advanced Functional Materials, Volume 34, Issue 41, October 8, 2024.
An insightful overview of different types of passive dosimeters classified according to the response signal, namely electron paramagnetic resonance, electrical, and optical, is presented. The fundamental requirements of dosimeters, the general dosimetry procedure, the working mechanism, the design concept as well as applications of each type of ...
Zetian Yang, Henk Vrielinck, Luiz G. Jacobsohn, Philippe F. Smet, Dirk Poelman   +4 more
wiley   +1 more source

Dose rate conversion coefficients for ocular contamination in nuclear medicine: A Monte Carlo simulation with experimental validation

Medical Physics, Volume 51, Issue 8, Page 5645-5653, August 2024.
Abstract Background Since 2011, the International Commission on Radiological Protection (ICRP) has recommended an annual eye lens dose limit of 20 mSv for radiation workers, averaged over 5 years, with no year exceeding 50 mSv. However, limited research has been conducted on dose rate conversion coefficients (DCCs) for direct contamination of the eye ...
Eva J. I. Hoeijmakers, Kes Hoenen, Matthias Bauwens, Daniëlle B. P. Eekers, Cécile R. L. P. N. Jeukens, Roel Wierts   +5 more
wiley   +1 more source

Future directions on low-energy radiation dosimetry. [PDF]

Sci Rep, 2021
Massillon-Jl G.
europepmc   +1 more source