Results 11 to 20 of about 252 (114)

Comparison of organ and effective dose estimations from different Monte Carlo simulation-based software methods in infant CT and comparison with direct phantom measurements. [PDF]

J Appl Clin Med Phys, 2022
Abstract Purpose Computational dosimetry software is routinely used to evaluate the organ and effective doses from computed tomography (CT) examinations. Studies have shown a significant variation in dose estimates between software in adult cohorts, and few studies have evaluated software for pediatric dose estimates.
Lawson M, Berk K, Badawy M, Qi Y, Kuganesan A, Metcalfe P.   +5 more
europepmc   +2 more sources

Accuracy Evaluation of Collapsed Cone Convolution Superposition Algorithms for the Nasopharynx Interface in the Early Stage of Nasopharyngeal Carcinoma. [PDF]

Biomed Res Int, 2022
This study combined the use of radiation dosimeteric measurements and a custom‐made anthropomorphic phantom in order to evaluate the accuracy of therapeutic dose calculations at the nasopharyngeal air‐tissue interface. The doses at the nasopharyngeal air‐tissue interface obtained utilizing the Pinnacle and TomoTherapy TPS, which are based on collapsed ...
Lai YC, Hung LC, Jeng CC, Feng CJ, Chang TH, Hsu SM.   +5 more
europepmc   +2 more sources

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

Reproduction of a conventional anthropomorphic female chest phantom by 3D‐printing: Comparison of image contrasts and absorbed doses in CT

Medical Physics, Volume 50, Issue 8, Page 4734-4743, August 2023., 2023
Abstract Background The production of individualized anthropomorphic phantoms via three‐dimensional (3D) printing methods offers promising possibilities to assess and optimize radiation exposures for specifically relevant patient groups (i.e., overweighed or pregnant persons) that are not adequately represented by standardized anthropomorphic phantoms.
Patrizia Kunert, Helmut Schlattl, Sebastian Trinkl, Augusto Giussani, Lea Klein, Martin Janich, Detlef Reichert, Gunnar Brix   +7 more
wiley   +1 more source

Radiation field and dose inhomogeneities using an X‐ray cabinet in radiation biology research

Medical Physics, Volume 48, Issue 12, Page 8140-8151, December 2021., 2021
Abstract Purpose X‐ray cabinets are replacing 137Cs/60Co sources in radiation biology research due to advantages in size, handling, and radiation protection. However, because of their different physical properties, X‐ray cabinets are more susceptible to experimental influences than conventional sources.
Martin Bucher, Sebastian Trinkl, David Endesfelder, Tina Weiss, Maria Gomolka, Juliane Pätzold, Ursula Lechel, Ute Roessler, Hugo de las Heras Gala, Simone Moertl, Augusto Giussani   +10 more
wiley   +1 more source

Dosimetry on first clinical dark‐field chest radiography

Medical Physics, Volume 48, Issue 10, Page 6152-6159, October 2021., 2021
Abstract Purpose The purpose of this study was to evaluate the dose characteristic for patient examinations at the first clinical X‐ray dark‐field chest radiography system and to determine whether the effective patient dose is within a clinically acceptable dose range.
Manuela Frank, Theresa Urban, Konstantin Willer, Wolfgang Noichl, Fabio De Marco, Rafael Schick, Bernhard Gleich, Alexander Schegerer, Ursula Lechel, Pascal Meyer, Juergen Mohr, Thomas Koehler, Andre Yaroshenko, Ingo Maack, Thomas Pralow, Roland Proksa, Bernhard Renger, Peter Noël, Alexander Fingerle, Daniela Pfeiffer, Ernst Rummeny, Julia Herzen, Franz Pfeiffer   +22 more
wiley   +1 more source

Technical Note: On the feasibility of performing dosimetry in target and organ at risk using polymer dosimetry gel and thermoluminescence detectors in an anthropomorphic, deformable, and multimodal pelvis phantom

Medical Physics, Volume 48, Issue 9, Page 5501-5510, September 2021., 2021
Abstract Objective To assess the feasibility of performing dose measurements in the target (prostate) and an adjacent organ at risk (rectum) using polymer dosimetry gel and thermoluminescence detectors (TLDs) in an anthropomorphic, deformable, and multimodal pelvis phantom (ADAM PETer).
Mathieu Marot, Alina Elter, Philipp Mann, Andrea Schwahofer, Clemens Lang, Wibke Johnen, Stefan A. Körber, Bettina Beuthien‐Baumann, Clarissa Gillmann   +8 more
wiley   +1 more source

Shielding effect of a lead apron on the peripheral radiation dose outside the applicator of electron beams from an Elekta linear accelerator

Journal of Applied Clinical Medical Physics, Volume 22, Issue 1, Page 327-336, January 2021., 2021
Abstract Purpose To evaluate the shielding effect of lead aprons (LAs) on peripheral radiation doses outside the applicator of electron beams from a linear accelerator. Methods Out‐of‐field radiation doses of 4‐, 6‐, 8‐, 10‐, 12‐, and 15‐MeV electron beams from an Elekta Synergy linear accelerator (linac) were measured by thermoluminescence dosimeters (
Huifang He, Yingdong Zhang, Jidong Wang, Xingyu Chen, Yuyan Yang, Junjie Wang   +5 more
wiley   +1 more source

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