Results 21 to 30 of about 525 (147)

Comparison of liver stereotactic body radiotherapy plans based on free breathing and averaged CTs after trans-arterial chemoembolization using lipiodol. [PDF]

J Appl Clin Med Phys
Abstract Purpose To identify which CT set is more suitable for predicting the four‐dimensional (4D) cumulative dose distribution in liver stereotactic body radiotherapy (SBRT) with lipiodol retention. Methods For 15 patients, who underwent liver SBRT after trans‐arterial chemoembolization (TACE), volumetric modulated arc therapy (VMAT) plans were ...
Kang SK, Yoon JW, Kim MY, Park S, Cheong KH, Koo T, Han TJ.   +6 more
europepmc   +2 more sources

Commissioning and verification of a 3D Monte Carlo independent calculation software for O-ring linac systems. [PDF]

J Appl Clin Med Phys
Abstract Background O‐ring linac systems improve radiotherapy efficiency but require rigorous pretreatment verification due to increased delivery uncertainty in IMRT/VMAT. Existing methods face limitations: measurement‐based approaches incur setup errors, while calculation‐based methods (e.g., Monte Carlo) need machine‐specific validation per AAPM TG ...
Meng X, Dong T, Liang Y, Zhou Z, Wang Z, Qiu J, Zhao J, Zhang Z, Li W, Yang B.   +9 more
europepmc   +2 more sources

Characterization of a 0.5 × 0.5 mm plastic scintillating detector for small field dosimetry: Its performance and comparison with other commercially available plastic scintillating detectors. [PDF]

J Appl Clin Med Phys
Abstract Background Lack of an ideal detector for small field dosimetry has led to the development of many new types of detectors. Recent studies have shown that plastic scintillation detectors (PSDs) provide favorable dosimetric characteristics, such as minimal volume averaging and fluence perturbation effects, real time response rates, high signal to
Baradaran-Ghahfarokhi M, Grees B, Cooney A, Northern E, Ding G, Luo G, Homann K.   +6 more
europepmc   +2 more sources

High spatial resolution dosimetry for radiation oncology with "MagicPlates," a new 976-pixel monolithic silicon detector. [PDF]

J Appl Clin Med Phys
Abstract Purpose We introduce the next generation of “MagicPlate” 2D monolithic pixelated semiconductor detectors – MagicPlate‐976 (MP976). It features a larger array area, higher spatial resolution, and does not require external triggering. We perform a comprehensive characterization for small‐field steep‐dose‐gradient dosimetry applications in ...
Filipev I, Alnaghy S, Carolan M, Paino J, Petasecca M, Cutajar D, Poder J, Davies JB, Oborn BM, Hardcastle N, Guatelli S, Lerch M, Kron T, Rosenfeld A.   +13 more
europepmc   +2 more sources

Monte Carlo modeling of radiation dose from radiation therapy with superficial x-rays. [PDF]

J Appl Clin Med Phys
Abstract Introduction Superficial x‐rays (50–100 kVp) are used for treating non‐melanoma skin cancer and intraoperative radiation therapy (IORT). At these energies, the photoelectric effect significantly increases absorbed dose to bone compared to soft tissue.
Barghash R, Martin TW, Prebble AR, Leary D.   +3 more
europepmc   +2 more sources

A Monte Carlo model of an agility head for a 10-MV photon beam

Journal of Taibah University for Science, 2022
Objective: Modelling linear accelerator (linac) photon beams using the Monte Carlo (MC) technique is presently the most precise technique with which to calculate radiotherapy beam data.
Turki Almatani, Richard P. Hugtenburg, Artjoms Smakovs   +2 more
doaj   +1 more source

Modeling a complex micro-multileaf collimator using the standard BEAMnrc distribution. [PDF]

Medical physics, 2010
The component modules in the standard BEAMnrc istribution may appear to be insufficient to model micro-multileaf collimators that have trifaceted leaf ends and complex leaf profiles. This note indicates, however, that accurate Monte Carlo simulations of radiotherapy beams defined by a complex collimation device can be completed using BEAMnrc's standard
T, Kairn, J, Kenny, S B, Crowe, A L, Fielding, R D, Franich, P N, Johnston, R T, Knight, C M, Langton, D, Schlect, J V, Trapp   +9 more
openaire   +4 more sources

Clinical performance of a shielded diode for small field relative dosimetry in a 1.5 T MRI-linac using measurements and simulations. [PDF]

Med Phys
Abstract Background Small field dosimetry on magnetic‐resonance (MR) guided linear accelerators (linacs) has become increasingly more important for accurate beam modeling due to the increase in the number of patients and variety of disease sites treated on MR‐linacs such as those with small fields.
Ferris WS, Czarnecki D, St-Aubin JJ, Hyer DE.   +3 more
europepmc   +2 more sources

Analysis and evaluation of secondary photons originated in jaws as contamination particles at the phantom surface [PDF]

Ядерна фізика та енергетика, 2020
The present work is focused on the study of the geometry and material of a beam modifier (jaws), which is crucial for Linac improvement by reducing secondary photons emergent from it.
Mohamed Bencheikh, Abdelmajid Maghnouj, Jaouad Tajmouati   +2 more
doaj   +1 more source

Evaluation of the RtDosePlan Treatment Planning System using Radiochromic Film and Monte Carlo Simulation [PDF]

Iranian Journal of Medical Physics, 2010
Introduction: GafChromic EBT films are one of the self-developing and modern films commercially available for dosimetric verification of treatment planning systems (TPSs).
Micaeil Mollazadeh, Mahmood Allahverdi, Tayyeb Allahverdi Pourfallah, Nader Riahi Alam, Mohammadreza Ay   +4 more
doaj   +1 more source