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Radiation, proton therapy

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https://www.readbyqxmd.com/read/29139207/patient-reported-outcomes-of-slow-single-arc-rotation-do-we-need-rotating-gantries
#1
Brendan Whelan, Miriam Welgampola, Leigh McGarvie, Kuldeep Makhija, Robin M Turner, Lois Holloway, Ilana Feain, Michael Jackson, Michael Barton, Paul Keall
INTRODUCTION: Patient rotation could greatly simplify radiation therapy delivery, with particularly important ramifications for fixed beam treatment with protons, heavy ions, MRI-Linacs, and low cost Linacs. Patient tolerance is often cited as a barrier to widespread implementation to patient rotation; however, no quantitative data addressing this issue exists. In this study, patient reported experiences of slow, single arc rotation in upright (sitting) and lying orientations are reported...
November 15, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/29136287/quantification-of-mri-visibility-and-artefacts-at-3t-of-liquid-fiducial-marker-in-a-pancreas-tissue-mimicking-phantom
#2
Sergej Schneider, Rasmus Irming Jølck, Esther Gera Cornelia Troost, Aswin Louis Hoffmann
PURPOSE: X-ray based position verification of the target volume in image-guided radiation therapy (IGRT) of patients with pancreatic ductal adenocarcinoma (PDAC) is currently performed on solid fiducial markers that are implanted under endoscopic ultrasonography. A new biodegradable liquid fiducial marker has recently been introduced. To assess its potential use for magnetic resonance imaging (MRI) guided photon or proton radiotherapy of PDAC, the MRI visibility and artefacts of this marker were quantified and compared against solid gold markers...
November 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/29119856/radiological-properties-of-healthy-carcinoma-and-equivalent-breast-tissues-for-photon-and-charged-particle-interactions
#3
M Büyükyıldız, M Kurudirek
PURPOSE: In this paper, the effective atomic numbers (Zeff), electron densities (Neff), exposure buildup factor (EBF) and energy absorption buildup factor (EABF) of healthy (H), carcinoma (C) and equivalent (E) breast tissues were investigated to quantify differences in radiological parameters between the tissues in the continuous energy region. For these purposes, Zeffs and Neffs, of healthy, carcinoma and equivalent (H-C-E) breast tissues were calculated for interaction of gamma rays and charged particles with selected tissues...
November 9, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29116055/improvement-of-single-detector-proton-radiography-by-incorporating-intensity-of-time-resolved-dose-rate-functions
#4
Rongxiao Zhang, Kyung-Wook Jee, Ethan W Cascio, Gregory C Sharp, Jacob B Flanz, Hsiao-Ming Lu
Proton radiography, which images patients with the same type of particles as what they are to be treated with, is a promising approach to image guidance and water equivalent path length (WEPL) verification in proton radiation therapy. We have shown recently that proton radiographs could be obtained by measuring time-resolved dose rate functions (DRF) using an x-ray amorphous silicon flat panel. The WEPL values were derived solely from the root-mean-square (RMS) of DRFs while the intensity information in the DRFs was filtered out...
November 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29114596/clinical-outcomes-of-intensity-modulated-proton-therapy-and-concurrent-chemotherapy-in-esophageal-carcinoma-a-single-institutional-experience
#5
Anussara Prayongrat, Cai Xu, Heng Li, Steven H Lin
Purpose: Intensity-modulated proton therapy (IMPT) is an emerging advanced radiation technique. Although dosimetric studies demonstrate the superiority of IMPT for improving target conformity and reducing unnecessary dose to critical normal tissues, clinical experience is limited. We aim to describe our preliminary experience implementing IMPT concurrently with chemotherapy in esophageal carcinoma (EC). Methods and materials: From May 2011 through February 2016, 19 patients with EC (median age, 73 years) were treated with IMPT using 180 to 250 MV protons with a median dose of 50...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29113853/hyperkinetic-transient-ischemic-attacks-preceding-deep-ganglionic-infarction-in-a-patient-with-a-treated-parasellar-chondrosarcoma
#6
Michael W Ruff, Adip G Bhargav, Stephen W English, James P Klaas
A 44-year-old right-handed female with a past medical history of parasellar chondrosarcoma status post-surgical debulking and proton beam therapy (70 Gy) three years prior to presentation experienced several hours of brief, repetitive episodes of transient hemiballism and dystonia; this was followed by abrupt onset of fixed hemiparesis and dysarthria weeks later, ipsilateral to her prior hyperkinetic movements. She was found to have total occlusion of the right middle cerebral artery with focal stenosis of the proximal right A-1 segment of the anterior cerebral artery adjacent to the remnants of the chondrosarcoma...
November 4, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29106564/modelling-recurrence-and-second-cancer-risks-induced-by-proton-therapy
#7
V S K Manem, A Dhawan
In the past few years, proton therapy has taken the centre stage in treating various tumour types. The primary contribution of this study is to investigate the tumour control probability (TCP), relapse time and the corresponding secondary cancer risks induced by proton beam radiation therapy. We incorporate tumour relapse kinetics into the TCP framework and calculate the associated second cancer risks. To calculate proton therapy-induced secondary cancer induction, we used the well-known biologically motivated mathematical model, initiation-inactivation-proliferation formalism...
July 4, 2017: Mathematical Medicine and Biology: a Journal of the IMA
https://www.readbyqxmd.com/read/29104614/proton-radiobiology-and-its-clinical-implications
#8
REVIEW
Bleddyn Jones
Denser ionisation clustering and complex DNA damage in proton Bragg peaks far exceeds that seen with conventional X-rays. This results in more efficient cell sterilisation, quantified by the relative biological effectiveness (RBE). Currently, a 1.1 RBE is used to determine the clinical proton doses by dividing the usual X-rays dose by this amount. This number, derived from short-term experiments, has been criticised as being irrelevant to late normal tissue (NT) effects following radiotherapy and included many control irradiations using lower voltage X-rays (with elevated RBE values) than those used in the clinic...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/29103987/special-radiobiological-features-of-second-cancer-risk-after-particle-radiotherapy
#9
Klaus-Rüdiger Trott
In absolute terms: second cancer risks from radiotherapy of first cancers in adults are small compared to the benefits from radiotherapy but this is not so for radiotherapy of childhood cancers. Moreover, the radiation dose dependence of cancer induction differs between organs and tissues. The organ-specific dose dependence of second cancer risks may indicate the existence of different radiobiological mechanisms. As an inevitable consequence of the age dependence of organ sensitivity to second cancer induction, the organ/tissue weighting factors which have been proposed by ICRP for calculating effective dose (the dose unit Sv) and for risk estimation in the general population should not be used in medical radiation exposures...
November 2, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29089533/proton-minibeam-radiation-therapy-spares-normal-rat-brain-long-term-clinical-radiological-and-histopathological-analysis
#10
Yolanda Prezado, Gregory Jouvion, David Hardy, Annalisa Patriarca, Catherine Nauraye, Judith Bergs, Wilfredo González, Consuelo Guardiola, Marjorie Juchaux, Dalila Labiod, Remi Dendale, Laurène Jourdain, Catherine Sebrie, Frederic Pouzoulet
Proton minibeam radiation therapy (pMBRT) is a novel strategy for minimizing normal tissue damage resulting from radiotherapy treatments. This strategy partners the inherent advantages of protons for radiotherapy with the gain in normal tissue preservation observed upon irradiation with narrow, spatially fractionated beams. In this study, whole brains (excluding the olfactory bulb) of Fischer 344 rats (n = 16) were irradiated at the Orsay Proton Therapy Center. Half of the animals received standard proton irradiation, while the other half were irradiated with pMBRT at the same average dose (25 Gy in one fraction)...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29080006/local-arterial-therapies-in-the-management-of-unresectable-hepatocellular-carcinoma
#11
REVIEW
Samdeep K Mouli, Laura W Goff
Most patients with hepatocellular carcinoma present with intermediate to advanced disease, where curative therapies are no longer an option. These patients with intermediate to advanced disease represent a heterogeneous population with regard to tumor burden, liver function, and performance status. While the Barcelona Clinic Liver Cancer (BCLC) staging system offers guidelines for the management of these patients, strict adherence to these guidelines may limit treatment options for these patients. Several locoregional therapies exist for these patients, including conventional transarterial chemoembolization (cTACE), transarterial embolization (TAE), drug-eluting embolization (DEE), and radioembolization...
October 27, 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/29079119/evaluation-of-stopping-power-prediction-by-dual-and-single-energy-computed-tomography-in-an-anthropomorphic-ground-truth-phantom
#12
Patrick Wohlfahrt, Christian Möhler, Christian Richter, Steffen Greilich
PURPOSE: To determine the accuracy of particle range prediction for proton and heavier ion radiation therapy based on dual-energy computed tomography (DECT) in a realistic inhomogeneous geometry and to compare it with the state-of-the-art clinical approach. METHODS AND MATERIALS: A 3-dimensional ground-truth map of stopping-power ratios (SPRs) was created for an anthropomorphic head phantom by assigning measured SPR values to segmented structures in a high-resolution CT scan...
September 18, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29076458/feasibility-of-mr-only-proton-dose-calculations-for-prostate-cancer-radiotherapy-using-a-commercial-pseudo-ct-generation-method
#13
Matteo Maspero, Cornelis A T Van den Berg, Guillaume Landry, Claus Belka, Katia Parodi, Peter R Seevinck, Bas W Raaymakers, Christopher Kurz
A magnetic resonance (MR)-only radiotherapy workflow can reduce cost, radiation exposure and uncertainties introduced by CT-MRI registration. A crucial prerequisite is generating the so called pseudo-CT (pCT) images for accurate dose calculation and planning. Many pCT generation methods have been proposed in the scope of photon radiotherapy. This work aims at verifying for the first time whether a commercially available photon-oriented pCT generation method can be employed for accurate intensity-modulated proton therapy (IMPT) dose calculation...
October 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29064038/hypofractionated-high-energy-proton-beam-irradiation-is-an-alternative-treatment-for-who-grade-i-meningiomas
#14
Pavlos Vlachogiannis, Olafur Gudjonsson, Anders Montelius, Erik Grusell, Ulf Isacsson, Kristina Nilsson, Erik Blomquist
BACKGROUND: Radiation treatment is commonly employed in the treatment of meningiomas. The aim of this study was to evaluate the effectiveness and safety of hypofractionated high-energy proton therapy as adjuvant or primary treatment for WHO grade I meningiomas. METHOD: A total of 170 patients who received irradiation with protons for grade I meningiomas between 1994 and 2007 were included in the study. The majority of the tumours were located at the skull base (n = 155)...
October 24, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29063837/differences-in-normal-tissue-response-in-the-esophagus-between-proton-and-photon-radiation-therapy-for-non-small-cell-lung-cancer-using-in%C3%A2-vivo-imaging-biomarkers
#15
RANDOMIZED CONTROLLED TRIAL
Joshua S Niedzielski, Jinzhong Yang, Radhe Mohan, Uwe Titt, Dragan Mirkovic, Francesco Stingo, Zhongxing Liao, Daniel R Gomez, Mary K Martel, Tina M Briere, Laurence E Court
PURPOSE: To determine whether there exists any significant difference in normal tissue toxicity between intensity modulated radiation therapy (IMRT) or proton therapy for the treatment of non-small cell lung cancer. METHODS AND MATERIALS: A total of 134 study patients (n=49 treated with proton therapy, n=85 with IMRT) treated in a randomized trial had a previously validated esophageal toxicity imaging biomarker, esophageal expansion, quantified during radiation therapy, as well as esophagitis grade (Common Terminology Criteria for Adverse Events version 3...
November 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29058370/proton-therapy-for-pediatric-head-and-neck-malignancies
#16
Jennifer Vogel, Stefan Both, Maura Kirk, Hann-Hsiang Chao, Rochelle Bagatell, Yimei Li, Richard Womer, Naomi Balamuth, Anne Reilly, Goldie Kurtz, Robert Lustig, Zelig Tochner, Christine Hill-Kayser
PURPOSE: Pediatric head and neck malignancies are managed with intensive multimodality therapy. Proton beam therapy (PBT) may reduce toxicity by limiting exposure of normal tissue to radiation. In this study, we report acute toxicities and early outcomes following PBT for pediatric head and neck malignancies. MATERIALS AND METHODS: Between 2010 and 2016, pediatric patients with nonhematologic malignancies of the head and neck were treated with PBT. Clinical and dosimetric data were abstracted from the medical record and treatment planning system with institutional review board approval...
October 23, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29053837/preliminary-study-of-neutron-field-in-top-implart-proton-therapy-beam
#17
Paolo Ferrari, Monia Vadrucci, Alessandro Ampollini, Lorenzo Campani, Luigi Picardi, Concetta Ronsivalle, Francesca Mariotti
The TOP-IMPLART, a new proton therapy facility, is under development in Frascati ENEA Laboratories, near Rome. The project is centered on a medium-energy proton accelerator designed as a sequence of modular linear accelerators (the final energy will be 230 MeV). Being not a commercial product, measurements and simulation are fundamental to characterize the system and the radiation field, even during its construction. In this work some preliminary evaluations of the neutron contamination have been tried. The simulations were validated through some measurements obtaining a satisfactory agreement...
October 19, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29050959/sequential-proton-boost-after-standard-chemoradiation-for-high-grade-glioma
#18
Sebastian Adeberg, Denise Bernhardt, Semi Ben Harrabi, Matthias Uhl, Angela Paul, Nina Bougatf, Vivek Verma, Andreas Unterberg, Wolfgang Wick, Thomas Haberer, Stephanie E Combs, Klaus Herfarth, Juergen Debus, Stefan Rieken
PURPOSE: To retrospectively assess the feasibility and safety of a sequential proton boost following conventional chemoradiation in high-grade glioma (HGG). METHOD AND MATERIALS: Sixty-six consecutive patients with HGG were treated with 50.0 Gy photons (50.0-50.4 Gy) in 2.0 Gy (1.8-2.0 Gy) fractions, followed by a proton boost with 10 Gy equivalent (Gy(RBE)) in 2.0 Gy(RBE) fractions. Patients were matched one to one with 66 patients with HGG undergoing conventional radiation therapy (RT) with 60...
October 16, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29049739/cataract-avoidance-with-proton-therapy-in-ocular-melanomas
#19
Juliette Thariat, Sophie Jacob, Jean-Pierre Caujolle, Celia Maschi, Stéphanie Baillif, Gaelle Angellier, Thibaud Mathis, Laurence Rosier, Adela Carnicer, Joel Hérault, Julia Salleron
Purpose: The lens is a radiosensitive organ. Any dose of cephalic irradiation can give rise to radiation-induced cataracts. Contrary to other forms of radiotherapy, proton therapy (PT) can spare all or part of the lens due to accurate dose deposition. We investigated whether a lens-sparing approach was relevant to avoid cataracts in uveal melanoma patients. Methods: Patients were referred for PT from onco-ophthalmologists of private and academic institutions. Patients without preexisting cataracts or implants were entered in a prospective database...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29045491/monte-carlo-simulation-of-secondary-neutron-dose-for-scanning-proton-therapy-using-fluka
#20
Chaeyeong Lee, Sangmin Lee, Seung-Jae Lee, Hankyeol Song, Dae-Hyun Kim, Sungkoo Cho, Kwanghyun Jo, Youngyih Han, Yong Hyun Chung, Jin Sung Kim
Proton therapy is a rapidly progressing field for cancer treatment. Globally, many proton therapy facilities are being commissioned or under construction. Secondary neutrons are an important issue during the commissioning process of a proton therapy facility. The purpose of this study is to model and validate scanning nozzles of proton therapy at Samsung Medical Center (SMC) by Monte Carlo simulation for beam commissioning. After the commissioning, a secondary neutron ambient dose from proton scanning nozzle (Gantry 1) was simulated and measured...
2017: PloS One
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