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radiation dosimetry

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https://www.readbyqxmd.com/read/28937271/assesment-of-radiation-induced-secondary-cancer-risk-in-the-brazilian-population-from-left-sided-breast-3d-crt-using-mcnpx
#1
Bruno Melo Mendes, Bruno Machado Trindade, Telma Cristina Ferreira Fonseca, Tarcisio Passos Ribeiro de Campos
OBJECTIVE: The aim of this work was to simulate a 6MV conventional breast 3D conformational radiotherapy (3D-CRT) with physical wedges (50Gy/25#) in the left breast, calculate the mean absorbed dose in the body organs using robust models and computational tools and estimate the secondary cancer-incidence risk to the Brazilian population. METHODS: The VW female phantom was used in the simulations. PTV was defined in the left breast. The 6MV parallel-opposed fields breast-RT protocol was simulated with MCNPx code...
September 20, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28936898/co-operation-of-employers-in-the-area-of-personal-monitoring-a-commentary-on-bir-guidance-on-the-uk-regulatory-situation
#2
Andy Rogers
The requirement for organisations to co-operate regarding doses to staff who work across organisational boundaries is well established. However, in the field of personal dosimetry there is little guidance as to how to actually achieve legal compliance. Following improvement action in the UK by the regulator, The Health & Safety Executive, a guidance document was developed by the leading professional bodies in this area. This guidance was also commented on by the HSE Specialist Inspectorate (Radiation) enabling the published guidance to represent a compliant standard...
September 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28936897/uk-guidance-on-the-management-of-personal-dosimetry-systems-for-healthcare-staff-working-at-multiple-organisations
#3
Andy Rogers, Claire-Louise Chapple, Maria Murray, David Platton, John Saunderson
There has been concern expressed by the UK regulator, the Health & Safety Executive, regarding the management of occupation dose for healthcare radiation workers who work across multiple organisations. In response to this concern the British Institute of Radiology led a working group of relevant professional bodies to develop guidance in this area. The guidance addresses issues of general system management that would apply to all personal dosimetry systems, regardless of whether or not the workers within that system work across organisational boundaries, along with exploring efficient strategies to comply with legislation where those workers do indeed work across organisational boundaries...
September 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28930093/a-reusable-osl-film-for-2d-radiotherapy-dosimetry
#4
Wouter Crijns, Dirk Adelin Vandenbroucke, Paul Leblans, Tom Depuydt
Purpose Optical stimulated luminescence (OSL) combines reusability, sub-mm resolution, and a linear dose response in a single radiation detection technology. Such a combination is currently lacking in radiotherapy dosimetry. But OSL-films have a strong energy dependent response to keV photons due to a relative high effective atomic number (Zeff). The current work studied the applicability of a 2D OSL-film with a reduced Zeff as (IMRT/VMAT) dosimeter. Methods and Materials Based on their commercial OSL-film experience, Agfa Healthcare N...
September 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28929329/somatic-health-effects-of-chernobyl-30-years-on
#5
REVIEW
Maureen Hatch, Elisabeth Cardis
2016 marked the 30th anniversary of the Chernobyl Nuclear Power Plant accident. We and others wrote reviews for the 25th anniversary. Since then, additional papers have appeared and it seems timely to highlight lessons learned. To present, not a systematic review, but a commentary drawing attention to notable findings. We include not only recent reports and updates on previous results, but key findings from prior Chernobyl studies. The dose-dependent increase in Papillary Thyroid Cancer (PTC) following childhood I-131 exposure in Ukraine and Belarus has now been shown to persist for decades...
September 19, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/28915893/dosimetric-comparison-of-different-treatment-modalities-for-stereotactic-radiotherapy
#6
Shih-Ming Hsu, Yuan-Chun Lai, Chien-Chung Jeng, Chia-Ying Tseng
BACKGROUND: The modalities for performing stereotactic radiotherapy (SRT) on the brain include the cone-based linear accelerator (linac), the flattening filter-free (FFF) volumetric modulated arc therapy (VMAT) linac, and tomotherapy. In this study, the cone-based linac, FFF-VMAT linac, and tomotherapy modalities were evaluated by measuring the differences in doses delivered during brain SRT and experimentally assessing the accuracy of the output radiation doses through clinical measurements...
September 16, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28913158/dosimetry-and-first-human-experience-with-89-zr-panitumumab
#7
Liza Lindenberg, Stephen Adler, Ismail B Turkbey, Francesca Mertan, Anita Ton, Khanh Do, Shivaani Kummar, Esther Mena Gonzalez, Sibaprasad Bhattacharyya, Paula M Jacobs, Peter Choyke
(89)Zr-panitumumab is a novel immuno-PET radiotracer. A fully humanized IgG2 antibody, panitumumab binds with high affinity to the extracellular ligand binding domain of EGFR. Immuno-PET with radiolabeled panitumumab is a non-invasive method that could characterize EGFR expression in tumors and metastatic lesions. It might also assist in selecting patients likely to benefit from targeted therapy as well as monitor response and drug biodistribution for dosing guidance. Our objective was to calculate the maximum dosing for effective imaging with minimal radiation exposure in a small subset...
2017: American Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28910264/estimation-and-comparison-of-the-radiation-effective-dose-during-coronary-computed-tomography-angiography-examinations-on-single-source-64-mdct-and-dual-source-128-mdct
#8
Daryoush Khoramian, Soroush Sistani
GOAL: To estimate and compare the radiation dose associated with coronary computed tomography angiography (CCTA) examinations on two multi-detector CT scanners (MDCT), 64-MDCT and 128-MDCT, in daily practice. METHODS: Scan parameters of 90 patients undergoing retrospective electrocardiographic gating spiral CCTA exam were recorded during a period on a single-source 64-MDCT and a dual-source 128-MDCT, and average scan parameters were derived that were used for dosimetry...
September 14, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28903963/predictors-of-radio-induced-visual-impairment-after-radiosurgery-for-uveal-melanoma
#9
Carmen Rosaria Gigliotti, Giulio Modorati, Maura Di Nicola, Claudio Fiorino, Lucia Alessia Perna, Elisabetta Miserocchi, Alberto Franzin, Piero Picozzi, Angelo Bolognesi, Pietro Mortini, Antonella Del Vecchio, Riccardo Calandrino
AIMS: The aim of the present work is to assess the main predictors of the most clinically relevant radio-induced effects after Gamma Knife stereotactic radiosurgery (GKRS) for uveal melanoma (UM). MATERIALS AND METHODS: Medical records and three-dimensional dosimetry data of critical structures of 66 patients were retrospectively reviewed. Cox's proportional hazard model was used to identify clinical and dosimetric variables as independent risk factor for GKRS-related complications...
September 13, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28891033/targeted-alpha-therapy-of-mcrpc-dosimetry-estimate-of-213-bismuth-psma-617
#10
Clemens Kratochwil, Karl Schmidt, Ali Afshar-Oromieh, Frank Bruchertseifer, Hendrik Rathke, Alfred Morgenstern, Uwe Haberkorn, Frederik L Giesel
PURPOSE: PSMA-617 is a small molecule targeting the prostate-specific membrane antigen (PSMA). In this work, we estimate the radiation dosimetry for this ligand labeled with the alpha-emitter (213)Bi. METHODS: Three patients with metastatic prostate cancer underwent PET scans 0.1 h, 1 h, 2 h, 3 h, 4 h and 5 h after injection of (68)Ga-PSMA-617. Source organs were kidneys, liver, spleen, salivary glands, bladder, red marrow and representative tumor lesions...
September 11, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28887589/assessment-of-ct-dose-to-the-fetus-and-pregnant-female-patient-using-patient-specific-computational-models
#11
Tianwu Xie, Pierre-Alexandre Poletti, Alexandra Platon, Christoph D Becker, Habib Zaidi
PURPOSE: This work provides detailed estimates of the foetal dose from diagnostic CT imaging of pregnant patients to enable the assessment of the diagnostic benefits considering the associated radiation risks. MATERIALS AND METHODS: To produce realistic biological and physical representations of pregnant patients and the embedded foetus, we developed a methodology for construction of patient-specific voxel-based computational phantoms based on existing standardised hybrid computational pregnant female phantoms...
September 8, 2017: European Radiology
https://www.readbyqxmd.com/read/28887398/-64-cucl2-pet-ct-in-prostate-cancer-relapse
#12
Arnoldo Piccardo, Francesco Paparo, Matteo Puntoni, Sergio Righi, Gianluca Bottoni, Lorenzo Bacigalupo, Silvia Zanardi, Andrea DeCensi, Giulia Ferrarazzo, Monica Gambaro, Filippo Grillo Ruggieri, Fabio Campodonico, Laura Tomasello, Luca Timossi, Simona Sola, Egesta Lopci, Manlio Cabria
To evaluate the biodistribution, kinetics and radiation dosimetry of (64)CuCl2 in humans and to assess the ability of (64)CuCl2-PoPET/CT to detect prostate cancer (PCa) recurrence in patients with biochemical relapse. Methods: we prospectively evaluated 50 PCa patients with biochemical relapse after surgery or external-beam radiation therapy. All patients underwent (64)CuCl2-PET/CT, (18)F-Choline-PET/CT and multiparametric magnetic resonance imaging (mpMRI) within 15 days of each other. Experienced readers interpreted the images, and the detection rate (DR) of each imaging modality was calculated...
September 8, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28877344/development-of-a-3d-remote-dosimetry-protocol-compatible-with-mrgimrt
#13
Stewart Mein, Leith Rankine, John Adamovics, Harold Li, Mark Oldham
PURPOSE: To develop a novel remote 3D dosimetry protocol to verify Magnetic Resonance-guided Radiation Therapy (MRgRT) treatments. The protocol was applied to investigate the accuracy of TG-119 IMRT irradiations delivered by the MRIdian(®) system (ViewRay(®) , Oakwood Village, Ohio) allowing for a 48 hour delay between irradiation at a field institution and subsequent readout at a base institution. METHODS: The 3D dosimetry protocol utilizes a novel formulation of PRESAGE(®) radiochromic dosimeters developed for high post-irradiation stability and compatibility with optical-CT readout...
September 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28869617/a-phase-1-trial-of-90-y-zevalin-radioimmunotherapy-with-autologous-stem-cell-transplant-for-multiple-myeloma
#14
A Dispenzieri, A D'Souza, M A Gertz, K Laumann, G Wiseman, M Q Lacy, B LaPlant, F Buadi, S R Hayman, S K Kumar, D Dingli, W J Hogan, S M Ansell, D A Gastineau, D J Inwards, I N Micallef, L F Porrata, P B Johnston, M R Litzow, T E Witzig
This phase 1 study (clinical trial NCT00477815) was conducted to determine the maximum tolerated dose (MTD) of yttrium-90 ibritumomab tiuxetan ((90)Y-Zevalin) with high dose melphalan (HDM) therapy in multiple myeloma (MM) patients undergoing autologous stem cell transplantation (ASCT). In a 3+3 trial design, 30 patients received rituximab 250 mg/m(2) with indium-111 ibritumomab tiuxetan ((111)In-Zevalin) for dosimetry (day -22); rituximab 250 mg/m(2) with escalating doses of (90)Y-Zevalin (day -14); melphalan 100 mg/m(2) (days -2,-1) followed by ASCT (day 0) and sargramostim (GM-CSF, day 0) until neutrophil engraftment...
September 4, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28869143/a-novel-urethral-sparing-technique-for-high-dose-rate-prostate-brachytherapy-after-transurethral-resection-of-the-prostate
#15
Hiroaki Kunogi, Jason Adam M Cunha, Albert J Chang, Adam J Gadzinski, Katsuto Shinohara, I-Chow Hsu
PURPOSE: The purpose of this study was to assess retrospectively the variability of the urethral dose optimized using a Foley catheter versus urethral contrast injected using a new modified triple-lumen catheter, in CT-based high-dose-rate (HDR) prostate brachytherapy of posttransurethral resection of prostate (TURP) patients. METHODS AND MATERIALS: At our institution, there were six post-TURP patients with prostate carcinoma between July 2014 and April 2016 who underwent transperineal interstitial HDR brachytherapy (16 needles)...
August 28, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28864620/individualized-dosimetry-for-theranostics-necessary-nice-to-have-or-counterproductive
#16
Uta Eberlein, Marta Cremonesi, Michael Lassmann
In 2005, the term theragnostics (theranostics) was introduced for describing the use of imaging for therapy planning in radiation oncology. In nuclear medicine, this expression describes the use of tracers for predicting the absorbed doses in molecular radiotherapy and, thus, the safety and efficacy of a treatment. At present, the most successful groups of isotopes for this purpose are (123)I/(124)I/(131)I, (68)Ga/(177)Lu, and (111)In/(86)Y/(90)Y. The purpose of this review is to summarize available data on the dosimetry and dose-response relationships of several theranostic compounds, with a special focus on radioiodine therapy for differentiated thyroid cancer and peptide receptor radionuclide therapy...
September 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28858854/photon-iso-effective-dose-for-cancer-treatment-with-mixed-field-radiation-based-on-dose-response-assessment-from-human-and-an-animal-model-clinical-application-to-boron-neutron-capture-therapy-for-head-and-neck-cancer
#17
Sara Josefina Gonzalez, Emiliano C C Pozzi, Andrea Monti Hughes, Lucas Provenzano, Hanna Koivunoro, Daniel Germán Carando, Silvia Inés Thorp, Mariana Rosalía Casal, Silva Bortolussi, Verónica A Trivillin, Marcela A Garabalino, Paula Curotto, Elisa M Heber, Gustavo A Santa Cruz, Leena Kankaanranta, Heikki Joensuu, Amanda E Schwint
Boron Neutron Capture Therapy (BNCT) is a treatment modality that combines different radiation qualities. Since the severity of biological damage following irradiation depends on the radiation type, a quantity different from absorbed dose is required to explain effects observed in the clinical BNCT in terms of outcome compared with conventional photon radiation therapy. A new approach for calculating photon iso-effective doses in BNCT was introduced previously. The present work extends this model to include information from dose-response assessments in animal models and humans...
August 31, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28846586/performance-testing-of-selected-types-of-electronic-personal-dosimeters-in-x-and-gamma-radiation-fields
#18
Nikola Kržanović, Miloš Živanović, Olivera Ciraj-Bjelac, Đorđe Lazarević, Sandra Ćeklić, Srboljub Stanković
Electronic personal dosimeters (EPDs) are increasingly being used alongside conventional thermoluminescent dosimeters to measure the dose of legal record in terms of personal dose equivalent. Therefore, it is of great importance to execute performance tests of these dosimeters in photon fields of various energies and at various angles of incidence. This testing is done in order to simulate the behavior of these dosimeters in realistic multidirectional polyenergetic ionizing radiation fields. Tests of accuracy, linearity, energy response, and angular response have been performed on 10 EPDs from multiple manufacturers...
October 2017: Health Physics
https://www.readbyqxmd.com/read/28840141/changing-therapeutic-paradigms-predicting-mcrc-lesion-response-to-selective-internal-radionuclide-therapy-sirt-based-on-critical-absorbed-dose-thresholds-a-case-study
#19
Kathy P Willowson, Elizabeth J Bernard, Richard Maher, Stephen J Clarke, Dale L Bailey
A 65 year old male with metastatic colorectal cancer (mCRC) in the liver was referred for selective internal radionuclide therapy (SIRT) following a history of extensive systemic chemotherapy. (90)Y PET imaging was performed immediately after treatment and used to confirm lesion targeting and measure individual lesion absorbed doses. Lesion dosimetry was highly predictive of eventual response in the follow-up FDG PET performed 8 weeks after therapy. The derived radiation dose map was used to plan a second SIRT procedure aiming to protect healthy liver by keeping absorbed dose below the critical dose threshold, whilst targeting the remaining lesions that had received sub-critical dosing...
2017: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/28837233/real-time-tomosynthesis-for-radiation-therapy-guidance
#20
Scott S Hsieh, Lydia W Ng
PURPOSE: Fluoroscopy has been a tool of choice for monitoring treatments or interventions because of its extremely fast imaging times. However, the contrast obtained in fluoroscopy may be insufficient for certain clinical applications. In stereotactic ablative radiation therapy of the lung, fluoroscopy often lacks sufficient contrast for gating treatment. The purpose of this work is to describe and assess a real-time tomosynthesis design that can produce sufficient contrast for guidance of lung tumor treatment within a small field of view...
August 24, 2017: Medical Physics
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