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https://www.readbyqxmd.com/read/28930093/a-reusable-osl-film-for-2d-radiotherapy-dosimetry
#1
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/28929295/characterization-of-phenolic-pellets-for-esr-dosimetry-in-photon-beam-radiotherapy
#2
Salvatore Gallo, Giuseppina Iacoviello, Salvatore Panzeca, Ivan Veronese, Antonio Bartolotta, Daniele Dondi, Anna Maria Gueli, Gianfranco Loi, Anna Longo, Eleonora Mones, Maurizio Marrale
This work deals with the dosimetric features of a particular phenolic compound (IRGANOX 1076(®)) for dosimetry of clinical photon beams by using electron spin resonance (ESR) spectroscopy. After the optimization of the ESR readout parameters (namely modulation amplitude and microwave power) to maximise the signal without excessive spectrum distortions, basic dosimetric properties of laboratory-made phenolic dosimeters in pellet form, such as reproducibility, dose-response, sensitivity, linearity and dose rate dependence were investigated...
September 19, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28928180/a-cross-sectional-study-in-a-tertiary-care-hospital-in-china-noise-or-silence-in-the-operating-room
#3
Xiaoxiao Wang, Lin Zeng, Gang Li, Mao Xu, Bin Wei, Yan Li, Nan Li, Liyuan Tao, Hua Zhang, Xiangyang Guo, Yiming Zhao
OBJECTIVES: This study aims to provide a comprehensive description of noise levels in operating rooms (ORs) in a tertiary care hospital in China. Additionally, the study aims to examine the deviation in noise levels from international and internal standards as well as the differences in noise levels by category of surgery and day of the week. METHODS: We monitored noise levels in 23 ORs in a tertiary care hospital in China between August 2015 and March 2016. Dosimeters were used to determine noise levels...
September 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28915893/dosimetric-comparison-of-different-treatment-modalities-for-stereotactic-radiotherapy
#4
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/28905514/dosimetric-characterization-of-gms-bt-125-1-125-i-radioactive-seed-with-monte-carlo-simulations-and-experimental-measurement
#5
Nan Zhao, Ruijie Yang, Li Ren, Yi Fan, Junli Li, Jianguo Zhang
PURPOSE: To investigate the dosimetric characteristics of the new GMS BT-125-1 (125) I radioactive seed, including dose rate constant, radial dose functions, and anisotropy functions. METHODS: Dosimetric parameters of GMS BT-125-1 (125) I seed including dose rate constant, radial dose functions, and anisotropy functions were calculated using the Monte Carlo code of MCNP5, and measured with thermoluminescent dosimeters (TLDs). The results were compared with those of PharmaSeed BT-125-1, PharmaSeed BT-125-2 (125) I, and model 6711 (125) I seeds...
September 14, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28893700/comparison-of-radiation-exposure-during-endovascular-treatment-of-peripheral-arterial-disease-with-flat-panel-detectors-on-mobile-c-arm-vs-fixed-systems
#6
Marie Guillou, Blandine Maurel, Hatem Necib, Pierre-Alexandre Vent, Alain Costargent, Philippe Chaillou, Yann Gouëffic, Adrien Kaladji
PURPOSE: Flat-panel detectors on mobile C-arm (MC-arm) systems are currently challenging fixed C-arm (FC-arm) systems used in hybrid operating rooms. MC-arm systems offer an alternative to FC-arm systems in the endovascular treatment of peripheral arterial disease (PAD) but their efficiency has not been evaluated comparatively. METHODS: Two series of patients undergoing arteriography with intention to treat were included. Each series consisted of two non-randomized groups: an MC-arm group and an FC-arm group...
September 8, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28893002/interventional-angiography-radiation-protection-for-the-examiner-by-using-lead-free-gloves
#7
Peter Kamusella, Fabian Scheer, Christopher Wilhelm Lüdtke, Philipp Wiggermann, Christian Wissgott, Reimer Andresen
INTRODUCTION: The radiation exposure to unprotected parts of the body requires special attention for the interventional radiologist. During angiographic procedures, hands are exposed to the direct X-ray beam and scattered radiation. AIM: The aim of the study was to evaluate the radiation exposure of examiners hand with the use of lead-free X-ray protective gloves in clinical practice in terms of shielding and sense of touch. The aim of the study was to evaluate the radiation exposure of examiners hand with the use of lead-free X-ray protective gloves in clinical practice in terms of shielding and sense of touch...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28877344/development-of-a-3d-remote-dosimetry-protocol-compatible-with-mrgimrt
#8
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/28875865/predictors-and-correlates-of-serum-25-hydroxyvitamin-d-concentrations-in-young-women-results-from-the-safe-d-study
#9
Emma T Callegari, Suzanne M Garland, Alexandra Gorelik, Nicola J Reavley, John D Wark
Vitamin D deficiency is a global public health concern. Studies of serum 25-hydroxyvitamin D (25(OH)D) determinants in young women are limited and few include objective covariates. Our aims were to define the prevalence of vitamin D deficiency and examine serum 25(OH)D correlates in an exploratory study of women aged 16-25 years. We studied 348 healthy females living in Victoria, Australia, recruited through Facebook. Data collected included serum 25(OH)D assayed by liquid chromatography-tandem MS, relevant serum biochemistry, soft tissue composition by dual-energy X-ray absorptiometry, skin melanin density, Fitzpatrick skin type, sun exposure using UV dosimeters and lifestyle factors...
August 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28862215/small-field-depth-dose-profile-of-6-mv-photon-beam-in-a-simple-air-water-heterogeneity-combination-a-comparison-between-anisotropic-analytical-algorithm-dose-estimation-with-thermoluminescent-dosimeter-dose-measurement
#10
Abhijit Mandal, Chhape Ram, Ankur Mourya, Navin Singh
AIM OF STUDY: To establish trends of estimation error of dose calculation by anisotropic analytical algorithm (AAA) with respect to dose measured by thermoluminescent dosimeters (TLDs) in air-water heterogeneity for small field size photon. MATERIALS AND METHODS: TLDs were irradiated along the central axis of the photon beam in four different solid water phantom geometries using three small field size single beams. The depth dose profiles were estimated using AAA calculation model for each field sizes...
July 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28862202/optical-computed-tomography-in-presage-%C3%A2-three-dimensional-dosimetry-challenges-and-prospective
#11
REVIEW
Davood Khezerloo, Hassan Ali Nedaie, Bagher Farhood, Alireza Zirak, Abbas Takavar, Nooshin Banaee, Isa Ahmadalidokht, Tomas Kron
With the advent of new complex but precise radiotherapy techniques, the demands for an accurate, feasible three-dimensional (3D) dosimetry system have been increased. A 3D dosimeter system generally should not only have accurate and precise results but should also feasible, inexpensive, and time consuming. Recently, one of the new candidates for 3D dosimetry is optical computed tomography (CT) with a radiochromic dosimeter such as PRESAGE®. Several generations of optical CT have been developed since the 90s...
July 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28861052/expose-r2-the-astrobiological-esa-mission-on-board-of-the-international-space-station
#12
Elke Rabbow, Petra Rettberg, Andre Parpart, Corinna Panitz, Wolfgang Schulte, Ferdinand Molter, Esther Jaramillo, René Demets, Peter Weiß, Rainer Willnecker
On July 23, 2014, the Progress cargo spacecraft 56P was launched from Baikonur to the International Space Station (ISS), carrying EXPOSE-R2, the third ESA (European Space Agency) EXPOSE facility, the second EXPOSE on the outside platform of the Russian Zvezda module, with four international astrobiological experiments into space. More than 600 biological samples of archaea, bacteria (as biofilms and in planktonic form), lichens, fungi, plant seeds, triops eggs, mosses and 150 samples of organic compounds were exposed to the harsh space environment and to parameters similar to those on the Mars surface...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28858122/higher-body-weight-and-distant-metastasis-are-associated-with-higher-radiation-exposure-to-the-household-environment-from-patients-with-thyroid-cancer-after-radioactive-iodine-therapy
#13
Sheng-Fong Kuo, Tsung-Ying Ho, Miaw-Jene Liou, Kun-Ju Lin, Ru-Chin Cheng, Sheng-Chieh Chan, Bie-Yui Huang, Soh-Ching Ng, Feng-Hsuan Liu, Hung-Yu Chang, Sheng-Hwu Hsieh, Kun-Chun Chiang, Huang-Yang Chen, Ta-You Lo, Chih-Lang Lin, Jen-Der Lin
There were insufficient data regarding radiation exposure to the household environment from patients with thyroid cancer who received radioactive iodine (RAI) therapy in Asia; we therefore performed the present study at the Chang Gung Memorial Hospital in Keelung, Taiwan.Patients with papillary or follicular thyroid cancer who received 3.7 GBq (100 mCi) RAI were enrolled in this prospective hospital-based study. The enrolled patients were asked to place a thermoluminescent dosimeter in the living room, bedroom, and bathroom of their houses for 4 weeks to measure radiation exposure to the household environment...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28855853/evaluation-of-dose-calculations-accuracy-of-a-commercial-treatment-planning-system-for-the-head-and-neck-region-in-radiotherapy
#14
Mohammad Taghi Bahreyni Toossi, Bagher Farhood, Shokouhozaman Soleymanifard
AIM: The objective was to quantify dose calculation accuracy of TiGRT TPS for head and neck region in radiotherapy. BACKGROUND: In radiotherapy of head and neck cancers, treatment planning is difficult, due to the complex shape of target volumes and also to spare critical and normal structures. These organs are often very near to the target volumes and have low tolerance to radiation. In this regard, dose calculation accuracy of treatment planning system (TPS) must be high enough...
September 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28846586/performance-testing-of-selected-types-of-electronic-personal-dosimeters-in-x-and-gamma-radiation-fields
#15
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/28843371/pencil-beam-algorithms-are-unsuitable-for%C3%A2-proton-dose-calculations-in-lung
#16
Paige A Taylor, Stephen F Kry, David S Followill
PURPOSE: To compare analytic and Monte Carlo-based algorithms for proton dose calculations in the lung, benchmarked against anthropomorphic lung phantom measurements. METHODS AND MATERIALS: A heterogeneous anthropomorphic moving lung phantom has been irradiated at numerous proton therapy centers. At 5 centers the treatment plan could be calculated with both an analytic and Monte Carlo algorithm. The doses calculated in the treatment plans were compared with the doses delivered to the phantoms, which were measured using thermoluminescent dosimeters and film...
June 13, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28841144/radiation-induced-attenuation-of-perfluorinated-polymer-optical-fibers-for-radiation-monitoring
#17
Pavol Stajanca, Katerina Krebber
Due to some of their unique properties, optical fiber dosimeters are attractive and extensively researched devices in several radiation-related areas. This work evaluates the performance and potential of commercial perfluorinated polymer optical fibers (PF-POFs) for radiation monitoring applications. Gamma radiation-induced attenuation (RIA) of two commercial PF-POFs is evaluated in the VIS spectral region. Influence of a dose rate and temperature on RIA measurement is investigated, along with defect stability and measurement repeatability...
August 25, 2017: Sensors
https://www.readbyqxmd.com/read/28837234/a-precision-3d-conformal-treatment-technique-in-rats-application-to-whole-brain-radiotherapy-with-hippocampal-avoidance
#18
Suk W Yoon, Christina K Cramer, Devin A Miles, Michael H Reinsvold, Kyeung M Joo, David G Kirsch, Mark Oldham
PURPOSE: To develop and validate 3D conformal hippocampal sparing whole-brain radiation therapy (HA-WBRT) for Wistar rats utilizing precision 3D printed immobilization and micro-blocks. This technique paves the way for future pre-clinical studies investigating brain treatments that reduce neurotoxicity. METHODS AND MATERIALS: A novel pre-clinical treatment planning and delivery process was developed to enable precision 3D conformal treatment and hippocampal avoidance capability for the Xrad 225cx small animal irradiator...
August 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28829916/in-quest-of-the-alanine-r3-radical-multivariate-epr-spectral-analyses-of-x-irradiated-alanine-in-the-solid-state
#19
Eirik O Jåstad, Turid Torheim, Kathleen M Villeneuve, Knut Kvaal, Eli Olaug Hole, Einar Sagstuen, Eirik Malinen, Cecilia M Futsaether
The amino acid l-α-alanine is the most commonly used material for solid-state Electron Paramagnetic Resonance (EPR) dosimetry, due to the formation of highly stable radicals upon irradiation, with yields proportional to the radiation dose. Two major alanine radical components designated R1 and R2 have previously been uniquely characterized from EPR and electron-nuclear double resonance (ENDOR) studies as well as from quantum chemical calculations. There is also convincing experimental evidence of a third minor radical component R3 and a tentative radical structure has been suggested, even though no well-defined spectral signature has been observed experimentally...
August 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28827277/an-investigation-of-the-predictors-of-photoprotection-and-uvr-dose-to-the-face-in-patients-with-xp-a-protocol-using-observational-mixed-methods
#20
Jessica Walburn, Robert Sarkany, Sam Norton, Lesley Foster, Myfanwy Morgan, Kirby Sainsbury, Vera Araújo-Soares, Rebecca Anderson, Isabel Garrood, Jakob Heydenreich, Falko F Sniehotta, Rute Vieira, Hans Christian Wulf, John Weinman
INTRODUCTION: Xeroderma pigmentosum (XP) is a rare genetic condition caused by defective nucleotide excision repair and characterised by skin cancer, ocular and neurological involvement. Stringent ultraviolet protection is the only way to prevent skin cancer. Despite the risks, some patients' photoprotection is poor, with a potentially devastating impact on their prognosis. The aim of this research is to identify disease-specific and psychosocial predictors of photoprotection behaviour and ultraviolet radiation (UVR) dose to the face...
August 21, 2017: BMJ Open
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