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https://www.readbyqxmd.com/read/27929511/evaluation-of-dose-area-product-of-common-radiographic-examinations-towards-establishing-a-preliminary-diagnostic-reference-levels-pdrls-in-southwestern-nigeria
#1
Nnamdi N Jibiri, Christopher J Olowookere
In Nigeria, a large number of radiographic examinations are conducted yearly for various diagnostic purposes. However, most examinations carried out do not have records of doses received by the patients, and the employed exposure parameters used are not documented; therefore, adequate radiation dose management is hin-dered. The aim of the present study was to estimate the dose-area product (DAP) of patients examined in Nigeria, and to propose regional reference dose levels for nine common examinations (chest PA, abdomen AP, pelvis AP, lumbar AP, skull AP, leg AP, knee AP, hand AP, and thigh AP) undertaken in Nigeria...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27929503/real-time-in-vivo-dosimetry-for-sbrt-prostate-treatment-using-plastic-scintillating-dosimetry-embedded-in-a-rectal-balloon-a-case-study
#2
Justin L Cantley, Chee-Wai Cheng, Fredrick B Jesseph, Tarun K Podder, Valdir C Colussi, Bryan J Traughber, Lee E Ponsky
A novel FDA approved in vivo dosimetry device system using plastic scintillating detectors placed in an endorectal balloon to provide real-time in vivo dosimetry for prostatic rectal interface was tested for use with stereotactic body radiotherapy (SBRT). The system was used for the first time ever to measure dose during linear accelerator based SBRT. A single patient was treated with a total dose of 36.25 Gy given in 5 fractions. Delivered dose was measured for each treatment with the detectors placed against the anterior rectal wall near the prostate rectal interface...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27929491/validation-of-an-improved-helical-diode-array-and-dose-reconstruction-software-using-tg-244-datasets-and-stringent-dose-comparison-criteria
#3
Saeed Ahmed, Benjamin Nelms, Jakub Kozelka, Geoffrey Zhang, Eduardo Moros, Vladimir Feygelman
The original helical ArcCHECK (AC) diode array and associated software for 3D measurement-guided dose reconstruction were characterized and validated; however, recent design changes to the AC required that the subject be revisited. The most important AC change starting in 2014 was a significant reduction in the overresponse of diodes to scattered radiation outside of the direct beam, accom-plished by reducing the amount of high-Z materials adjacent to the diodes. This change improved the diode measurement accuracy, but in the process invalidated the dose reconstruction models that were assembled based on measured data acquired with the older version of the AC...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27922832/individual-external-dose-monitoring-of-all-citizens-of-date-city-by-passive-dosimeter-5-to-51-months-after-the-fukushima-npp-accident-series-1-comparison-of-individual-dose-with-ambient-dose-rate-monitored-by-aircraft-surveys
#4
Makoto Miyazaki, Ryugo Hayano
Date (da'te) City in Fukushima Prefecture has conducted a population-wide individual dose monitoring program after the Fukushima Daiichi Nuclear Power Plant Accident, which provides a unique and comprehensive data set of the individual doses of citizens. The purpose of this paper, the first in the series, is to establish a method for estimating effective doses based on the available ambient dose rate survey data. We thus examined the relationship between the individual external doses and the corresponding ambient doses assessed from airborne surveys...
December 6, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27922829/a-methodology-to-split-the-total-cumulative-hp-10-dose-into-the-hp-10-i-doses-received-during-various-procedures-performed-by-interventional-cardiologist
#5
Joanna Domienik
The methodology describing how to split the cumulative Hp(10) dose of interventional cardiologists into Hp(10) i doses received during procedures of various types based on procedure-specific ELDO coefficients and Hp(3) doses per procedure is presented. The appropriate equations for Hp(10) i (Hp(10) for procedure type i), depending on the number of various procedure types (i  =  1 … 4) performed by a particular physician, are derived. The methodology can be applied to whole-body doses measured on the lead apron and therefore can be used for optimisation of work practices in those catheterisation labs where routine dosimeter is worn above the apron...
December 6, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27914776/seasonal-variability-of-equilibrium-factor-and-unattached-fractions-of-radon-and-thoron-in-different-regions-of-punjab-india
#6
Komal Saini, Parminder Singh, Prabhjot Singh, B S Bajwa, B K Sahoo
A survey was conducted to estimate equilibrium factor and unattached fractions of radon and thoron in different regions of Punjab state, India. Pin hole based twin cup dosimeters and direct progeny sensor techniques have been utilized for estimation of concentration level of radon, thoron and their progenies. Equilibrium factor calculated from radon, thoron and their progenies concentration has been found to vary from 0.15 to 0.80 and 0.008 to 0.101 with an average value of 0.44 and 0.036 for radon and thoron respectively...
November 30, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27910825/monte-carlo-studies-on-water-and-lif-cavity-properties-for-dose-reporting-quantities-when-using-x-ray-and-brachytherapy-sources
#7
Isabela Soares Lopes Branco, Paula Cristina Guimarães Antunes, Gabriel Paiva Fonseca, Hélio Yoriyaz
Model-based dose calculation algorithms (MBDCAs) are the current tools to estimate dose in brachytherapy, which takes into account heterogeneous medium, therefore, departing from water-based formalism (TG-43). One aspect associated to MBCDA is the choice of dose specification medium since it offers two possibilities to report dose: (a) dose to medium in medium, D m,m; and (b) dose to water in medium, D w,m. The discussion about the preferable quantity to be reported is underway. The dose conversion factors, DCF, between dose to water in medium, D w,m, and dose to medium in medium, D m,m, is based on cavity theory and can be obtained using different approaches...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27908188/polymer-gel-dosimetry-for-measuring-the-dose-near-thin-high-z-materials-irradiated-with-high-energy-photon-beams
#8
Leighton L Warmington, N Gopishankar, John H Broadhurst, Yoichi Watanabe
PURPOSE: To investigate the feasibility of three-dimensional (3D) dose measurements near thin high-Z materials placed in a water-like medium by using a polymer gel dosimeter (PGD) when the medium was irradiated with high energy photon beams. METHODS: PGD is potentially a useful tool for this application because it can record the dose around a small object made of a high-Z material in a continuous 3D medium. In this study, the authors manufactured a methacrylic acid-based normoxic PGD, nMAG...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908183/comment-on-experimental-determination-of-the-ptw-60019-microdiamond-dosimeter-active-area-and-volume-med-phys-43-5205-5212-2016
#9
Pedro Andreo, Hugo Palmans
No abstract text is available yet for this article.
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908168/examining-credentialing-criteria-and-poor-performance-indicators-for-iroc-houston-s-anthropomorphic-head-and-neck-phantom
#10
Mallory E Carson, Andrea Molineu, Paige A Taylor, David S Followill, Francesco C Stingo, Stephen F Kry
PURPOSE: To analyze the most recent results of the Imaging and Radiation Oncology Core Houston Quality Assurance Center's (IROC-H) anthropomorphic head and neck (H&N) phantom to determine the nature of failing irradiations and the feasibility of altering credentialing criteria. METHODS: IROC-H's H&N phantom, used for intensity-modulated radiation therapy credentialing for National Cancer Institute-sponsored clinical trials, requires that an institution's treatment plan agrees within ±7% of measured thermoluminescent dosimeter (TLD) doses; it also requires that ≥85% of pixels pass ±4 mm distance to agreement (7%/4 mm gamma analysis for film)...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908150/response-to-comment-on-experimental-determination-of-the-ptw-60019-microdiamond-dosimeter-active-area-and-volume-%C3%A2-med-phys-43-6667-2016
#11
Marco Marinelli, G Prestopino, C Verona, G Verona-Rinati
No abstract text is available yet for this article.
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27894049/effect-of-co-doping-of-sodium-on-the-thermoluminescence-dosimetry-properties-of-copper-doped-zinc-lithium-borate-glass-system
#12
REVIEW
A Saidu, H Wagiran, M A Saeed, Y S M Alajerami, A B A Kadir
The effect of sodium as a co-dopant on the thermoluminescence (TL) properties of copper-doped zinc lithium borate (ZLB: Cu) subjected to Co-60 gamma radiation is reported in this study. TL intensity is enhanced with the introduction of sodium in ZLB: Cu. The obtained glow curve is simple with a single peak. The annealing procedure and the best heating rate for the proposed thermoluminescent dosimeter (TLD) are established, and the phosphor is reusable. The TL response within the dose range of 0.5-1000Gy is investigated...
October 11, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/27889538/erratum-to-roos-de-keys-nk-kirkwood-id-the-bone-scan-as-a-biological-dosimeter-front-cover-images-with-case-history-pract-radiat-oncol-2016-6-4
#13
EDITORIAL
Daniel E Roos, Robert N Keys, Ian D Kirkwood
No abstract text is available yet for this article.
October 17, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/27888578/clinical-evaluation-of-a-radio-protective-cream-for-the-hands-of-the-pediatric-interventional-cardiologist
#14
Saradha Subramanian, B Rush Waller, Natasha Winders, Lindsey E Bird, Vijaykumar Agrawal, David Zurakowski, Andrew Kuhls-Gilcrist, Ashok Khandkar, Shyam K Sathanandam
OBJECTIVES: The aim of this study was to evaluate the effectiveness of UltraBLOX™ radiation attenuating hand cream during lengthy cardiac catheterization procedures in children. BACKGROUND: The hands of interventional cardiologists receive high doses of radiation due to their proximity to the X-ray beam. Radiation attenuating gloves have about a 26% attenuation rate, but reduce dexterity and tactile sensation. The UltraBLOX™ cream is a new FDA-approved X-ray attenuating cream that can be applied to the operator's hands for radio-protection...
November 26, 2016: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/27886992/characteristics-of-the-narrow-spectrum-beams-used-in-the-secondary-standard-dosimetry-laboratory-at-the-lebanese-atomic-energy-commission
#15
N Melhem, H El Balaa, G Younes, Z Al Kattar
The Secondary Standard Dosimetry Laboratory at the Lebanese Atomic Energy Commission has different calibration methods for various types of dosimeters used in industrial, military and medical fields. The calibration is performed using different beams of X-rays (low and medium energy) and Gamma radiation delivered by a Cesium 137 source. The Secondary Standard Dosimetry laboratory in charge of calibration services uses different protocols for the determination of high and low air kerma rate and for narrow and wide series...
November 24, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27885242/occupational-noise-induced-hearing-loss-in-auto-part-factory-workers-in-welding-units-in-thailand
#16
Apiradee Sriopas, Robert S Chapman, Saravudh Sutammasa, Wattasit Siriwong
OBJECTIVES: Most workers in auto part factories in Thailand are usually exposed to excessive noise in their workplace. This study aimed to assess the level of occupational noise-induced hearing loss and investigate risk factors causing hearing loss in auto part factory workers in the welding units in Thailand. METHODS: This was a cross- sectional study. One hundred eighty subjects were recruited from 356 workers in the welding unit of three factories. Sixty eligible subjects in each factory were selected by systemic random sampling...
November 22, 2016: Journal of Occupational Health
https://www.readbyqxmd.com/read/27885073/evaluation-of-eye-lens-doses-of-interventional-cardiologists
#17
Sumi Yokoyama, Shoichi Suzuki, Hiroshi Toyama, Shinji Arakawa, Satoshi Inoue, Yutaka Kinomura, Ikuo Kobayashi
The effective dose of medical staff members, especially interventional radiologists and cardiologists, is classified as a relatively high level. We measured the dose for interventional cardiologists by using optically stimulated luminescence dosimeters (OSLDs). However, this quantity is not the same as Hp (3). In experiments, the dose at the eye-lens position of a phantom were measured using OSLDs and thermoluminescence dosimeters (TLDs). A conversion factor from dose measured by using TLDs to OSLDs was estimated from these results...
November 24, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27881295/measuring-dose-from-radiotherapy-treatments-in-the-vicinity-of-a-cardiac-pacemaker
#18
Samuel C Peet, Rachael Wilks, Tanya Kairn, Scott B Crowe
This study investigated the dose absorbed by tissues surrounding artificial cardiac pacemakers during external beam radiotherapy procedures. The usefulness of out-of-field reference data, treatment planning systems, and skin dose measurements to estimate the dose in the vicinity of a pacemaker was also examined. Measurements were performed by installing a pacemaker onto an anthropomorphic phantom, and using radiochromic film and optically stimulated luminescence dosimeters to measure the dose in the vicinity of the device during the delivery of square fields and clinical treatment plans...
November 21, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27876480/noise-dosimetry-for-tactical-environments
#19
Christopher J Smalt, Joe Lacirignola, Shakti K Davis, Paul T Calamia, Paula P Collins
Noise exposure and the subsequent hearing loss are well documented aspects of military life. Numerous studies have indicated high rates of noise-induced hearing injury (NIHI) in active-duty service men and women, and recent statistics from the U.S. Department of Veterans Affairs indicate a population of veterans with hearing loss that is growing at an increasing rate. In an effort to minimize hearing loss, the U.S. Department of Defense (DoD) updated its Hearing Conservation Program in 2010, and also has recently revised the DoD Design Criteria Standard Noise Limits (MIL-STD-1474E) which defines allowable noise levels in the design of all military acquisitions including weapons and vehicles...
November 20, 2016: Hearing Research
https://www.readbyqxmd.com/read/27865669/pin-photodiode-performance-comparison-for-dosimetry-in-radiology-applications
#20
Charles N P Oliveira, Helen J Khoury, Edval J P Santos
Performance comparison of selected photodiodes for usage as radiation detectors for radio-protection is presented. In this study, based on the criteria of minimum sensitive area of 5mm(2), minimum half angle 60° and low cost, four commercial photodiodes are selected for evaluation: SFH205, SFH206, BPW34, and BPX90F. Photodiodes are low cost, small volume and lightweight detectors. As an electronic transducer, photodiode detector is an attractive approach for the development of low power portable electronic dosimeter for direct-reading real-time radiation dose measurement...
November 16, 2016: Physica Medica: PM
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