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https://www.readbyqxmd.com/read/28533634/estimation-of-whole-body-radiation-exposure-to-nuclear-medicine-personnel-during-synthesis-of-177-lutetium-labeled-radiopharmaceuticals
#1
Geetanjali Arora, Rajesh Mishra, Praveen Kumar, Madhav Yadav, Sanjana Ballal, Chandrasekhar Bal, Nishikant Avinash Damle
PURPOSE OF THE STUDY: With rapid development in the field of nuclear medicine therapy, radiation safety of the personnel involved in synthesis of radiopharmaceuticals has become imperative. Few studies have been done on estimating the radiation exposure of personnel involved in the radio labeling of (177)Lu-compounds in western countries. However, data from the Indian subcontinent are limited. We have estimated whole body radiation exposure to the radiopharmacist involved in the labeling of: (177)Lu-DOTATATE, (177)Lu-PSMA-617, and (177)Lu-EDTMP...
April 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28532617/first-french-experiences-of-total-body-irradiations-using-helical-tomotherapy-%C3%A2
#2
R Sun, X Cuenca, R Itti, S Nguyen Quoc, J-P Vernant, J-J Mazeron, C Jenny, M Chea
PURPOSE: Dynamic conformal radiotherapy with helical TomoTherapy(®) (HT) offers a more quantitative paradigm for total body irradiation. Treatment planning, delivery, dose verification of the first French experiences of total body irradiation using helical TomoTherapy(®) are presented. MATERIALS AND METHODS: Patients planned for total body irradiation at our institution from February 2012 to May 2013 were reported. Total body irradiation consisted in a single fraction of 2Gy...
May 19, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/28528720/in%C3%A2-vivo-dosimetry-in-gynecological-applications-a-feasibility-study
#3
Marion P R Van Gellekom, Richard A M Canters, Frank J W M Dankers, Agnes Loopstra, Elzbieta M van der Steen-Banasik, Marie A D Haverkort
PURPOSE: To investigate the feasibility of in vivo dosimetry using microMOSFET dosimeters in patients treated with brachytherapy using two types of gynecological applicators. METHODS AND MATERIALS: In this study, a microMOSFET was placed in an empty needle of an Utrecht Interstitial Fletcher applicator or MUPIT (Martinez Universal Perineal Interstitial Template) applicator for independent verification of treatment delivery. Measurements were performed in 10 patients, with one to three microMOSFETs per applicator and repeated for one to four fractions, resulting in 50 in vivo measurements...
May 18, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28523649/highly-sensitive-detection-of-ionizing-radiations-by-a-photoluminescent-uranyl-organic-framework
#4
Jian Xie, Yaxing Wang, Wei Liu, Xuemiao Yin, Lanhua Chen, Youming Zou, Juan Diwu, Zhifang Chai, Thomas E Albrecht-Schmitt, Guokui Liu, Shuao Wang
Precise detection of low-dose X- and γ-radiations remains a challenge and is particularly important for studying biological effects under low-dose ionizing radiation, safety control in medical radiation treatment, survey of environmental radiation background, and monitoring cosmic radiations. We report here a photoluminescent uranium organic framework, whose photoluminescence intensity can be accurately correlated with the exposure dose of X- or γ-radiations. This allows for precise and instant detection of ionizing radiations down to the level of 10(-4)  Gy, representing a significant improvement on the detection limit of approximately two orders of magnitude, compared to other chemical dosimeters reported up to now...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28511893/assessment-of-the-effectiveness-of-attenuation-of-pb-aprons-by-using-tld-dosimetry-and-monte-carlo-calculations
#5
H Olaya Dávila, J A Díaz Merchán, H R Vega Carrillo, S A Martínez Ovalle
We developed an experimental set-up by using a continuous emission X-ray (Pantak DXT-3000) and three types of Pb aprons, with thicknesses of 0.25, 0.5, and 0.75mm, coated with Mylar fiber on their surface. Aprons were placed at a distance of 2.5m from the focus. Aluminum filtration was performed at the beam output to reproduce the qualities of narrow beams, N40 (Eeffective =33keV), N80 (Eeffective =65keV), and N100 (Eeffective =83keV), according to the ISO standard 4037 (1-3). Each apron was fixed with 10 thermoluminescent dosimeters (TLDs) over its surface, five dosimeters before and five dosimeters after irradiation with X-rays...
May 10, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28511564/head-and-neck-effective-dose-and-quantitative-assessment-of-image-quality-a-study-to-compare-cone-beam-ct-and-multislice-spiral-ct
#6
Cosimo Nardi, Cinzia Talamonti, Stefania Pallotta, Paola Saletti, Linda Calistri, Cesare Cordopatri, Stefano Colagrande
OBJECTIVES: To evaluate the effective dose and image quality of horizontal Cone Beam CT (CBCT) in comparison with Multislice Spiral CT (MSCT) in head, cervical spine, ear and dental arches scans. METHODS: Head and neck Alderson-Rando phantom equipped with seventy-four thermoluminescence dosimeters was exposed according to five different scans in CBCT and four different scans in MSCT. Spatial and contrast resolution, in terms of Modulation Transfer Function (MTF) and Contrast-to-Noise Ratio (CNR), were measured to obtain a quantitative assessment of image quality...
May 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28510538/measuring-and-assessing-individual-external-doses-during-the-rehabilitation-phase-in-iitate-village-after-the-fukushima-daiichi-nuclear-power-plant-accident
#7
Wataru Naito, Motoki Uesaka, Tadahiro Kurosawa, Yujiro Kuroda
After the Fukushima Daiichi Nuclear Power Plant accident in 2011, Iitate village was placed under an evacuation order because the level of radioactive materials drifting from the nuclear plant to the village were above a government-set level for allowing residents to live in the area. The evacuation advisory for most of the village was lifted on March 31, 2017. For displaced residents deciding whether or not to return to their homes, it is important to correctly understand and estimate the realistic individual external doses they will receive after returning to the village...
May 16, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28508844/evaluation-of-the-effect-of-temperature-variation-on-response-of-presage%C3%A2-dosimeter
#8
Bagher Farhood, Davood Khezerloo, Tohid Morteza Zadeh, Hassan Ali Nedaie, Daryoosh Hamrahi, Najimeh Khezerloo
INTRODUCTION: Many factors, such as PRESAGE ® composition, dose rate, energy, and type of radiation, temperature, etc., may effect on PRESAGE ® dosimeter response. The aim of this study was investigating the effect of temperature variation on response of PRESAGE ® solid dosimeter. MATERIALS AND METHODS: In this study, a PRESAGE ® solid detector was fabricated. Ninety-four percent weight polyurethane, 5% weight carbon tetrachloride, and 1% weight leucomalachite green were used...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28508840/comparison-of-beam-hardening-effect-of-physical-and-enhanced-dynamic-wedges-at-bladder-inhomogeneity-using-ebt3-film-dosimeter
#9
Ghazale Geraily, Nooshin Sharafi, Alireza Shirazi, Mahbod Esfehani, Maryam Masoudifar, Blookat Eftekhar Rajab
INTRODUCTION: Using physical wedges (PWs) to modify dose distribution and more homogeneous target coverage is a well-established technique. However, there are many problems with PWs known as beam hardening, which made them problematic. This can be overcome by dynamic wedges which do not filter beam. Comparison of physical properties of physical and enhanced dynamic wedges (EDWs) restricted to homogeneous medium. Hence, the main aim of this study is to compare dosimetric properties of physical and EDWs at bladder inhomogeneous phantom as a most common case implementing wedges...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28499627/clinical-application-of-moskin-dosimeters-to-rectal-wall-in-vivo-dosimetry-in-gynecological-hdr-brachytherapy
#10
M Carrara, A Romanyukha, C Tenconi, D Mazzeo, A Cerrotta, M Borroni, D Cutajar, M Petasecca, M Lerch, J Bucci, A Richetti, S Presilla, C Fallai, G Gambarini, E Pignoli, A Rosenfeld
PURPOSE: Three MOSkins dosimeters were assembled over a rectal probe and used to perform in vivo dosimetry during HDR brachytherapy treatments of vaginal cancer. The purpose of this study was to verify the applicability of the developed tool to evaluate discrepancies between planned and measured doses to the rectal wall. MATERIALS AND METHODS: MOSkin dosimeters from the Centre for Medical Radiation Physics are particularly suitable for brachytherapy procedures for their ability to be easily incorporated into treatment instrumentation...
May 9, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28499488/in%C3%A2-vivo-dosimetry-with-alanine-electron-spin-resonance-dosimetry-to-evaluate-the-urethra-dose-during-high-dose-rate-brachytherapy
#11
Daniela Wagner, Markus Hermann, Andrea Hille
PURPOSE: To determine the dose of the urethra during Ir-192 high-dose-rate brachytherapy in 15 patients, a new detector form developed for in vivo measurements was used as described by Anton et al. 2009. METHODS AND MATERIALS: The detector consists of alanine powder with paraffin as binder which was filled in a shrinkable tube for measurements. The alanine strand so produced was inserted in the foley catheter during high-dose-rate brachytherapy of the prostate...
May 9, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28498969/development-of-isotopically-enriched-boron-doped-alumina-dosimeter-for-thermal-neutrons
#12
Fuminobu Sato, Tatsuro Maekawa, Tomoharu Kariba, Sachie Kusaka, Teruya Tanaka, Isao Murata
A novel optically stimulated luminescence (OSL) detector containing isotopically enriched boron was developed for thermal neutron dosimetry. Alumina containing isotopically enriched boron (Al2O3:B) was synthesised by the sol-gel method. The Al2O3:B was annealed up to ~1800 K. For X-ray diffractometer (XRD) analysis, the diffraction pattern of the Al2O3:B had reflex peaks corresponding to α-Al2O3. The sensitivity of Al2O3:B to photons was slightly 2% of that of a commercial Al2O3:C. The Al2O3:B detector had satisfactory linearity in X-ray dose measurement...
May 12, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28495302/optically-stimulated-luminescence-of-natural-nacl-mineral-from-dead-sea-exposed-to-gamma-radiation
#13
J Roman-Lopez, Y I Piña López, E Cruz-Zaragoza, J Marcazzó
In this work, the continuous wave - optically stimulated luminescence (CW-OSL) emissions of natural salt minerals, collected from Dead Sea in summer of 2015, were studied. The CW-OSL dose response of natural salt showed a linear range between 0.5Gy and 10Gy of gamma radiation of (60)Co. Samples exposed at 3Gy exhibited good repeatability with a variation coefficient of 4.6%. The CW-OSL response as function of the preheating temperature (50-250°C) was analyzed. An increase of 15% of the CW-OSL response was observed in NaCl samples during storage period of 336h...
May 3, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28493150/assessing-liver-proteins-and-enzymes-of-medical-workers-exposed-to-ionizing-radiation-ir
#14
Saman Shahid, Khalid Masood
The cross-sectional study was conducted to examine hepatic function via liver enzymes/proteins assessments, along with the estimation of an inflammatory response from C-reactive protein (CRP)-which is a liver-synthesized protein. The liver function tests with aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP) and bilirubin (BBN), and CRP test were conducted for radiation-exposed workers-REW (n = 32) and radiation-unexposed workers-RUW (n = 21). The annual average effective doses (AAED) were measured from thermoluminescent dosimeter...
May 10, 2017: Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/28488591/red-emission-phosphor-s-brightness-deterioration-by-x-ray-and-brightness-recovery-phenomenon-by-heating
#15
Masaaki Nakamura, Koichi Chida, Yohei Inaba, Ryota Kobayashi, Masayuki Zuguchi
There are no feasible real-time and direct skin dosimeters for interventional radiology. One would be available if there were x-ray phosphors that had no brightness change caused by x-ray irradiation, but the emission of the Y2O3:Eu, (Y, Gd, Eu)BO3, and YVO4:Eu phosphors investigated in our previous study was reduced by x-ray irradiation. We found that the brightness of those phosphors recovered, and the purpose of this study is to investigate their recovery phenomena. It is expected that more kinds of phosphors could be used in x-ray dosimeters if the brightness changes caused by x-rays are elucidated and prevented...
May 10, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28483249/effect-of-gentamicin-and-levels-of-ambient-sound-on-hearing-screening-outcomes-in-the-neonatal-intensive-care-unit-a-pilot-study
#16
Angela C Garinis, Selena Liao, Campbell P Cross, Johnathan Galati, Jessica L Middaugh, Jess C Mace, Anna-Marie Wood, Lindsey McEvoy, Lauren Moneta, Troy Lubianski, Noe Coopersmith, Nicholas Vigo, Christopher Hart, Artur Riddle, Olivia Ettinger, Casey Nold, Heather Durham, Carol MacArthur, Cynthia McEvoy, Peter S Steyger
OBJECTIVE: Hearing loss rates in infants admitted to neonatal intensive care units (NICU) run at 2-15%, compared to 0.3% in full-term births. The etiology of this difference remains poorly understood. We examined whether the level of ambient sound and/or cumulative gentamicin (an aminoglycoside) exposure affect NICU hearing screening results, as either exposure can cause acquired, permanent hearing loss. We hypothesized that higher levels of ambient sound in the NICU, and/or gentamicin dosing, increase the risk of referral on the distortion product otoacoustic emission (DPOAE) assessments and/or automated auditory brainstem response (AABR) screens...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28479873/comparison-of-surface-dose-delivered-by-7%C3%A2-mv-unflattened-and-6%C3%A2-mv-flattened-photon-beams
#17
Ashokkumar Sigamani, Arunai Nambiraj
AIM: The purpose of this study is to determine the central-axis dose in the buildup region and the surface dose delivered by a 6 MV flattened photon beam (6 MV-FB) and a higher energy unflattened (7 MV-FFF) therapeutic photon beam for different-sized square fields with open fields and modifying filters. MATERIALS AND METHODS: The beams are produced by a Siemens Artiste linear accelerator with a NACP-02 ionization chamber and the dose is measured by using GafChromic film and two different, commonly used, dosimeters: a p-type photon semiconductor dosimeter (PFD) and a cylindrical ionization chamber (CC13)...
May 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28477430/sound-levels-in-a-neonatal-intensive-care-unit-significantly-exceeded-recommendations-especially-inside-incubators
#18
J Parra, A de Suremain, F Berne Audeoud, A Ego, T Debillon
AIM: This study measured sound levels in a 2008 built French neonatal intensive care unit (NICU) and compared them to the 2007 American Academy of Pediatrics (AAP) recommendations. The ultimate aim was to identify factors that could influence noise levels. METHODS: The study measured sound in 17 single or double rooms in the NICU. Two dosimeters were installed in each room, one inside and one outside the incubators, and these conducted measurements over a 24-hour period...
May 6, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28469225/editorial-ercp-related-radiation-cataractogenesis-is-it-time-to-be-concerned
#19
Parit Mekaroonkamol, Steven Keilin
With the growing number of fluoroscopic guided endoscopic procedures, radiation-related risk needs to be further assessed. Recent evidence indicates that radiation cataractogenesis occurs at a lower dose threshold than previously believed. While body aprons and thyroid shields are well-established standard protection during fluoroscopy, ocular safety and the use of protective eyewear are not as well defined. This prospective study answered two important questions: Does the standard body dosimeter provide an accurate ocular dosimetry? And what is the time of fluoroscopy needed to warrant using lens protection? It also raises the question whether current guidelines need to be updated...
May 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28469106/in-vitro-dosimetric-study-of-biliary-stent-loaded-with-radioactive-125-i-seeds
#20
Li-Hong Yao, Jun-Jie Wang, Charles Shang, Ping Jiang, Lei Lin, Hai-Tao Sun, Lu Liu, Hao Liu, Di He, Rui-Jie Yang
BACKGROUND: A novel radioactive 125I seed-loaded biliary stent has been used for patients with malignant biliary obstruction. However, the dosimetric characteristics of the stents remain unclear. Therefore, we aimed to describe the dosimetry of the stents of different lengths - with different number as well as activities of 125I seeds. METHODS: The radiation dosimetry of three representative radioactive stent models was evaluated using a treatment planning system (TPS), thermoluminescent dosimeter (TLD) measurements, and Monte Carlo (MC) simulations...
May 5, 2017: Chinese Medical Journal
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