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https://www.readbyqxmd.com/read/28815050/a-case-of-azoospermia-in-a-non-destructive-testing%C3%A2-worker-exposed-to-radiation
#1
Jaechan Park, Sanggil Lee, Chulyong Park, Huisu Eom
BACKGROUND: Interest in radiation-related health problems has been growing with the increase in the number of workers in radiation-related jobs. Although an occupational level of radiation exposure would not likely cause azoospermia, several studies have reported the relation between radiation exposure and azoospermia after accidental or therapeutic radiation exposure. We describe a case of azoospermia in a non-destructive testing (NDT) worker exposed to radiation and discuss the problems of the related monitoring system...
2017: Annals of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28807441/whole-body-dose-and-energy-measurements-in-radiotherapy-by-a-combination-of-lif-mg-cu-p-and-lif-mg-ti
#2
Pascal Hauri, Uwe Schneider
PURPOSE: Long-term survivors of cancer who were treated with radiotherapy are at risk of a radiation-induced tumor. Hence, it is important to model the out-of-field dose resulting from a cancer treatment. These models have to be verified with measurements, due to the small size, the high sensitivity to ionizing radiation and the tissue-equivalent composition, LiF thermoluminescence dosimeters (TLD) are well-suited for out-of-field dose measurements. However, the photon energy variation of the stray dose leads to systematic dose errors caused by the variation in response with radiation energy of the TLDs...
August 11, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28796643/monte-carlo-and-experimental-determination-of-correction-factors-for-gamma-knife-perfexion-small-field-dosimetry-measurements
#3
Emmanouil Zoros, Argyris S Moutsatsos, Eleftherios P Pappas, Evangelos Georgiou, Georgios Kollias, Pantelis Karaiskos, Evaggelos Pantelis
Detector-, field size- and machine-specific correction factors are required for precise dosimetry measurements in small and non-standard photon fields. In this work, Monte Carlo (MC) simulation techniques were used to calculate the correction factors for a series of ionization chambers, a synthetic microDiamond and diode dosimeters, used for reference and/or output factor (OF) measurements in the Gamma Knife Perfexion photon fields. Calculations were performed for the Solid Water (SW) and ABS plastic phantoms, as well as for a water phantom of the same geometry...
August 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28795076/intraoperative-radiation-exposure-during-hip-arthroscopy
#4
John P Salvo, Jake Zarah, Zaira S Chaudhry, Kirsten L Poehling-Monaghan
BACKGROUND: The frequency of hip arthroscopy for the treatment of acute and chronic chondrolabral pathology and femoroacetabular impingement (FAI) has increased exponentially over the past decade. While surgeon and patient radiation exposure has been well documented in other areas of the orthopaedic literature, little is known about the procedure-specific and cumulative doses affecting the hip arthroscopist. PURPOSE: To determine the mean annual radiation exposure to the hip arthroscopist and the mean surgeon exposure per case...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28780202/tailor-made-ge-doped-silica-glass-for-clinical-diagnostic-x-ray-dosimetry
#5
Amjad Alyahyawi, T Jupp, M Alkhorayef, D A Bradley
In the modern clinical practice of diagnostic radiology there is a growing demand for radiation dosimetry, it also being recognized that with increasing use of X-ray examinations additional population dose will result, accompanied by an additional albeit low potential for genetic consequences. At the doses typical of diagnostic radiology there is also a low statistical risk for cancer induction; in adhering to best practice, to be also implied is a low but non-negligible potential for deterministic sensitive organ responses, including in regard to the skin and eyes...
July 22, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28777096/beam-projections-and-radiation-exposure-in-transradial-and-transfemoral-approaches-during-coronary-angiography
#6
Ali Tarighatnia, Amirhossien Mohammadalian, Morteza Ghojazade, Leili Pourafkari, Alireza Farajollahi
OBJECTIVE: We aimed to compare the operator and patient radiation exposure in standard projections during elective diagnostic coronary angiography procedures via transradial (TRA) versus transfemoral (TFA) approaches. METHODS: In this analytical cross-sectional study, a total of 202 consecutive patients who were candidates for diagnostic coronary angiography were randomized to undergo the procedure via TFA or TRA approaches (101 in each group). Patients with abnormal Allen test and history of coronary artery bypass surgery, valvular heart disease, and unsuccessful coronary angiography were excluded from the study...
August 2, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28776454/earmuff-efficacy-in-the-workplace-using-f-mire-a-case-report
#7
Raquel Fornaziero Gomes, Alessandra Giannella Samelli, Sylvio R Bistafa
PURPOSE: To determine the field efficacy of an earmuff used by the employees of a private company. METHODS: Measurements were performed using a double-channel noise dosimeter. Noise levels collected in one-third-octave bands were corrected with the frequency response for diffuse sound field and attenuation was compared with values provided by the manufacturer of the hearing protection device (HPD). RESULTS: Comparisons between the corrected noise reduction and the attenuation provided by the manufacturer of the HPD show no statistically significant differences in attenuation for most frequency bands, with higher mean values for the observed corrected noise reduction...
August 4, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/28766885/technical-note-construction-of-heterogeneous-head-phantom-for-quality-control-in-stereotactic-radiosurgery
#8
Mohsen Najafi, Javad Teimouri, Alireza Shirazi, Ghazaleh Geraily, Mahbod Esfahani, Mostafa Shafaei
PURPOSE: Stereotactic radiosurgery is a high precision modality for conformally delivering high doses of radiation to the brain lesion with a large dose volume. Several studies for the quality control of this technique were performed to measure the dose delivered to the target with a homogenous head phantom and some dosimeters. Some studies were also performed with one or two instances of heterogeneity in the head phantom to measure the dose delivered to the target. But these studies assumed the head as a sphere and simple shape heterogeneity...
August 2, 2017: Medical Physics
https://www.readbyqxmd.com/read/28766828/technical-note-no-increase-in-effective-dose-from-half-compared-to-full-rotation-pelvis-cone-beam-ct
#9
Pascal Hauri, Roger A Hälg, Uwe Schneider
PURPOSE: To image the abdomen of a patient with a gantry mounted imaging system of a linear accelerator, different cone beam computed tomography (CBCT) protocols are available. The whole-body dose of a full rotation abdomen CBCT and a half rotation CBCT was compared. In our clinic, both CBCT protocols are used in daily routine work. METHODS: With an adult anthropomorphic Alderson phantom, the whole-body dose per CBCT scan was measured with thermoluminescence dosimeters...
August 2, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28763418/tracking-cumulative-radiation-exposure-in-orthopaedic-surgeons-and-residents-what-dose-are-we-getting
#10
Elizabeth B Gausden, Alexander B Christ, Roseann Zeldin, Joseph M Lane, Moira M McCarthy
BACKGROUND: The purpose of this study was to determine the amount of cumulative radiation exposure received by orthopaedic surgeons and residents in various subspecialties. We obtained dosimeter measures over 12 months on 24 residents and 16 attending surgeons. METHODS: Monthly radiation exposure was measured over a 12-month period for 24 orthopaedic residents and 16 orthopaedic attending surgeons. The participants wore a Landauer Luxel dosimeter on the breast pocket of their lead apron...
August 2, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28762026/feasibility-of-3d-printed-air-slab-diode-caps-for-small-field-dosimetry
#11
Benjamin Perrett, Paul Charles, Tim Markwell, Tanya Kairn, Scott Crowe
Commercial diode detectors used for small field dosimetry introduce a field-size-dependent over-response relative to an ideal, water-equivalent dosimeter due to high density components in the body of the detector. An air gap above the detector introduces a field-size-dependent under-response, and can be used to offset the field-size-dependent detector over-response. Other groups have reported experimental validation of caps containing air gaps for use with several types of diodes in small fields. This paper examines two designs for 3D printed diode air caps for the stereotactic field diode (SFD)-a cap containing a sealed air cavity, and a cap with an air cavity at the face of the SFD...
July 31, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28758178/exposure-of-medical-staff-to-radiation-during-osteosynthesis-of-proximal-femoral-fracture-descriptive-analysis-and-comparison-of-different-devices
#12
Cédric Siedlecki, Rémi Gauthé, André Gillibert, Kevin Bellenger, Xavier Roussignol, Mourad Ould-Slimane
BACKGROUND: The use of fluoroscopy is necessary during proximal femoral fracture (PFF) osteosynthesis. The frequency of these procedures justifies a description of radiation exposure and comparisons between different techniques and between the different surgical team members. METHODS: This observational prospective and comparative study includes a series of 68 patients with PFF receiving osteosynthesis. Radiation exposure was assessed for all members of the operating team...
July 31, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28752320/polymer-gel-dosimeters-with-pva-ga-matrix
#13
Seyed Mohammad Mahdi Abtahi, Hamid Sadeghi Abandansari
Properties of a new polymer gel with cross-linked polyvinyl alcohol as a gelatinous matrix were investigated. The new polymer gel dosimeter was named PVABAT. The irradiation was performed using a calibrated (60)Co beam. The dose responses of the PVABAT formulations were quantified with MRI transverse relaxation rate (R2) measurements. The results show that the PVABAT gel responds linearly to the absorbed dose for doses from 30 up to 45 Gy. The maximal amount of [Formula: see text] of PVABAT polymer gel dosimeter was about 0...
July 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28749809/beyond-californium-a-neutron-generator-alternative-for-dosimetry-and-instrument-calibration-in-the-u-s
#14
Roman K Piper, Andrey V Mozhayev, Mark K Murphy, Alan K Thompson
Evaluations of neutron survey instruments, area monitors, and personal dosimeters rely on reference neutron radiations, which have evolved from the heavy reliance on (α,n) sources to a shared reliance on (α,n) and the spontaneous fission neutrons of californium-252 (Cf). Capable of producing high dose equivalent rates from an almost point source geometry, the characteristics of Cf are generally more favorable when compared to the use of (α,n) and (γ,n) sources or reactor-produced reference neutron radiations...
September 2017: Health Physics
https://www.readbyqxmd.com/read/28749618/radiation-induced-second-cancer-risk-from-external-beam-photon-radiotherapy-for-head-and-neck-cancer-impact-on-in-field-and-out-of-field-organs
#15
Vasanthan Sakthivel, Ganesh Kadirampatti Mani, Sunil Mani, Raghavendiran Boopathy
The purpose of this paper is to provide data on development of second primary cancers within or adjacent to tissue irradiated in the treatment of primary head and neck cancers using different techniques and modalities. Materials and methods: We selected five patients with HandN tumors located in base of the tongue for risk assessment. In order to examine the impact of choices of various planning techniques, numbers of beams and beam energy used in treatment plans - 7 and 9 field Intensity modulated radiotherapy (IMRT) plans using 6MV and 10 MV beam energies and a 6MV Volumetric modulated arc therapy (VMAT) plans were planned...
July 27, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28739211/investigating-the-surface-dose-contribution-of-intrafractional-kv-imaging-in-cyberknife-based-stereotactic-radiosurgery
#16
Abdulmecit Canbolat, Faruk Zorlu, Pervin Hurmuz, Mete Yeginer, Gokhan Ozyigit
CyberKnife treatment consists of hundreds of noncoplanar beams and numerous intrafractional images that can be taken during a single treatment fraction; thus, doses because of imaging should be considered in this technique. The aim of this study is to investigate the in-field and out-of-field surface doses induced from kV imaging system during stereotactic radiosurgery (SRS) treatment. The imaging-induced surface doses were measured at the center of the imaging field and within ±15-cm distance from the center in both craniocaudal and lateral directions...
July 21, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28735464/radiation-dose-reduction-in-thoracic-and-lumbar-spine-instrumentation-using-navigation-based-on-an-intraoperative-cone-beam-ct-imaging-system-a-prospective-randomized-clinical-trial
#17
Nathalie Pireau, Virginie Cordemans, Xavier Banse, Nadia Irda, Sébastien Lichtherte, Ludovic Kaminski
PURPOSE: Spine surgery still remains a challenge for every spine surgeon, aware of the potential serious outcomes of misplaced instrumentation. Though many studies have highlighted that using intraoperative cone beam CT imaging and navigation systems provides higher accuracy than conventional freehand methods for placement of pedicle screws in spine surgery, few studies are concerned about how to reduce radiation exposure for patients with the use of such technology. One of the main focuses of this study is based on the ALARA principle (as low as reasonably achievable)...
July 22, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28733918/feasibility-of-optimized-ultralow-dose-pulsed-fluoroscopy-for-upper-gastrointestinal-tract-examinations-a-phantom-study-with-clinical-correlation
#18
Jakob Weiss, Andreas Pomschar, Carsten Rist, Klement Neumaier, Minglun Li, Wilhelm Flatz, Kolja Thierfelder, Mike Notohamiprodjo
PURPOSE: To establish an optimized ultralow-dose digital pulsed fluoroscopy (FP) protocol for upper gastrointestinal tract examinations and to investigate the radiation dose and image quality. MATERIALS AND METHODS: An Alderson-Rando-Phantom with 60 thermoluminescent dosimeters was used for dose measurements to systematically evaluate the dose-area product (DAP) and organ doses of the optimized FP protocol with the following acquisition parameters: 86.7 kV; 77 mA; 0...
July 22, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28724867/evaluation-of-the-patient-exposure-in-general-radiography-for-some-facilities-comparison-with-drl-and-evaluation-of-the-difference-among-facilities
#19
Koji Ono, Yuya Kondo, Takuma Ichikawa, Yasuki Asada
The first diagnostic reference levels (DRLs 2015) in Japan were published in June 2015. The purpose of this study was to compare the calculated entrance surface doses with the values of DRLs 2015, and evaluate differences in patient exposure among facilities. Semiconductor dosimeter was installed, and dosimetry was performed using equipment and radiographic condition of each facility. As a result, a dose higher than the value of DRLs 2015 was used in 12 kinds of examination. In child chest examination, the doses of the three facilities (0...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28721441/radiation-dose-to-the-operator-during-fluoroscopically-guided-spine-procedures
#20
Luca Roccatagliata, Stefano Presilla, Emanuele Pravatà, Alessandro Cianfoni
PURPOSE: Fluoroscopy is widely used to guide diagnostic and therapeutic spine procedures. The purpose of this study was to quantify radiation incident on the operator (operator Air Kerma) during a wide range of fluoroscopy-guided spine procedures and its correlation with the amount of radiation incident on the patient (Kerma Area Product-KAP). METHODS: We retrospectively included 57 consecutive fluoroscopically guided spine procedures. KAP [Gy cm(2)] and total fluoroscopy time were recorded for each procedure...
July 18, 2017: Neuroradiology
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