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https://www.readbyqxmd.com/read/28179677/physicists-propose-football-pitch-sized-quantum-computer
#1
Elizabeth Gibney
No abstract text is available yet for this article.
February 1, 2017: Nature
https://www.readbyqxmd.com/read/28170300/effect-of-radiation-dose-reduction-and-reconstruction-algorithm-on-image-noise-contrast-resolution-and-detectability-of-subtle-hypoattenuating-liver-lesions-at-multidetector-ct-filtered-back-projection-versus-a-commercial-model-based-iterative-reconstruction
#2
Justin Solomon, Daniele Marin, Kingshuk Roy Choudhury, Bhavik Patel, Ehsan Samei
Purpose To determine the effect of radiation dose and iterative reconstruction (IR) on noise, contrast, resolution, and observer-based detectability of subtle hypoattenuating liver lesions and to estimate the dose reduction potential of the IR algorithm in question. Materials and Methods This prospective, single-center, HIPAA-compliant study was approved by the institutional review board. A dual-source computed tomography (CT) system was used to reconstruct CT projection data from 21 patients into six radiation dose levels (12...
February 7, 2017: Radiology
https://www.readbyqxmd.com/read/28168673/case-study-iii-the-construction-of-a-nanotoxicity-database-the-mod-enp-tox-experience
#3
Hanne Vriens, Dominik Mertens, Renaud Regret, Pinpin Lin, Jean-Pierre Locquet, Peter Hoet
The amount of experimental studies on the toxicity of nanomaterials is growing fast. Interpretation and comparison of these studies is a complex issue due to the high amount of variables possibly determining the toxicity of nanomaterials.Qualitative databases providing a structured combination, integration and quality evaluation of the existing data could reveal insights that cannot be seen from different studies alone. A few database initiatives are under development but in practice very little data is publicly available and collaboration between physicists, toxicologists, computer scientists and modellers is needed to further develop databases, standards and analysis tools...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28168586/they-tamed-the-photon-early-days-of-radiation-dosimetry
#4
John R Patterson
This article is a tribute to the many physicists who tamed the photon in the service of mankind. Many received Nobel Prizes and other high awards. Several have units named after them. Some invented the equipment we use. Some sacrificed their lives before the hazards and benefits of radiation were fully understood. I discuss the progress over 120 years, both theoretical and technical, in the development of radiation protection regulations based on quantitative measurements and a consistent set of units, the gray and sievert...
February 6, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28152762/ro-ils-radiation-oncology-incident-learning-system-data-trends-2014-2015
#5
Eric C Ford, Nadine L Eads, Ksenija Kapetanovic, Cindy Tomlinson
: 59 Background: Incident learning is one of the most effective ways to improve quality care. To facilitate patient safety improvement at a national level, American Society for Radiation Oncology (ASTRO) and American Association of Physicists in Medicine (AAPM) launched RO-ILS: Radiation Oncology Incident Learning System in June 2014. RO-ILS mission is to facilitate safer and higher quality care through a shared learning environment that is secure and non-punitive. METHODS: To ensure the security and protection of data, ASTRO contracted with Clarity PSO, a federally-certified patient safety organization that operates under the auspices of the Patient Safety and Quality Improvement Act of 2005...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28150796/physicists-doubt-bold-report-of-metallic-hydrogen
#6
COMMENT
Davide Castelvecchi
No abstract text is available yet for this article.
26, 2017: Nature
https://www.readbyqxmd.com/read/28144112/clinical-implementation-of-an-electron-monitor-unit-dosimetry-system-based-on-task-group-71-report-and-a-commercial-calculation-program
#7
Huijun Xu, Mariana Guerrero, Shifeng Chen, Xiaocheng Yang, Karl Prado, Colleen Schinkel
Many clinics still use monitor unit (MU) calculations for electron treatment planning and/or quality assurance (QA). This work (1) investigates the clinical implementation of a dosimetry system including a modified American Association of Physicists in Medicine-task group-71 (TG-71)-based electron MU calculation protocol (modified TG-71 electron [mTG-71E] and an independent commercial calculation program and (2) provides the practice recommendations for clinical usage. Following the recently published TG-71 guidance, an organized mTG-71E databook was developed to facilitate data access and subsequent MU computation according to our clinical need...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28132850/increasing-faculty-participation-in-resident-education-and-providing-cost-effective-self-assessment-module-credit-to-faculty-through-resident-generated-didactics
#8
Hyun Kim, Theresa M Malatesta, Pramila R Anné, John McAna, Voichita Bar-Ad, Adam P Dicker, Robert B Den
PURPOSE/OBJECTIVE(S): Board certified radiation oncologists and medical physicists are required to earn self-assessment module (SAM) continuing medical education (CME) credit, which may require travel costs or usage fees. Data indicate that faculty participation in resident teaching activities is beneficial to resident education. Our hypothesis was that providing the opportunity to earn SAM credit in resident didactics would increase faculty participation in and improve resident education...
December 16, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28128934/synthesis-structure-and-electrochemical-properties-of-k-based-sulfates-k2m2-so4-3-with-m-fe-and-cu
#9
Laura Lander, Gwenaëlle Rousse, Dmitry Batuk, Claire V Colin, Daniel Alves Dalla Corte, Jean-Marie Tarascon
Stabilizing new host structures through potassium extraction from K-based polyanionic materials has been proven to be an interesting approach to develop new Li(+)/Na(+) insertion materials. Pursuing the same trend, we here report the feasibility of preparing langbeinite "Fe2(SO4)3" via electrochemical and chemical oxidation of K2Fe2(SO4)3. Additionally, we succeeded in stabilizing a new K2Cu2(SO4)3 phase via a solid-state synthesis approach. This novel compound crystallizes in a complex orthorhombic structure that differs from that of langbeinite as deduced from synchrotron X-ray and neutron powder diffraction...
January 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28126308/large-scale-retrospective-monte-carlo-dosimetric-study-for-permanent-implant-prostate-brachytherapy
#10
Nelson Miksys, Eric Vigneault, Andre-Guy Martin, Luc Beaulieu, Rowan M Thomson
PURPOSE: To retrospectively compare water-based and full tissue model Monte Carlo dose calculations in a large cohort of patients undergoing (125)I permanent implant prostate brachytherapy. METHODS AND MATERIALS: For 613 patients, EGSnrc BrachyDose dose calculations were performed in 2 virtual patient models: TG43sim (simulated American Association of Physicists in Medicine Task Group Report 43 conditions) and MCref (computed tomography-derived heterogeneous tissue model with interseed effects)...
March 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28115958/failure-mode-and-effects-analysis-of-skin-electronic-brachytherapy-using-esteya-%C3%A2-unit
#11
Blanca Ibanez-Rosello, Juan Antonio Bautista-Ballesteros, Jorge Bonaque, Francisco Celada, Françoise Lliso, Vicente Carmona, Jose Gimeno-Olmos, Zoubir Ouhib, Joan Rosello, Jose Perez-Calatayud
PURPOSE: Esteya(®) (Nucletron, an Elekta company, Elekta AB, Stockholm, Sweden) is an electronic brachytherapy device used for skin cancer lesion treatment. In order to establish an adequate level of quality of treatment, a risk analysis of the Esteya treatment process has been done, following the methodology proposed by the TG-100 guidelines of the American Association of Physicists in Medicine (AAPM). MATERIAL AND METHODS: A multidisciplinary team familiar with the treatment process was formed...
December 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28110384/compass-systems
#12
Nikita Chernetsov
Three compass systems based on global cues known to exist in migrating birds are reviewed. Two of these systems are based on celestial cues, a time-dependent sun compass and time-independent, i.e. not involving the internal clock, star compass. The third system is the magnetic compass, based on a separate sensory modality, which currently attracts much attention from behavioural ecologists, physiologists and physicists. The complex pattern of hierarchy and interactions between these compass systems is briefly discussed...
January 21, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28109632/the-american-college-of-radiology-and-the-american-brachytherapy-society-practice-parameter-for-transperineal-permanent-brachytherapy-of-prostate-cancer
#13
Nathan H J Bittner, Peter F Orio, Gregory S Merrick, Bradley R Prestidge, Alan Charles Hartford, Seth A Rosenthal
Transperineal permanent brachytherapy is a safe and effective treatment option for patients with organ-confined prostate cancer. Careful adherence to established brachytherapy standards has been shown to improve the likelihood of procedural success and reduce the incidence of treatment-related morbidity. A collaborative effort of the American College of Radiology (ACR) and the American Brachytherapy Society (ABS) has produced practice parameters for LDR prostate brachytherapy. These practice parameters define the qualifications and responsibilities of all the involved personnel, including the radiation oncologist, physicist and dosimetrist...
January 2017: Brachytherapy
https://www.readbyqxmd.com/read/28105712/american-association-of-physicists-in-medicine-1631-prince-street-alexandria-va-22314-usa
#14
(no author information available yet)
No abstract text is available yet for this article.
October 2016: Medical Physics
https://www.readbyqxmd.com/read/28076938/transmission-electron-microscopy-for-nanomedicine-novel-applications-for-long-established-techniques
#15
REVIEW
Manuela Malatesta
During the last twenty years, the research in nanoscience and nanotechnology has dramatically increased and, in the last decade, the interest has progressively been oriented towards biomedical applications, giving rise to a new field termed nanomedicine. Transmis - sion electron microscopy is a valuable technique not only for the thorough physico-chemical characterization of newly synthesized nanoparticulates, but especially to explore the effects of nanocomposites on biological systems, providing essential information for the development of efficient therapeutic and diagnostic strategies...
December 9, 2016: European Journal of Histochemistry: EJH
https://www.readbyqxmd.com/read/28074545/development-and-testing-of-a-database-of-nih-research-funding-of-aapm-members-a-report-from-aapm-working-group-for-the-development-of-a-research-database-wgdrd
#16
Brendan Whelan, Eduardo Moros, Rebecca Fahrig, James Deye, Thomas Yi, Michael Woodward, Paul Keall, Jeff Siewerdsen
PURPOSE: To produce and maintain a database of National Institutes of Health (NIH) funding of American Association of Physicists in Medicine (AAPM) members, to perform a top level analysis of this data, and to make this data (hereafter referred to as the AAPM research database) available for the use of the AAPM and its members. METHODS: NIH funded research dating back to 1985 is available for public download through the NIH exporter website, and AAPM membership information dating back to 2002 was supplied by the AAPM...
January 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28067975/assessment-of-acute-thermal-damage-volumes-in-muscle-using-magnetization-prepared-3d-t2-weighted-imaging-following-mri-guided-high-intensity-focused-ultrasound-therapy
#17
Robert M Staruch, Joris Nofiele, Jamie Walker, Chenchen Bing, Ananth J Madhuranthakam, April Bailey, Young-Sun Kim, Avneesh Chhabra, Dennis Burns, Rajiv Chopra
PURPOSE: To evaluate magnetization-prepared 3D T2 -weighted magnetic resonance imaging (MRI) measurements of acute tissue changes produced during ablative MR high-intensity focused ultrasound (MR-HIFU) exposures. MATERIALS AND METHODS: A clinical MR-HIFU system (3T) was used to generate thermal lesions (n = 24) in the skeletal muscles of three pigs. T1 -weighted, 2D T2 -weighted, and magnetization-prepared 3D T2 -weighted sequences were acquired before and after therapy to evaluate tissue changes following ablation...
January 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28060423/famous-medical-physicists-often-get-more-credit-for-discoveries-due-to-their-fame-than-less-prominent-scientists-who-may-have-contributed-as-much-or-earlier-to-these-developments
#18
Clive Baldock, L John Schreiner, Colin G Orton
Medical physics is a rapidly developing, technologically dependent, field. New discoveries are being made almost daily, as demonstrated by papers in this and other similar journals. Many of the authors are early in their careers. Some are concerned, however, that more famous medical physicists often get credit for discoveries due to their fame rather than less prominent scientists who may have, in fact, contributed more to the development in question. This is the claim debated in this month's Point/Counterpoint...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28048913/mo-de-bra-02-simac-a-simulation-tool-for-teaching-linear-accelerator-physics
#19
M Carlone, N Harnett, W Harris, B Norrlinger, M MacPherson, M Lamey, R Anderson, M Oldham
PURPOSE: The first goal of this work is to develop software that can simulate the physics of linear accelerators (linac). The second goal is to show that this simulation tool is effective in teaching linac physics to medical physicists and linac service engineers. METHODS: Linacs were modeled using analytical expressions that can correctly describe the physical response of a linac to parameter changes in real time. These expressions were programmed with a graphical user interface in order to produce an environment similar to that of linac service mode...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048892/su-f-j-116-clinical-experience-based-verification-and-improvement-of-a-4dct-program
#20
P Fogg, M West, T Aland
PURPOSE: To demonstrate the role of continuous improvement fulfilled by the Medical Physicist in clinical 4DCT and CBCT scanning. METHODS: Lung (SABR and Standard) patients' 4D respiratory motion and image data were reviewed over a 3, 6 and 12 month period following commissioning testing. By identifying trends of clinically relevant parameters and respiratory motions, variables were tested with a programmable motion phantom and assessed. Patient traces were imported to a motion phantom and 4DCT and CBCT imaging were performed...
June 2016: Medical Physics
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