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https://www.readbyqxmd.com/read/28731288/radiation-therapists-perspectives-on-participating-in-research
#1
Georgia K B Halkett, Melissa Berg, Martin A Ebert, David Cutt, Michael Davis, Desley Hegney, Michael House, Michelle Judson, Rachel Kearvell, Michele Krawiec, Leanne Lester, Sharon Maresse, Peter McLoone, Jan McKay
INTRODUCTION: The objectives of this research were to: (1) determine the extent of Australian radiation therapists (RTs) research participation; (2) evaluate the impact of research involvement on career perceptions (3) explore which research topics require investigation and (4) identify benefits and barriers to research participation. METHODS: This study used mixed methods to collect qualitative and quantitative data using an online survey from a larger workforce study of RTs and radiation oncology medical physicists...
July 21, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28722180/a-generic-tg-186-shielded-applicator-for-commissioning-model-based-dose-calculation-algorithms-for-high-dose-rate-192-ir-brachytherapy
#2
Yunzhi Ma, Javier Vijande, Facundo Ballester, Åsa Carlsson Tedgren, Domingo Granero, Annette Haworth, Firas Mourtada, Gabriel Paiva Fonseca, Kyveli Zourari, Panagiotis Papagiannis, Mark J Rivard, Frank André Siebert, Ron S Sloboda, Ryan Smith, Marc J P Chamberland, Rowan M Thomson, Frank Verhaegen, Luc Beaulieu
PURPOSE: A joint working group was created by the American Association of Physicists in Medicine (AAPM), the European Society for Radiotherapy and Oncology (ESTRO), and the Australasian Brachytherapy Group (ABG) with the charge, among others, to develop a set of well-defined test case plans and perform model-based dose calculation algorithms (MBDCA) dose calculations and comparisons. Its main goal is to facilitate a smooth transition from the AAPM Task Group No. 43 (TG-43) dose calculation formalism, widely being used in clinical practice for brachytherapy, to the one proposed by Task Group No...
July 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28709862/1st-european-congress-of-medical-physics-september-1-4-2016-medical-physics-innovation-and-vision-within-europe-and-beyond
#3
EDITORIAL
Virginia Tsapaki, George C Kagadis, Marco Brambilla, Mario Ciocca, Catharine H Clark, Harry Delis, Giovanni Mettivier
Medical Physics is the scientific healthcare profession concerned with the application of the concepts and methods of physics in medicine. The European Federation of Organisations for Medical Physics (EFOMP) acts as the umbrella organization for European Medical Physics societies. Due to the rapid advancements in related scientific fields, medical physicists must have continuous education through workshops, training courses, conferences, and congresses during their professional life. The latest developments related to this increasingly significant medical speciality were presented during the 1st European Congress of Medical Physics 2016, held in Athens, September 1-4, 2016, organized by EFOMP, hosted by the Hellenic Association of Medical Physicists (HAMP), and summarized in the current volume...
July 11, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28708234/physicists-views-on-hadrontherapy-a-survey-of-members-of-the-italian-association-of-medical-physics-aifm
#4
Tommaso Giandini, Chiara Tenconi, Mauro Carrara, Mario Ciocca, Stefania Russo, Costanza M V Panaino, Federica Cattani, Delia Ciardo, Sara Morlino, Barbara Avuzzi, Nice Bedini, Sergio Villa, Giulia Marvaso, Paola Romanelli, Azusa Hasegawa, Barbara Vischioni, Francesca Valvo, Barbara A Jereczek-Fossa, Roberto Orecchia, Riccardo Valdagni, Emanuele Pignoli
BACKGROUND: This study was based on a survey to investigate perceptions of hadrontherapy of the members of the Italian Association of Medical Physics (AIFM). The survey was digitally submitted to the 991 members between the end of January and the beginning of April 2016. METHODS: A 19-item questionnaire was designed focusing on advantages and disadvantages of hadrontherapy, current status and possible future improvements, and need and opportunities for future investments in Italy and abroad...
July 8, 2017: Tumori
https://www.readbyqxmd.com/read/28701662/overview-of-jsps-core-to-core-program-forming-research-and-educational-hubs-of-medical-physics
#5
Masahiko Koizumi, Masaaki Takashina
To foster medical physicists, we introduce the achievement we made since 2011 under the national research project of the Japan Society for the Promotion of Science (JSPS) Core-to-Core program; 'Forming Research and Educational Hubs of Medical Physics.' On this basis and under the JSPS program, we promoted research and educational exchange with Indiana University (IU) in USA, University of Groningen (The UG) in the Netherland and other cooperating institutions such as University of Minnesota (UM).A total of 23 students and researchers were sent...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28688159/aapm-tg-158-measurement-and-calculation-of-doses-outside-the-treated-volume-from-external-beam-radiation-therapy
#6
Stephen F Kry, Bryan Bednarz, Rebecca M Howell, Larry Dauer, David Followill, Eric Klein, Harald Paganetti, Brian Wang, Cheng-Shie Wuu, X George Xu
The introduction of advanced techniques and technology in radiotherapy has greatly improved our ability to deliver highly conformal tumor doses while minimizing the dose to adjacent organs at risk. Despite these tremendous improvements there remains a general concern about doses to normal tissues that are not the target of the radiation treatment; any "non-target" radiation should be minimized as it offers no therapeutic benefit. As patients live longer after treatment, there is increased opportunity for late effects including second cancers and cardiac toxicity to manifest...
July 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28687286/compliance-to-diagnostic-reference-levels-for-radiation-exposure-in-common-radiological-procedures-in-dutch-hospitals-a-nation-wide-survey-carried-out-by-medical-imaging-students
#7
H Bijwaard, G de Vries, J Scheurleer, T Roding, H Erenstein, W Ravensbergen, S Haarmans-Jonkman, F van Welie
INTRODUCTION: In the Netherlands, hospitals have difficulty in implementing the formal procedure of comparing radiation dose values to Diagnostic Reference Levels (DRLs). METHODS: To support the hospitals, train radiography students, and carry out a nationwide dose survey, diagnostic radiography students performed 125 DRL comparisons for nine different procedures in 29 radiology departments. Students were instructed at three Dutch Universities of Applied Sciences with a radiography programme and supervised by medical physicists from the participating hospitals...
August 2017: Radiography
https://www.readbyqxmd.com/read/28681449/proposed-changes-to-the-american-association-of-physicists-in-medicine-governance
#8
EDITORIAL
Todd Pawlicki, Rex G Ayers, Kristy K Brock, Jessica B Clements, Bruce H Curran, James T Dobbins, Ehsan Samei, Ehsan Adams, Melissa Carol Martin, Lisa Schober
No abstract text is available yet for this article.
July 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28677594/optimization-of-imaging-protocols-in-interventional-cardiology-impact-on-patient-doses
#9
José Manuel Ordiales, Eliseo Vano, Juan Manuel Nogales, José Ramos, José Ramón López-Mínguez, Ginés Martínez, Pablo Cerrato, Fernando Alvarez
The purpose of this work is to evaluate the impact of the imaging protocol as part of the optimization of patient doses in interventional cardiology. This paper reports the results of an initial study to refine the existing fluoroscopy and cine settings, evaluates a new imaging protocol by measuring the image quality and phantom entrance air kerma values, and tests the clinical implementation of the new protocol in terms of the reduction in patient doses and the impact on clinical images. The initial study developed a new fluoroscopy mode using 7...
July 5, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28662850/patient-dose-monitoring-systems-a-new-way-of-managing-patient-dose-and-quality-in-the-radiology-department
#10
N Fitousi
PURPOSE: Due to the upcoming European Directive (2013/59/EURATOM) and the increased focus on patient safety in international guidelines and regulations, Patient Dose Monitoring Systems, also called Dose Management Systems (DMS), are introduced in medical imaging departments. This article focusses on the requirements for a DMS, its benefits and the necessary implementation steps. METHOD: The implementation of a DMS can be perceived as a lengthy, yet worthy, procedure: users have to select the appropriate system for their applications, prepare data collection, validate, perform configuration, and start using the results in quality improvement projects...
June 26, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28654572/quantifying-decreased-radiation-exposure-from-modern-ct-scan-technology-and-surveillance-programs-of-germ-cell-tumors
#11
Stephanie A Howard, Michael H Rosenthal, Lei Qin, Shanna A Matalon, Brandon D Bernard, Clair J Beard, Christopher J Sweeney
INTRODUCTION: Upgrading computerized tomography (CT) scanners to iterative reconstruction techniques (IRT) decreases radiation dose. This reduction, combined with changes in surveillance protocols in clinical stage I testicular cancer (CS1TC) measurably decrease the lifetime attributable risk (LAR) of dying of radiation-associated cancer. MATERIALS AND METHODS: This IRB-approved study enrolled 24 CS1TC patients who had CT scans on the same Toshiba Aquilion 64 CT before and after IRT software installation...
June 26, 2017: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28654170/from-electrons-and-nuclei-to-assemblies-of-correlated-atoms
#12
Neil W Ashcroft
What constitutes an atom? The answer may depend on whether you ask a physicist or a chemist. But the complementary views lead to productive overlap in atomic theory. Limiting cases, under high pressures and temperatures, have had a profound impact in a wider context.
June 27, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28653120/automation-of-radiation-treatment-planning-evaluation-of-head-and-neck-cancer-patient-plans-created-by-the-pinnacle-3-scripting-and-auto-planning-functions
#13
Stefan Speer, Andreas Klein, Lukas Kober, Alexander Weiss, Indra Yohannes, Christoph Bert
BACKGROUND: Intensity-modulated radiotherapy (IMRT) techniques are now standard practice. IMRT or volumetric-modulated arc therapy (VMAT) allow treatment of the tumor while simultaneously sparing organs at risk. Nevertheless, treatment plan quality still depends on the physicist's individual skills, experiences, and personal preferences. It would therefore be advantageous to automate the planning process. This possibility is offered by the Pinnacle(3) treatment planning system (Philips Healthcare, Hamburg, Germany) via its scripting language or Auto-Planning (AP) module...
August 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28650819/towards-high-quality-visualization-of-superfluid-vortices
#14
Yulong Guo, Xiaopei Liu, Chi Xiong, Xuemiao Xu, Chi-Wing Fu
Superfluidity is a special state of matter exhibiting macroscopic quantum phenomena and acting like a fluid with zero viscosity. In such a state, superfluid vortices exist as phase singularities of the model equation with unique distributions. This paper presents novel techniques to aid the visual understanding of superfluid vortices based on the state-of-the-art non-linear Klein-Gordon equation, which evolves a complex scalar field, giving rise to special vortex lattice/ring structures with dynamic vortex formation, reconnection, and Kelvin waves, etc...
June 26, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28644913/supplement-2-for-the-2004-update-of-the-aapm-task-group-no-43-report-joint-recommendations-by-the-aapm-and-gec-estro
#15
Mark J Rivard, Facundo Ballester, Wayne M Butler, Larry A DeWerd, Geoffrey S Ibbott, Ali S Meigooni, Christopher S Melhus, Michael G Mitch, Ravinder Nath, Panagiotis Papagiannis
Since publication of the 2004 update to the American Association of Physicists in Medicine (AAPM) Task Group No. 43 Report (TG-43U1) and its 2007 supplement (TG-43U1S1), several new low-energy photon-emitting brachytherapy sources have become available. Many of these sources have satisfied the AAPM prerequisites for routine clinical purposes and are posted on the Brachytherapy Seed Registry managed jointly by the AAPM and the Imaging and Radiation Oncology Core Houston Quality Assurance Center (IROC Houston)...
June 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28643024/automatic-seed-picking-for-brachytherapy-postimplant-validation-with-3d-ct-images
#16
Guobin Zhang, Qiyuan Sun, Shan Jiang, Zhiyong Yang, Xiaodong Ma, Haisong Jiang
PURPOSE: Postimplant validation is an indispensable part in the brachytherapy technique. It provides the necessary feedback to ensure the quality of operation. The ability to pick implanted seed relates directly to the accuracy of validation. To address it, an automatic approach is proposed for picking implanted brachytherapy seeds in 3D CT images. METHODS: In order to pick seed configuration (location and orientation) efficiently, the approach starts with the segmentation of seed from CT images using a thresholding filter which based on gray-level histogram...
June 22, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28630886/review-of-the-current-status-of-radiation-protection-in-diagnostic-radiology-in-africa
#17
REVIEW
Wilbroad Muhogora, Madan M Rehani
The aim of this paper is to review the available published studies from African countries on patient doses and medical radiation protection and identify strengths, weaknesses, and challenges. Papers on radiation doses to patients published until 2016 pertaining to studies in African countries were reviewed. Radiography, interventional radiology, computed tomography (CT), and mammography modalities were covered. In radiography, the entrance surface air kerma values were below the established diagnostic reference levels (DRLs) provided by the International Atomic Energy Agency, European Commission, and National Council on Radiation Protection and Measurements...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28615985/treatment-of-movement-disorders-with-focused-ultrasound
#18
REVIEW
Paul S Fishman, Victor Frenkel
Although the use of ultrasound as a potential therapeutic modality in the brain has been under study for several decades, relatively few neuroscientists or neurologists are familiar with this technology. Stereotactic brain lesioning had been widely used as a treatment for medically refractory patients with essential tremor (ET), Parkinson disease (PD), and dystonia but has been largely replaced by deep brain stimulation (DBS) surgery, with advantages both in safety and efficacy. However, DBS is associated with complications including intracerebral hemorrhage, infection, and hardware malfunction...
2017: Journal of Central Nervous System Disease
https://www.readbyqxmd.com/read/28600849/modified-ideal-observer-model-miom-for-high-contrast-and-high-spatial-resolution-ct-imaging-tasks
#19
Juan P Cruz-Bastida, Daniel Gomez-Cardona, John Garrett, Timothy Szczykutowicz, Guang-Hong Chen, Ke Li
PURPOSE: Although a variety of mathematical observer models have been developed to predict human observer performance for low contrast lesion detection tasks, their predictive power for high contrast and high spatial resolution discrimination imaging tasks, including those in CT bone imaging, could be limited. The purpose of this work was to develop a modified observer model that has improved correlation with human observer performance for these tasks. METHODS: The proposed observer model, referred to as the modified ideal observer model (MIOM), uses a weight function to penalize components in the task function that have less contribution to the actual human observer performance for high contrast and high spatial resolution discrimination tasks...
June 10, 2017: Medical Physics
https://www.readbyqxmd.com/read/28592501/a-physicist-s-quest-in-biology-max-delbr%C3%A3-ck-and-complementarity
#20
Bernard S Strauss
Max Delbrück was trained as a physicist but made his major contribution in biology and ultimately shared a Nobel Prize in Physiology or Medicine. He was the acknowledged leader of the founders of molecular biology, yet he failed to achieve his key scientific goals. His ultimate scientific aim was to find evidence for physical laws unique to biology: so-called "complementarity." He never did. The specific problem he initially wanted to solve was the nature of biological replication but the discovery of the mechanism of replication was made by others, in large part because of his disdain for the details of biochemistry...
June 2017: Genetics
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