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https://www.readbyqxmd.com/read/28443654/quantifying-the-self-assembly-behavior-of-anisotropic-nanoparticles-using-liquid-phase-transmission-electron-microscopy
#1
Binbin Luo, John W Smith, Zihao Ou, Qian Chen
For decades, one of the overarching objectives of self-assembly science has been to define the rules necessary to build functional, artificial materials with rich and adaptive phase behavior from the bottom-up. To this end, the computational and experimental efforts of chemists, physicists, materials scientists, and biologists alike have built a body of knowledge that spans both disciplines and length scales. Indeed, today control of self-assembly is extending even to supramolecular and molecular levels, where crystal engineering and design of porous materials are becoming exciting areas of exploration...
April 26, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28435986/asian-consortium-on-radiation-dose-of-pediatric-cardiac-ct-asci-redcard
#2
Peter K T Hui, Hyun Woo Goo, Jing Du, Janice J K Ip, Suzu Kanzaki, Young Jin Kim, Supika Kritsaneepaiboon, Oktavia Lilyasari, Suvipaporn Siripornpitak
BACKGROUND: With incremental utilization of pediatric cardiac CT in congenital heart disease, it is imperative to define its current radiation dose levels in clinical practice in order to help imagers optimize CT protocols, particularly in Asia and other developing countries where CT physicists are not readily available. OBJECTIVE: To evaluate current radiation dose levels and influencing factors in cardiac CT in children with congenital heart disease in Asia by conducting a retrospective multi-center, multi-vendor study...
April 24, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28432806/rapid-acceptance-testing-of-modern-linac-using-on-board-mv-and-kv-imaging-systems
#3
Sridhar Yaddanapudi, Bin Cai, Taylor Harry, Steven Dolly, Baozhou Sun, Hua Li, Keith Stinson, Camille Noel, Lakshmi Santanam, Todd Pawlicki, Sasa Mutic, S Murty Goddu
PURPOSE: The purpose of this study was to develop a novel process for using on-board MV and kV Electronic Portal Imaging Devices (EPIDs) to perform linac acceptance testing (AT) for two reasons: 1) to standardize the assessment of new equipment performance, and 2) to reduce the time to clinical use while reducing physicist workload. METHODS AND MATERIALS: In this study, Varian TrueBeam linacs equipped with amorphous silicon based EPID (aS1000) were used. The conventional set of AT tests and tolerances were used as a baseline guide...
April 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28431680/two-paradigms-for-religious-representation-the-physicist-and-the-playground-a-reply-to-levy
#4
Neil Van Leeuwen
In an earlier issue, I argue (2014) that psychology and epistemology should distinguish religious credence from factual belief. These are distinct cognitive attitudes. Levy (2017) rejects this distinction, arguing that both religious and factual "beliefs" are subject to "shifting" on the basis of fluency and "intuitiveness." Levy's theory, however, (1) is out of keeping with much research in cognitive science of religion and (2) misrepresents the notion of factual belief employed in my theory. So his claims don't undermine my distinction...
April 18, 2017: Cognition
https://www.readbyqxmd.com/read/28412135/moving-beyond-quality-control-in-diagnostic-radiology-and-the-role-of-the-clinically-qualified-medical-physicist
#5
REVIEW
H Delis, K Christaki, B Healy, G Loreti, G L Poli, P Toroi, A Meghzifene
Quality control (QC), according to ISO definitions, represents the most basic level of quality. It is considered to be the snapshot of the performance or the characteristics of a product or service, in order to verify that it complies with the requirements. Although it is usually believed that "the role of medical physicists in Diagnostic Radiology is QC", this, not only limits the contribution of medical physicists, but is also no longer adequate to meet the needs of Diagnostic Radiology in terms of Quality...
April 12, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28410688/education-and-training-of-medical-physics-in-iran-the-past-the-present-and-the-future
#6
Seyed Rabi Mahdavi, Behrouz Rasuli, Azam Niroomand-Rad
PURPOSE: The aim of this study was to investigate the current status of education and training programs in medical physics in Iran. METHODS: A questionnaire was designed and sent to 274 IAMP (Iranian Association of Medical Physicists) members focusing on these two topics: the educational situation (course syllabus, number of faculty members, number of PhD and MSc students and sub-fields offered in the department) and the professional situation (work experience, workplaces of medical physicists, postgraduate degrees that were granted and the amount of therapy and imaging equipment)...
April 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28405106/evaluation-of-intensity-modulated-radiation-therapy-delivery-system-using-a-volumetric-phantom-on-the-basis-of-the-task-group-119-report-of-american-association-of-physicists-in-medicine
#7
Raphaela Avgousti, Christina Armpilia, Ioannis Floros, Christos Antypas
The current work describes the implementation of the American Association of Physicists in Medicine (AAPM)'s Task Group 119 report on a volumetric phantom (Delta(4), Scandidos, Uppsala, Sweden) following the stated dose goals, to evaluate the step-and-shoot intensity modulated radiation therapy (IMRT) system. Delta(4) consists of diode detectors, lying on two crossed planes, measuring the delivered dose, and providing two-dimensional dosimetric information. Seven plans of different goals and complexity were performed, with individual structure sets...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28402432/educational-outcomes-of-a-medical-physicist-program-over-the-past-10%C3%A2-years-in-japan
#8
Noriyuki Kadoya, Kumiko Karasawa, Iori Sumida, Hidetaka Arimura, Yasumasa Kakinohana, Shigeto Kabuki, Hajime Monzen, Teiji Nishio, Hiroki Shirato, Syogo Yamada
The promotion plan for the Platform of Human Resource Development for Cancer (Ganpro) was initiated by the Ministry of Education, Culture, Sports, Science and Technology of Japan in 2007, establishing a curriculum for medical physicists. In this study, we surveyed the educational outcomes of the medical physicist program over the past 10 years since the initiation of Ganpro. The Japan Society of Medical Physics mailing list was used to announce this survey. The questionnaire was created by members of the Japanese Board for Medical Physicist Qualification, and was intended for the collection of information regarding the characteristics and career paths of medical physics students...
April 11, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28397710/comparison-of-computed-tomography-shielding-design-methods-using-radshield
#9
Matthew DeLorenzo, Kai Yang, Dee Wu, Weiyuan Wang, I Rutel
PURPOSE: To comprehensively compare four computed tomography (CT) scanner shielding design methods using RadShield, a Java-based Graphical User Interface (GUI). METHODS: RadShield, a floor plan based graphical user interface (GUI), was extended to calculate air kerma and barrier thickness using accepted methods from the National Council on Radiation Protection and Measurements (NCRP), the British Institute of Radiology (BIR), and a method using isodose maps, for spatially distributed points beyond user defined barriers...
April 11, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28397396/insight-gained-from-responses-to-surveys-on-reference-dosimetry-practices
#10
Bryan Muir, Wesley Culberson, Stephen Davis, Gwe-Ya Kim, Yimei Huang, Sung-Woo Lee, Jessica Lowenstein, Arman Sarfehnia, Jeffrey Siebers, Naresh Tolani
PURPOSE: To present the results and discuss potential insights gained through surveys on reference dosimetry practices. METHODS: Two surveys were sent to medical physicists to learn about the current state of reference dosimetry practices at radiation oncology clinics worldwide. A short survey designed to maximize response rate was made publicly available and distributed via the AAPM website and a medical physics list server. Another, much more involved survey, was sent to a smaller group of physicists to gain insight on detailed dosimetry practices...
April 11, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28386427/workshop-on-reconstruction-schemes-for-magnetic-resonance-data-summary-of-findings-and-recommendations
#11
Esin Ozturk-Isik, Ian Marshall, Patryk Filipiak, Arnold J V Benjamin, Valia Guerra Ones, Rafael Ortiz Ramón, Maria Del C Valdés Hernández
The high-fidelity reconstruction of compressed and low-resolution magnetic resonance (MR) data is essential for simultaneously improving patient care, accuracy in diagnosis and quality in clinical research. Sponsored by the Royal Society through the Newton Mobility Grant Scheme, we held a half-day workshop on reconstruction schemes for MR data on 17 August 2016 to discuss new ideas from related research fields that could be useful to overcome the shortcomings of the conventional reconstruction methods that have been evaluated to date...
February 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28383681/effective-doses-radiation-to-the-patients-in-examinations-performed-in-three-ct-scanners-in-brazil%C3%A2
#12
Mônica Silva Costa Janson Ney, Alair Augusto Sarmet Moreira Damas Dos Santos, GIuliana Vasconcelos De Souza Fonseca, Caio Silva Lodi
This work aimed to analyze the effective doses radiation, estimated from the dose-length product, in 4821 examinations carried out in three CT scanners (named as A, B and C) during the period of December 1st 2013 to 30th November 2014 and compare them, with 95% confidence interval, with typical values for the CT practice described in the American Association of Physicists in Medicine (AAPM) Report # 96 (2008). The mean values of effective doses found in the A, B and C equipments were, respectively, 1.55, 2...
April 5, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28376237/use-of-image-registration-and-fusion-algorithms-and-techniques-in-radiotherapy-report-of-the-aapm-radiation-therapy-committee-task-group-no-132
#13
Kristy K Brock, Sasa Mutic, Todd R McNutt, Hua Li, Marc L Kessler
Image registration and fusion algorithms exist in almost every software system that creates or uses images in radiotherapy. Most treatment planning systems support some form of image registration and fusion to allow the use of multimodality and time-series image data and even anatomical atlases to assist in target volume and normal tissue delineation. Treatment delivery systems perform registration and fusion between the planning images and the in-room images acquired during the treatment to assist patient positioning...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28375733/single-molecule-analysis-of-bacterial-dna-repair-and-mutagenesis
#14
Stephan Uphoff, David J Sherratt
Ubiquitous conserved processes that repair DNA damage are essential for the maintenance and propagation of genomes over generations. Then again, inaccuracies in DNA transactions and failures to remove mutagenic lesions cause heritable genome changes. Building on decades of research using genetics and biochemistry, unprecedented quantitative insight into DNA repair mechanisms has come from the new-found ability to measure single proteins in vitro and inside individual living cells. This has brought together biologists, chemists, engineers, physicists, and mathematicians to solve longstanding questions about the way in which repair enzymes search for DNA lesions and form protein complexes that act in DNA repair pathways...
March 24, 2017: Annual Review of Biophysics
https://www.readbyqxmd.com/read/28367132/experts-and-novices-perception-of-ignorance-and-knowledge-in-different-research-disciplines-and-its-relation-to-belief-in-certainty-of-knowledge
#15
Isabelle Hansson, Sandra Buratti, Carl Martin Allwood
Assessments of the extent of knowledge in a domain can be important since non-identified lack of knowledge may lead to decisions that do not consider the effect of relevant factors. Two studies examined experts' and novices' perception of their own ignorance and knowledge out of everything there is to know within their own and other disciplines and their assessments of their discipline's, and other disciplines' knowledge of all there is to know in each discipline. In total 380 experts and 401 students from the disciplines of history, medicine, physics, and psychology participated...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28366572/development-of-a-quality-and-safety-competency-curriculum-for-radiation-oncology-residency-an-international-delphi-study
#16
Jenna Adleman, Caitlin Gillan, Amanda Caissie, Carol-Anne Davis, Brian Liszewski, Andrea McNiven, Meredith Giuliani
PURPOSE: To develop an entry-to-practice quality and safety competency profile for radiation oncology residency. METHODS AND MATERIALS: A comprehensive list of potential quality and safety competency items was generated from public and professional resources and interprofessional focus groups. Redundant or out-of-scope items were eliminated through investigator consensus. Remaining items were subjected to an international 2-round modified Delphi process involving experts in radiation oncology, radiation therapy, and medical physics...
February 14, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28336618/in-search-for-unseen-matter-physicists-turn-to-dark-sector
#17
Adrian Cho
No abstract text is available yet for this article.
March 24, 2017: Science
https://www.readbyqxmd.com/read/28332995/three-dimensional-dosimetric-validation-of-a-magnetic-resonance-guided-intensity-modulated-radiation-therapy-system
#18
Leith J Rankine, Stewart Mein, Bin Cai, Austen Curcuru, Titania Juang, Devin Miles, Sasa Mutic, Yuhe Wang, Mark Oldham, H Harold Li
PURPOSE: To validate the dosimetric accuracy of a commercially available magnetic resonance guided intensity modulated radiation therapy (MRgIMRT) system using a hybrid approach: 3-dimensional (3D) measurements and Monte Carlo calculations. METHODS AND MATERIALS: We used PRESAGE radiochromic plastic dosimeters with remote optical computed tomography readout to perform 3D high-resolution measurements, following a novel remote dosimetry protocol. We followed the intensity modulated radiation therapy commissioning recommendations of American Association of Physicists in Medicine Task Group 119, adapted to incorporate 3D data...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28328309/ibpro-a-novel-short-duration-teaching-course-in-advanced-physics-and-biology-underlying-cancer-radiotherapy
#19
Michael C Joiner, Monica W Tracey, Sara E Kacin, Jay W Burmeister
This article provides a summary and status report of the ongoing advanced education program IBPRO - Integrated course in Biology and Physics of Radiation Oncology. IBPRO is a five-year program funded by NCI. It addresses the recognized deficiency in the number of mentors available who have the required knowledge and skill to provide the teaching and training that is required for future radiation oncologists and researchers in radiation sciences. Each year, IBPRO brings together 50 attendees typically at assistant professor level and upwards, who are already qualified/certified radiation oncologists, medical physicists or biologists...
March 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28320777/converging-on-ras
#20
(no author information available yet)
Biologists at the Frederick National Laboratory for Cancer Research have teamed up with computer scientists and physicists at the Department of Energy to tackle the problem of "undruggable" RAS. The goal is to obtain a precise understanding of how RAS is activated by interactions with the plasma membrane; this will be illuminated through supercomputer simulations that build on structural and biochemical studies of RAS.
March 20, 2017: Cancer Discovery
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