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https://www.readbyqxmd.com/read/28811485/direct-detection-electron-energy-loss-spectroscopy-a-method-to-push-the-limits-of-resolution-and-sensitivity
#1
James L Hart, Andrew C Lang, Asher C Leff, Paolo Longo, Colin Trevor, Ray D Twesten, Mitra L Taheri
In many cases, electron counting with direct detection sensors offers improved resolution, lower noise, and higher pixel density compared to conventional, indirect detection sensors for electron microscopy applications. Direct detection technology has previously been utilized, with great success, for imaging and diffraction, but potential advantages for spectroscopy remain unexplored. Here we compare the performance of a direct detection sensor operated in counting mode and an indirect detection sensor (scintillator/fiber-optic/CCD) for electron energy-loss spectroscopy...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801960/mri-characterization-of-brown-adipose-tissue-under-thermal-challenges-in-normal-weight-overweight-and-obese-young-men
#2
Jie Deng, Lisa M Neff, Nicholas C Rubert, Bin Zhang, Richard M Shore, Jonathan D Samet, Paige C Nelson, Lewis Landsberg
PURPOSE: To implement quantitative Dixon magnetic resonance imaging (MRI) methods for brown adipose tissue (BAT) characterization at inactive and cold-activated states in normal weight, overweight, and obese subjects. The hypotheses are that MRI characteristics of BAT would differentiate between nonobese and obese subjects, and activation of BAT in response to thermal challenges that are detected by MRI would be correlated with BAT activity measured by positron emission tomography / computed tomography (PET/CT)...
August 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28795892/cold-atmospheric-pressure-plasma-for-treatment-of-chronic-wounds-drug-or-medical-device
#3
A Kramer, B R Conway, K Meissner, F Scholz, B H Rauch, A Moroder, A Ehlers, A J Meixner, C-D Heidecke, L I Partecke, M Kietzmann, O Assadian
OBJECTIVE: The use of cold atmospheric pressure plasma (CAPP) as a new therapeutic option to aid the healing of chronic wounds appears promising. Currently, uncertainty exists regarding their classification as medical device or medical drug. Because the classification of CAPP has medical, legal, and economic consequences as well as implications for the level of preclinical and clinical testing, the correct classification is not an academic exercise, but an ethical need. METHOD: A multidisciplinary team of physicians, surgeons, pharmacists, physicists and lawyers has analysed the physical and technical characteristics as well as legal conditions of the biological action of CAPP...
August 2, 2017: Journal of Wound Care
https://www.readbyqxmd.com/read/28782064/the-extraordinary-impact-of-michael-faraday-on-chemistry-and-related-subjects
#4
EDITORIAL
Sir John Meurig Thomas
Biographers of Michael Faraday, as well as many dictionaries of science, often describe him as a physicist, which he certainly was. But he was also an astonishingly effective chemist: in fact, he was the Fullerian Professor of Chemistry (at the Royal Institution, RI) from 1834 until the time of his death in August, 1867. To mark the sesquicentenary of his passing, this editorial, by one of his distant successors as Director and Fullerian Professor at the RI, focuses on Faraday's output and influence as a scientist...
August 7, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28771919/comparison-of-aapm-addendum-to-tg-51-iaea-trs-398-and-jsmp-12-calibration-of-photon-beams-in-water
#5
Naoki Kinoshita, Hiroshi Oguchi, Yasuhiro Nishimoto, Toshiki Adachi, Hiroki Shioura, Hirohiko Kimura, Kunio Doi
The American Association of Physicists in Medicine (AAPM) Working Group on TG-51 published an Addendum to the AAPM's TG-51 protocol (Addendum to TG-51) in 2014, and the Japan Society of Medical Physics (JSMP) published a new dosimetry protocol JSMP 12 in 2012. In this study, we compared the absorbed dose to water determined at the reference depth for high-energy photon beams following the recommendations given in AAPM TG-51 and the Addendum to TG-51, IAEA TRS-398, and JSMP 12. This study was performed using measurements with flattened photon beams with nominal energies of 6 and 10 MV...
August 3, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28770878/who-teaches-science-to-nurses
#6
Naghma Rizvi
OBJECTIVE: To explore the demographics of individuals teaching basic science courses in private nursing schools. METHODS: The study was conducted in Karachi, and comprised teachers teaching basic science courses in 16 registered private nursing schools. A demographic questionnaire was used to collect data. The study was conducted in the year 2013. RESULTS: Teachers holding academic/professional degrees in different science disciplines were involved in teaching science to nurses...
July 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28739323/the-medical-physicist-s-role-in-radiation-optimization
#7
Eric L Gingold
No abstract text is available yet for this article.
July 21, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28736725/intraoperative-radiation-therapy-a-promising-treatment-modality-in-head-and-neck-cancer
#8
REVIEW
Lara Hilal, Karine A Al Feghali, Paul Ramia, Ibrahim Abu Gheida, Jean-Pierre Obeid, Wassim Jalbout, Bassem Youssef, Fady Geara, Youssef H Zeidan
Every year, almost 62,000 are diagnosed with a head and neck cancer (HNC) and 13,000 will succumb to their disease. In the primary setting, intraoperative radiation therapy (IORT) can be used as a boost in select patients in order to optimize local control. Addition of external beam radiation to limited volumes results in improved disease control over surgery and IORT alone. In the recurrent setting, IORT can improve outcomes from salvage surgery especially in patients previously treated with external beam radiation...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28735877/dose-comparison-between-tg-43-based-calculations-and-radiochromic-film-measurements-of-the-freiburg-flap-applicator-used-for-high-dose-rate-brachytherapy-treatments-of-skin-lesions
#9
Saad Aldelaijan, Hamed Bekerat, Ivan Buzurovic, Phillip Devlin, Francois DeBlois, Jan Seuntjens, Slobodan Devic
PURPOSE: Current high-dose-rate brachytherapy skin treatments with the Freiburg flap (FF) applicator are planned with treatment planning systems based on the American Association of Physicists in Medicine TG-43 data sets, which assume full backscatter conditions in dose calculations. The aim of this work is to describe an experimental method based on radiochromic film dosimetry to evaluate dose calculation accuracy during surface treatments with the FF applicator at different depths and bolus thicknesses...
July 20, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28731288/radiation-therapists-perspectives-on-participating-in-research
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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