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https://www.readbyqxmd.com/read/28102239/subcycle-quantum-electrodynamics
#1
C Riek, P Sulzer, M Seeger, A S Moskalenko, G Burkard, D V Seletskiy, A Leitenstorfer
Squeezed states of electromagnetic radiation have quantum fluctuations below those of the vacuum field. They offer a unique resource for quantum information systems and precision metrology, including gravitational wave detectors, which require unprecedented sensitivity. Since the first experiments on this non-classical form of light, quantum analysis has been based on homodyning techniques and photon correlation measurements. These methods currently function in the visible to near-infrared and microwave spectral ranges...
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28092407/study-of-potential-health-effects-of-electromagnetic-fields-of-telephony-and-wi-fi-using-chicken-embryo-development-as-animal-model
#2
Henri Woelders, Agnes de Wit, Alexander Lourens, Norbert Stockhofe, Bas Engel, Ina Hulsegge, Dirkjan Schokker, Paula van Heijningen, Stefan Vossen, Dave Bekers, Peter Zwamborn
The objective of this study is to investigate possible biological effects of radiofrequency electromagnetic fields (RF-EMF) as used in modern wireless telecommunication in a well-controlled experimental environment using chicken embryo development as animal model. Chicken eggs were incubated under continuous experimental exposure to GSM (1.8 GHz), DECT (1.88 GHz), UMTS (2.1 GHz), and WLAN (5.6 GHz) radiation, with the appropriate modulation protocol, using a homogeneous field distribution at a field strength of approximately 3 V/m, representing the maximum field level in a normal living environment...
January 16, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28088942/a-distal-lock-electromagnetic-targeting-device-for-intramedullary-nailing-suggestions-and-clinical-experience
#3
Guido Antonini, Wilfried Stuflesser, Cornelio Crippa, Georgios Touloupakis
PURPOSE: To describe our clinical experience with a system named SureShot? Distal Targeting (Smith & Nephew, Memphis, USA) based on magnetic field presence and discuss our suggestions on this technique. METHODS: We analysed prospectively 47 patients affected by humeral, tibial or femoral fractures, treated in our institution during a 3-year period of time (August 2010 to September 2013). We considered the following parameters: the time to set up, the time to position a single screw, the effectiveness of the system (drilling ad screwing), the irradiation exposure time during distal locking procedure and surgical complications...
December 1, 2016: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28075341/a-non-invasive-multichannel-hybrid-fiber-optic-sensor-system-for-vital-sign-monitoring
#4
Marcel Fajkus, Jan Nedoma, Radek Martinek, Vladimir Vasinek, Homer Nazeran, Petr Siska
In this article, we briefly describe the design, construction, and functional verification of a hybrid multichannel fiber-optic sensor system for basic vital sign monitoring. This sensor uses a novel non-invasive measurement probe based on the fiber Bragg grating (FBG). The probe is composed of two FBGs encapsulated inside a polydimethylsiloxane polymer (PDMS). The PDMS is non-reactive to human skin and resistant to electromagnetic waves, UV absorption, and radiation. We emphasize the construction of the probe to be specifically used for basic vital sign monitoring such as body temperature, respiratory rate and heart rate...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28071764/aligned-copper-nanorod-arrays-for-highly-efficient-generation-of-intense-ultra-broadband-thz-pulses
#5
S Mondal, Q Wei, W J Ding, H A Hafez, M A Fareed, A Laramée, X Ropagnol, G Zhang, S Sun, Z M Sheng, J Zhang, T Ozaki
We demonstrate an intense broadband terahertz (THz) source based on the interaction of relativistic-intensity femtosecond lasers with aligned copper nanorod array targets. For copper nanorod targets with a length of 5 μm, a maximum 13.8 times enhancement in the THz pulse energy (in ≤20 THz spectral range) is measured as compared to that with a thick plane copper target under the same laser conditions. A further increase in the nanorod length leads to a decrease in the THz pulse energy at medium frequencies (≤20 THz) and increase of the electromagnetic pulse energy in the high-frequency range (from 20-200 THz)...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28071681/increased-impedance-near-cut-off-in-plasma-like-media-leading-to-emission-of-high-power-narrow-bandwidth-radiation
#6
M S Hur, B Ersfeld, A Noble, H Suk, D A Jaroszynski
Ultra-intense, narrow-bandwidth, electromagnetic pulses have become important tools for exploring the characteristics of matter. Modern tuneable high-power light sources, such as free-electron lasers and vacuum tubes, rely on bunching of relativistic or near-relativistic electrons in vacuum. Here we present a fundamentally different method for producing narrow-bandwidth radiation from a broad spectral bandwidth current source, which takes advantage of the inflated radiation impedance close to cut-off in a medium with a plasma-like permittivity...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063449/vacuum-ultraviolet-frequency-modulation-spectroscopy
#7
U Hollenstein, H Schmutz, J A Agner, M Sommavilla, F Merkt
Frequency-modulation (FM) spectroscopy has been extended to the vacuum-ultraviolet (VUV) range of the electromagnetic spectrum. Coherent VUV laser radiation is produced by resonance-enhanced sum-frequency mixing (νVUV=2νUV+ν2) in Kr and Xe using two near-Fourier-transform-limited laser pulses of frequencies νUV and ν2. Sidebands generated in the output of the second laser (ν2) using an electro-optical modulator operating at the frequency νmod are directly transferred to the VUV and used to record FM spectra...
January 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28060844/where-s-your-phone-a-survey-of-where-women-aged-15-40-carry-their-smartphone-and-related-risk-perception-a-survey-and-pilot-study
#8
Mary Redmayne
Smartphones are now owned by most young adults in many countries. Installed applications regularly update while the phone is in standby. If it is kept near the body, this can lead to considerably higher exposure to radiofrequency electromagnetic radiation than occurred without internet access. Very little is known about current smartphone carrying habits of young women. This survey used an online questionnaire to ask about smartphone location under several circumstances to inform the power calculation for a women's health study...
2017: PloS One
https://www.readbyqxmd.com/read/28059316/all-optical-tuning-of-eit-like-dielectric-metasurfaces-by-means-of-chalcogenide-phase-change-materials
#9
E Petronijevic, C Sibilia
Electromagnetically induced transparency (EIT) is a pump-induced narrowband transparency window within an absorption line of the probe beam spectrum in an atomic system. In this paper we propose a way to bring together the all-dielectric metamaterials to have EIT-like effects and to optically tune the response by hybridizing them with a layer of a phase change material. We propose a design of the metamaterial based on Si nanoresonators that can support an EIT-like resonant response. On the top of the resonators we consider a thin layer of a chalcogenide phase change material, which we will use to tune the optical response...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28051061/electromagnetic-polarization-controlled-perfect-switching-effect-with-high-refractive-index-dimers-and-the-beam-splitter-configuration
#10
Ángela I Barreda, Hassan Saleh, Amelie Litman, Francisco González, Jean-Michel Geffrin, Fernando Moreno
Sub-wavelength particles made from high-index dielectrics, either individual or as ensembles, are ideal candidates for multifunctional elements in optical devices. Their directionality effects are traditionally analysed through forward and backward measurements, even if these directions are not convenient for in-plane scattering practical purposes. Here we present unambiguous experimental evidence in the microwave range that for a dimer of HRI spherical particles, a perfect switching effect is observed out of those directions as a consequence of the mutual particle electric/magnetic interaction...
January 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28049386/quality-assurance-guidelines-for-superficial-hyperthermia-clinical-trials-i-clinical-requirements
#11
Hana Dobsicek Trefna, Hans Crezee, Manfred Schmidt Diplom-Physiker, Dietmar Marder, Ulf Lamprecht, Michael Ehmann, Josefin Hartmann, Jacek Nadobny, Johanna Gellermann, Netteke van Holthe, Pirus Ghadjar, Nicoletta Lomax, Sultan Abdel-Rahman, Christoph Bert, Akke Bakker, Mark Hurwitz, Chris J Diederich, Paul R Stauffer, Gerard C van Rhoon
Quality assurance guidelines are essential to provide uniform execution of clinical trials and treatment in the application of hyperthermia. This document provides definitions for a good hyperthermia treatment and identifies the clinical conditions where a certain hyperthermia system can or cannot adequately heat the tumor volume. It also provides brief description of the characteristics and performance of the current electromagnetic (radiative and capacitive), ultrasound and infrared heating techniques. This information helps to select the appropriate heating technique for the specific tumor location and size, and appropriate settings of the water bolus and thermometry...
January 3, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28048932/th-b-204-03-tg-199-implanted-markers-for-radiation-treatment-verification
#12
Z Wang
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048770/su-g-jep1-05-clinical-impact-of-mlc-tracking-for-lung-sabr
#13
V Caillet, E Colvill, K Szymura, M Stevens, J Booth, P Keall
PURPOSE: The objective of this study was to investigate the dosimetric benefits of multi-leaf collimator (MLC) tracking for lung SABR treatments in end-to-end clinically realistic planning and delivery scenarios. METHODS: The clinical benefits of MLC tracking were assessed using previously delivered treatment plans and physical experiments. The 10 most recent single lesion lung SABR patients were re-planned following a 4D-GTV-based real-time adaptive protocol (PTV defined as the end-of-exhalation GTV plus 5...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048649/tu-h-bra-07-design-construction-and-installation-of-an-experimental-beam-line-for-the-development-of-mri-linac-compatible-electron-accelerator
#14
B Whelan, P Keall, L Holloway, S Gierman, J Schmerge, S Tantawi, A Tremaine, A Trautwein, B Scott, R Fahrig
PURPOSE: MRI guided radiation therapy (MRIgRT) is a rapidly growing field; however, Linac operation in MRI fringe fields represents an ongoing challenge. We have previously shown in-silico that Linacs could be redesigned to function in the in-line orientation with no magnetic shielding by adopting an RF-gun configuration. Other authors have also published insilico studies of Linac operation in magnetic fields; however to date no experimental validation data is published. This work details the design, construction, and installation of an experimental beam line to validate our in-silico results...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048637/su-f-t-324-experimental-measurement-of-optically-stimulated-luminescence-detectors-in-a-mr-igrt-environment-toward-assessing-magnetic-field-effects-on-these-devices-and-their-use-as-an-in-vivo-dosimeter
#15
M Reilly, A Curcuru, S Yaddanapudi, O Green
PURPOSE: To characterize magnetic field effects on Optically Stimulated Luminescence Detectors (OSLDs) for use as an in-vivo dosimeter in an MRIGRT machine. METHODS: Landauer OSLD nano-dots and the MicroStar II reader were used to measure and record OSLDs exposed in and on a solid water phantom in a 10.5 × 10.5 cm(2) field, Co-60, 0.32-Tesla MR-IGRT machine - with and without the presence of the magnetic field. Two orthogonal gantry angles were considered to assess orientation effects on the OSLDs with respect to the incident angle of the radiation beam and magnetic field...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048478/th-b-204-01-real-time-tracking-with-implanted-markers
#16
Q Xu
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048217/su-f-j-146-experimental-validation-of-6-mv-photon-pdd-in-parallel-magnetic-field-calculated-by-egsnrc
#17
A Ghila, S Steciw, B Fallone, S Rathee
PURPOSE: Integrated linac-MR systems are uniquely suited for real time tumor tracking during radiation treatment. Understanding the magnetic field dose effects and incorporating them in treatment planning is paramount for linac-MR clinical implementation. We experimentally validated the EGSnrc dose calculations in the presence of a magnetic field parallel to the radiation beam travel. METHODS: Two cylindrical bore electromagnets produced a 0.21 T magnetic field parallel to the central axis of a 6 MV photon beam...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048109/su-g-jep1-06-correlation-of-lung-tumor-motion-with-tumor-location-using-electromagnetic-tracking
#18
D Muccigrosso, N Maughan, H Schultejans, R Bera, P Parikh
PURPOSE: It is well known that lung tumors move with respiration. However, most measurements of lung tumor motion have studied long treatment times with intermittent imaging; those populations may not necessarily represent conventional LINAC patients. We summarized the correlation between tumor motion and location in a multi-institutional trial with electromagnetic tracking, and identified the patient cohort that would most benefit from respiratory gating. METHODS: Continuous electromagnetic transponder data (Varian Medical, Seattle, WA) of lung tumor motion was collected from 14 patients (214 total fractions) across 3 institutions during external beam radiation therapy in a prospective clinical trial (NCT01396551)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047824/th-b-204-02-application-of-implanted-markers-in-proton-therapy
#19
S Park
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047458/mo-ab-bra-08-a-modular-multi-source-x-ray-tube-for-novel-computed-tomography-applications
#20
B Walker, J Radtke, G Petry, R Swader, G Chen, K Eliceiri, T Mackie
PURPOSE: To develop and build a practical implementation of an x-ray line source for the rapidly increasing number of multi-source imaging applications in CT. METHODS: An innovative x-ray tube was designed using CST Particle Studio, ANSYS, and SolidWorks. A slowly varying magnetic field is synchronized with microsecond gating of multiple thermionic electron sources. Electrostatic simulations were run to optimize the geometry of the optics and prevent electrode arcing...
June 2016: Medical Physics
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