1,116 resources related to Dosimetry
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The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
This conference provides an exchange of technical topics in the fields of Solid State Modulators and Switches, Breakdown and Insulation, Compact Pulsed Power Systems, High Voltage Design, High Power Microwaves, Biological Applications, Analytical Methods and Modeling, and Accelerators.
Bi-Annual IEEE PES T&D conference. Largest T&D conference in North America.
All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation
The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
EMC standards; measurement technology; undesired sources; cable/grounding; filters/shielding; equipment EMC; systems EMC; antennas and propagation; spectrum utilization; electromagnetic pulses; lightning; radiation hazards; and Walsh functions
Publishes original and significant contributions relating to the theory, design, performance and reliability of electron devices, including optoelectronic devices, nanoscale devices, solid-state devices, integrated electronic devices, energy sources, power devices, displays, sensors, electro-mechanical devices, quantum devices and electron tubes.
IEE Colloquium on Optical Techniques and Biomedical Applications, 1991
IEE Colloquium on Modern Methods of Detecting and Measuring Ionising Radiations, 1992
Radio Science, 1979
From lessons learned in the late 1960s and early 1970s, skilled teams of interdisciplinary investigators have formed that are making technical and scientific contributions to knowledge of the biological response to non- ionizing electromagnetic radiations. Examples of technological advances in the US and other Western nations are nonperturbing thermal sensors, and dosimeters for measuring whole-body absorption of energy and for ...
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2006
The primary goal in this study was to investigate 3-D dose distribution, near the areas of tissue inhomogeneities, in Gamma Knife radiosurgery with the gel dosimetry. The spherical glass balloon of a diameter of 16 cm filled with the gel forms the homogeneous phantom; and an identical balloon with two corks placed on each side to represent the air cavities ...
2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
Wireless power transfer (W PT) technology has attracted great attention for its high transfer efficiency with a long transfer range. Concerning biological hazards caused by strong electromagnetic fields in proximity to the WPT system, the dosimetry of the WPT system needs to be investigated in detail. In this paper, exposure assessment of the WPT system with a homogeneous cylinder in ...
From lessons learned in the late 1960s and early 1970s, skilled teams of interdisciplinary investigators have formed that are making technical and scientific contributions to knowledge of the biological response to non- ionizing electromagnetic radiations. Examples of technological advances in the US and other Western nations are nonperturbing thermal sensors, and dosimeters for measuring whole-body absorption of energy and for determining differential uptake of energy in tissues of interest. These advances have enabled considerable gains in knowledge and prediction of energy capture by human and infrahuman bodies as functions of wavelength and orientation of an object in the field. Complementing these advances are those by Eastern investigators, who have performed many epidemiological surveys and have pioneered studies of behavioral and nervous reactions to long-term, low-level irradiation. The resulting accretion of data, including those from international programs of scientific exchange, will help provide a sound basis for standards of safety and for beneficial applications of radio frequency energy. Especially promising in the area of medicine are microwave techniques for non-invasive diagnostic “imaging” of deep tissues, and for treatment of cancer.
The primary goal in this study was to investigate 3-D dose distribution, near the areas of tissue inhomogeneities, in Gamma Knife radiosurgery with the gel dosimetry. The spherical glass balloon of a diameter of 16 cm filled with the gel forms the homogeneous phantom; and an identical balloon with two corks placed on each side to represent the air cavities forms the inhomogeneous phantom. Dose calibration is performed by irradiating vials at known doses and then utilizing the R2-dose calibration curve. Stereotactic frames and fudicial markers were attached to the phantoms for MR scanning and image processing. Dose distributions from a single shot, using all 201 Cobalt sources, delivered to a known point with identical coordinates, are calculated both in homogeneous and inhomogeneous gel phantoms. In the aspect of dosimetrical quality control, the Gamma Knife planning system predicted dose distribution is compared with the experimental results. In the homogeneous phantom, the gel dosimetry calculated dose distribution is in good agreement with the GammaPlan predicted dose distribution. However, with the inhomogeneous phantom, the dose distribution is spatially different and significant differences in dose levels are observed
Wireless power transfer (W PT) technology has attracted great attention for its high transfer efficiency with a long transfer range. Concerning biological hazards caused by strong electromagnetic fields in proximity to the WPT system, the dosimetry of the WPT system needs to be investigated in detail. In this paper, exposure assessment of the WPT system with a homogeneous cylinder in various operating situations possible was performed to characterize the dosimetry. It was found that the maximum allowable input power of the WPT system is restricted based on the whole-body average specific absorption rate (SAR) rather than the peak 10g-average SAR for some exposure conditions. Finally, a hybrid MoM/FDTD method is us ed to calculate the induced electric field inside the realistic human body and maximum allowable power into the WPT system.
Abnormalities in the structure of chromosomes cause fetal deaths or developmental disorders. Chromosome analysis is a method used to diagnose many chromosomal disorders such as Down syndrome. Metaphase images are needed for chromosome analysis. Objective selections must be made during the acquisition of these images. Selecting of non-analyzable images could directly affect the results of chromosome analysis. In this study, a filter was developed that automatically detects analyzable metaphase images. The developed filter was used with the motorized microscope table and the analyzable metaphase images were detected. After expert evaluation on the results obtained, the average success rate of the filter was calculated as 98.9%. The filter performed an average run time of 76 milliseconds per square.
A numerical method was adopted to solve the diffusion equation to determine ferric ion diffusion coefficient in Fricke-agarose gels. A fast MR acquisition technique was employed to avoid smearing of acquired data due to diffusion over an extended time period. Our results show that for a Fricke gel contained 1 mM ammonium ferrous sulfate, 1% agarose, 1 nM sodium chloride and 50 mM sulfuric acid, its ferric ion diffusion coefficient is 1.73times10<sup>-2</sup> cm<sup>2</sup>h<sup>-1</sup> in room temperature. This value is consistent with the 1 ~ 2times10<sup>-2</sup> cm<sup>2</sup>h<sup>-1 </sup> range obtained by previous studies under varying concentrations of gel ingredients
Presented is the first accumulating capacitive radiation sensor for low-dose, long-term exposures observed in occupational dosimetry. The sensor's capacitance-voltage curve undergoes a semi-permanent negative shift due to ionizing radiation. By measuring the change in capacitance at a given voltage in the depletion region, the ionizing radiation that has been present on the sensor can be extracted. In order to achieve the low dose resolution required (less than 100 μGy) for occupational dosimetry, parameters such as the oxide thickness and annealing conditions are optimized. The result for a 2 mm × 2 mm sensor is 1.6 fF per 100 μGy, a capacitance shift detectable with commercial electronics.
Physical and metering characteristics of three room temperature X-ray dosimeters used in clinical applications, PTW diamond, Thompson MOSFET and Scanditronix silicon diode are compared with polycrystalline diamond X-ray detectors. Development of dosimeters based on natural diamond carried out by PTW have provided superior characteristics with respect to other solid state silicon devices such diodes or MOSFETs. Radiation hardness, soft tissue equivalence, lack of toxicity, negligible energy dependence and optimal sensitivity and reproducibility, have made PTW the ideal metering device for clinical dosimetry. However general use of natural dosimeters have been hindered by their rarity, very high cost and unpredictable electronic behavior due to lack of control on impurity content and crystal defects. Therefore, there have been a growing use of silicon dosimeters especially for on line configuration and in vivo dosimetry. However, both MOSFET and silicon diode do not appear to be ideal for such application for their short lifetime. Detectors based on polycrystalline diamonds seem to be the best candidate for future dosimetry since they have most of the characteristics of natural diamonds at potentially much lower cost. In this context, the performances of a laboratory made polycrystalline diamond device are compared to those of the three, PTW, Scanditronix and Thomson commercial dosimeters
The radiochromic dye films developed by Chalkley and McLaughlin are quickly becoming one of the principal methods for secondary dosimetry. Their useful dose and dose rate ranges, long-term color stability, small and flexible size, and ease of reading make them ideal for spatial dose distribution measurements in the complex targets often encountered in industry. At room temperature, however, their response is slow, requiring several hours after irradiation for full color development. This work examines the effect of humidity on the film's time response and describes a method for accelerating the film's color development. By keeping the film in a controlled humidity environment or through a simple heating technique, the film can be read in minutes instead of hours after irradiation. The results are shown to be identical to those of films stored for 24 hours at room temperature.
To specify protocols for the measurement of the peak spatial-average specific absorption rate (SAR) in a simplified model of the head of users of hand-held radio transceivers used for personal wireless communications services and intended to be operated while held next to the ear. It applies to contemporary and future devices with the same or similar operational characteristics as contemporary ...
IEEE Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement Techniques - Amendment 1: CAD File for Human Head Model (SAM Phantom)
The scope of IEEE Std 1528 is to specify protocols for the measurement of the peak spatial-average SAR in a simplified model of the head of users of handheld radio transceivers used for personal wireless communications services and intended to be operated while held next to the ear. This amendment addresses ambiguity in the language of certain sections and provides ...