نتایج جستجو برای: gels radiometry dose
تعداد نتایج: 334116 فیلتر نتایج به سال:
Digital airborne imaging is established in practice. Still there are continuous changes in the layout of the digital sensors itself, but also in the processing chains and calibration processes. This current status will shortly be highlighted within this paper. No empirical results are given but a more general overview with focus on the differences between geometric and radiometric aspects of di...
background: radiation-sensitive polymer gels are among the most promising three-dimensional dose verification tools and tissue-like developed to date. among the special features of this type of dosimeters, is be doped with other elements or chemicals which made them appropriate for investigating of dose enhancement with contrast agents, by high atomic number. material and methods: in this study...
Here, we couple two-dimensional, 4-color multi-wavelength imaging radiometry with laser flash heating to determine temperature profiles and melting temperatures under high pressures in a diamond-anvil cell. This technique combines the attributes of flash heating (e.g., minimal chemical reactions, thermal runaway, and sample instability), with those of multi-wavelength imaging radiometry (e.g., ...
It should be noted that thermal changes precede to the anatomical changes that can be detected by traditional methods such as ultrasonography, mammography and palpation. Thus microwave radiometry is a very promising method for the breast cancer detection at an earlier stage. Also it should be noted that as microwave radiometry measures natural electromagnetic radiation from the patient’s tissue...
Following an absolute NIST measurement of the freezing temperature of gold and the adoption of the International Temperature Scale of 1990 (ITS-90), NIST has adopted new measurement scales for the calibration services based on thermal radiometry. In this paper, the new scales are defined and compared to the ITS-90, and the effects of the scale changes on NIST measurement services in optical pyr...
Background & Aim: Nowadays, radiosensitive polymer gels are used as a reliable dosimetry tool for verification of 3D dose distributions. Polymer gel dosimeters consist of an aqueous mixture of monomers and a gelling agent, which after irradiation, 3D dose distribution is acquired by using imaging techniques. The aim of this study is to evaluate the application and capability of normoxic polym...
BACKGROUND Polymer gel dosimeters combined with magnetic resonance imaging (MRI) can be used for dose verification of advanced radiation therapy techniques. However, the uncertainty of dose map measured by gel dosimeter should be known. The purpose of this study is to investigate the uncertainty related to calibration curve and MRI protocol for MAGIC (Methacrylic and Ascorbic acid in Gelatin In...
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