نتایج جستجو برای: thermometry
تعداد نتایج: 2192 فیلتر نتایج به سال:
We review recent determinations of the Boltzmann constant kB and differences T − T90 that used cylindrical acoustic gas thermometry (c-AGT). These measured resonance frequencies argon enclosed by metal-walled, cavities. (Here, is thermodynamic temperature on International Temperature Scale 1990, ITS-90.) In range 234–303 K, standard uncertainty c-AGT ranges from 1.9 × 10−6T to 2.6 10−6T. This m...
A derivation of the fundamental limits to precision cellular temperature sensing reveals that extrinsic limit, based on thermal fluctuations in environment, is orders magnitude more precise than observed for cells.
Background/introduction Magnetic resonance (MR) imaging plays an important role in monitoring thermal treatment. It can quantify thermal dose with temperature maps based on the proton-resonance frequency shift. Volumetric coverage is desirable, but acquiring multiple slices imaging is time consuming. Therefore, accelerated methods are needed to improve the spatial and temporal resolution in MR ...
BACKGROUND We sought to evaluate agreement between a new and widely implemented method of temperature measurement in critical care, temporal artery thermometry and an established method of core temperature measurement, bladder thermometry as performed in clinical practice. METHODS Temperatures were simultaneously recorded hourly (n = 736 observations) using both devices as part of routine cli...
2816.5. Baron P, Ries M, Deckers R, de Greef M, et al. In vivo T2 -based MR thermometry in adipose tissue layers for high-intensity focused ultrasound near-field monitoring. Magn Reson Med, 2014;72(4), 1057-1064.
A cylindrical phantom, resembling average human neck, was prepared by using hydrogel sheets containing vinyl and polysaccharide. The phantom was used to obtain temperature distributions for 6 values of input power of radio frequency (RF) at 8MHz,by invasive thermometry technique, using thermistor probes. The inclusion of cervical vertebrae and calcium carbonate pieces (human bone representative...
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