نتایج جستجو برای: rf method

تعداد نتایج: 1658041  

Journal: :journal of research in medical sciences 0
neda alijanian afsoon emami naini shahrzad shahidi lida liaghat rahil r. samani

normal 0 false false false en-us x-none ar-sa background: dry weight (dw) is an important concept related to patients undergoing hemodialysis. conventional method seems to be time consuming and operator dependent. bio impedance analysis (bia) is a new and simple method reported to be an accurate way for estimating dw. in this study, we aimed to compare the conventional estimation of dw with mea...

2009
Wenlong Xu Feng Liu Ling Xia Stuart Crozier

A comprehensive consideration of loading effects is essential to the design/analysis of high-frequency MRI radio frequency (RF) coils. In this study, a hybrid finite difference time domain (FDTD)-method of moments (MoM) simulation method is implemented for the accurate evaluation of RF coil-tissue interaction. Using this approach, the RF coil is modelled using the MoM algorithm, and the biologi...

2005
B. Xu B. K. Li S. Crozier F. Liu Q. Wei

B. Xu, B. K. Li, S. Crozier, F. Liu, Q. Wei School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Queensland, Australia INTRODUCTION: High magnetic field (frequency) MRI technology has brought considerable engineering challenges in the form of ancillary hardware, including RF resonators. Studies in high frequency MRI have shown significant interact...

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2008
Mehdi Moradi Parvin Mousavi Robert Siemens Eric Sauerbrei Alexander Boag Purang Abolmaesumi

We describe a very efficient method based on ultrasound RF time series analysis and support vector machine classification for generating probabilistic prostate cancer colormaps to augment the biopsy process. To form the RF time series, we continuously record ultrasound RF echoes backscattered from tissue while the imaging probe and the tissue are stationary in position. In an in-vitro study inv...

ژورنال: آبخیزداری ایران 2020

Flood zonation mapping is one of the priorities for the soil and water management, which Remote Sensing (RS) capabilities are very applicable to this issue. The main objective of this research was study of accuracy of the Object oriented and Pixel based methods for flood zonation mapping in the Taleghan River basin. Therefore, the Sentinel 2A satellite image of the study area classified using s...

Journal: :journal of medical signals and sensors 0
fereshteh yousefi rizi seyed kamaledin setarehdan hamid behnam

quantification of arterial elasticity and its dependency to age is considered in this paper. we use radiofrequency (rf) signals fromcarotid artery ultasonography to evaluate this dependency. blood pressure, blood flow, and tethering to surrounding tissue are the maincauses of the motion of the carotid wall. tracking carotid artery wall motion from a series of ultrasound b‑mode images is challen...

2017
M Wilde-Piórko M Grycuk M Polkowski M Grad

The receiver function (RF) technique is a well-established method to investigate the crustal and upper mantle structures based on three-component seismograms of teleseismic events. In the present study, we propose a modified automatic procedure to determine the back azimuth and polarization angles of a teleseismic event based on the RF technique. The method is tested for the recording of 3 perm...

Journal: :journal of ornamental plants 2015
m. nasr esfahani a.r. ahmadi k. shirazi

root-knot nematodes, meloidogyne spp., are one of the important plant parasitic nematodes of tomato in the world. the most suitable control method of plant parasitic nematodes is the use of resistance sources and tolerant cultivars. in the earlier studies, the results showed thatonly 2% (19 out of 537 varieties) were resistant and tolerant to the root knot nematodes. in the supplementary studie...

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