نتایج جستجو برای: imaging parameters

تعداد نتایج: 1010187  

2017
Bumwoo Park Byung Se Choi Yu Sub Sung Dong-Cheol Woo Woo Hyun Shim Kyung Won Kim Yoon Seok Choi Sang Joon Pae Ji-Yeon Suh Hyungjoon Cho Jeong Kon Kim

OBJECTIVE To simulate the B1-inhomogeneity-induced variation of pharmacokinetic parameters on dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). MATERIALS AND METHODS B1-inhomogeneity-induced flip angle (FA) variation was estimated in a phantom study. Monte Carlo simulation was performed to assess the FA-deviation-induced measurement error of the pre-contrast R1, contrast-enhance...

2014
Alex Shenfield John M. Rodenburg John Dalton

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Journal: :Physics in medicine and biology 2000
W F Walker F J Fernandez L A Negron

Acoustic radiation force has been proposed as a method of interrogating the mechanical properties of tissue. One simple approach applies a series of focused ultrasonic pulses to generate an acoustic radiation force, then processes the echoes returned from these pulses to estimate the radiation-force-induced displacement as a function of time. This process can be repeated at a number of location...

2002
Ertan Zencir Numan S. Dogan Ercument Arvas

Modeling and performance of on-chip spiral inductors is presented. Y-parameters are obtained from the measured S-parameters of the inductor fabricated in 0.35-μm SOI CMOS technology. Matlab is used to get the π-equivalent circuit model parameters at each frequency point. The SOI CMOS inductor shows better performance characteristics in terms of Q-factor and self-resonance frequency.

1997
Gary P. Scavone Julius O. Smith

This paper demonstrates a digital waveguide implementation of a six-hole woodwind tonehole lattice, based on theory and measurements published by Keefe (1981). Woodwind tonehole transmission-matrix parameters are converted to traveling-wave scattering parameters suitable for digital waveguide implementation. Second-order digital filters are designed to approximate the reflection and transmissio...

2013
Issei Fukunaga Masaaki Hori Yoshitaka Masutani Nozomi Hamasaki Shuji Sato Yuriko Suzuki Fumitaka Kumagai Masatsugu Kosuge Haruyoshi Hoshito Koji Kamagata Keigo Shimoji Atsushi Nakanishi Shigeki Aoki Atsushi Senoo

Diffusional kurtosis imaging (DKI) is a new technique based on non-Gaussian water diffusion analysis. However, the original DKI protocol (six b values and 30 motion-probing gradient (MPG) directions) requires more than 10 min of scanning time, which is too long for daily clinical use. We aimed to find suitable b value, MPG direction, and diffusion time settings for faster DKI. Four normal healt...

2012
Amira Zaylaa Sébastien Ménigot Jean-Marc Girault Jamal Charara

Contrast ultrasound imaging has become a significant imaging technique for the last ten years. Physiological and pathological information are accessible thanks to microbubble injection and nonlinearity detection. To improve resolution and penetration, frequency modulated signals called chirps combined with compression filter have been utilized by radar technology. Recent studies applied the use...

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