Scatterer Number Density Considerations in Reference Phantom-Based Attenuation Estimation
نویسندگان
چکیده
منابع مشابه
Statistics of ultrasonic scatterer size estimation with a reference phantom.
A theoretical expression for the variance of scatterer size estimates is derived for a modified least squares size estimator used in conjunction with a reference phantom method for backscatter coefficient measurement. A Gaussian spatial autocorrelation function is assumed. Simulations and phantom experiments were performed to verify the results for backscatter and size variances. The dependence...
متن کاملEstimation of Effective Scatterer Size and Number Density in Near-Infrared Tomography
Light scattering from tissue originates from the fluctuations in intra-cellular and extra-cellular components, so it is possible that macroscopic scattering spectroscopy could be used to quantify sub-microscopic structures. Both electron microscopy (EM) and optical phase contrast microscopy were used to study the origin of scattering from tissue. EM studies indicate that lipid-bound particle si...
متن کاملEvaluation of the impact of backscatter intensity variations on ultrasound attenuation estimation.
PURPOSE Quantitative ultrasound based approaches such as attenuation slope estimation can be used to determine underlying tissue properties and eventually used as a supplemental diagnostic technique to B-mode imaging. The authors investigate the impact of backscatter intensity and frequency dependence variations on the attenuation slope estimation accuracy. METHODS The authors compare three f...
متن کاملScatterer size estimation in pulse-echo ultrasound using focused sources: calibration measurements and phantom experiments.
In a companion paper [T. A. Bigelow and W. D. O'Brien Jr., J. Acoust. Soc. Am. 116, 578 (2004)], theory, supported by simulations, showed that accurate scatterer size estimates could be obtained using highly focused sources provided that the derived generalized attenuation-compensation function was used and the velocity potential field near the focus could be approximated as a three-dimensional...
متن کاملA low-cost density reference phantom for computed tomography.
The authors characterized a commercially available foam composed of polyurethane and polyisocyanurate which is marketed for modeling parts in the aircraft, automotive, and related industries. The authors found that the foam may be suitable for use as a density reference standard in the range below -400 Hounsfield units. This range is coincident with the density of lung tissue. The foam may be h...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Ultrasound in Medicine & Biology
سال: 2014
ISSN: 0301-5629
DOI: 10.1016/j.ultrasmedbio.2014.01.022