E J Boote | PubMed Health

PubMed1991

Improved resolution backscatter coefficient imaging.

This paper reports the extension of a method for imaging acoustic backscatter coefficients that allows for greater spatial resolution in the resulting images. This is done by using a broad-band excitation pulse and short-duration time gates in the analysis. The images produced had better spatial resolution than the previously reported technique [Ultrasonic Imaging 10, 121-138]. Furthermore, the pixel values were based upon quantitatively accurate backscatter coefficients at given spatial locations. The paper also discusses the additional computational requirements of greater spatial resolution and proposes a least-squares fit to a smoothly varying set of sparse data to generate the data points in between.

Ultrasonics↗

PubMedDate not supplied

Backscatter coefficient imaging using a clinical scanner.

A clinical ultrasound scanner has been integrated with a digital data acquisition system to record echo signals for off-line processing of quantitative acoustic backscatter images. The method used to determine backscatter coefficients accounts for experimental factors related to the beam directivity function, the transmitting and receiving electronics, and the attenuation path of the beam. After characterization and calibration of the ultrasound scanner according to the data processing requirements, the quantitative backscatter coefficient for tissue-mimicking phantoms are within 14% of a value predicted by scattering theory. On five normal volunteers, preliminary in vivo liver images of the acoustic backscatter coefficient are obtained. Results from this study are compared to previously published in vitro results.

Humans↗