Skew-focus phased array imaging: application to multidimensional velocity estimation

Emad S. Ebbini

doi:10.1117/12.382231

12 April 2000 Skew-focus phased array imaging: application to multidimensional velocity estimation

Emad S. Ebbini

Proceedings Volume 3982, Medical Imaging 2000: Ultrasonic Imaging and Signal Processing; (2000) https://doi.org/10.1117/12.382231
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

A novel method for multi-dimensional velocity estimation using phased arrays is introduced. The method is based on the 'skew- focus' beam recently discovered by the author. The skew-focus can be steered and focused like any normal phased array beam, except that the phase fronts within the resolution cell are slanted off the main direction of propagation. Using two complementary skew-focus beams with skew angles on both sides of the main beam direction, one can obtain two independent estimates of the velocity vector. The true velocity vector can be estimated from these measurements in a straightforward manner. Skew-focus beams can be optimally synthesized in the CW case using a technique previously introduced by the author. It was discovered that the CW synthesis leads to a family of apodization functions largely independent of frequency and are directly applicable in the wideband case. These apodization functions can be expressed analytically and evaluated numerically for a given slant angle (in addition to the steering angle and focal depth). It is important to note that the resulting apodization functions are smooth and do not result from an ill-posed synthesis procedure. Therefore, these solutions are robust to quantization and discretization effects.

Citation Download Citation

Emad S. Ebbini "Skew-focus phased array imaging: application to multidimensional velocity estimation", Proc. SPIE 3982, Medical Imaging 2000: Ultrasonic Imaging and Signal Processing, (12 April 2000); https://doi.org/10.1117/12.382231

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available