Abstract
A synthetic receive aperture technique is explored for cost-effective ultrasound scanners with high frame rates and beam density. The technique provides ultrasound volumetric imaging where beam count is very large with 2-D transducer arrays using subaperture processing. For every beam line, transmit beam is performed with a small subaperture whereas the reflected echo signals are received from non-overlapping subapertures. For every transmit-receive subaperture combination, a small number of beams are acquired and then the number of beam lines is increased through beam space interpolation. A 2-D linear filter with a different spatial frequency band for each subaperture is employed as the interpolation filter. Performance of the technique is analyzed through simulations. The technique reduces the number of firings and therefore allows real-time imaging with very low susceptibility to motion artifacts.
Highlights
Ultrasonic imaging has been an important diagnostic tool in medical applications where 25 MHz, 64-128 element phased array systems are used in general
The number of beam lines is determined to satisfy the Nyquist criterion for that subaperture, and the number of beams are increased to the required beam number of the full synthesized aperture through digital interpolation
To scan the image space, an active subaperture is fired for every beam line and the echo signals are received from elements of an active receive subaperture in parallel
Summary
Ultrasonic imaging has been an important diagnostic tool in medical applications where 25 MHz, 64-128 element phased array systems are used in general. According to the Nyquist sampling criterion, the total number of beams to scan a 90° sector is .J2 N, where N is the number of array elements with )J2 element spacing. This technique uses different subapertures each consisting of small number of parallel transmit-receive channels.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
