1982
DOI: 10.1177/016173468200400101
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An Annular Array System for High Resolution Breast Echography

Abstract: Ultrasound B-mode imaging with electronically focused annular arrays has been associated in the past with fairly complex and expensive electronic circuits. When image quality rather than scanning speed is the prime concern, the concept of switched zone focusing offers an attractive alternative to true dynamic focusing previously reported. Strongly focused apertures used in both transmit and receive modes allow improved lateral resolution, lower side lobe levels, higher sensitivity, as well as simplified electr… Show more

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Cited by 46 publications
(12 citation statements)
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“…To focus the array at a depth d on transmit (or receive), the time delay t n required for ring n of the array is approximately t n = [ a n 2 (1/ R − 1/ d )]/2 c , where R is the geometric focus, c is the speed of sound, and a n is the average radius of ring n [19]. The total round-trip delays t tot = t T + t R , with t T on transmit and t R on receive, were calculated for 25 transmit-receive pairs and applied to the acquired A-lines.…”
Section: Methodsmentioning
confidence: 99%
“…To focus the array at a depth d on transmit (or receive), the time delay t n required for ring n of the array is approximately t n = [ a n 2 (1/ R − 1/ d )]/2 c , where R is the geometric focus, c is the speed of sound, and a n is the average radius of ring n [19]. The total round-trip delays t tot = t T + t R , with t T on transmit and t R on receive, were calculated for 25 transmit-receive pairs and applied to the acquired A-lines.…”
Section: Methodsmentioning
confidence: 99%
“…To focus the array to a depth d on transmit, the time delay t n required for ring n of the array is tn=[an2(1R1d)]2c where R is the geometric focus and a n is the average radius of ring n (Arditi et al, 1982). The total round-trip delay, t tot , is then the sum of the transmit, t T , and receive, t R , delays; t tot = t T + t R .…”
Section: Methodsmentioning
confidence: 99%
“…This approach required five transmit events at each spatial location in order to acquire all 25 transmit-to-receive M-mode data sets. Synthetic focusing consisted of applying appropriate digital delays to each transmit-to-receive pair in order to focus to an axial-depth d [23] and then summing the 25 pairs of data to form a single RF line. The process was repeated at a series of axial focal zones and the focused data from each focal zone were merged into a final composite image.…”
Section: Methodsmentioning
confidence: 99%