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Method for Increasing the Resolution of Medical Ultrasound B-Mode Images

IP.com Disclosure Number: IPCOM000040550D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Berger, I: AUTHOR [+3]

Abstract

A major limitation in present-day medical ultrasound imaging is low resolution, especially in the direction transversal to the beam. Under the proposed method, an odd number of ultrasonic RF-scans are combined. The first scan, labeled "O", is performed with the transducer being linearly moved over the region to be scanned, whereby transducer axis and direction of movement are mutually perpendicular. The sampled and digitized RF-data obtained from this scan are stored in a memory. A successive scan, labeled k (-n < k < n; n, k are integers; n > 1, k unequal 0), is performed by again moving the transducer over the region of interest along the same straight line, but inclining the axis of the transducer with respect to the direction of movement by an angle of 90o + k x a.

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Method for Increasing the Resolution of Medical Ultrasound B-Mode Images

A major limitation in present-day medical ultrasound imaging is low resolution, especially in the direction transversal to the beam. Under the proposed method, an odd number of ultrasonic RF-scans are combined. The first scan, labeled "O", is performed with the transducer being linearly moved over the region to be scanned, whereby transducer axis and direction of movement are mutually perpendicular. The sampled and digitized RF-data obtained from this scan are stored in a memory. A successive scan, labeled k (-n < k < n; n, k are integers; n > 1, k unequal 0), is performed by again moving the transducer over the region of interest along the same straight line, but inclining the axis of the transducer with respect to the direction of movement by an angle of 90o + k x a. The scanning signal obtained is stored in a separate memory labeled k. Each memory is a two- dimensional array M (i,j), where the i-th row corresponds to one single scan trace, and the j-th column represents samples of all traces of the scan with the same distance from the transducer. Preprocessing in the form, e.g., of deconvolution along each scan trace may be used before the data are rearranged. Depending on the angle, data in memories with k unequal 0 are arranged so as to make any given memory cell in every scan memory represent the same location in the final image. The rearrangement of the memory is performed first by ve...