Abstract
An amplitude quantizing method for analog-to-digital (A/D) conversion of an ultrasonic echo from biological tissue is discussed. The unequal interval quantization (UIQ) method, which precisely quantizes a small amplitude signal and roughly quantizes a large-amplitude signal, is proposed. The B-mode images of sponge and of liver are constructed using 10-b equal interval quantization (EIQ, the quantizing method used in general A/D converters), 6-b UIQ, and 6-b EIQ. There is practically no difference between the images made by 10-b EIQ and 6-b UIQ, whereas weak signals are not displayed in the image made by 6-b EIQ. Using UIQ A/D conversion, one can construct an image as good as that made by a high-resolution A/D converter using the EIQ with a smaller number of output bits.
Original language | English |
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Pages (from-to) | 1491-1494 |
Number of pages | 4 |
Journal | Ultrasonics Symposium Proceedings |
Volume | 3 |
Publication status | Published - 1990 Dec 1 |
Event | Proceedings of the IEEE 1990 Ultrasonics Symposium - Honolulu, HI, USA Duration: 1990 Dec 4 → 1990 Dec 7 |
ASJC Scopus subject areas
- Engineering(all)