Resolution Enhancement In Ultrasonic Imaging By A Time-Varying Filter

N. H. Ching; D. Rosenfeld; M. Braun

doi:10.1117/12.940251

10 September 1987 Resolution Enhancement In Ultrasonic Imaging By A Time-Varying Filter

N. H. Ching, D. Rosenfeld, M. Braun

Proceedings Volume 0768, Pattern Recognition and Acoustical Imaging; (1987) https://doi.org/10.1117/12.940251
Event: International Symposium on Pattern Recognition and Acoustical Imaging, 1987, Newport Beach, CA, United States

Abstract

The study reported here investigates the use of a time-varying filter to compensate for the spreading of ultrasonic pulses due to the frequency dependence of attenuation by tissues. The effect of this pulse spreading is to degrade progressively the axial resolution with increasing depth. The form of compensation required to correct for this effect is impossible to realize exactly. A novel time-varying filter utilizing a bank of bandpass filters is proposed as a realizable approximation of the required compensation. The performance of this filter is evaluated by means of a computer simulation. The limits of its application are discussed. Apart from improving the axial resolution, and hence the accuracy of axial measurements, the compensating filter could be used in implementing tissue characterization algorithms based on attenuation data.

Citation Download Citation

N. H. Ching, D. Rosenfeld, and M. Braun "Resolution Enhancement In Ultrasonic Imaging By A Time-Varying Filter", Proc. SPIE 0768, Pattern Recognition and Acoustical Imaging, (10 September 1987); https://doi.org/10.1117/12.940251

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