A Frequency Diversity Method of Reducing Speckle in Wideband Ultrasound Images
A set of concurrent real-time B-mode image lines has been formed using a parallel processing system. In this system, a wideband received echo is partitioned by frequency diversity filtering and separate image lines are formed. Due to their differing constituent frequencies, these lines have decorrelated speckle patterns. The amount of speckle in the displayed image is reduced upon averaging these image lines. The reduction in image speckle and the accompanying improvement in perceived resolution is accomplished with no sacrifice of temporal resolution or display format. The effects of filter separation and amplitude apodization of the received frequency spectrum are investigated through statistical analysis of images containing speckle producing targets. A measurable increase in image signal-to-noise ratio has been achieved.
KeywordsFrequency Diversity Speckle Pattern Image Line Image Speckle Speckle Reduction
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- Korpel, A., Whiteman, R.L., and Ahmed, M., “Elimination of Spurious Detail in Acoustical Images,” Acoustic Holography, Vol. 5, pp. 373–390, 1975.Google Scholar
- Galloway, R.L., A Trimodal Parallel Processing System for Speckle Reduction in B-Mode Ultrasound Images, Thesis Dissertation, Duke University, December, 1983.Google Scholar
- Trahey, G.E., Allison, J.W., Smith, S.W., and von Ramm, O.T., “Simultaneous Frequency and Spatial Compounding for Increased Speckle Reduction,” Ultrasonic Imaging, 8, p. 68. (abstract)Google Scholar
- Entrekin, R. and Melton, H.E., “Real Time Speckle Reduction in B-Mode Images,” IEEE Ultrasonics Symposium Proceedings, pp. 169–174, Sept. 1979.Google Scholar
- Gelbach, S.M., Pulse Reflection Imaging and Acoustic Speckle, Thesis Dissertation, Stanford University, March 1983.Google Scholar
- Gelbach, S.M., and Sommer, F.G., “Frequency Diversity Speckle Processing,” Ultrasonic Imaging, 8, p. 67. (abstract)Google Scholar
- Yoshida, C, Nakajima, M., and Yuta, S., “Real-Time Speckle Reduction in Ultrasound Echo Imaging”, Proceedings of the Fourth Meeting of the World Federation for Ultrasound in Medicine and Biology, Sydney, Australia, July, 1985. (abstract)Google Scholar
- Burckhardt, C.B., “Speckle in Ultrasound B-Mode Scans,” IEEE Trans. on Sonics and Ultrasonics, SU-25, No. 1, pp. 1–6, Jan. 1978.Google Scholar
- Papoulis, A., Probability, Random Variables, and Stochastic Processes, McGraw Hill Book Co., New York, 1965.Google Scholar