Method and apparatus for preventing axial spatial aliasing in ul

Details Method and apparatus for preventing axial spatial aliasing in ul Method and apparatus for preventing axial spatial aliasing in ul

1996-12-30

1998-10-27

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

A61B 806

Patent

active

058271899

ABSTRACT:
A method using a progressive sampling rate technique to maintain the sampling rate at the Nyquist frequency of the I/Q data through a tunable equalization bandpass filter in the front end of the imager and then increasing the sampling rate via axial interpolation to prevent aliasing during the nonlinear detection process. If an envelope detector is used, the bandwidth of the detector output should be approximately double that of the I/Q data. In this case, the sampling rate is doubled (or more) by axial interpolation before envelope detection. A 2-point linear interpolator can be used. Depending on the application, this axial interpolator can be turned on or off automatically by the system. After detection, the signal can be low-pass filtered to restrict the speckle bandwidth prior to log compression.

REFERENCES:
patent: 5398216 (1995-03-01), Hall et al.
patent: 5501223 (1996-03-01), Washburn et al.

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