Anti-aliasing weighting functions for multislice helical CT

Patrick J. La Riviere; Xiaochuan Pan

doi:10.1117/12.465580

3 May 2002 Anti-aliasing weighting functions for multislice helical CT

Proceedings Volume 4682, Medical Imaging 2002: Physics of Medical Imaging; (2002) https://doi.org/10.1117/12.465580
Event: Medical Imaging 2002, 2002, San Diego, California, United States

Abstract

We develop a new projection weighting function for interpolation and reconstruction of multi-slice helical computed tomography data with the hope of reducing longitudinal aliasing in reconstructed volumes. The weighting function is based on the application of the Papoulis generalized sampling theorem to the interlaced longitudinal samples acquired by the multi-slice scanner. We call the approach 180MAA, for multi-slice anti-aliasing. For pitch 3, the 180MAA approach yields high-quality images of the 3D Shepp-Logan phantom as well as a longitudinal MTF superior to that of the 180MLI approach, which is based on the use of linear interpolation. However, it is not as successful at mitigating aliasing as had been doped due to the presence of a significant and unexpected aliasing component that can be attributed to the small cone angle in multi-slice helical CT. The presence of this effect is interesting and significant in its own right, however.

Citation Download Citation

Patrick J. La Riviere and Xiaochuan Pan "Anti-aliasing weighting functions for multislice helical CT", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); https://doi.org/10.1117/12.465580

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KEYWORDS

Sensors

Modulation transfer functions

Scanners

Computed tomography

Collimation

Computer simulations

Image filtering

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