PMID: 15377089Sep 21, 2004Paper

The frequency split method for helical cone-beam reconstruction

Medical Physics
G ShechterRoland Proksa

Abstract

A new approximate method for the utilization of redundant data in helical cone-beam CT is presented. It is based on the observation that the original WEDGE method provides excellent image quality if only little more than 180 degrees data are used for back-projection, and that significant low-frequency artifacts appear if a larger amount of redundant data are used. This degradation is compensated by the frequency split method: The low-frequency part of the image is reconstructed using little more than 180 degrees of data, while the high frequency part is reconstructed using all data. The resulting algorithm shows no cone-beam artifacts in a simulation of a 64-row scanner. It is further shown that the frequency split method hardly degrades the signal-to-noise ratio of the reconstructed images and that it behaves robustly in the presence of motion.

References

May 8, 1998·Physics in Medicine and Biology·K C TamF Sauer
Mar 24, 2000·Physics in Medicine and Biology·M DefriseH Kudo
Dec 29, 2000·IEEE Transactions on Medical Imaging·R ProksaJ Timmer
Aug 31, 2002·Physics in Medicine and Biology·Alexander Katsevich
Oct 8, 2003·Medical Physics·Claas BontusRoland Proksa
Jul 14, 2004·Physics in Medicine and Biology·D HeuscherF Noo

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Citations

Jul 11, 2009·Physics in Medicine and Biology·Harald SchöndubeFrédéric Noo
Dec 23, 2008·AJR. American Journal of Roentgenology·Yoshinori FunamaYasuyuki Yamashita
Apr 10, 2012·Medical Physics·Esther MeyerMarc Kachelrieß
Oct 10, 2008·Medical Physics·Johan Sunnegårdh, Per-Erik Danielsson
Dec 24, 2005·Radiology·Anthony B Wolbarst, William R Hendee
Dec 17, 2010·Medical Physics·M PetersilkaT Flohr
Jul 1, 2011·Medical Physics·Thomas KöhlerRoland Proksa
Jun 1, 2014·Medical Physics·Kriti Sen SharmaGuohua Cao
Feb 13, 2009·IEEE Transactions on Medical Imaging·Alexander KatsevichMichael D Silver
Jul 11, 2006·IEEE Transactions on Medical Imaging·Thomas KöhlerPeter Koken
Jul 20, 2007·Physics in Medicine and Biology·P ForthmannM Defrise

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