Temporal bone volumetric image deblurring in spiral computed tomography scanning

Academic Radiology
G WangM W Vannier

Abstract

We developed a method for volumetric image deblurring in spiral (helical) computed tomography (CT) scanning with a three-dimensional (3D) Gaussian point spread function (PSF) to improve the quality of temporal bone spiral CT images for assessing the position of cochlear implants electrodes. A patient was scanned after cochlear implantation, and the temporal bone was reconstructed into a volume with 128 voxels per dimension, 0.1 mm per voxel side, and x 10 gray-scale expansion. The 3D PSF in spiral CT imaging was assumed to be Gaussian separable transversely and longitudinally. Standard deviations of the PSF were derived and subjectively adjusted. The image was then deconvolved using Wiener filtering and maximum-likelihood deconvolution methods. Image quality was assessed both visually and quantitatively using cross-sectional area at half of the maximum (CAHM) of the implanted array as the figure of merit. Substantial image deblurring was achieved via deconvolution. Subjectively, anatomic structures were more clearly shown. Deconvolution reduced the CAHM by approximately one third, on average. Three-dimensional deconvolution had better image quality than two-dimensional deconvolution. The maximum-likelihood method produced super...Continue Reading

References

Nov 1, 1990·Medical Physics·C R Crawford, K F King
Nov 1, 1994·Radiology·F J SchlueterM W Vannier
Mar 1, 1994·Journal of Computer Assisted Tomography·W A KalenderC Süss
Nov 1, 1993·Medical Physics·G Wang, M W Vannier
Jan 1, 1982·IEEE Transactions on Medical Imaging·L A Shepp, Y Vardi

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Citations

Jan 11, 2007·Investigative Radiology·Empar Rollano-HijarrubiaRik Stokking
May 2, 2009·Journal of Applied Physiology·George R WashkoJohn J Reilly
Jan 7, 2014·Medical Physics·Amirreza PakdelCari M Whyne
Feb 27, 2009·IEEE Transactions on Medical Imaging·Empar Rollano-HijarrubiaWiro J Niessen
Aug 4, 1998·IEEE Transactions on Medical Imaging·G WangG W Harding
Jun 24, 2000·IEEE Transactions on Information Technology in Biomedicine : a Publication of the IEEE Engineering in Medicine and Biology Society·S K YooM W Vannier
Nov 3, 2005·Physics in Medicine and Biology·Gil Schwarzband, Nahum Kiryati
May 20, 2003·Journal of Applied Physiology·Osama I SabaJoseph M Reinhardt

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