By Topic

Detailed investigation of transmission and emission data smoothing protocols and their effects on emission images

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
A. Chatziioannou ; Sch. of Med., California Univ., Los Angeles, CA, USA ; M. Dahlbom

Measured attenuation correction in PET, is routinely performed using transmission scans. Acquisition time and noise considerations necessitate low pass filtering of the transmission data, before generating the attenuation correction matrix. This smoothing operation reduces noise propagation from transmission into emission data, but also introduces image artifacts which are mostly pronounced around areas of strongly varying attenuation coefficients. The source of these artifacts, which lies in the mismatch of the spatial resolutions of emission and transmission data, was investigated in this study. The effects of different transmission and emission sinogram smoothing protocols on the emission images were also investigated. A method is proposed that addresses the problem, in coordination with the filtering step during reconstruction. Instead of the standard low pass filtering of the emission data during reconstruction, emission and transmission sinograms can be filtered to the desired reconstructed image resolution prior to reconstruction. This operation reduces or eliminates resolution mismatch and consequent image artifacts, which can be significant, especially in cardiac studies. The proposed method improves the accuracy of the activity distribution in the emission images, with minimal computational and SNR cost

Published in:

Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record  (Volume:4 )

Date of Conference:

30 Oct-5 Nov 1994