By Topic

Reduction of truncation artifacts in fan beam transmission by using parallel beam emission data

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

6 Author(s)
Tin-Su Pan ; Dept. of Nucl. Med., Massachusetts Univ. Med. Center, Worcester, MA, USA ; M. A. King ; B. C. Penney ; N. Rajeevan
more authors

We describe a method to reduce the truncation artifacts in the fan beam transmission image reconstruction of a simultaneous transmission and emission SPECT system. Parallel hole collimation is adopted for the measurement of both emission photopeak and Compton scatter photons, which are also used to obtain the body and lung outlines. The lung outlines can be refined using attenuation coefficient (μ) estimates from within the fully sampled region (FSR) of the attenuation map computed using the truncated transmission data. The regions of the lungs and other soft tissues are assigned appropriate attenuation coefficients to create the attenuation map with no truncation, which are then reprojected to augment the transmission projection data. A match of the total attenuation between the real and reprojected data is made at each projection angle in each slice to account for the different attenuation coefficients in different slices. Finally, a reconstruction of the combined measured and augmented data is performed. We demonstrate that this method can significantly reduce the truncation artifacts using two phantom studies. When some portion of the heart falls outside the FSR, the attenuation map estimated from this method can more effectively correct for the attenuation in the emission data than the truncated map

Published in:

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

Date of Conference:

30 Oct-5 Nov 1994