Compensation for non-uniform attenuation in SPECT brain imaging
Abstract
Photon attenuation is a major limitation in performing quantitative SPECT brain imaging. A number of methods have been proposed for compensation of attenuation in regions of the body that can be modelled as a uniform attenuator. The magnitude of the errors introduced into reconstructed brain images by assuming the head to be a uniform attenuator are uncertain (the skull, sinus cavities and head holder all have different attenuation properties than brain tissue). Brain imaging is unique in that the radioisotope, for the most part, is taken up within a uniform attenuation medium (i.e., brain tissue) which is surrounded by bone (i.e., the skull) of a different density. Using this observation, Bellini`s method for attenuation compensation (which is an exact solution to the exponential Radon transform) has been modified to account for the different attenuation properties of the skull. To test this modified Bellini method, a simple mathematical phantom was designed to model the brain and a skull of varying thickness less than 7.5 mm. To model brain imaging with Tc-99m HMPAO, the attenuation coefficient of the brain tissue and skull were set to 0.15 cm{sup -1} and 0.22 cm{sup -1} respectively. A ray-driven projector which accounted for non-uniform attenuation wasmore »
- Authors:
-
- Univ. of Massachusetts Medical Center, Worcester, MA (United States); and others
- Publication Date:
- OSTI Identifier:
- 198038
- Report Number(s):
- CONF-940605-
Journal ID: JNMEAQ; ISSN 0161-5505; TRN: 95:007029-0180
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Nuclear Medicine
- Additional Journal Information:
- Journal Volume: 35; Journal Issue: Suppl.5; Conference: 41. annual meeting of the Society of Nuclear Medicine, Orlando, FL (United States), 5-8 Jun 1994; Other Information: PBD: May 1994
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 55 BIOLOGY AND MEDICINE, BASIC STUDIES; IMAGES; ERRORS; SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY; PERFORMANCE; ATTENUATION; TECHNETIUM 99
Citation Formats
Glick, S J, King, M A, and Pan, T S. Compensation for non-uniform attenuation in SPECT brain imaging. United States: N. p., 1994.
Web.
Glick, S J, King, M A, & Pan, T S. Compensation for non-uniform attenuation in SPECT brain imaging. United States.
Glick, S J, King, M A, and Pan, T S. 1994.
"Compensation for non-uniform attenuation in SPECT brain imaging". United States.
@article{osti_198038,
title = {Compensation for non-uniform attenuation in SPECT brain imaging},
author = {Glick, S J and King, M A and Pan, T S},
abstractNote = {Photon attenuation is a major limitation in performing quantitative SPECT brain imaging. A number of methods have been proposed for compensation of attenuation in regions of the body that can be modelled as a uniform attenuator. The magnitude of the errors introduced into reconstructed brain images by assuming the head to be a uniform attenuator are uncertain (the skull, sinus cavities and head holder all have different attenuation properties than brain tissue). Brain imaging is unique in that the radioisotope, for the most part, is taken up within a uniform attenuation medium (i.e., brain tissue) which is surrounded by bone (i.e., the skull) of a different density. Using this observation, Bellini`s method for attenuation compensation (which is an exact solution to the exponential Radon transform) has been modified to account for the different attenuation properties of the skull. To test this modified Bellini method, a simple mathematical phantom was designed to model the brain and a skull of varying thickness less than 7.5 mm. To model brain imaging with Tc-99m HMPAO, the attenuation coefficient of the brain tissue and skull were set to 0.15 cm{sup -1} and 0.22 cm{sup -1} respectively. A ray-driven projector which accounted for non-uniform attenuation was used to simulate projection data from 128 views. The detector response and scatter were not simulated. It was observed that reconstructions processed with uniform attenuation compensation (i.e., where it was assumed that the brain tissue and the skull had the same attenuation coefficient) provided errors of 6-20%, whereas those processed with the non-uniform Bellini algorithm were biased by only 0-5%.},
doi = {},
url = {https://www.osti.gov/biblio/198038},
journal = {Journal of Nuclear Medicine},
number = Suppl.5,
volume = 35,
place = {United States},
year = {Sun May 01 00:00:00 EDT 1994},
month = {Sun May 01 00:00:00 EDT 1994}
}