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Scatter and attenuation correction in SPECT using density maps and Monte Carlo simulated scatter functions

Author:
  • Michael Ljungberg
  • Sven-Erik Strand
Publishing year: 1990
Language: English
Pages: 1560-1567
Publication/Series: Journal of Nuclear Medicine
Volume: 31
Issue: 9
Document type: Journal article
Publisher: Society of Nuclear Medicine

Abstract english

A new scatter and attenuation correction method is presented in which Monte Carlo simulated scatter line-spread functions for different depth and lateral positions are used. A reconstructed emission image is used as an estimate of the source distribution in order to calculate the scatter contribution in the projection data. The scatter contribution is then subtracted from the original projection prior to attenuation correction. The attenuation correction method uses density maps for the attenuation correction of projection data. Simulation studies have been done with a clinically realistic source distribution in cylindrical, homogeneous water phantoms of different sizes and with photon energies corresponding to 201T1, 99mTc, and 111In. The results show excellent quantitative results with an accuracy within +/- 10% for most of the source positions and phantom sizes. It has also been shown that the variation in the event distribution within the source region in the images has been significantly decreased and that an enhancement in the contrast has been achieved.

Keywords

  • Radiology, Nuclear Medicine and Medical Imaging

Other

Published
  • ISSN: 0161-5505
Sven-Erik Strand
E-mail: sven-erik [dot] strand [at] med [dot] lu [dot] se

Project manager

Systemic Radiation Therapy Group

32

Professor emeritus

Medical Radiation Physics, Lund

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