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Michael Ljungberg

Michael Ljungberg

Professor

Michael Ljungberg

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

Författare

  • Michael Ljungberg
  • Sven-Erik Strand

Summary, in 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.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

1990

Språk

Engelska

Sidor

1560-1567

Publikation/Tidskrift/Serie

Journal of Nuclear Medicine

Volym

31

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

Society of Nuclear Medicine

Ämne

  • Radiology, Nuclear Medicine and Medical Imaging

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0161-5505