| Literature DB >> 2384099 |
H Almquist1, J Palmer, M Ljungberg, P Wollmer, S E Strand, B Jonson.
Abstract
A method for measuring attenuation coefficients in single-photon emission tomography (SPECT) is described and evaluated, together with a method for attenuation correction using these measured attenuation coefficients. Build-up, caused by scattered photons, is corrected for by a simple substitution in the algorithms. Transmission studies are performed with a 99mTc- or 57Co flood source, and emission phantom studies with 99mTc line sources. The method is evaluated with variable but well-defined phantoms. The result is accurate attenuation coefficients for different densities, dimensions and geometries, and an accuracy of corrected emission activities of better than +/- 10% in most cases. The present limitations of the method for attenuation correction are discussed.Mesh：
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Year: 1990 PMID： 2384099 DOI： 10.1007/bf00998154
Source DB: PubMed Journal: Eur J Nucl Med ISSN： 0340-6997