Quantitative SPECT by attenuation correction of the projection set using transmission data: evaluation of a method

Summary, in English

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.

• Författare: Helén Almquist; John Palmer; Michael Ljungberg; Per Wollmer; Sven-Erik Strand; Björn Jonson
• Avdelning/ar: Medicinsk strålningsfysik, Lund; Klinisk fysiologi och nuklearmedicin, Malmö; Klinisk fysiologi, Lund
• Publiceringsår: 1990
• Språk: Engelska
• Sidor: 587-594
• Publikation/Tidskrift/Serie: European Journal Of Nuclear Medicine
• Volym: 16
• Issue: 8-10
• Länkar: http://dx.doi.org/10.1007/BF00998154
• Dokumenttyp: Artikel i tidskrift
• Förlag: Springer
• Ämne: Radiology, Nuclear Medicine and Medical Imaging
• Nyckelord: Attenuation correction; Build-up; Quantitative SPECT; Transmission measurement
• Status: Published
• Forskningsgrupp: Clinical Physiology, Malmö
• ISBN/ISSN/Övrigt: ISSN: 1432-105X