Esophageal source measurement of Tc-99m attenuation coefficients for use in left ventricular volume determinations.

Published

Journal Article

A linear attenuation coefficient for water (mu = .15 cm-1) at 140 keV has been used in the determination of left ventricular volumes (LVV) by attenuation-corrected equilibrium methods. This theoretical value ignores the effect of Compton scatter and thus may be too high for human LVV determinations. The effective attenuation coefficient, mu', of the human chest was determined in ten normal volunteers using a Tc-99m esophageal source imaged with a gamma camera. Values for mu' at 30 degrees LAO in end-expiration, quiet breathing, and end-inspiration were .125 +/- .006 cm-1, .125 +/- .005 cm-1, and .113 +/- .007 cm-1, respectively (95% confidence interval). Values of mu' at 45 degrees LAO were .122 +/- .006 cm-1, .119 +/- .007 cm-1, and .099 +/- .009 cm-1, respectively, for the same conditions. The measured value of mu' for the source in a water phantom was .127 +/- .001 cm-1. This suggests that a value of mu' of .125 cm-1 may be appropriate for use in determining LVV in patients.

Full Text

Duke Authors

Cited Authors

  • Fearnow, EC; Jaszczak, RJ; Harris, CC; Stanfield, JA; Coleman, RE

Published Date

  • November 1985

Published In

Volume / Issue

  • 157 / 2

Start / End Page

  • 517 - 520

PubMed ID

  • 2996052

Pubmed Central ID

  • 2996052

International Standard Serial Number (ISSN)

  • 0033-8419

Digital Object Identifier (DOI)

  • 10.1148/radiology.157.2.2996052

Language

  • eng

Conference Location

  • United States