title: A count-based algorithm for attenuation-corrected volume determination using data from an external flood source.
abstract: We discuss the basic features of a count-based algorithm for attenuation-corrected volume determination, for use with planar gamma camera images. The attenuation correction is arrived at by combining the results of two 180 degrees opposed images with a transmission image obtained with an external flood source. A sample of the imaged radioactive volume is used to convert the attenuation-corrected count to an absolute volume. The algorithm is best suited to the measurement of small to medium-sized volumes of uniform activity, such as are encountered in cardiac blood-pool imaging.
mesh_terms: D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D008961:Models, Structural; D011877:Radionuclide Imaging / Q000379:methods*