Title :
Non-uniform attenuation correction using simultaneous transmission and emission converging tomography
Author :
Tung, C.H. ; Gullberg, G.T. ; Zeng, G.L. ; Christian, P.E. ; Datz, E.L. ; Morgan, H.T.
Author_Institution :
Utah Univ., Salt Lake City, UT, USA
Abstract :
Photon attenuation in cardiac single photon emission computed tomography (SPECT) is a major factor contributing to the quantitative inaccuracy and the decrease in sensitivity of lesion detection. A measured map of the attenuation distribution is used in combination with iterative reconstruction algorithms to accurately compensate for the variable attenuation in the chest. The transmission and emission data are acquired simultaneously using a multidetector, fan beam collimated SPECT system with a precisely aligned transmission line source (Tc-99m) at a different energy than the emission source (Tl-201). The contamination of transmission and emission data due to scatter and multiple photopeaks is removed based on measurements from the detectors acquiring only the emission data. The quantitative accuracy of cardiac SPECT is significantly improved using simultaneously acquired transmission and emission data which are obtained in clinically acceptable patient scanning times.<>
Keywords :
computerised tomography; radioisotope scanning and imaging; /sup 201/Tl; /sup 99m/Tc; cardiac imaging; chest; iterative reconstruction algorithms; lesion detection sensitivity; multidetector fan beam collimated SPECT system; multiple photopeaks; nonuniform attenuation correction; patient scanning time; photon attenuation; precisely aligned transmission line source; quantitative accuracy; quantitative inaccuracy; scatter; simultaneous transmission/emission converging tomography; variable attenuation compensation; Attenuation measurement; Collimators; Contamination; Electromagnetic scattering; Lesions; Particle scattering; Pollution measurement; Reconstruction algorithms; Single photon emission computed tomography; Transmission line measurements;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259270