Title :
Simultaneous transmission/emission imaging for SPECT using energy spectrum fitting
Author :
Kaplan, MS ; Haynor, DR ; Miyaoka, RS ; Lewellen, Tk ; Harrison, RL
Author_Institution :
Washington Univ., Seattle, WA, USA
fDate :
30 Oct-5 Nov 1994
Abstract :
Energy information is used to generate emission (99mTc, Eγ=140 keV) and transmission (57Co, Eγ=122 keV) images from a combined projection data set. These components are separated from each other and from Compton scatter by fitting the spectra at each pixel with a simple model. The method is tested using a cylindrical phantom containing inserts with differing attenuation. Emission and transmission position and energy (xyE) data were acquired in list mode and later summed to simulate simultaneous acquisition. Therefore, the true emission and transmission images are known. The quality and quantitative accuracy of the technique are evaluated by comparing images extracted from the combined data set to the “true” scatter-corrected transmission and emission images, respectively. These results are presented and the potential of this technique for accurate attenuation correction in SPECT is discussed
Keywords :
curve fitting; image reconstruction; medical image processing; single photon emission computed tomography; spectral analysis; 122 keV; 140 keV; 57Co; 99mTc; Compton scatter correction; SPECT; attenuation correction; combined projection data set; cylindrical phantom; emission imaging; energy data; energy spectrum fitting; image separation; nuclear medicine image accuracy; position data; scatter-corrected emission images; scatter-corrected transmission images; simultaneous acquisition simulation; transmission imaging; Attenuation measurement; Collimators; Crosstalk; Data mining; Gamma rays; Imaging phantoms; Isotopes; Pixel; Scattering; Testing;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474726
