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

Volume

4

fYear

1994

fDate

30 Oct-5 Nov 1994

Firstpage

1749

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record

Conference_Location

Norfolk, VA

Print_ISBN

0-7803-2544-3

Type

conf

DOI

10.1109/NSSMIC.1994.474726

Filename

474726