Energy window optimization in simultaneous technetium-99m TCT andthallium-201 SPECT data acquisition
Jia Li
Tsui, B.M.W.
Welch, A.
Frey, E.C.
Gullberg, G.T.
Dept. of Biomed. Eng., North Carolina Univ., Chapel Hill, NC;
This paper appears in: Nuclear Science, IEEE Transactions on
Publication Date: Aug 1995
Volume: 42,
Issue: 4
On page(s): 1207-1213
Meeting Date: 10/30/1994 - 11/05/1994
Location: Norfolk, VA, USA
ISSN: 0018-9499
References Cited: 17
CODEN: IETNAE
INSPEC Accession Number: 5053452
Digital Object Identifier: 10.1109/23.467877
Posted online: 2002-08-06 19:12:36.0
Abstract
In simultaneous Tc-99m TCT and Tl-201 SPECT data acquisition, the
emission images are degraded by not only scatter from the emission
source, but also cross-contamination from the transmission photons.
Also, the transmission images are degraded by scatter from the
transmission source and cross-contamination from the emission photons.
In this work, a criterion based on maximizing a figure-of-merit (FOM)
was used to reduce image degradations by optimizing the position and
width of the energy windows used in the data acquisition in a
triple-camera fan-beam SPECT system. The FOM determines a compromise
between increased detection efficiency of primary photons and reduction
of scatter and cross-contamination photons. Scatter in the projection
data was modeled using Monte Carlo (MC) simulation methods. Experimental
studies were performed to verify the simulations and to estimate the
amount of Pb X-rays and scatter in the collimator which were not modeled
in the MC program. Results suggest that cross-contamination degrades the
emission and transmission data. However, the contamination does not
significantly alter the optimal energy window settings, which should be
centered at ~77 keV with a window width of ~34% for detecting the Ti
emission photons, and centered at 140 keV with a window width of ~20%
for detecting the Tc transmission photons
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