Document Detail


Contribution of scatter and attenuation compensation to SPECT images of nonuniformly distributed brain activities.
MedLine Citation:
PMID:  12679393     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Correction of scatter and attenuation is essential for quantitative SPECT. In this work, we evaluated the accuracy gained from a method of transmission-dependent convolution subtraction (TDCS) in the quantitation of activity that is highly concentrated in the striatum (STR). METHODS: SPECT data were acquired from an (123)I-containing phantom with a constant activity in the STR but differing background (BKG) activities, so as to simulate various STR/BKG ratios (19.7:1, 9.7:1, 4.8:1, 1.9:1, and 1:1). In a study of healthy humans (n = 6), a transmission scan followed by an emission scan was performed 24 h after injection of (123)I-2beta-carbomethoxy-3beta-(4-iodophenyl)-tropane ((123)I-beta-CIT). All SPECT data was reconstructed with ordered-subset expectation maximization. TDCS was applied for scatter correction. Values of activity in the STR and occipital lobe (for BKG) were used to calculate binding potential V(3)" (= [STR - BKG]/BKG). The effect of SPECT collimator dependency on scatter correction was also evaluated for 6 collimators from 3 different SPECT cameras in the phantom experiment. RESULTS: Scatter correction in the phantom experiment increased the measured values of STR activity (36.2%), resulting in a substantial increase in V(3)" (66.1%). Scatter and attenuation corrections with recovery correction showed an overall bias of -7.3% for the STR, -4.0% for BKG activity, and -7.8% for V(3)". TDCS corrections of phantom activities were relatively uniform for the 6 different collimators, with variabilities of <5.5% for the STR and <3.0% for BKG activities. TDCS correction of human (123)I-beta-CIT images was of a similar, although slightly larger, magnitude than for the phantom data, with increased V(3)" values of 9.4 +/- 2.3 and 4.9 +/- 0.6, with and without scatter correction, respectively. CONCLUSION: The TDSC method significantly improved the accuracy of SPECT images with a nonuniform distribution of activity highly concentrated in central regions. The value of V(3)" was significantly increased in phantom and human data, with most of the improvement derived from an increase in STR activity. This scatter correction method was approximately equally useful with data from the 6 different collimators and is recommended for more accurate quantitation of nonuniformly distributed brain activities.
Authors:
Kyeong Min Kim; Andrea Varrone; Hiroshi Watabe; Miho Shidahara; Masahiro Fujita; Robert B Innis; Hidehiro Iida
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of nuclear medicine : official publication, Society of Nuclear Medicine     Volume:  44     ISSN:  0161-5505     ISO Abbreviation:  J. Nucl. Med.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-07     Completed Date:  2003-05-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217410     Medline TA:  J Nucl Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  512-9     Citation Subset:  IM    
Affiliation:
Department of Investigative Radiology, National Cardiovascular Center Research Institute, 5-7-1 Fujishiro-dai, Suita City, Osaka 565-8565, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Brain / radionuclide imaging*
Cocaine / analogs & derivatives*,  diagnostic use*
Female
Humans
Image Enhancement / methods*
Iodine Radioisotopes / diagnostic use*
Male
Phantoms, Imaging
Quality Control
Radiopharmaceuticals / diagnostic use
Reproducibility of Results
Scattering, Radiation
Sensitivity and Specificity
Subtraction Technique*
Tomography, Emission-Computed, Single-Photon / methods*
Chemical
Reg. No./Substance:
0/Iodine Radioisotopes; 0/Radiopharmaceuticals; 133647-95-7/RTI 55; 50-36-2/Cocaine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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