Document Detail


Combined corrections for attenuation, depth-dependent blur, and motion in cardiac SPECT: a multicenter trial.
MedLine Citation:
PMID:  11083189     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The diagnostic accuracy of cardiac single photon emission computed tomography (SPECT) is limited by image-degrading factors, such as heart or subject motion, depth-dependent blurring caused by the collimator, and photon scatter and attenuation. We developed correction approaches for motion, depth-dependent blur, and attenuation and performed a multicenter validation. METHODS AND RESULTS: Motion was corrected both transversely and axially with a cross-correlation technique. Depth-dependent blurring was corrected by first back-projecting each projection and then applying a depth-dependent Wiener filter row by row. Attenuation was corrected with an iterative, nonuniform Chang algorithm, based on a transmission scan-generated attenuation map. We validated these approaches in 112 subjects, including 36 women (20 healthy volunteers, 8 angiographically normal patients, and 8 patients with coronary artery disease [CAD] found by means of angiography) and 76 men (23 healthy volunteers, 10 angiographically normal patients, and 43 patients with CAD found by means of angiography). Either technetium 99m or thallium 201 was used for emission; either gadolinium 153 or Tc-99m was used for transmission. Images were reconstructed and blindly interpreted with a 5-point scale for receiver operating characteristic analysis in 2 ways: motion correction plus a Butterworth filter, and combined motion and blur and attenuation corrections. The interpretation by means of consensus was for the overall presence of CAD and vascular territory. The receiver operating characteristic curves for overall presence and each of the 3 main coronary arteries were all shifted upward and to the left and had larger areas under the curve, for combined corrections compared with motion correction and Butterworth. Sensitivity/specificity for motion correction and Butterworth were 84/69, 64/71, 32/94, and 71/81 overall for the left anterior descending, the right coronary artery, and circumflex territories, respectively, compared with 88/92, 77/93, 50/97, and 74/95, respectively, for the combined corrections. CONCLUSIONS: The proposed combined corrections for motion, depth-dependent blur, and attenuation significantly improve diagnostic accuracy, when compared with motion correction alone.
Authors:
J M Links; L C Becker; P Rigo; R Taillefer; L Hanelin; F Anstett; D Burckhardt; L Mixon
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Publication Detail:
Type:  Journal Article; Multicenter Study; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology     Volume:  7     ISSN:  1071-3581     ISO Abbreviation:  J Nucl Cardiol     Publication Date:    2000 Sep-Oct
Date Detail:
Created Date:  2001-01-22     Completed Date:  2001-02-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9423534     Medline TA:  J Nucl Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  414-25     Citation Subset:  IM    
Affiliation:
Johns Hopkins University, Baltimore, MD, USA. jlinks@jhsph.edu
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MeSH Terms
Descriptor/Qualifier:
Coronary Disease / radionuclide imaging*
Coronary Vessels / radionuclide imaging
Female
Heart / radionuclide imaging*
Humans
Image Processing, Computer-Assisted*
Male
ROC Curve
Radiopharmaceuticals / diagnostic use
Sensitivity and Specificity
Tomography, Emission-Computed, Single-Photon*
Chemical
Reg. No./Substance:
0/Radiopharmaceuticals

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


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