Document Detail

Attenuation correction of myocardial SPECT images with X-ray CT: effects of registration errors between X-ray CT and SPECT.
MedLine Citation:
PMID:  12416584     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Attenuation correction with an X-ray CT image is a new method to correct attenuation on SPECT imaging, but the effect of the registration errors between CT and SPECT images is unclear. In this study, we investigated the effects of the registration errors on myocardial SPECT, analyzing data from a phantom and a human volunteer. METHODS: Registerion (fusion) of the X-ray CT and SPECT images was done with standard packaged software in three dimensional fashion, by using linked transaxial, coronal and sagittal images. In the phantom study, an X-ray CT image was shifted 1 to 3 pixels on the x, y and z axes, and rotated 6 degrees clockwise. Attenuation correction maps generated from each misaligned X-ray CT image were used to reconstruct misaligned SPECT images of the phantom filled with 201Tl. In a human volunteer, X-ray CT was acquired in different conditions (during inspiration vs. expiration). CT values were transferred to an attenuation constant by using straight lines; an attenuation constant of 0/cm in the air (CT value = -1,000 HU) and that of 0.150/cm in water (CT value = 0 HU). For comparison, attenuation correction with transmission CT (TCT) data and an external gamma-ray source (99mTc) was also applied to reconstruct SPECT images. RESULTS: Simulated breast attenuation with a breast attachment, and inferior wall attenuation were properly corrected by means of the attenuation correction map generated from X-ray CT. As pixel shift increased, deviation of the SPECT images increased in misaligned images in the phantom study. In the human study, SPECT images were affected by the scan conditions of the X-ray CT. CONCLUSION: Attenuation correction of myocardial SPECT with an X-ray CT image is a simple and potentially beneficial method for clinical use, but accurate registration of the X-ray CT to SPECT image is essential for satisfactory attenuation correction.
Yasuyuki Takahashi; Kenya Murase; Hiroshi Higashino; Teruhito Mochizuki; Nobutoku Motomura
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Publication Detail:
Type:  Comparative Study; Technical Report    
Journal Detail:
Title:  Annals of nuclear medicine     Volume:  16     ISSN:  0914-7187     ISO Abbreviation:  Ann Nucl Med     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-11-05     Completed Date:  2003-04-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8913398     Medline TA:  Ann Nucl Med     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  431-5     Citation Subset:  IM    
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MeSH Terms
Heart / radiography*,  radionuclide imaging*
Image Enhancement / methods*
Phantoms, Imaging
Quality Control
Radiopharmaceuticals / diagnostic use
Reference Values
Reproducibility of Results
Sensitivity and Specificity
Subtraction Technique*
Technetium / diagnostic use
Thallium / diagnostic use
Tomography, Emission-Computed, Single-Photon / methods*
Tomography, X-Ray Computed / methods*
Reg. No./Substance:
0/Radiopharmaceuticals; 7440-26-8/Technetium; 7440-28-0/Thallium; 7791-12-0/thallium chloride

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

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