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DOI: 10.1148/radiol.2372041719
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Comparison of Alignment of Computer-registered Data Sets: Combined PET/CT versus Independent PET and CT of the Thorax1

Vikram Krishnasetty, MD, Alan J. Fischman, MD, Elkan L. Halpern, PhD and Suzanne L. Aquino, MD

1 From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, FND 202, Boston, MA 02114. From the 2004 RSNA Annual Meeting. Received October 5, 2004; revision requested December 13; revision received January 11, 2005; accepted February 16. Address correspondence to S.L.A. (e-mail: saquino{at}partners.org).



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  		Figure 1. Transverse (left), coronal (middle), and sagittal (right) views from fusion of PET and CT data sets from combined PET/CT. The quality of fusion for both the heart and diaphragm was rated as 5. Arrow = exact alignment of the heart, arrowhead = exact alignment of the diaphragm.

 


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  		Figure 2. Transverse (left), coronal (middle), and sagittal (right) views from fusion of PET data sets from combined PET/CT and unmatched, separately acquired thoracic CT. The quality of alignment for both the diaphragm and heart was rated as 3 since alignment differed by more than 5 but less than 25 mm. Arrow = poor alignment of the heart, arrowhead = poor alignment of the diaphragm.

 


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  		Figure 3. Transverse (left), coronal (middle), and sagittal (right) views from fusion of separate PET and CT data sets matched for patient positioning and breath hold. The quality of fusion for both the heart and diaphragm was rated as 5. Arrow = exact alignment of the heart, arrowhead = exact alignment of the diaphragm.

 




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