Single-Detector Helical CT in PET–CT: Assessment of Image Quality
Wolfgang Römer1,2,
Margaret Chung1,
Andrew Chan1,
David W. Townsend1,3,
Frank Torok1,
Barry McCook1,
Michael P. Federle1 and
Norbert Avril1
1 Department of Radiology, University of Pittsburgh Medical Center, 200 Lothrop
St., Pittsburgh, PA 15213.
2 Present address: Institute of Diagnostic Radiology, University of
Erlangen-Nuremberg, Maximiliansplatz 1, Erlangen 91054, Germany.
3 Present address: Department of Medicine, University of Tennessee Medical
Center, 1924 Alcoa Hwy., Knoxville, TN 37920.
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Fig. 1A. —53-year-old man with non-Hodgkin's lymphoma. Axial CT scan
obtained with the patient's arms positioned beside body shows severe streak
artifacts (arrow) caused by arms in posterior part of trunk.
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Fig. 1B. —53-year-old man with non-Hodgkin's lymphoma. No artifacts are
seen on axial CT scan obtained 3 months later at same level and with identical
scanning parameters as A with patient's arms raised above body.
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Fig. 2A. —69-year-old man with non-Hodgkin's lymphoma. IV
contrast–enhanced axial CT scan obtained through upper thorax shows
severe streak artifacts (arrow) from highly concentrated contrast
material in left subclavian vein (asterisk).
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Fig. 2B. —69-year-old man with non-Hodgkin's lymphoma. Coronal
multiplanar image reconstructed from CT data in A shows contrast
material with high density in left subclavian vein (asterisk).
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Fig. 2C. —69-year-old man with non-Hodgkin's lymphoma.
Attenuation-corrected axial positron emission tomography (PET) scan obtained
at same location as A shows artificial focal enhancement
(arrow) due to overestimation of attenuation.
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Fig. 2D. —69-year-old man with non-Hodgkin's lymphoma.
Attenuation-corrected coronal PET scan obtained at same location as B
shows artificial focal enhancement (arrow) due to overestimation of
attenuation.
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Fig. 2E. —69-year-old man with non-Hodgkin's lymphoma. On
non–attenuation-corrected axial PET scan obtained at same location as
A and C, no focal enhancement is seen, proving hot spot in
attenuation-corrected image C is artifact.
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Fig. 2F. —69-year-old man with non-Hodgkin's lymphoma. On
non–attenuation-corrected coronal PET scan obtained at same location as
B and D, no focal enhancement is seen, proving hot spot in
attenuation-corrected image D is artifact.
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Fig. 3A. —50-year-old man with non-Hodgkin's lymphoma involving liver.
Dotted line indicates identical positions on each image. Coronal CT scan shows
hypodense liver lesions (arrows). Movement of diaphragm during
scanning caused liver dome to be imaged twice.
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Fig. 3B. —50-year-old man with non-Hodgkin's lymphoma involving liver.
Dotted line indicates identical positions on each image. Coronal FDG positron
emission tomography (PET) scan obtained at same location as A shows
liver lesions (arrows) with enhanced FDG uptake corresponding to
lesions on CT scan (A).
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Fig. 3C. —50-year-old man with non-Hodgkin's lymphoma involving liver.
Dotted line indicates identical positions on each image. Fused PET–CT
scan obtained at same location as A and B shows misregistration
of identical lesions (arrows) in PET and CT scans due to breathing
motion.
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Copyright © 2004 by the American Roentgen Ray Society.
