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Artifacts at PET and PET/CT Caused by Metallic Hip Prosthetic Material¹

¹ From the Division of Nuclear Medicine, University Hospital Zurich, Rämistrasse 100, CH-8091 Zurich, Switzerland (G.W.G., C.B., T.B., G.K.v.S., A.B.); and Nuclear Medicine Clinics, Technischen Universität München, Munich, Germany (S.I.Z.). Received January 9, 2002; revision requested March 4; revision received May 1; accepted June 5. G.W.G. supported by an award from the Research and Education Fund of the European Association of Radiology. Address correspondence to G.W.G. (e-mail: gerhard.goerres@dmr.usz.ch).

Hip prosthetic material and a steel rod were scanned in a water bath of fluorine 18 fluorodeoxyglucose (FDG) with positron emission tomographic (PET) and PET/computed tomographic (CT) scanners to evaluate the generation of artifacts adjacent to the metal. The influences of attenuation correction (AC), positioning of the object, and image reconstruction were examined. Use of CT- and germanium 68–based AC resulted in generation of artifacts that mimicked increased FDG uptake. These artifacts were more evident when the object was moved between the emission and transmission scans. When attenuation-weighted iterative reconstruction was used, these artifacts were less evident.

© RSNA, 2003

Index terms: Images, processing • Phantoms • Positron emission tomography (PET), artifact • Stents and prostheses, 442.454 • Test objects

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