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First published online May 15, 2007
J Nucl Med 2007, doi:10.2967/jnumed.106.035774
 © 2007 by Society of Nuclear Medicine
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Partial-Volume Effect in PET Tumor Imaging

Marine Soret 1, Stephen L. Bacharach 2, and Irène Buvat 3*

1 UMR 678 INSERM-UPMC, CHU Pitié-Salpêtrière, Paris, France; Nuclear Medicine Department, HIA Val-de-Grâce, Paris, France
2 Department of Radiology, University of California, San Francisco, California
3 UMR 678 INSERM-UPMC, CHU Pitié-Salpêtrière, Paris, France

* To whom correspondence should be addressed. E-mail: buvat{at}imed.jussieu.fr.


  Abstract

PET has the invaluable advantage of being intrinsically quantitative, enabling accurate measurements of tracer concentrations in vivo. In PET tumor imaging, indices characterizing tumor uptake, such as standardized uptake values, are becoming increasingly important, especially in the context of monitoring the response to therapy. However, when tracer uptake in small tumors is measured, large biases can be introduced by the partial-volume effect (PVE). The purposes of this article are to explain what PVE is and to describe its consequences in PET tumor imaging. The parameters on which PVE depends are reviewed. Actions that can be taken to reduce the errors attributable to PVE are described. Various PVE correction schemes are presented, and their applicability to PET tumor imaging is discussed.

Key Words: PET, tumor imaging, partial volume, standardized uptake value




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Copyright © 2007 by the Society of Nuclear Medicine.