68Ga-DOTA-NOC PET/CT imaging of neuroendocrine tumors: comparison with ¹¹¹In-DTPA-octreotide (OctreoScan®).

Molecular Imaging and Biology : MIB : the Official Publication of the Academy of Molecular Imaging
Yodphat KrauszDavid J Gross

Abstract

Recent data have indicated that ⁶⁸Ga-DOTA-NOC positron emission tomography/X-ray computed tomography (PET/CT) may yield improved images in a shorter acquisition protocol than ¹¹¹In-DTPA-octreotide (OctreoScan®, OCT). Therefore, we performed a prospective comparison of ⁶⁸Ga-DOTA-NOC and OCT for the detection of neuroendocrine tumors (NETs). Nineteen patients (eight carcinoid, nine pancreatic NETs, and two NE carcinoma of unknown origin) with previous positive OCT scans underwent ⁶⁸Ga-DOTA-NOC PET/CT and OCT single-photon emission computed tomography imaging for staging or follow-up. Findings were compared by region and verified with conventional imaging. All images of both modalities demonstrated focal uptake, often at multiple sites. ⁶⁸Ga-DOTA-NOC images were clearer than OCT images, facilitating interpretation. Similar foci were identified with both modalities in 41 regions, with additional foci on ⁶⁸Ga-DOTA-NOC in 21 and on OCT in 15 regions. CT, magnetic resonance imaging, or ultrasound confirmed the concordant findings in 31 of 41 regions and findings seen with ⁶⁸Ga-DOTA-NOC only in 15 of 21 regions. Findings seen with OCT only were less clear and were only confirmed in 4 of 15 regions. ⁶⁸Ga-DOTA-NOC had impact on staging i...Continue Reading

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