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Evaluation of a bolus/infusion protocol for 11C-ABP688, a PET tracer for mGluR5.

Abstract：

UNLABELLED:(11)C-ABP-688 is a selective tracer for the mGluR5 receptor. Its kinetics is fast and thus favourable for an equilibrium approach to determine receptor-related parameters. The purpose of this study was to test the hypothesis that the pattern of the (11)C-ABP688 uptake using a bolus-plus-infusion (B/I) protocol at early time points corresponds to the perfusion and at a later time point to the total distribution volume. METHODS:A bolus and a B/I study (1 h each) was performed in five healthy male volunteers. With the B/I protocol, early and late scans were normalized to gray matter, cerebellum and white matter. The same normalization was done on the maps of the total distribution volume (Vt) and K(1) which were calculated in the study with bolus only injection and the Logan method (Vt) and a two-tissue compartment model (K(1)). RESULTS:There was an excellent correlation close to the identity line between the pattern of the late uptake in the B/I study and Vt of the bolus-only study for all three normalizations. The pattern of the early uptake in the B/I study correlated well with the K(1) maps, but only when normalized to gray matter and cerebellum, not to white matter. CONCLUSION:It is demonstrated that with a B/I protocol the (11)C-ABP688 distribution in late scans reflects the pattern of the total distribution volume and is therefore a measure for the density pattern of mGluR5. The early scans following injection are related to blood flow, although not in a fully quantitative manner. The advantage of the B/I protocol is that no arterial blood sampling is required, which is advantageous in clinical studies.

journal_name

Nucl Med Biol

journal_title

Nuclear medicine and biology

authors

Burger C,Deschwanden A,Ametamey S,Johayem A,Mancosu B,Wyss M,Hasler G,Buck A

doi

10.1016/j.nucmedbio.2010.04.107

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

845-51

issue

7

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(10)00197-6

journal_volume

37

pub_type

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