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European Journal of Nuclear Medicine and Molecular Imaging
Published in: European Journal of Nuclear Medicine and Molecular Imaging 9/2009

Open Access 01-09-2009 | Original Article

Targeting murine heart and brain: visualisation conditions for multi-pinhole SPECT with 99mTc- and 123I-labelled probes

Authors: M. Pissarek, J. Meyer-Kirchrath, T. Hohlfeld, S. Vollmar, A. M. Oros-Peusquens, U. Flögel, C. Jacoby, U. Krügel, N. Schramm

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 9/2009

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Abstract

Purpose

The study serves to optimise conditions for multi-pinhole SPECT small animal imaging of 123I- and 99mTc-labelled radiopharmaceuticals with different distributions in murine heart and brain and to investigate detection and dose range thresholds for verification of differences in tracer uptake.

Methods

A Triad 88/Trionix system with three 6-pinhole collimators was used for investigation of dose requirements for imaging of the dopamine D2 receptor ligand [123I]IBZM and the cerebral perfusion tracer [99mTc]HMPAO (1.2–0.4 MBq/g body weight) in healthy mice. The fatty acid [123I]IPPA (0.94 ± 0.05 MBq/g body weight) and the perfusion tracer [99mTc]sestamibi (3.8 ± 0.45 MBq/g body weight) were applied to cardiomyopathic mice overexpressing the prostaglandin EP3 receptor.

Results

In vivo imaging and in vitro data revealed 45 kBq total cerebral uptake and 201 kBq cardiac uptake as thresholds for visualisation of striatal [123I]IBZM and of cardiac [99mTc]sestamibi using 100 and 150 s acquisition time, respectively. Alterations of maximal cerebral uptake of [123I]IBZM by >20% (116 kBq) were verified with the prerequisite of 50% striatal of total uptake. The labelling with [99mTc]sestamibi revealed a 30% lower uptake in cardiomyopathic hearts compared to wild types. [123I]IPPA uptake could be visualised at activity doses of 0.8 MBq/g body weight.

Conclusion

Multi-pinhole SPECT enables detection of alterations of the cerebral uptake of 123I- and 99mTc-labelled tracers in an appropriate dose range in murine models targeting physiological processes in brain and heart. The thresholds of detection for differences in the tracer uptake determined under the conditions of our experiments well reflect distinctions in molar activity and uptake characteristics of the tracers.
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Metadata
Title
Targeting murine heart and brain: visualisation conditions for multi-pinhole SPECT with 99mTc- and 123I-labelled probes
Authors
M. Pissarek
J. Meyer-Kirchrath
T. Hohlfeld
S. Vollmar
A. M. Oros-Peusquens
U. Flögel
C. Jacoby
U. Krügel
N. Schramm
Publication date
01-09-2009
Publisher
Springer-Verlag
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 9/2009
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-009-1142-9

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