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European Journal of Nuclear Medicine and Molecular Imaging

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01.11.2007 | Original Article

Quantification of myocardial blood flow with ⁸²Rb dynamic PET imaging

verfasst von: Mireille Lortie, Rob S. B. Beanlands, Keiichiro Yoshinaga, Ran Klein, Jean N. DaSilva, Robert A. deKemp

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 11/2007

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Abstract

Purpose

The PET tracer ⁸²Rb is commonly used to evaluate regional perfusion defects for the diagnosis of coronary artery disease. There is limited information on the quantification of myocardial blood flow and flow reserve with this tracer. The goal of this study was to investigate the use of a one-compartment model of ⁸²Rb kinetics for the quantification of myocardial blood flow.

Methods

Fourteen healthy volunteers underwent rest and dipyridamole stress imaging with both ¹³N-ammonia and ⁸²Rb within a 2-week interval. Myocardial blood flow was estimated from the time-activity curves measured with ¹³N-ammonia using a standard two-compartment model. The uptake parameter of the one-compartment model was estimated from the time-activity curves measured with ⁸²Rb. To describe the relationship between myocardial blood flow and the uptake parameter, a nonlinear extraction function was fitted to the data. This function was then used to convert estimates of the uptake parameter to flow estimates. The extraction function was validated with an independent data set obtained from 13 subjects with documented evidence of coronary artery disease (CAD).

Results

The one-compartment model described ⁸²Rb kinetics very well (median R-square = 0.98). The flow estimates obtained with ⁸²Rb were well correlated with those obtained with ¹³N-ammonia (r = 0.85), and the best-fit line did not differ significantly from the identity line. Data obtained from the subjects with CAD confirmed the validity of the estimated extraction function.

Conclusion

It is possible to obtain accurate estimates of myocardial blood flow and flow reserve with a one-compartment model of ⁸²Rb kinetics and a nonlinear extraction function.

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Titel: Quantification of myocardial blood flow with 82Rb dynamic PET imaging
verfasst von: Mireille Lortie
Rob S. B. Beanlands
Keiichiro Yoshinaga
Ran Klein
Jean N. DaSilva
Robert A. deKemp
Publikationsdatum: 01.11.2007
Verlag: Springer-Verlag
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 11/2007
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-007-0478-2

Springer Medizin

Abstract

Purpose

Methods

Results

Conclusion

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