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BMC Medical Physics

, 9:2

First Online: 29 January 2009Received: 27 June 2008Accepted: 29 January 2009


BackgroundWe evaluated the repeatability of the calculation of myocardial blood flow MBF at rest and pharmacological stress, and calculated the coronary flow reserve CFR utilizing Rb PET imaging. The aim of the research was to prove high repeatability for global MBF and CFR values and good repeatability for regional MBF and CFR values. The results will have significant impact on cardiac PET imaging in terms of making it more affordable and increasing its use.

Methods12 normal volunteers were imaged at rest and during pharmacological stress, with 2220 MBq of Rb each. A GE Advance PET system was used to acquire dynamic 50-frame studies. MBF was calculated with a 2-compartmental model using a modified PMOD program PMOD; University Hospital Zurich, Zurich, Switzerland. Two differential equations, describing a 2-compartmental model, were solved by numerical integration and using Levenberg-Marquardt-s method for fitting data. The PMOD program defines 16 standard segments and calculates myocardial flow for each segment, as well as average septal, anterior, lateral, inferior and global flow. Repeatability was evaluated according to the method of Bland and Altman.

ResultsGlobal rest and stress MBF, as well as global CFR, showed very good repeatability. No significant differences were found between the paired resting global MBF 0.63 ± 0.13 vs. 0.64 ± 0.13 mL-min-g; mean difference -1.0% ± 2.6% and the stress global MBF 1.37 ± 0.23 vs. 1.37 ± 0.24; mean difference, 0.1% ± 2.3%. Global CFR was highly reproducible 2.25 ± 0.56 vs. 2.22 ± 0.54, P = not statistically significant; mean difference, 1.3% ± 14.3%. Repeatability coefficients for global rest MBF were 0.033 5.2% and stress MBF 0.062 4.5% mL-min-g. Regional rest and stress MBF and CFR have shown good reproducibility. The average per sector repeatability coefficients for rest MBF were 0.056 8.5% and stress MBF 0.089 6.3% mL-min-g, and average repeatability coefficient for CFR was 0.25 10.6%.

ConclusionThe results of the study show that software calculation of MBF and CFR with Rb myocardial PET imaging is highly repeatable for global values and has good repeatability for regional values.

Electronic supplementary materialThe online version of this article doi:10.1186-1756-6649-9-2 contains supplementary material, which is available to authorized users.

Karin Knešaurek, Josef Machac contributed equally to this work.

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Autor: Karin Knešaurek - Josef Machac - Zhuangyu Zhang


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