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. 2017 Dec;7(1):54.
doi: 10.1186/s13550-017-0301-4. Epub 2017 Jun 20.

Test-retest reproducibility of [11C]-L-deprenyl-D2 binding to MAO-B in the human brain

Ryosuke Arakawa  1 , Per Stenkrona  2 , Akihiro Takano  2 , Sangram Nag  2 , Rafael S Maior  2   3 , Christer Halldin  2
Affiliations

Test-retest reproducibility of [11C]-L-deprenyl-D2 binding to MAO-B in the human brain

Ryosuke Arakawa et al. EJNMMI Res. 2017 Dec.

Abstract

Background: [11C]-L-deprenyl-D2 is a positron emission tomography (PET) radioligand for measurement of the monoamine oxidase B (MAO-B) activity in vivo brain. The estimation of the test-retest reproducibility is important for accurate interpretation of PET studies.

Results: We performed two [11C]-L-deprenyl-D2 scans for six healthy subjects and evaluated the test-retest variability of this radioligand. MAO-B binding was quantified by two tissue compartment model (2TCM) with three rate constants (K 1, k 2, k 3) using metabolite-corrected plasma radioactivity. The λk 3 defined as (K 1/k 2) × k 3 was also calculated. The correlation between MAO-B binding and age, and the effect of partial volume effect correction (PVEc) for the reproducibility were also estimated. %difference of k 3 was 2.6% (medial frontal cortex) to 10.3% (hippocampus), and that of λk 3 was 5.0% (thalamus) to 9.2% (cerebellum). Mean %difference of all regions were 5.3 and 7.0% in k 3 and λk 3, respectively. All regions showed below 10% variabilities except the hippocampus in k 3 (10.3%). Intraclass correlation coefficient (ICC) of k 3 was 0.78 (hippocampus) to 0.98 (medial frontal cortex), and that of λk 3 was 0.78 (hippocampus) to 0.95 (thalamus). Mean ICC were 0.94 and 0.89 in k 3 and λk 3, respectively. The highest positive correlation with age was observed in the hippocampus, as r = 0.75 in k 3 and 0.76 in λk 3. After PVEc, mean %difference were 5.6 and 7.2% in k 3 and λk 3, respectively. Mean ICC were 0.92 and 0.90 for k 3 and λk 3, respectively. These values were almost the same as those before PVEc.

Conclusions: The present results indicate that k 3 and λk 3 of [11C]-L-deprenyl-D2 are reliable parameters for test-retest reproducibility with healthy subjects both before and after PVEc. The studies with patients of larger sample size are required for further clinical applications.

Keywords: Age effect; Monoamine oxidase B; Partial volume effect correction; Positron emission tomography; Test-retest variability; [11C]-L-deprenyl-D2.

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Figures

Fig. 1
Fig. 1
The relationship between age and a k 3 or b λk 3 of six subjects
Fig. 2
Fig. 2
The relationship between age and %change of parameters (K 1, k 2, k 3, and λk 3) after PVEc of six subjects
See this image and copyright information in PMC

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