Abstract
Objective
Head motion during 30-min (six 5-min frames) brain PET scans starting 30 min post-injection of FDG was evaluated together with the effect of post hoc motion correction between frames in J-ADNI multicenter study carried out in 24 PET centers on a total of 172 subjects consisting of 81 normal subjects, 55 mild cognitive impairment (MCI) and 36 mild Alzheimer’s disease (AD) patients.
Methods
Based on the magnitude of the between-frame co-registration parameters, the scans were classified into six levels (A–F) of motion degree. The effect of motion and its correction was evaluated using between-frame variation of the regional FDG uptake values on ROIs placed over cerebral cortical areas.
Result
Although AD patients tended to present larger motion (motion level E or F in 22 % of the subjects) than MCI (3 %) and normal (4 %) subjects, unignorable motion was observed in a small number of subjects in the latter groups as well. The between-frame coefficient of variation (SD/mean) was 0.5 % in the frontal, 0.6 % in the parietal and 1.8 % in the posterior cingulate ROI for the scans of motion level 1. The respective values were 1.5, 1.4, and 3.6 % for the scans of motion level F, but reduced by the motion correction to 0.5, 0.4 and 0.8 %, respectively. The motion correction changed the ROI value for the posterior cingulate cortex by 11.6 % in the case of severest motion.
Conclusion
Substantial head motion occurs in a fraction of subjects in a multicenter setup which includes PET centers lacking sufficient experience in imaging demented patients. A simple frame-by-frame co-registration technique that can be applied to any PET camera model is effective in correcting for motion and improving quantitative capability.
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Acknowledgments
This study is a part of the “Translational Research Promotion Project/Research project for the development of a systematic method for the assessment of Alzheimer’s disease,” sponsored by the New Energy and Industrial Technology Development Organization (NEDO) of Japan. J-ADNI is also supported by a Grant-in-Aid for Comprehensive Research on Dementia from the Japanese Ministry of Health, Labour and Welfare, as well as by the grants from J-ADNI Pharmaceutical Industry Scientific Advisory Board (ISAB) companies. The authors would also like to thank the J-ADNI Imaging ISAB and other organizations for their support of this work.
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Ikari, Y., Nishio, T., Makishi, Y. et al. Head motion evaluation and correction for PET scans with 18F-FDG in the Japanese Alzheimer’s disease neuroimaging initiative (J-ADNI) multi-center study. Ann Nucl Med 26, 535–544 (2012). https://doi.org/10.1007/s12149-012-0605-4
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DOI: https://doi.org/10.1007/s12149-012-0605-4