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These methods have the potential to streamline clinical workflows and reduce the burden on patients by eliminating the need for additional procedures. While both techniques have shown good agreement with the gold standard for glucose metabolism assessment, F-fluorodeoxyglucose-PET, a direct comparison between them has yet to be fully clarified. This retrospective study aimed to compare perfusion-like data from pASL (rCBF) and ePET (SUVr) in a memory clinic cohort. We included 46 subjects (69\u2009\u00b1\u20098\u00a0years; 37 women) from the Geneva Memory Center (cognitively impaired-CI\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200929; cognitively unimpaired-CU\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200917), with available pASL and ePET. We evaluated the association between rCBF and SUVr values across 18 cortical and subcortical regions using linear regression and the within-subject coefficient of variation (wsCV). Regional differences between CU and CI groups were assessed using linear regression model corrected for age. We observed significant association between rCBF and SUVr in precuneus (\n                      <jats:italic>\u03b2<\/jats:italic>\n                      \u2009=\u20090.69, wsCV\u2009=\u200916.9), angular gyrus (\n                      <jats:italic>\u03b2<\/jats:italic>\n                      \u2009=\u20090.64, wsCV\u2009=\u200919.4), and hippocampus (\n                      <jats:italic>\u03b2<\/jats:italic>\n                      \u2009=\u20090.23, wsCV\u2009=\u200916.1). Additionally, significant differences in rCBF between CU and CI were also observed in the posterior cingulate, precuneus, calcarine, hippocampus, and composite (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), while SUVr showed significant differences only in the hippocampus. Our findings indicate weak to moderate local correlations between the two techniques. However, both exhibited differing regional perfusion levels in CU and CI groups, with rCBF showing more regional differences between cognitive stages in comparison with SUVr.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Key messages<\/jats:title>\n                    <jats:p>\n                      <jats:list list-type=\"bullet\">\n                        <jats:list-item>\n                          <jats:p>rCBF is assessed through pASL MRI and SUVr through ePET, both serving as proxies of brain perfusion.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>Weak to moderate associations between rCBF and SUVr were found in a number of brain regions.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>rCBF and SUVr differences between cognitive stages were observed mostly in cortical and subcortical regions respectively.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>Both techniques were able to identify AD perfusion-like differences expected in cognitively impaired vs unimpaired.<\/jats:p>\n                        <\/jats:list-item>\n                      <\/jats:list>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00109-025-02545-w","type":"journal-article","created":{"date-parts":[[2025,5,20]],"date-time":"2025-05-20T09:15:56Z","timestamp":1747732556000},"page":"809-819","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Agreement between early-phase amyloid-PET and pulsed arterial spin labeling in a memory clinic cohort"],"prefix":"10.1007","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9208-4472","authenticated-orcid":false,"given":"F.","family":"Ribaldi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A. 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