{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T17:01:49Z","timestamp":1791478909884,"version":"4.3.4"},"reference-count":58,"publisher":"MIT Press","license":[{"start":{"date-parts":[[2024,10,28]],"date-time":"2024-10-28T00:00:00Z","timestamp":1730073600000},"content-version":"vor","delay-in-days":301,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["direct.mit.edu"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2024,11,13]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Tau positron emission tomography (PET) imaging in Alzheimer\u2019s Disease (AD) is becoming increasingly common to assess in vivo tau burden. MR images are often acquired to assist with processing of PET data, including for region-of-interest definitions in native space and for normalization to template space. However, in the real-world setting, corresponding MRIs may not be available and PET processing may require MRI-free pipelines. This is particularly important and challenging as the field moves towards early detection among clinically unimpaired (CU) individuals where changes in tau PET signal are expected to be subtle. We used two independent [18F]Flortaucipir tau PET datasets to evaluate whether MRI-free PET processing can detect subtle tau PET uptake differences in Amyloid+ (A+) CU individuals (preclinical AD) versus A-. Standardized Uptake Value Ratios (SUVRs) from MRI-free compared to MRI-based methods were evaluated using linear regression and linear mixed-effects regression models. Effect size differences between A+\/- CU groups in MRI-free processed cross-sectional and longitudinal tau PET SUVRs were compared to differences quantified through MRI-based processing. Regional MRI-free SUVRs were highly correlated with MRI-based SUVRs within CU individuals (average ICC = 0.90 for ADNI CU and 0.81 for A4 CU). MRI-free and MRI-based pipelines resulted in similar estimates of cross-sectional and longitudinal differences between A- and A+ CU, even in early focal regions within the medial temporal lobe.<\/jats:p>","DOI":"10.1162\/imag_a_00369","type":"journal-article","created":{"date-parts":[[2024,10,28]],"date-time":"2024-10-28T16:19:07Z","timestamp":1730132347000},"update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":6,"title":["MRI-free processing of tau PET images for early detection"],"prefix":"10.1162","volume":"2","author":[{"given":"Mackenzie L.","family":"Carlson","sequence":"first","affiliation":[{"name":"Departments of Neurology and Neurological Sciences, Stanford University, Stanford, CA, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viktorija","family":"Smith","sequence":"additional","affiliation":[{"name":"Departments of Neurology and Neurological Sciences, Stanford 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