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Clinical characteristics, FW-corrected and standard diffusion indices, and structural MRI indices were collected. Three supervised machine learning algorithms, including random forest (RF), support vector machine (SVM), and extreme gradient boosting (XGB), were adopted to construct a diagnostic model for distinguishing A\u03b2 deposition in AD. SHapley Additive exPlanation (SHAP) value was used as an interpretable algorithm to identify influential characteristics based on the best-performing model.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>In the single-modality model, FW-DTI achieved better classification performance than conventional DTI, which obtained accuracies all above 80% among three machine learning approaches on the internal dataset (RF\u2009=\u20090.800, SVM\u2009=\u20090.867, XGB\u2009=\u20090.800). In the multi-modality model, the XGB model integrated FW-DTI, voxel-based morphometry, and clinical features outperformed the RF and SVM models, achieving an accuracy of 86.7% and an area under the curves (AUC) value 93.2% in the training cohort, and an accuracy of 77.8% and AUC value of 83.1% in the external testing cohort. The model demonstrated high sensitivity but relatively low specificity, indicating a tendency toward positive predictions. Furthermore, FW-DTI indices were shown to have the highest predictive value for A\u03b2 deposition.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Integrating FW-DTI with structural and clinical features effectively differentiated A\u03b2 positivity in AD, with FW-DTI indices contributing the highest predictive risks, demonstrating the potential of FW-DTI in AD diagnosis.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12880-026-02380-6","type":"journal-article","created":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T11:35:55Z","timestamp":1777289755000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Amyloid-beta statuses prediction with free water MR imaging features in Alzheimer\u2019s disease using machine learning models"],"prefix":"10.1186","volume":"26","author":[{"given":"Rongshen","family":"Zhou","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuan","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shilong","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cui","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junda","family":"Qu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiyi","family":"Zeng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunlin","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihan","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiqing","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ting","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xian","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianjun","family":"Jia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Liang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,4,27]]},"reference":[{"key":"2380_CR1","doi-asserted-by":"crossref","unstructured":"2024 Alzheimer\u2019s disease facts and figures. 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