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This study aims to develop a method for estimating the remaining useful life (RUL) of CT X-ray tubes without requiring a preset failure threshold or prior knowledge of tube\u00a0life.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_bmt-2026-0184_abs_003\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>To reduce the impact of varying scan conditions, different scan types are first analyzed, and the one with the most stable tube current distribution is selected. Then, a composite metric is applied to degradation parameters to obtain a candidate health indicator (HI). Next, the candidate HI is normalized using the training set and transformed into a percentage health indicator (PHI) to represent tube degradation. Finally, a state-based prognostics with similarity enhancement is applied to the PHI to estimate\u00a0RUL.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_bmt-2026-0184_abs_004\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The proposed method is evaluated using real tube log data under leave-one-out cross-validation. The results demonstrate that it achieves optimal prediction performance and enables cross-tube RUL estimation. Moreover, the prediction results can reflect the actual degradation progress of the tube without requiring a preset failure threshold.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_bmt-2026-0184_abs_005\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The proposed approach provides an effective and practical framework for CT X-ray tube RUL estimation, demonstrating good potential for practical medical equipment maintenance.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1515\/bmt-2026-0184","type":"journal-article","created":{"date-parts":[[2026,7,12]],"date-time":"2026-07-12T22:43:48Z","timestamp":1783896228000},"source":"Crossref","is-referenced-by-count":0,"title":["State-based prognostics with similarity enhancement for CT X-ray tubes using operational logs"],"prefix":"10.1515","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-1236-0660","authenticated-orcid":false,"given":"Changjun","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Clinical Engineering , The Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangjie","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Clinical Engineering , The Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linze","family":"Qian","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering and Instrument Science, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ling","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Mechanical and Electrical Engineering, China Jiliang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenting","family":"Ye","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering and Instrument Science, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fengjie","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Clinical Engineering , The Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Panpan","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Clinical Engineering , Zhejiang Provincial People\u2019s Hospital , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yonghua","family":"Chu","sequence":"additional","affiliation":[{"name":"Department of Clinical Engineering , The Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Quchao","family":"Zou","sequence":"additional","affiliation":[{"name":"Department of Clinical Engineering , The Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou , China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2026,7,13]]},"reference":[{"key":"2026071211561026396_j_bmt-2026-0184_ref_001","unstructured":"Guthleben, M. 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