{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T15:08:54Z","timestamp":1783436934103,"version":"3.54.6"},"reference-count":62,"publisher":"IOP Publishing","issue":"7","license":[{"start":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T00:00:00Z","timestamp":1711411200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T00:00:00Z","timestamp":1711411200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/100007210","name":"Varian Medical Systems","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100007210","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Phys. Med. Biol."],"published-print":{"date-parts":[[2024,4,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    <jats:italic>Objective<\/jats:italic>\n                    . To combat the motion artifacts present in traditional 4D-CBCT reconstruction, an iterative technique known as the motion-compensated simultaneous algebraic reconstruction technique (MC-SART) was previously developed. MC-SART employs a 4D-CBCT reconstruction to obtain an initial model, which suffers from a lack of sufficient projections in each bin. The purpose of this study is to demonstrate the feasibility of introducing a motion model acquired during CT simulation to MC-SART, coined model-based CBCT (MB-CBCT).\n                    <jats:italic>Approach<\/jats:italic>\n                    . For each of 5 patients, we acquired 5DCTs during simulation and pre-treatment CBCTs with a simultaneous breathing surrogate. We cross-calibrated the 5DCT and CBCT breathing waveforms by matching the diaphragms and employed the 5DCT motion model parameters for MC-SART. We introduced the Amplitude Reassignment Motion Modeling technique, which measures the ability of the model to control diaphragm sharpness by reassigning projection amplitudes with varying resolution. We evaluated the sharpness of tumors and compared them between MB-CBCT and 4D-CBCT. We quantified sharpness by fitting an error function across anatomical boundaries. Furthermore, we compared our MB-CBCT approach to the traditional MC-SART approach. We evaluated MB-CBCT\u2019s robustness over time by reconstructing multiple fractions for each patient and measuring consistency in tumor centroid locations between 4D-CBCT and MB-CBCT.\n                    <jats:italic>Main results<\/jats:italic>\n                    . We found that the diaphragm sharpness rose consistently with increasing amplitude resolution for 4\/5 patients. We observed consistently high image quality across multiple fractions, and observed stable tumor centroids with an average 0.74 \u00b1 0.31 mm difference between the 4D-CBCT and MB-CBCT. Overall, vast improvements over 3D-CBCT and 4D-CBCT were demonstrated by our MB-CBCT technique in terms of both diaphragm sharpness and overall image quality.\n                    <jats:italic>Significance<\/jats:italic>\n                    . This work is an important extension of the MC-SART technique. We demonstrated the ability of\n                    <jats:italic>a priori<\/jats:italic>\n                    5DCT models to provide motion compensation for CBCT reconstruction. We showed improvements in image quality over both 4D-CBCT and the traditional MC-SART approach.\n                  <\/jats:p>","DOI":"10.1088\/1361-6560\/ad311b","type":"journal-article","created":{"date-parts":[[2024,3,7]],"date-time":"2024-03-07T17:23:10Z","timestamp":1709832190000},"page":"075022","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":6,"title":["Motion compensated cone-beam CT reconstruction using an\n                    <i>a priori<\/i>\n                    motion model from CT simulation: a pilot study"],"prefix":"10.1088","volume":"69","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1194-0148","authenticated-orcid":true,"given":"Michael","family":"Lauria","sequence":"first","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Miller","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kamal","family":"Singhrao","sequence":"additional","affiliation":[{"name":"Brigham and Women\u2019s Hospital, Dana Farber Cancer Institute and Harvard Medical School"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Lewis","sequence":"additional","affiliation":[{"name":"Cedars-Sinai Medical Center"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weicheng","family":"Lin","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dylan","family":"O\u2019Connell","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Louise","family":"Naumann","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bradley","family":"Stiehl","sequence":"additional","affiliation":[{"name":"Cedars-Sinai Medical Center"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anand","family":"Santhanam","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Boyle","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ann C","family":"Raldow","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan","family":"Goldin","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Igor","family":"Barjaktarevic","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel A","family":"Low","sequence":"additional","affiliation":[{"name":"UCLA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2024,3,26]]},"reference":[{"key":"pmbad311bbib1","doi-asserted-by":"publisher","first-page":"81","DOI":"10.1177\/016173468400600107","type":"journal-article","article-title":"Simultaneous algebraic reconstruction technique (SART): a superior implementation of the ART algorithm","volume":"6","author":"Andersen","year":"1984","journal-title":"Ultrasond Imaging"},{"key":"pmbad311bbib2","doi-asserted-by":"publisher","first-page":"62","DOI":"10.1002\/acm2.12825","type":"journal-article","article-title":"Independent review of 4DCT scans used for SABR treatment planning","volume":"21","author":"Antony","year":"2020","journal-title":"J. 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