{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,9]],"date-time":"2024-09-09T19:58:01Z","timestamp":1725911881721},"reference-count":18,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2021,8,19]],"date-time":"2021-08-19T00:00:00Z","timestamp":1629331200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2021,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Demonstrate a novel phantom design using a remote camera imaging method capable of concurrently measuring the position of the x\u2010ray isocenter and the magnetic resonance imaging (MRI) isocenter on an MR\u2010linac.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A conical frustum with distinct geometric features was machined out of plastic. The phantom was submerged in a small water tank, and aligned using room lasers on a MRIdian MR\u2010linac (ViewRay Inc., Cleveland, OH). The phantom physical isocenter was visualized in the MR images and related to the DICOM coordinate isocenter. To view the x\u2010ray isocenter, an intensified CMOS camera system (DoseOptics LLC., Hanover, NH) was placed at the foot of the treatment couch, and centered such that the optical axis of the camera was coincident with the central axis of the treatment bore. Two or four 8.3mm x 24.1cm beams irradiated the phantom from cardinal directions, producing an optical ring on the conical surface of the phantom. The diameter of the ring, measured at the peak intensity, was compared to the known diameter at the position of irradiation to determine the Z\u2010direction offset of the beam. A star\u2010shot method was employed on the front face of the frustum to determine X\u2010Y alignment of the MV beam. Known shifts were applied to the phantom to establish the sensitivity of the method.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Couch translations, demonstrative of possible isocenter misalignments, on the order of 1mm were detectable for both the radiotherapy and MRI isocenters. Data acquired on the MR\u2010linac demonstrated an average error of 0.28mm(N=10, R<jats:sup>2<\/jats:sup>=0.997, \u03c3=0.37mm) in established Z displacement, and 0.10mm(N=5, \u03c3=0.34mm) in XY directions of the radiotherapy isocenter.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The phantom was capable of measuring both the MRI and radiotherapy treatment isocenters. This method has the potential to be of use in MR\u2010linac commissioning, and could be streamlined to be valuable in daily constancy checks of isocenter coincidence.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acm2.13377","type":"journal-article","created":{"date-parts":[[2021,8,19]],"date-time":"2021-08-19T08:55:23Z","timestamp":1629363323000},"page":"252-261","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Optical emission\u2010based phantom to verify coincidence of radiotherapy and imaging isocenters on an MR\u2010linac"],"prefix":"10.1002","volume":"22","author":[{"given":"Jacqueline M.","family":"Andreozzi","sequence":"first","affiliation":[{"name":"Thayer School of Engineering Dartmouth College Hanover New Hampshire USA"},{"name":"Department of Radiation Oncology Moffitt Cancer Center Tampa Florida USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Petr","family":"Br\u016f\u017ea","sequence":"additional","affiliation":[{"name":"Thayer School of Engineering Dartmouth College Hanover New Hampshire USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jochen","family":"Cammin","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Washington University School of Medicine St. Louis Missouri USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel A.","family":"Alexander","sequence":"additional","affiliation":[{"name":"Thayer School of Engineering Dartmouth College Hanover New Hampshire USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian W.","family":"Pogue","sequence":"additional","affiliation":[{"name":"Thayer School of Engineering and Department of Physics and Astronomy Dartmouth College Hanover New Hampshire USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Olga","family":"Green","sequence":"additional","affiliation":[{"name":"Department of Radiation Oncology Washington University School of Medicine St. Louis Missouri USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David J.","family":"Gladstone","sequence":"additional","affiliation":[{"name":"Norris Cotton Cancer Center Dartmouth\u2010Hitchcock Medical Center Lebanon New Hampshire USA"},{"name":"Geisel School of Medicine Thayer School of Engineering Dartmouth College Hanover New Hampshire USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,8,19]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0360-3016(88)90446-4"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1120\/jacmp.v12i4.3645"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.3190392"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijrobp.2014.01.046"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1117\/1.JMI.5.1.015001"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1088\/0031-9155\/60\/1\/L1"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.4821543"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1117\/1.JBO.24.7.071609"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijrobp.2018.10.030"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1088\/0031-9155\/59\/14\/3789"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.12919"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMI.2017.2717800"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.13303"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.4939880"},{"key":"e_1_2_9_16_1","volume-title":"Improving treatment geometries in total skin electron therapy: Experimental investigation of linac angles and floor scatter dose contributions using Cherenkov imaging","author":"Andreozzi JM","year":"2018"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.4906249"},{"key":"e_1_2_9_18_1","volume-title":"Optical imaging method to quantify spatial dose variation due to the electron return effect in an MR\u2010linac","author":"Andreozzi JM","year":"2019"},{"key":"e_1_2_9_19_1","first-page":"632","article-title":"\u201c3D Slicer\u201d, 2004 2nd IEEE Int","volume":"1","author":"Pieper S","year":"2004","journal-title":"Symp. Biomed. Imaging Macro to Nano"}],"container-title":["Journal of Applied Clinical Medical Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/acm2.13377","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/acm2.13377","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/acm2.13377","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,8,28]],"date-time":"2023-08-28T06:37:00Z","timestamp":1693204620000},"score":1,"resource":{"primary":{"URL":"https:\/\/aapm.onlinelibrary.wiley.com\/doi\/10.1002\/acm2.13377"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,8,19]]},"references-count":18,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2021,9]]}},"alternative-id":["10.1002\/acm2.13377"],"URL":"https:\/\/doi.org\/10.1002\/acm2.13377","archive":["Portico"],"relation":{},"ISSN":["1526-9914","1526-9914"],"issn-type":[{"value":"1526-9914","type":"print"},{"value":"1526-9914","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,8,19]]},"assertion":[{"value":"2020-12-07","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2021-07-09","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2021-08-19","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}