{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T03:10:08Z","timestamp":1773285008483,"version":"3.50.1"},"reference-count":25,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2023,12,3]],"date-time":"2023-12-03T00:00:00Z","timestamp":1701561600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2024,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Robotic C\u2010arm cone\u2010beam computed tomography (CBCT) scanners provide fast in\u2010room imaging in radiotherapy. Their mobility extends beyond performing a gantry rotation, but they might encounter obstructions to their motion which limit the gantry angle range. The axial field\u2010of\u2010view (FOV) of a reconstructed CBCT image depends on the acquisition geometry. When imaging a large anatomical location, such as the thorax, abdomen, or pelvis, a centered cone beam might be insufficient to acquire untruncated projection images. Some CBCT scanners can laterally displace their detector and collimate the beam to increase the FOV, but the gantry must then perform a  rotation to provide complete data for\u00a0reconstruction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To extend the FOV of a CBCT image with a single short scan (gantry angle range of  fan angle) using two complementary short\u00a0scans.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We defined an acquisition protocol using two short scans during which the source follows the same trajectory and where the detector has equal and opposite tilt and\/or offset between the two scans, which we refer to as complementary scans. We created virtual acquisitions using a Monte Carlo simulator on a digital anthropomorphic phantom and on a computed tomography (CT) scan of a patient abdomen. For our proposed method, each simulation produced two complementary sets of projections, which were weighted for redundancies and used to reconstruct one CBCT image. We compared the resulting images to the ground truth phantoms and simulations of conventional\u00a0scans.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Reconstruction artifacts were slightly more prominent in the complementary scans w.r.t. a complete scan with untruncated projections but matched those in a single short scan without truncation. When analyzing reconstructed scans from simulated projections with scatter and corrected with prior CT information, we found a global agreement between complementary and conventional scan\u00a0approaches.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>When dealing with a limited range of motion of the gantry of a CBCT scanner, two complementary short scans are a technically valid alternative to a full 360 scan with equal FOV. This approach enables FOV extension without collisions or hardware\u00a0upgrades.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mp.16869","type":"journal-article","created":{"date-parts":[[2023,12,3]],"date-time":"2023-12-03T14:23:30Z","timestamp":1701613410000},"page":"3391-3404","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Extension of the cone\u2010beam CT field\u2010of\u2010view using two complementary short scans"],"prefix":"10.1002","volume":"51","author":[{"given":"Gabriele","family":"Belotti","sequence":"first","affiliation":[{"name":"Department of Electronics Information and Bioengineering CartCasLab, Politecnico di Milano (MI) Milan Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giovanni","family":"Fattori","sequence":"additional","affiliation":[{"name":"Center for Proton Therapy Paul Scherrer Institute Villigen Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guido","family":"Baroni","sequence":"additional","affiliation":[{"name":"Department of Electronics Information and Bioengineering CartCasLab, Politecnico di Milano (MI) Milan Italy"},{"name":"Centro Nazionale di Adroterapia Oncologica (CNAO) Pavia (PV) Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simon","family":"Rit","sequence":"additional","affiliation":[{"name":"Univ Lyon, CREATIS, INSA\u2010Lyon Universit\u00e9 Claude Bernard Lyon 1, UJM\u2010Saint Etienne, CNRS Inserm, CREATIS UMR5220, U1294 Lyon France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,12,3]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/mp.12744"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejmp.2014.10.075"},{"key":"e_1_2_9_4_1","unstructured":"DeutschmannHSA.MOBILE IMAGING RING SYSTEM Patent:20200121267 2020."},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/acm2.12225"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.1489043"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0895-6111(96)00031-6"},{"key":"e_1_2_9_8_1","doi-asserted-by":"crossref","unstructured":"PensselC KalenderWA KachelriessM.ROI\u2013Driven CT Trajectories. 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