2026-06-16T14:04:52Zhttps://repisalud.isciii.es/rest/oai/request
oai:repisalud.isciii.es:20.500.12105/65332024-09-27T10:09:50Zcom_20.500.12105_19604com_20.500.12105_2051col_20.500.12105_19607
Repisalud author Abella, Monica author de Molina, Claudia author Ballesteros, Nerea author Garcia-Santos, Alba author Martinez, Alvaro author Garcia, Ines author Desco, Manuel funder Ministerio de Economía y Competitividad (España) funder Ministerio de Economía, Industria y Competitividad (España) funder Unión Europea. Fondo Europeo de Desarrollo Regional (FEDER/ERDF) funder Fundación ProCNIC 2018-10-26T07:59:25Z 2018-10-26T07:59:25Z 2018 PLoS One. 2018; 13(9):e0203817 10.1371/journal.pone.0203817 1932-6203 PLOS ONE 30212543 http://hdl.handle.net/20.500.12105/6533 In scenarios where the use of a Computed Tomography (CT) is difficult, such as during surgery or in the ICU, the use of a C-arm system to generate tomographic information could contribute with interesting additional clinical information. Recent days are seeing the development of the so-called cone-beam CT (CBCT) based on advanced motorized isocentric C-arm systems. To be able to make use of more basic C-arm systems, apart from the geometric non-idealities common to any CBCT, we need to address other difficulties. First, the trajectory of the source-detector pair may differ from a circular path and the system may suffer mechanical strains that modify the relative positions of the source and detector for different projection angles. Second, and more importantly, the exact position of the source and detector elements may not be repeatable for consecutive rotations due to low mechanical precision, thus preventing an accurate geometrical calibration of the system. Finally, the limitation of the angular span and the difficulty of obtaining a high number of projections pose a great challenge to the image reconstruction. In this work, we present a novel method to adapt a standard C-arm, originally designed for planar imaging, to be used as a tomograph. The key parts of the new acquisition protocol are (1) a geometrical calibration method to compensate mechanical inaccuracies that prevent an accurate repetition of source-detector position between acquisitions, and (2) an advanced image reconstruction method able to deal with limited angle data, sparse projections and non-circular trajectories. Both methods exploit surface information from the patient, which can be obtained using a 3D surface scanner. The proposed method was evaluated with two real C-arm systems, based on an image intensifier and a flat panel detector respectively, showing the feasibility of the proposal. eng BEAM COMPUTED-TOMOGRAPHY IMAGE GUIDANCE RECONSTRUCTION SURGERY IDENTIFICATION CALIBRATION EXPERIENCE ALGORITHM Enabling tomography with low-cost C-arm systems journal article URL https://repisalud.isciii.es/bitstreams/54c1aef8-1fb7-4bdc-82fa-6d05415977ba/download File MD5 dca19e08a0de8c849a223964e39a3821 7106644 application/pdf EnablingTomographyWithLow-cost_2018.pdf URL https://repisalud.isciii.es/bitstreams/d4b37e82-5e8d-4f50-8b78-ffb6970078b4/download File MD5 8b42c8396999ce727f0fa00fb41a7457 43828 text/plain EnablingTomographyWithLow-cost_2018.pdf.txt