A phantom based laser marking workflow to visually assess geometric image distortion in magnetic resonance guided radiotherapy.
External laser bridge
Gradient nonlinearity
Lightweight plastic skeleton
MR distortion correction
Patient marking workflow
Silicone-based spherical fiducials
Journal
Physics and imaging in radiation oncology
ISSN: 2405-6316
Titre abrégé: Phys Imaging Radiat Oncol
Pays: Netherlands
ID NLM: 101704276
Informations de publication
Date de publication:
Jan 2021
Jan 2021
Historique:
received:
29
06
2020
revised:
27
01
2021
accepted:
28
01
2021
entrez:
26
4
2021
pubmed:
27
4
2021
medline:
27
4
2021
Statut:
epublish
Résumé
Magnetic resonance (MR)-only workflows require quality assurance due to potential dosimetric impacts of using geometry distorted MR images in radiotherapy planning. MR-visible silicone-based fiducials were arranged in regular 3D structures to cover extended imaging volumes. The scanner's patient marking workflow with a 2-axes movable laser bridge allowed to visually check geometric distortions of each MR reconstructed fiducial against its true position in 3D space. A measurement resolution and uncertainty of the order of 0.5 mm in sagittal and coronal, and 1 mm in transversal direction was found. The proposed workflow required 1 min of evaluation time per fiducial position, and a 9 min 3D MR volume acquisition.
Identifiants
pubmed: 33898786
doi: 10.1016/j.phro.2021.01.012
pii: S2405-6316(21)00010-5
pmc: PMC8058018
doi:
Types de publication
Journal Article
Langues
eng
Pagination
95-99Informations de copyright
© 2021 The Author(s).
Déclaration de conflit d'intérêts
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: All three authors are employed by Siemens Healthcare GmbH, Erlangen, Germany, a manufacturer of MR scanners.
Références
Magn Reson Imaging. 2004 May;22(4):529-42
pubmed: 15120173
IEEE Trans Med Imaging. 1992;11(3):319-29
pubmed: 18222873
Neuroimage. 2006 Apr 1;30(2):436-43
pubmed: 16300968
Phys Imaging Radiat Oncol. 2018 May 01;6:31-38
pubmed: 33458386
Phys Med Biol. 2000 Aug;45(8):2117-32
pubmed: 10958184
Phys Med Biol. 2017 Jan 21;62(2):N18-N31
pubmed: 28033119
Med Phys. 2015 Oct;42(10):5955-60
pubmed: 26429270
Magn Reson Med. 1984 Mar;1(1):44-65
pubmed: 6571436
Med Phys. 2014 Nov;41(11):112303
pubmed: 25370659
Magn Reson Med. 2004 Jul;52(1):115-22
pubmed: 15236374
Phys Imaging Radiat Oncol. 2020 Mar 13;13:21-27
pubmed: 33458303
Int J Radiat Oncol Biol Phys. 2019 Mar 15;103(4):994-1003
pubmed: 30496879
Med Phys. 1993 Mar-Apr;20(2 Pt 1):379-80
pubmed: 8497227
Med Phys. 2015 Jan;42(1):28-39
pubmed: 25563245