Single-view geometric calibration for C-arm inverse geometry CT

Jordan M. Slagowski; David A. P. Dunkerley; Charles R. Hatt; Michael A. Speidel

doi:10.1117/1.JMI.4.1.013506

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Single-view geometric calibration for C-arm inverse geometry CT

Journal article

Open access

Peer reviewed

Single-view geometric calibration for C-arm inverse geometry CT

Jordan M. Slagowski, David A. P. Dunkerley, Charles R. Hatt and Michael A. Speidel

Journal of medical imaging (Bellingham, Wash.), Vol.4(1), pp.013506-013506

01/01/2017

DOI: 10.1117/1.JMI.4.1.013506

PMCID: PMC5358550

PMID: 28560241

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https://doi.org/10.1117/1.JMI.4.1.013506View

Published (Version of record) Open Access

Abstract

Accurate and artifact-free reconstruction of tomographic images requires precise knowledge of the imaging system geometry. A projection matrix-based calibration method to enable C-arm inverse geometry CT (IGCT) is proposed. The method is evaluated for scanning-beam digital x-ray (SBDX), a C-arm mounted inverse geometry fluoroscopic technology. A helical configuration of fiducials is imaged at each gantry angle in a rotational acquisition. For each gantry angle, digital tomosynthesis is performed at multiple planes and a composite image analogous to a cone-beam projection is generated from the plane stack. The geometry of the C-arm, source array, and detector array is determined at each angle by constructing a parameterized three-dimensional-to-two-dimensional projection matrix that minimizes the sum-of-squared deviations between measured and projected fiducial coordinates. Simulations were used to evaluate calibration performance with translations and rotations of the source and detector. The relative root-mean-square error in a reconstruction of a numerical thorax phantom was 0.4% using the calibration method versus 7.7% without calibration. In phantom studies, reconstruction of SBDX projections using the proposed method eliminated artifacts present in noncalibrated reconstructions. The proposed IGCT calibration method reduces image artifacts when uncertainties exist in system geometry.

C-arm calibration

computed tomography

inverse geometry

Paper

Physics of Medical Imaging

scanning-beam digital x-ray

Details

Title: Subtitle: Single-view geometric calibration for C-arm inverse geometry CT
Creators: Jordan M. Slagowski - University of Wisconsin–Madison
David A. P. Dunkerley - University of Wisconsin
Charles R. Hatt - University of Wisconsin–Madison
Michael A. Speidel - University of Wisconsin–Madison
Resource Type: Journal article
Publication Details: Journal of medical imaging (Bellingham, Wash.), Vol.4(1), pp.013506-013506
DOI: 10.1117/1.JMI.4.1.013506
PMID: 28560241
PMCID: PMC5358550
NLM abbreviation: J Med Imaging (Bellingham)
ISSN: 2329-4302
eISSN: 2329-4310
Publisher: Society of Photo-Optical Instrumentation Engineers
Grant note: National Institutes of Health R01 HL084022 / National Heart, Lung, and Blood Institute
Language: English
Date published: 01/01/2017
Academic Unit: Radiation Oncology
Record Identifier: 9984313089502771

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