Motion artifacts assessment and correction using optical tracking in synchrotron radiation breast CT
Open Access
- 12 July 2021
- journal article
- research article
- Published by Wiley in Medical Physics
- Vol. 48 (9), 5343-5355
- https://doi.org/10.1002/mp.15084
Abstract
Purpose The SYRMA-3D collaboration is setting up a breast computed tomography (bCT) clinical program at the Elettra synchrotron radiation facility in Trieste, Italy. Unlike the few dedicated scanners available at hospitals, synchrotron radiation bCT requires the patient's rotation, which in turn implies a long scan duration (from tens of seconds to few minutes). At the same time, it allows the achievement of high spatial resolution. These features make synchrotron radiation bCT prone to motion artifacts. This article aims at assessing and compensating for motion artifacts through an optical tracking approach. Methods In this study, patients’ movements due to breathing have been first assessed on seven volunteers and then simulated during the CT scans of a breast phantom and a surgical specimen, by adding a periodic oscillatory motion (constant speed, 1 mm amplitude, 12 cycles/minute). CT scans were carried out at 28 keV with a mean glandular dose of 5 mGy. Motion artifacts were evaluated and a correction algorithm based on the optical tracking of fiducial marks was introduced. A quantitative analysis based on the structural similarity (SSIM) index and the normalized mean square error (nMSE) was performed on the reconstructed CT images. Results CT images reconstructed through the optical tracking procedure were found to be as good as the motionless reference image. Moreover, the analysis of SSIM and nMSE demonstrated that an uncorrected motion of the order of the system's point spread function (around 0.1 mm in the present case) can be tolerated. Conclusions Results suggest that a motion correction procedure based on an optical tracking system would be beneficial in synchrotron radiation bCT.Keywords
This publication has 55 references indexed in Scilit:
- Chromatic X-ray imaging with a fine pitch CdTe sensor coupled to a large area photon counting pixel ASICJournal of Instrumentation, 2013
- X-ray phase-contrast imaging: from pre-clinical applications towards clinicsPhysics in Medicine & Biology, 2012
- Phase tomography from x-ray coherent diffractive imaging projectionsOptics Express, 2011
- Contrast-enhanced Dedicated Breast CT: Initial Clinical ExperienceRadiology, 2010
- Dedicated Breast CT: Initial Clinical ExperienceRadiology, 2008
- Image Quality Assessment: From Error Visibility to Structural SimilarityIEEE Transactions on Image Processing, 2004
- Simultaneous phase and amplitude extraction from a single defocused image of a homogeneous objectJournal of Microscopy, 2002
- Rates and Correlates of Discomfort Associated with MammographyRadiology, 2000
- Phase-contrast imaging using polychromatic hard X-raysNature, 1996
- Towards automatic electron tomography II. Implementation of autofocus and low-dose proceduresUltramicroscopy, 1993