Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions

Jones, A. Kyle; Ahmad, Moiz; Raza, Shaan M.; Chen, Stephen R.; Siewerdsen, Jeffrey H.

doi:10.1117/12.2654347

Medical Imaging 2023: Physics of Medical Imaging 2023

DOI: 10.1117/12.2654347

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Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions

A. Kyle Jones

Moiz Ahmad

Shaan M. Raza

et al.

Abstract: To compare the image quality characteristics of a cone-beam CT (CBCT) imaging system with noncircular scan protocols (Sine-on-Sphere) to a conventional circular orbit. A phantom was used to assess image uniformity, image noise, and noise-power spectrum (NPS) for a biplane C-arm (Icono; Siemens Healthineers) that could perform CBCT with either a circular or non-circular orbit (Sine-on-Sphere, “SineSpin”). The non-circular orbit used a sinusoidal motion with an amplitude of ±10º during the orbit. Uniformity and … Show more

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2024

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Fully automatic online geometric calibration for non‐circular cone‐beam CT orbits using fiducials with unknown placement

Ma,

Reynolds,

Ehtiati

et al. 2024

Medical Physics

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BackgroundCone‐beam CT (CBCT) with non‐circular scanning orbits can improve image quality for 3D intraoperative image guidance. However, geometric calibration of such scans can be challenging. Existing methods typically require a prior image, specialized phantoms, presumed repeatable orbits, or long computation time.PurposeWe propose a novel fully automatic online geometric calibration algorithm that does not require prior knowledge of fiducial configuration. The algorithm is fast, accurate, and can accommodate arbitrary scanning orbits and fiducial configurations.MethodsThe algorithm uses an automatic initialization process to eliminate human intervention in fiducial localization and an iterative refinement process to ensure robustness and accuracy. We provide a detailed explanation and implementation of the proposed algorithm. Physical experiments on a lab test bench and a clinical robotic C‐arm scanner were conducted to evaluate spatial resolution performance and robustness under realistic constraints.ResultsQualitative and quantitative results from the physical experiments demonstrate high accuracy, efficiency, and robustness of the proposed method. The spatial resolution performance matched that of our existing benchmark method, which used a 3D‐2D registration‐based geometric calibration algorithm.ConclusionsWe have demonstrated an automatic online geometric calibration method that delivers high spatial resolution and robustness performance. This methodology enables arbitrary scan trajectories and should facilitate translation of such acquisition methods in a clinical setting.

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Fully automatic online geometric calibration for non‐circular cone‐beam CT orbits using fiducials with unknown placement

Ma,

Reynolds,

Ehtiati

et al. 2024

Medical Physics

View full text Add to dashboard Cite

show abstract

Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions

Jones,

Ahmad,

Raza

et al. 2024

J. Med. Imag.

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We aim to compare the imaging performance of a cone-beam CT (CBCT) imaging system with noncircular scan protocols (sine-on-sphere) to a conventional circular orbit.Approach: A biplane C-arm system (ARTIS Icono; Siemens Healthineers) capable of circular and noncircular CBCT acquisition was used, with the latter orbit (sine-onsphere, "Sine Spin") executing a sinusoidal motion with AE10 deg tilt amplitude over the half-scan orbit. A test phantom was used for the characterization of image uniformity, noise, noise-power spectrum (NPS), spatial resolution [modulation transfer function (MTF) in axial and oblique directions], and cone-beam artifacts. Findings were interpreted using an anthropomorphic head phantom with respect to pertinent tasks in skull base neurosurgery. Results:The noncircular scan protocol exhibited several advantages associated with improved 3D sampling-evident in the NPS as filling of the null cone about the f z spatial frequency axis and reduction of cone-beam artifacts. The region of support at the longitudinal extrema was reduced from 16 to ∼12 cm at a radial distance of 6.5 cm. Circular and noncircular orbits exhibited nearly identical image uniformity and quantum noise, demonstrating cupping of −16.7% and overall noise of ∼27 HU. Although both the radially averaged axial MTF (f x;y ) and 45 deg oblique MTF (f x;y;z ) were ∼20% lower for the noncircular orbit compared with the circular orbit at the default full reconstruction field of view (FOV), there was no difference in spatial resolution for the medium reconstruction FOV (smaller voxel size). Differences in the perceptual image quality for the anthropomorphic phantom reinforced the objective, quantitative findings, including reduced beam-hardening and cone-beam artifacts about structures of interest in the skull base.Conclusions: Image quality differences between circular and noncircular CBCT orbits were quantitatively evaluated on a clinical system in the context of neurosurgery. The primary performance advantage for the noncircular orbit was the improved sampling and elimination of cone-beam artifacts.

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Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions

Cited by 2 publications

References 13 publications

Fully automatic online geometric calibration for non‐circular cone‐beam CT orbits using fiducials with unknown placement

Fully automatic online geometric calibration for non‐circular cone‐beam CT orbits using fiducials with unknown placement

Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions

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