Sampling effects for emerging cone-beam CT systems and scan trajectories: from Tuy’s condition to system design and routine image quality tests

A. Tersol; P. Wu; R. Clackdoyle; J. M. Boone; J. H. Siewerdsen

doi:10.1117/12.2613139

4 April 2022 Sampling effects for emerging cone-beam CT systems and scan trajectories: from Tuy’s condition to system design and routine image quality tests

A. Tersol, P. Wu, R. Clackdoyle, J. M. Boone, J. H. Siewerdsen

Author Affiliations +

Proceedings Volume 12031, Medical Imaging 2022: Physics of Medical Imaging; 120313D (2022) https://doi.org/10.1117/12.2613139
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

Abstract

Principles of cone-beam sampling are considered in terms of an analytical figure of merit for data incompleteness [tan(ψ_𝑚𝑖𝑛)] and experimental measurements of cone-beam artifact magnitude in an image quality phantom. The phantom incorporates disk-pairs oriented parallel to the axial plane (perpendicular to the z-axis) at various locations throughout the field of view. Experiments were conducted in which the phantom was imaged using a mobile C-arm with various, tilted and untilted source-detector trajectories (orbits). In the current work, scan orbits were limited to circular orbits – viz., a semicircular arc spanning ~196°. The magnitude of cone-beam artifacts was assessed in terms of the signal modulation (z_mod) in the narrow region between disk-pairs, and the relationship of z_mod and tan(ψ_𝑚𝑖𝑛) was evaluated for each orbit. The results show visually and quantitatively the effect of scan orbit and object orientation on cone-beam sampling effects and demonstrate the relationship between analytical tan(Ψ_𝑚𝑖𝑛) and empirical z_mod figures of merit. The analysis suggests a means by which cone-beam sampling effects (incompleteness) can be quantifiably considered in the development of new cone-beam CT system geometries, multi-source configurations, and protocols involving novel source-detector trajectories.

Citation Download Citation

A. Tersol, P. Wu, R. Clackdoyle, J. M. Boone, and J. H. Siewerdsen "Sampling effects for emerging cone-beam CT systems and scan trajectories: from Tuy’s condition to system design and routine image quality tests", Proc. SPIE 12031, Medical Imaging 2022: Physics of Medical Imaging, 120313D (4 April 2022); https://doi.org/10.1117/12.2613139

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Modulation

Image quality

3D image reconstruction

Computed tomography

Calibration

Imaging systems

X-ray sources

Show All Keywords

Keywords/Phrases

Search In:

Publication Years