Measurement of the spatial resolution of a clinical volumetric computed tomography scanner using a sphere phantom

Michael M. Thornton; Michael J. Flynn

doi:10.1117/12.654969

28 February 2006 Measurement of the spatial resolution of a clinical volumetric computed tomography scanner using a sphere phantom

Michael M. Thornton, Michael J. Flynn

Author Affiliations +

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61421Z (2006) https://doi.org/10.1117/12.654969
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

The rapid development of modern multi-slice computed tomography (MSCT) scanners has provided imaging systems with cone-beam geometry, sub-millimetre slice thickness, and gantry rotation speeds approaching 0.3 seconds per revolution. Clinical MSCT scanners routinely generate volume data sets yet the methods used to quantify spatial resolution remain relatively unchanged from those used to evaluate single slice scanners. In this paper, we describe a method for quantifying the spatial resolution of an MSCT scanner, with cone-beam, geometry using a sphere phantom. By scanning a Teflon sphere embedded in a uniform silicone cylinder, the plane spread function (PlSF) and modulation transfer function (MTF) may be determined. Furthermore, the spatial resolution in the axial and trans-axial directions may be independently quantified, as well as the effects of Azimuthal blur and spiral scanning. To illustrate the utility of the sphere method, the spatial resolution of two commercially available MSCT scanners was measured.

Citation Download Citation

Michael M. Thornton and Michael J. Flynn "Measurement of the spatial resolution of a clinical volumetric computed tomography scanner using a sphere phantom", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421Z (28 February 2006); https://doi.org/10.1117/12.654969

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