X-ray micro-CT with a displaced detector array

Med Phys. 2002 Jul;29(7):1634-6. doi: 10.1118/1.1489043.

Abstract

Because the sizes of samples differ in x-ray micro-CT applications, it is desirable to have a mechanism to change the field of view of a micro-CT scanner. A well-known way to double the diameter of the field of view is to displace a detector array by 50%. In this paper, we propose to displace a detector array by an amount of greater than 0% but less than 50% for a continuously adjustable field of view, and formulate a weighting scheme for artifact-free reconstruction. Then, we perform numerical simulation with the Shepp-Logan phantom to demonstrate the feasibility in fan-beam and cone-beam geometry.

MeSH terms

  • Computer Simulation
  • Humans
  • Image Processing, Computer-Assisted / methods*
  • Models, Statistical
  • Phantoms, Imaging
  • Tomography, X-Ray Computed / instrumentation
  • Tomography, X-Ray Computed / methods*
  • X-Rays