Development of a Beam Hardening Correction Method for a microCT Scanner Prototype

Journal Article · Tue Dec 07 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3531615· OSTI ID:21506982

Kikushima, J; Rodriguez-Villafuerte, M; Martinez-Davalos, A ^[1]

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1. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Circuito de la Investigacion Cientifica Ciudad Universitaria C. P. 04510, Mexico D.F. (Mexico)

The radiographic projections acquired with a microCT were simulated and then corrected for beam hardening effects using the linearized signal to equivalent thickness (LSET) method. This procedure requires a calibration signal for each pixel obtained from a set of images with filters of increasing thickness. The projections are corrected by converting the signal to an equivalent thickness using interpolation over the calibration images. The method was validated using simulated projections of different phantoms. Two calibration sets were simulated using aluminum and water filters of thicknesses ranging from 0 to 5 mm and from 0 to 50 mm, respectively. A simulation of the phantoms' projections using a monoenergetic beam was also obtained to establish the relative intensity on the tomographic images when no cupping artifacts are present. Comparison between corrected and uncorrected tomographic images shows that the LSET method effectively corrects the cupping artifact. Streaking artifacts correction with the LSET method shows better results than with the traditional water correction method. Results are independent of the two calibration materials used.

• OSTI ID: 21506982
• Journal Information: AIP Conference Proceedings, Vol. 1310, Issue 1; Conference: 11. Mexican symposium on medical physics, Mexico City (Mexico), 19-22 Mar 2010; Other Information: DOI: 10.1063/1.3531615; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
BEAMS
CALIBRATION
COMPARATIVE EVALUATIONS
COMPUTERIZED TOMOGRAPHY
CORRECTIONS
HARDENING
IMAGE PROCESSING
IMAGES
INTERPOLATION
MATERIALS
PHANTOMS
SIMULATION
THICKNESS
WATER
DIAGNOSTIC TECHNIQUES
DIMENSIONS
EVALUATION
HYDROGEN COMPOUNDS
MATHEMATICAL SOLUTIONS
MOCKUP
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PROCESSING
STRUCTURAL MODELS
TOMOGRAPHY