Myocardial physiology measurements using contrast enhanced dynamic computed tomography: Simulation of beam hardening effect

Minsong Cao, Keith M. Stantz, Yun Liang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Initial animal study for quantifying myocardial physiology through contrast-enhanced dynamic x-ray CT suggested that beam hardening (BH) is one of the limiting factors for accurate regional physiology measurement. In this study, a series of simulations were performed to investigate BH deterioration effects and two correction algorithms were adapted to evaluate their efficiency in improving the measurements. The simulation tool consists of a module simulating data acquisition of a real polyenergetic scanner system and a heart phantom with simple geometric objects representing ventricles and myocardium. Each phantom component was modeled with time-varying attenuation coefficients determined by ideal iodine contrast dynamic curves obtained from experimental data or simulation. A compartment model was used to generate the ideal myocardium contrast curve using physiological parameters consistent with measured values. Projection data of the phantom were simulated and reconstructed to produce a sequence of simulated CT images. Simulated contrast dynamic curves were fitted to the compartmental model and the resultant physiological parameters were compared with ideal values to estimate the errors induced by BH artifacts. The simulations yielded similar deterioration patterns of contrast dynamic curves as observed in the initial study. Significant underestimation of left ventricle curves and corruption of regional myocardium curves result in systematic errors of regional perfusion up to approximately 24% and overestimates of fractional blood volume (f iv) up to 13%. The correction algorithms lead to significant improvement with perfusion errors reduced to 7% and errors of f iv within 2% which shows promise for more robust myocardial physiology measurement.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2006
Subtitle of host publicationPhysiology, Function, and Structure from Medical Images
DOIs
StatePublished - Jun 30 2006
EventMedical Imaging 2006: Physiology, Function, and Structure from Medical Images - San Diego, CA, United States
Duration: Feb 12 2006Feb 14 2006

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6143 II
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2006: Physiology, Function, and Structure from Medical Images
CountryUnited States
CitySan Diego, CA
Period2/12/062/14/06

Keywords

  • Beam hardening
  • Dynamic computed tomography
  • Myocardial physiology
  • Simulation
  • Systematic error

ASJC Scopus subject areas

  • Engineering(all)

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    Cao, M., Stantz, K. M., & Liang, Y. (2006). Myocardial physiology measurements using contrast enhanced dynamic computed tomography: Simulation of beam hardening effect. In Medical Imaging 2006: Physiology, Function, and Structure from Medical Images [61432N] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 6143 II). https://doi.org/10.1117/12.654206