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Optimizing dual energy cone beam CT protocols for preclinical imaging and radiation research. | LitMetric

AI Article Synopsis

  • The study explores the feasibility of quantitative dual-energy CT (DECT) imaging for small animal irradiators that include an integrated cone-beam CT (CBCT) system.
  • It identifies the best imaging protocols, emphasizing the use of 50 and 90 kVp energy combinations at a dose level of 60 cGy to achieve minimal errors in measuring effective atomic numbers (Z) and electron densities (ρ).
  • The research concludes that optimized imaging techniques are crucial for accurate results, and it uniquely demonstrates the potential of DECT imaging for small animal research in a way not previously documented.

Article Abstract

Objective: The aim of this work was to investigate whether quantitative dual-energy CT (DECT) imaging is feasible for small animal irradiators with an integrated cone-beam CT (CBCT) system.

Methods: The optimal imaging protocols were determined by analyzing different energy combinations and dose levels. The influence of beam hardening effects and the performance of a beam hardening correction (BHC) were investigated. In addition, two systems from different manufacturers were compared in terms of errors in the extracted effective atomic numbers (Z) and relative electron densities (ρ) for phantom inserts with known elemental compositions and relative electron densities.

Results: The optimal energy combination was determined to be 50 and 90 kVp. For this combination, Z and ρ can be extracted with a mean error of 0.11 and 0.010, respectively, at a dose level of 60 cGy.

Conclusion: Quantitative DECT imaging is feasible for small animal irradiators with an integrated CBCT system. To obtain the best results, optimizing the imaging protocols is required. Well-separated X-ray spectra and a sufficient dose level should be used to minimize the error and noise for Z and ρ. When no BHC is applied in the image reconstruction, the size of the calibration phantom should match the size of the imaged object to limit the influence of beam hardening effects. No significant differences in Z and ρ errors are observed between the two systems from different manufacturers. Advances in knowledge: This is the first study that investigates quantitative DECT imaging for small animal irradiators with an integrated CBCT system.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5605023PMC
http://dx.doi.org/10.1259/bjr.20160480DOI Listing

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