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[Evaluation of Cone Beam CT Image Quality and Analysis of Its Long-term Stability on HU Values under Different
Objective:
To evaluate the cone beam CT (CBCT) image quality and its long-term stability for HUs under different scanning conditions.
Methods:
With the OBI system, Catphan 504 phantom using the different modes was scanned through one year. Analysis of variance (ANOVA) was used to evaluate the CBCT images.
Results:
The results of contrast resolution under different scanning conditions met the requirements of acceptance test procedure. Spatial contrast resolution(≥5 lp/cm) of half-fan scanning conditions were inferior to those (≥7 lp/cm) of ful-fan mode. The accuracies of spatial linear distance and angle were within±1%. HUs in air density plug were constant, but HUs of other plugs with different conditions had the signifi cant difference (F=660.84,P=0). Under different conditions in a year, the mean HUs showed a good agreement.
Conclusions:
HUs of CBCT image under different scanning conditions exist a little difference, but there is a good consistency for the long term stability analysis. It is helpful for CBCT images directly used for dose re-calculation in adaptive radiation therapy (ART).
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