As it is known, the potential tube voltage of the CT scanner is equivalent to the maximum energy of the produced photons, but it is not equivalent to the effective energy of the photons beam. Theoretically, effective energy = 1/2 to 1/3 of the maximum energy (or kVp). Furthermore, it varies from one CT modality to another and differs when exposure parameters are changed.
So, how could the effective energy be determined practically and precisely?
Thanks
See our 1989 paper CT spinal bone mineral measurement - a method based on effective photon energy on ResearchGate.
Thanks, William David Evans, for sharing your worthwhile paper, I appreciate that.
A few options - you can measure it or simulate it:
Article Technical Note: Spektr 3.0 - A computational tool for x-ray ...
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