Это преобразование описано в статье "Evaluation of Computed Tomography Scanners for Feasibility of Using Averaged Houndsfield Unit-to-Stopping Power Ratio Calibration Curve",
Heeteak Chung, et al - Int. Journal of Particle Therapy 2018 (https://theijpt.org/doi/full/10.14338/IJPT-17-0035.1)
Кривая преобразования приведена на рисунке ниже.
