Fig. 2
From: Efficient spectral data reduction for accurate iodine quantification in multi-energy CT
Graphical representation of the reduced dimension two-channel kVp-S estimator weighting scheme (left) and the four-channel estimator (right) used to compute the CRLB noise estimates. Both approaches use 100% of the available spectral channels, but the kVp-S scheme combines layer information before noise estimation.
