Low-Noise Dynamic Reconstruction for X-Ray Tomographic Perfusion Studies Using Low Sampling Rates
Figure 2
Principle of low-pass filtering to obtain a low-noise sequence. The ideal low-pass filter adapted to the signal covers the frequency band (black dashed). The shaded area indicates the noise power density. Light shaded indicates masked out noise; whereas dark shaded indicates the noise in the frequency band of the signal. The light shaded spectra are repetitions of the spectrum of the signal due to sampling.
