Fig. 14From: Real-time algorithm for Poissonian noise reduction in low-dose fluoroscopy: performance evaluationA frame of the aluminum step phantom fluoroscopic sequence. The manually selected regions of interest are shown in yellow: the ROI1 was chosen for the FWHM estimation and the ROIA and ROIB were chosen for CNR estimation. The two dark circles in the middle correspond to the two metallic screws and bolts that hold the aluminum sheets togetherBack to article page