"Noise in an image can be quantified using the region of interest (ROI) tool placed in a region of uniform physical characteristics, like air or water. One common quantification of noise is the standard deviation in the pixel values (σ) within a region of interest with uniform physical properties. The larger the standard deviation, the worse the noise."
"Source"
"use a large field of view (FOV)"
Expected headings
"Quantifying noise"
"Image noise"
"Radiographic issues"
"Plain radiograph"
"CT"
"Source"
"MRI"
"Source of noise"
"Reducing MRI noise"
"Noise measurement"