Patent ID: 8285072

Claim:
A method for improving the brightness uniformity in an image, comprising the steps of: acquiring signals by using a radio frequency receiving coil, and normalizing the noises of the acquired signals so as to produce the image; determining the brightness of each pixel in the image according to the sensitivity of the radio frequency receiving coil by obtaining a sensitivity curve of the radio frequency receiving coil by taking a measurement in advance thereto, and using said sensitivity curve as the image's brightness curve; and wherein compensating the brightness of each pixel of the image to make the brightness of the image uniform comprises compensating the brightness of each pixel of said image according to said brightness curve, so as to make the compensated brightness curve into an approximately horizontal straight line; and compensating the brightness of the each pixel of the image to make the brightness of the image uniform by determining a curve whose degree of fitting with said brightness curve reaches a predetermined threshold, and dividing the brightness of each pixel in the image by the value of the curve at the position corresponding to that of the pixel.