Method for displaying field of brain of patient during brain surgery involves determining output image from analysis image values and displaying output image

NOVELTY - The display method involves evaluating the sequence of images by: associating a first analysis image value to pixels in the first sequence of images to which pixels of same locations of the field (11) are imaged, respectively; associating a second analysis image value to pixels in the second sequence of images to which pixels of the same locations of the field are imaged, respectively. An output image is determined from the first and the second analysis image values and displayed.