Reduction of noise in medullary renograms from dynamic MR images

Movement correction of the kidney in dynamic MRI scans using FFT phase difference movement detection

“…Use of these ROIs is only justified when the kidney has a constant shape and position in each image. Such is the case for transplanted kidneys, and we were able to show that in that situation the medullary signal could reliably be retrieved (16, 17).…”

“…As was shown by de Priester et al (15), the pure medullary signal can be obtained from the mixed signal by weighted subtraction of the cortical signal. In addition, we described an algorithm (16) to automatically determine the correct weighting factor and tested it in a series of subjects. The signals were recorded from ROIs that were automatically copied after manual segmentation of one of the images early in the dynamic series.…”