Fig. 1From: Localization of TSH-secreting pituitary adenoma using 11C-methionine image subtractionRegistration steps. Step 1: MR2 is registered to MR1 using rigid registration. Step 2: PET1 is registered to MR1 using rigid registration. Step 3: PET2 is registered to MR2 [Co-Reg]. Step 4: PET2 [Co-Reg] is registered to PET1 [Co-Reg] and resampled into a matrix of the same size and shapeBack to article page