Augmented data from brain MRI
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The images are almost indistinguishable from normal, unremarkable T1 weighted MRI axial images from a brain.
The images were created from a single axial image in a T1 weighted MRI for the purposes of data for machine learning. They are examples of augmented data. In this specific case, the images were created via a computer algorithm written in Python which samples an original image and creates new augmented ones by simple matrix operations. Another type of augmented data, not shown, can be created by adding noise to the original data.
Although the images look indistinguishable from normal radiological images to the human eye, a well designed computer algorithms might be able to detect that they were made from re-sampling original image data and multiplying it by a specific matrices.