>> On 9/27/12 7:13 AM, "Bradley Lowekamp" >> <[email protected] <mailto:[email protected]>> >> wrote: >> However, I am >> >uncertain that this actually make sense, as the >> FFTForward filter does >> >converts from the spacial domain to the frequency this >> physical >> >information may not be very logical. >> >
It would be really nice if the transformed image had frequency units, or log2 frequency units. I for one do not know enough to calculate the precise meaning of a position on the transformed image. I do know that artifacts that show up in repeating patterns will show up as a blob on the transformed image, and I can high or low pass filter an image with a circular mask, after applying itkFFTShiftImageFilter. What I cannot do is use the current units on the transformed image to confirm that the blob I mask corresponds to the artifact that repeats every 10mm. I also cannot compare two FFTs of repeating structures, I'm thinking sarcomeres, and say anything quantitative about what's different.
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