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ID | Project | Category | View Status | Date Submitted | Last Update | ||||
0001918 | ITK | public | 2005-06-09 03:26 | 2010-11-07 00:31 | |||||
Reporter | kavec | ||||||||
Assigned To | Luis Ibanez | ||||||||
Priority | urgent | Severity | feature | Reproducibility | always | ||||
Status | closed | Resolution | fixed | ||||||
Platform | OS | OS Version | |||||||
Product Version | |||||||||
Target Version | Fixed in Version | ||||||||
Summary | 0001918: FFT filter does not provide phase images | ||||||||
Description | In Fourier domain filtering, the phase component after FFT is usually discarted. In the ITK (I)FFT filters only absolute images is produced. These images in MRI reflect spatial representation of proton densities, weighted by relaxation processes and pulse sequence setting. In the majority cases only absolute images are viewed by a radiologist. However, recent image postprocessing techniques utilize also the phase information. Among the others, correction of geometric artifacts in EPI images (B0 field mapping), parallel imaging reconstruction algorithms (GRAPPA, SENSE), correction of partial volume effect in arterial input function in perfusion MRI, susceptibility weighted imaging, velocity measurements, and so on, utilize phase images after FFT. Therefore, itkVnlFFTComplexConjugateToRealImageFilter should have an option to return: absolute, phase, real, imaginary images. It is also suggested to rename the filter name. The current name gives an impression that the output of the filter is a real component (of a complex pair) image, while it in fact returns the absolute value. | ||||||||
Tags | No tags attached. | ||||||||
Resolution Date | |||||||||
Sprint | |||||||||
Sprint Status | backlog | ||||||||
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Relationships |
Notes | |
(0009124) Luis Ibanez (manager) 2007-09-19 10:37 |
We will try to do it during WA10 |
(0010236) Simon Warfield (developer) 2008-01-23 12:15 |
There is a set of classes submitted to the Insight Journal that implement complex to complex fourier transforms, and another set of classes for converting between complex representations, and magnitude/phase and real/imaginary representations. These classes address the need to deal with complex data from `raw' magnetic resonance image acquisitions. http://www.insight-journal.org/InsightJournalManager/view_publication.php?back=search.php%3Ftexte%3Dwarfield&pubid=128 [^] http://hdl.handle.net/1926/326 [^] |
(0022957) Luis Ibanez (manager) 2010-11-07 00:30 |
These classes are now in the Review directory. itkDirectFourierReconstructionImageToImageFilter.h itkDirectFourierReconstructionImageToImageFilter.txx itkFFTComplexToComplexImageFilter.h itkFFTWComplexToComplexImageFilter.h |
(0022958) Luis Ibanez (manager) 2010-11-07 00:31 |
The new classes in the Code/Review directory provide this behavior. |
Notes |
Issue History | |||
Date Modified | Username | Field | Change |
2007-09-19 10:37 | Luis Ibanez | Note Added: 0009124 | |
2008-01-23 12:15 | Simon Warfield | Note Added: 0010236 | |
2010-11-07 00:30 | Luis Ibanez | Note Added: 0022957 | |
2010-11-07 00:31 | Luis Ibanez | Sprint Status | => backlog |
2010-11-07 00:31 | Luis Ibanez | Note Added: 0022958 | |
2010-11-07 00:31 | Luis Ibanez | Status | assigned => closed |
2010-11-07 00:31 | Luis Ibanez | Resolution | open => fixed |
Issue History |
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