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Filtering is any process that alters the relative frequency content. This can be done with an analog (conventional electrical) filter, e.g. to remove higher frequency components so as to avoid aliasing in digitizing. Filtering can be carried out numerically on the digitized data. Raw data can be filtered prior to the image calculation. The Hanning filter is provided with various weightings, e.g. for the reduction of edge oscillation.
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LCR Electronics Offers Quick Delivery on New EMI Filters That Eliminate RF Interference
Wednesday, 11 May 2011   by www.prnewswire.com    
Vascular Filters of Functional MRI: Spatial Localization Using BOLD and CBV Contrast
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Filtering
 
Filtering deletes components of the signal, high or low frequencies, band-pass, analog or digital. Whatever pattern or algorithms can be defined for data decimation.
Low pass filtering attenuates high frequency data and passes low frequency data. The reconstructed image will look a little blurrier, but nearly similar to the original image. The blurring is caused by the fact that the high spatial frequencies are lost, which contain information about edges in the image.
High pass filtering attenuates low frequencies and passes high frequencies. Most of the objects and contrast of the original image are lost in the reconstructed image, but the edges are clearly visible because high frequency data has been preserved.
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MR Image Reconstruction from Raw Data
   by dukemil.egr.duke.edu    
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The Scientist and Engineer's Guide to Digital Signal Processing
   by www.dspguide.com    
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Image Data Filter
 
Various reconstruction filters can be applied to MR images to reduce noise.
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Normalization Filter
 
This function equalizes the signal intensity when surface coils are used. By using this filter, the signal intensity of the region close to the coil is reduced, and the signal intensity of the area remote to the coil is increased. Also called homogeneity correction.
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Filtered Back Projection
 
Mathematical technique used in projection-reconstruction imaging to create images from a set of multiple projection profiles. The projection profiles are back projected to produce a two (or three) dimensional image. The projection profiles are processed by convolving them with a suitable mathematical function (filtered) prior to back projecting them, in order to improve the image. Widely used in conventional computed tomography (CT).
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Tomographic Image Reconstruction
   by www.aapm.org    
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