Limited-angle frequency-distance resolution recovery in nuclear medicine imaging
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United States of America Patent
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Jan 2, 2007
Grant Date -
Apr 15, 2004
app pub date -
Feb 13, 2001
filing date -
Feb 13, 2001
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Abstract
A nuclear camera (10) includes a plurality of detector heads (12) which have collimators (14) for fixing the trajectory along which radiation is receivable. A rotating gantry (22) rotates the detector heads around the subject collecting less than 360.degree. of data, e.g., 204.degree. of data. A zero-filling processor (50) generates zero-filled projection views such that the actually collected projection views and the zero-filled projection views span 360.degree.. A smoothing processor (56) smooths an interface between the zero-filled and actually collected projection views. The zero-filled and smoothed views are Fourier transformed (60) into frequency space, filtered with a stationary deconvolution function (62), and Fourier transformed (64) back into real space. The resolution recovered projection data sets in real space are reconstructed by a reconstruction processor (68) into a three-dimensional image representation for storage in an image memory (70).
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