Wavefront coding phase contrast imaging systems
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United States of America Patent
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Feb 25, 2003
Grant Date -
Dec 26, 2002
app pub date -
Jun 6, 2001
filing date -
Jun 6, 2001
priority date (Note) -
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Abstract
The present invention provides extended depth of field or focus to conventional Phase Contrast imaging systems. This is accomplished by including a Wavefront Coding mask in the system to apply phase variations to the wavefront transmitted by the Phase Object being imaged. The phase variations induced by the Wavefront Coding mask code the wavefront and cause the optical transfer function to remain essentially constant within some range away from the in-focus position. This provides a coded image at the detector. Post processing decodes this coded image, resulting in an in-focus image over an increased depth of field.
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