Method and apparatus for determining the alignment of an object
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United States of America Patent
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Mar 15, 1994
Issued Date -
N/A
app pub date -
Dec 3, 1992
filing date -
Jan 9, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for quickly determining misalignment between two images. Patient misalignment calculations can performed on-line using Fourier correlation analysis to compare the location of a portal field of radiation with a previously stored portal reference field. Fourier comparisons are done in both hardware and software which rapidly computes misalignment of a patient relative to the portal field and can also rapidly reposition the patient with respect to that field.
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