Apparatus for automatically positioning a patient for treatment/diagnoses
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Jul 31, 1996
filing date -
Jul 31, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A patient is automatically accurately positioned relative to a fixed refece of a treatment/diagnostic device by an optical system which operates a patient positioning assembly to bring fiducials or skin markers on the patient into coincidence with impingement points of laser beams projected in a fixed pattern relative to the device. Cameras record images of the fiducials and laser impingement points from which alignment error and velocity error in pixel space are determined. The velocity error in pixel space is converted to a velocity error in room space by the inverse of an Image Jacobian. The Image Jacobian is initially derived using rough values for system parameters and is continuously updated and refined using the calculated errors in pixel space derived from the camera images and errors in room space derived from position encoders on the treatment/diagnostic device.
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