X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2008-03-18
2008-03-18
Thomas, Courtney (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S901000, C382S131000
Reexamination Certificate
active
11571905
ABSTRACT:
The invention relates to a method of computed tomography wherein a radiation source moves relative to an examination zone along a helical trajectory and wherein the movement involves a rotation around a rotational axis and a shifting parallel to the rotational axis. During the movement, a detector unit acquires real measured values. Fictitious measured values are determined from the real measured values by solving John's equation for a virtual movement of the radiation source along an intersection ellipse. The intersection ellipse intersects the helical trajectory at an intersection point and is the intersection of a virtual cylindrical surface, on which the helical trajectory is situated, with an intersection plane that is defined by a tangent vector of the helical trajectory at the intersection point and a vector that is oriented perpendicular to the rotational axis. Finally, an image of the examination zone is reconstructed using the real and fictitious measured values.
REFERENCES:
patent: 6292526 (2001-09-01), Patch
patent: 2003/0174803 (2003-09-01), Katsevich
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Forthmann Peter
Kohler Thomas
Koninklijke Philips Electronics , N.V.
Taningco Alexander H
Thomas Courtney
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