X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2011-08-09
2011-08-09
Midkiff, Anastasia (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S110000
Reexamination Certificate
active
07995703
ABSTRACT:
A method for controlling automatic X-ray exposure in an X-ray CT system includes establishing a correspondence table or function relationship between a ratio factor and an offset of a geometrical center of a scanned section, wherein the ratio factor represents a ratio of the projection area value when the geometrical center of the scanned section of a subject deviates from a rotation center to the standard projection area value when the geometrical center of the scanned section of the subject locates at the rotation center, scout scanning the subject, and calculating a “measured projection area value” and Projection Measure based on the scout scan data, calculating the offset of the geometrical center of the scanned section from the rotation center, substituting the offset into the correspondence table or function relationship to obtain a corresponding ratio factor, calculating the standard projection area value based on the ratio factor and the measured projection area value, and automatically determining by an automatic exposure function a tube current value required for exposure based on the calculated standard projection area value, the Projection Measure.
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Armstrong Teasdale LLP
GE Medical Systems Global Technology Company LLC
Midkiff Anastasia
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