X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Reexamination Certificate
2011-01-18
2011-01-18
Glick, Edward J (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
C378S098110, C378S207000, C250S252100, C250S369000, C250S370090, C250S370110
Reexamination Certificate
active
07873144
ABSTRACT:
A radiographic imaging apparatus (10) comprises a primary radiation source (14) which projects a beam of radiation into an examination region (16). A detector (18) converts detected radiation passing through the examination region (16) into electrical detector signals representative of the detected radiation. The detector (18) has at least one temporally changing characteristic such as an offset B(t) or gain A(t). A grid pulse means (64) turns the primary radiation source (14) ON and OFF at a rate between 1000 and 5000 pulses per second, such that at least the offset B(t) is re-measured between 1000 and 5000 times per second and corrected a plurality of times during generation of the detector signals. The gain A(t) is measured by pulsing a second pulsed source (86, 100, 138) of a constant intensity (XRef) with a second pulse means (88). The gain A(t) is re-measured and corrected a plurality of times per second during generation of the detector signals.
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Chappo Marc A.
Harwood Brian E.
Luhta Randall P.
Mattson Rodney A.
Vrettos Chris J.
Corbett John M
Glick Edward J
Koninklijke Philips Electronics , N.V.
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