X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Reexamination Certificate
2006-05-02
2006-05-02
Church, Craig E. (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
C378S207000, C378S004000
Reexamination Certificate
active
07039163
ABSTRACT:
For automatically controlling or adjusting the X-ray dose when scanning an examination subject in a CT apparatus, a series of reference measurements are initially made by obtaining CT images of respective phantoms having different attenuation. The tube current for each phantom that produces an image of the phantom having an acceptable noise level, and thus an acceptable image quality, is stored in a table. In a subsequent CT scan of an examination subject, the tube voltage is automatically adjusted when irradiating a region of the subject having attenuation comparable to the attenuation of one of the phantoms, so as to employ the tube current when irradiating the examination subject that produced the image of acceptable quality for the comparable phantom.
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patent: 4709382 (1987-11-01), Sones
patent: 6901129 (2005-05-01), Tachizaki et al.
patent: 2002/0075997 (2002-06-01), Unger et al.
“Noise Due to Photon Counting Statistics in Computed X-Ray Tomography,” Chesler et al, J. of Computer Assisted Tomography (Computed Tomography), vol. 1, No. 1 (1977) pp. 64-74.
Hentschel Dietmar
Popescu Stefan
Süb Christoph
Wolf Heiko
Church Craig E.
Schiff & Hardin LLP
Siemens Aktiengesellschaft
Suchecki Krysytna
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