Title: Methods and apparatus for modulating x-ray tube current
Application Number: 200410005068 Application Date: 1997.09.05
Publication Number: 1522669 Publication Date: 2004.08.25
Approval Pub. Date: 2006.12.13 Granted Pub. Date: 2006.12.13
International Classifi-cation: A61B6/03,H05G1/26
Applicant(s) Name: Gen Eelctric Company Address:
Inventor(s) Name:
Attorney & Agent: wu limeng liang yong
Abstract:
     The present invention, in one form, is a system for modulating X-ray tube current as a function of gantry angle and slice location in a computed tomography system. In one embodiment, a desired noise level for a final image is selected, and a desired minimum X-ray photon reading and a desired average X-ray photon reading are identified to produce an image in accordance with the desired noise level. During scanning, actual X-ray photon readings are used with the desired average X-ray photon reading and the desired minimum X-ray photon reading to generate an X-ray modulating factor. This modulating factor is then used to modulate the X-ray tube current.
Time: 8
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