Dose control in CT-images

Details Dose control in CT-images Dose control in CT-images

2006-05-09

2006-05-09

Glick, Edward J. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S004000, C378S008000

Reexamination Certificate

active

07042977

ABSTRACT:
A method for determining a modulation function for modulating intensity of X-rays provided by an X-ray source of a CT-system for CT-imaging a slice of a region a person's body, the method comprising: acquiring X-ray attenuation data for a first substantially anterior-posterior or lateral view of the slice; determining a first maximum X-ray attenuation from the attenuation data; determining a length of a projection of the slice along an axis in the plane of the slice that is substantially orthogonal to the view angle using the attenuation data; determining a second maximum X-ray attenuation for a second view orthogonal to the first view based on the determined length; and using the first and second attenuation maxima to determine the modulation function.

REFERENCES:
patent: 5345381 (1994-09-01), Wallschlaeger
patent: 5400378 (1995-03-01), Toth
patent: 5822393 (1998-10-01), Popescu
patent: 6072851 (2000-06-01), Sivers
patent: WO 98/33361 (1998-07-01), None

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