Patent ID: 6198789
Filing Date: 2001-03-06
Classification: A61B,H05G

Abstract:
A method for adjusting radiation flux in a CT scanner, comprising:acquiring radiation attenuation data with respect to a body being imaged by the scanner from a CT scan, in a vicinity of a first axial position along the body;determining a modulation function, dependent on radial view angle, based on the data;relatively translating the body and the scanner to a second axial position along the body; performing a CT scan in a vicinity of the second axial position, while controlling the radiation flux impinging on the body using the modulation function;acquiring radiation attenuation data at the second position;modifying the modulation function based on the data acquired at the second position;relatively translating the body and the scanner to a third axial position alone the body; andcontrolling the radiation flux impinging on the body in the third axial position, using the modified modulation function.