METHOD AND APPARATUS FOR CONTROLLING FLUENCE IN COMPUTED X-RAY IMAGING

摘要

The present invention pertains to a system and method for X-ray imaging wherein a targeted fluence at the detector for projection images can be achieved at a plurality of projection angles around the imaging subject by control of exposure times implemented during image acquisition. Exposure time for a second projection image may be determined by the fluence in a first projection image, and in a third projection image by the fluence in a second projection image, where projection images are acquired within two degrees of one another. An acquisition parameter calculation can be configured to calculate acquisition parameters, such as said exposure times, to achieve the targeted fluence in projection images and can be coupled to a rotation controller that implements the acquisition parameters by controlling a relative angle between the imaging subject and X-ray image acquisition device.

主权项

1. A method of acquiring an X-ray image of an object comprising:
positioning said object in field of view of an X-ray image acquisition device; selecting a set of a plurality of unique projection angles between said X-ray image acquisition device and an axis through said object, wherein said set spans at least 45 degrees around said object; selecting a targeted X-ray fluence at a detector region for each of said projection angles; determining a targeted total exposure time for each of said projection angles corresponding to said targeted X-ray fluence; implementing said plurality of targeted total exposure times in said X-ray image acquisition device over said set of projection angles to acquire an image data set; and reconstructing an X-ray image from said image data set.