Patent ID: 6385278
Filing Date: 2002-05-07
Classification: A61B

Abstract:
A method for reducing radiation dosage during a region of interest scan (ROIS) of a multi-slice computed tomography (CT) imaging system having a radiation source generating a radiation beam and a multi-slice detector having a plurality of rows, the detector being configured to collect attenuation measurements of the radiation beam passing through an object to be imaged during a scan of the object, said method comprising the steps of:collimating the radiation beam into a fan-shaped radiation beam having at least a first region and a second region, the first region having a lesser angular extent than that of the second region; scanning an object having a region of interest (ROI) with the collimated radiation beam; and reconstructing an image of the object using the attenuation measurements collected during the scan, wherein said reconstruction utilizes attenuation measurements collected using the second region of the radiation beam to estimate projection data from portions of the object outside of the ROI blocked by said collimation.