Patent ID: 9025723
Filing Date: 2015-05-05
Classification: A61B

Abstract:
1. A method for performing at least two pre-scans while rotating a rotating gantry ( 104 ) of an imaging system about an examination region during a same scan, comprising: determining a start and an end pre-scan positions of a subject support carrying a subject to be imaged; acquiring data, via the imaging system while rotating the rotating gantry, only during a predetermined angular range about a first angle of rotation for a first plurality of rotations from the start to the end pre-scan positions and during the predetermined angular range about a second angle of rotation for a second plurality of rotations from the start to the end pre-scan positions, wherein the first angle of rotation corresponds to a first material free region in an annular of radiation attenuating material at least one of temporarily and stationarily affixed to a rotating gantry and the second angle of rotation corresponds to a second material free region in the annular ring of radiation attenuating material, wherein a radiation source emits radiation as it rotates about the examination region, and the emitted radiation only traverse the examination region when a path of the radiation from a radiation source aligns with a material free region in the annular ring; and reconstructing a first pre-scan based only on the data acquired during the predetermined angular range about the first angle of rotation and a second pre-scan based only on the data acquired during the predetermined angular range about the second angle of rotation.