Patent ID: 8559590

Claim:
A radiation method, comprising: imaging a body portion using a first X-ray source and a first X-ray detector to acquire a first image data set; identifying a reduced volume within the body portion containing a region of interest based on the first image data set; and imaging only the identified reduced volume containing the region of interest using a second X-ray source and a second X-ray detector to acquire a second image data set; wherein the first X-ray source and first X-ray detector and the second X-ray source and second X-ray detector are caused to rotate about a vertical axis in imaging the body portion and the reduced volume containing the region of interest wherein the first X-ray source has a first spot size, the first X-ray detector is a flat panel detector comprising a plurality of pixels each having a first pixel size, the second X-ray source has a second spot size, and the second X-ray detector is a flat panel detector comprising a plurality of pixels each having a second pixel size, wherein the second spot size of the second X-ray source is smaller than the first spot size of the first X-ray source and the second pixel size of each of the second pixels of the second X-ray detector is smaller than the first pixel size of each of the first pixels of the first X-ray detector.