| 主权项 |
1. A CT system, comprising:
an X-ray source, wherein the X-ray source is disposed on a first side of an imaging volume; an imaging detector configured to generate a first set of electrical signals in response to a first portion of X-rays emitted by the X-ray source, wherein the imaging detector is disposed on a second side of the imaging volume opposite the first side; a reference detector positioned on the first side of the imaging volume, wherein the reference detector is configured to generate a second set of electrical signals in response to a second portion of the X-rays emitted by the X-ray source, the reference detector comprising:
an X-ray assembly having three or more openings configured to transmit X-rays emitted from a focal spot, wherein at least two of the three or more openings are configured to transmit X-rays emitted at different localized sub-regions of the focal spot, and wherein a ratio of height to diameter of each of the at least two of the three or more openings is about 20 or greater; a data acquisition system configured to receive the first set of electrical signals from the imaging detector and the second set of electrical signals from the reference detector; and a processing component configured to process the second set of electrical signals to generate one or both of a size or a shape of a focal spot associated with X-ray emission by the X-ray source. |
