Patent ID: 7780352

Claim:
An apparatus for detecting beam quality in a radiation system comprising: a first detector array disposed relative to a radiation source to intercept radiation energy from the radiation source that also intercepts a target object to thereby image the target object; a second detector array disposed relative to the radiation source to also intercept radiation energy from the radiation source while the first detector array images the target object such that radiation from the radiation source over a predetermined time period is substantially similar across the second detector array, the second detector array comprising radiation detectors operatively coupled to detector electronics; a radiation filter material disposed at least partially between the radiation source and the second detector array and such that the radiation filter material does not disrupt radiation from the radiation source from intercepting the target object while the first detector array images the target object, such that different portions of the second detector array are exposed to radiation from the radiation source through at least one of a group comprising different radiation filter material thicknesses and different radiation filter material compositions during the predetermined time period.