X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2011-04-12
2011-04-12
Thomas, Courtney (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S095000
Reexamination Certificate
active
07924971
ABSTRACT:
For Respiration Correlated Cone Beam CT scanning, we have observed that improvements in the frame rate are in fact undesirable. We therefore propose a radiographic apparatus comprising a beam of radiation and a detector therefor, adapted to obtain a two dimensional image of the beam after passing through a cyclically varying object to be investigated, a processor adapted to review the images and select images at like points in the cycle, and a control means for the beam of radiation adapted to activate the beam periodically. The control means can activate the beam at a frequency of between 0.5 and 5 Hertz, more preferably between 1 and 3 Hertz, which corresponds (roughly) to a frequency that is between 6 and 10 times the frequency of the cyclical variation. It will assist if the selected point of the cycle is an extremity thereof, as the rate of change in these areas is at a minimum. Thus, slight mismatches between the two cycles will then have only a small effect. Typically, the object will be a patient and the cyclical variation will be the patient's breathing cycle.
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PCT International Search Report, Jul. 9, 2007.
Brown Kevin
Knox Christopher
Long Andrew
Elekta AB (Publ)
Thomas Courtney
Westman Champlin & Kelly
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