Radiotherapy apparatus and parts thereof

Details Radiotherapy apparatus and parts thereof Radiotherapy apparatus and parts thereof

2007-10-26

2009-08-04

Glick, Edward J (Department: 2882)

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

C378S065000, C378S117000

Reexamination Certificate

active

07570740

ABSTRACT:
The detected positioning error in a geometry item of a radiotherapy apparatus is generally passed to a transfer function for the system, which outputs a signal that dictates the radiation output. If the detected error is within certain limits then the radiation is permitted whereas outside those limits it is not permitted; this corresponds to a transfer function that is a simple two step function. We propose a transfer function having a result that is (a) substantially zero outside a preset error tolerance, (b) has a maximum result at a point within that tolerance, and (c) has a result that is between zero and that maximum over a range of error values that lie between (i) the error value corresponding to the maximum output and (ii) the preset error tolerance. This means that if an error grows towards (but does not exceed) the error tolerance, the output of the radiation source will reduce and allow time for the geometry item to correct its position.

REFERENCES:
patent: 4047043 (1977-09-01), Meyer
patent: 5635714 (1997-06-01), Nablo et al.
patent: 6240162 (2001-05-01), Hernandez-Guerra et al.
patent: 7286641 (2007-10-01), Brendler et al.
patent: 7307264 (2007-12-01), Brusasco et al.
patent: 2006/0088655 (2006-04-01), Collins et al.
patent: 2008/0144772 (2008-06-01), Yi et al.

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