Simulator mounted Moiré topography camera for constructing compensating filters

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Abstract
A technique was developed to rapidly and accurately produce individualized Ellis compensation filters from Moire topographic photographs. A novel Moire camera was designed to mount on a radiotherapy simulator. The camera does not interfere with normal use of the simulator but can be deployed as needed. Depth of missing tissue contours are produced by the camera over the treatment field, accurately registered to the patient''s simulated treatment position. An optical enlargement technique is used to transfer the depth of missing tissue contours in the photograph to a Pb sheet compensating filter.