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Radiology, Vol 132, 201-203, Copyright © 1979 by Radiological Society of North America

ARTICLES

The inverse compensating filter

KE Ekstrand, CR Ferree, RL Dixon and M Raben

When a single-field technique is used in megavoltage x-ray therapy, a uniform entrance dose is often required. If there is a large variation in source-to-surface distance over the field, an inverse type of compensating filter is necessary to achieve entrance dose uniformity. The production and utilization of these filters is discussed.




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