Abstract
Quality assurance procedures have been defined and implemented for the treatment planning systems at Weston Park Hospital. The programme of tests and checks covers both hardware and software: hardware checks are concerned with the input and output performance of the system's peripheral devices; the software checks involve testing system data integrity, and testing the algorithms used for planning external photon and electron beams. Beam measurements from an ionization chamber scanned in water and air were compared with calculations from two independent treatment planning systems. Following the implementation of these quality assurance procedures, some improvements have been made to the system data used and changes have been introduced to planning practice.
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