42. Results of daily control of patients setup treated on holycross cancer centre in Kielce between 1 April 2000 and 31 March 2001

Abstract

Purpose

Presentation of quality control system being in force in Kielce and results of patients’ setup reproducibility and repeatability.

System description

Almost all patients treated in our hospital begin theirs treatments on Monday. For every patient treated with radical intent portal films are taken and compared with reference images obtained at simulator during the first fraction. After digitizing of both portal and reference films the comparison is performed by means of PIPS-PRO software. Comparison has to be completed until Wednesday morning when results are presented to radiotherapists on check meeting. Action levels specific to individual localization are defined and if difference between portal and reference film exceeds the specific level, another portal film is taken on the next day. If the difference still exceeds the action level the patient is directed again to simulator and the procedure starts from the very beginning. Until 31.01.2001 more than 442 pairs of films for 226 patients were analyzed.

Results

For 35 patients action level was exceeded (gynecologic 13, prostate 2, rectum 6, breast 7, brain 5 and lung 2). For 10 patients the second portal film was significantly different from reference film and simulation was repeated. Only in 5 cases systematic errors were found (gynecologic 2, rectum 2 and brain 1). PIPS-PRO software is proven to be a very useful tool for portal control.