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Volume 9, Number S2, 2004

Time trend of setup deviations during irradiation of patients with breast, prostate and gynecologic cancers

A. Dąbrowski, P. F. Kukołowicz, N. Paczkowski

Summary:

Purpose: Evaluation of the time trend of setup deviations for patients treated with external beams.
Materials and methods: Analysis of time trend of setup deviations was carried out for patients irradiated for breast, prostate and gynecological cancers. Portal control technique was used to detect patients setup displacement for 18 patients with breast cancer (inverse hockey technique was applied), for 11 patients with gynecological cancers (box technique) and for 10 patients with prostate cancer (3 fields, AP and 2 wedge lateral fields). For breast cancer patients portals were made
for photon field only. A total of 82, 129 and 112 portals were made or breast, gynecological and prostate patients respectively. For gynecological and prostate patients for 1 vertical and 1 lateral fields portals were taken. Simulator films were treated as reference ones. For each patient and each axis displacement as a function of time was investigated. The analysis of setup deviations as a function of time, the displacement were plotted against time along each of perpendicular axis. The linear fit
of the resulting curve represents the trend of setup deviation with time. The slope of each linear curve fit was tested for statistical significance at the 95% confidence limit utilizing the T-test.
Results: Displacements with significant time trends were not detected. For 1 breast patient setup reproducibility was significantly gradually deteriorated - in the last week of treatment displacement reached the value of 8.5 mm (for mediolateral
direction). For all other patients reaction level was nether exceeded.
Conclusions: Time trend of setup displacement were rarely observed among patients treated in our hospital. In only 1 of 20 cases the setup accuracy was significantly deteriorated during the whole treatment course.

Signature: Rep Pract Oncol Radiother, 2004; 9(S2) : 291-291

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Indexed in: EMBASE®, the Excerpta Medica database, the Elsevier BIOBASE (Current Awareness in Biological Sciences) and in the Index Copernicus.

http://www.sciencedirect.com/science/journal/15071367/19/2