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  • Title: [Quality assurance in stereotactic space. Determination of the accuracy of aim and dose in single dose radiosurgery].
    Author: Mack A, Mack G, Weltz D, Hönes A, Jess A, Wowra B, Czempiel H, Heck B, Kreiner HJ, Seifert V, Böttcher H.
    Journal: Strahlenther Onkol; 2003 Nov; 179(11):760-6. PubMed ID: 14605746.
    Abstract:
    BACKGROUND: Single dose irradiation techniques require methods of quality assurance of high precision. The complete operational sequence of a treatment from imaging over irradiation planning up to the patient irradiation has to be controlled and verified in a phantom (Figure 2). These demands receive special topicality by the E-DIN 6875-1 [38], which will appear soon. MATERIAL AND METHODS: A quality assurance package was developed to meet the requirements of the E-DIN 6875-1 [38]. It consists of versatile usable precision phantom (Figure 1), a dose measuring system for the tissue equivalent radiochromic film GAFCHROMIC trade mark type MD 55 II using a high-quality scanner, and a software for standardized test routines (Figures 2 to 4). Correction routines for film fog, darkening, temperature effect as well as for film inhomogeneities (double exposure technology) are implemented. RESULTS: The measuring system permits routine dosimetry with inaccuracies typically < 5%, for the double exposure procedure typically < 3% with local dissolutions of approx. 1/100 mm in film plane, perpendicularly to it the film stack density and the film thickness (0.3 mm) are determining. The measuring system is designed to simulate the complete three-dimensional treatment of a patient (Figure 4). CONCLUSIONS: The procedure achieves a high quality standard for all steps in radiosurgery. The simple handling permits the employment for the daily routine (according to E-DIN 6875-1 [38]), in addition, for the modelling of complicated 3-d of scattering conditions, e. g. close to risk structures.
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