Reproducibility and geometric accuracy of the Fixster system during hypofractionated stereotactic radiotherapy

BACKGROUND:Hypofractionated radiotherapy has been used for the treatment of AVMs and brain metastases. Hypofractionation necessitates the use of a relocatable stereotactic frame that has to be applied on several occasions. The stereotactic frame needs to have a high degree of reproducibility, and patient positioning is crucial to achieve a high accuracy of the treatment.METHODS:In this study we have, by radiological means, evaluated the reproducibility of the isocenter in consecutive treatment sessions using the Fixster frame. Deviations in the X, Y and Z-axis were measured in 10 patients treated with hypofractionated radiotherapy.RESULTS:The mean deviation in the X-axis was 0.4 mm (range -2.1 - 2.1, median 0.7 mm) and in the Y-axis -0.3 mm (range -1.4 - 0.7, median -0.2 mm). The mean deviation in the Z-axis was -0.6 (range -1.4 - 1.4, median 0.0 mm).CONCLUSION:There is a high degree of reproducibility of the isocenter during successive treatment sessions with HCSRT using the Fixster frame for stereotactic targeting. The high reducibility enables a safe treatment using hypofractionated stereotactic radiotherapy.

Bergström, PerUmeå universitet,Institutionen för strålningsvetenskaper(Swepub:umu)pebe0049 (author)
Löfroth, Per-Olov (author)
Henriksson, RogerUmeå universitet,Institutionen för strålningsvetenskaper(Swepub:umu)rohe0003 (author)
Bergenheim, A. TommyUmeå universitet,Neurokirurgi(Swepub:umu)tobe0004 (author)
Umeå universitetNeurokirurgi (creator_code:org_t)

By the author/editor: Lindvall, Peter; Bergström, Per; Löfroth, Per-Olo ...; Henriksson, Roge ...; Bergenheim, A. T ...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Cancer and Oncol ...

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