Influence of a vac-fix immobilization device on the accuracy of patient positioning during routine breast radiotherapy

The British Journal of Radiology
C A NalderC Beardmore

Abstract

Continued use of basic planning and treatment techniques, in contrast to the improved methods implemented at many other anatomical sites, has emphasized the need for improved breast dosimetry. Any future technique delivering a superior three-dimensional dose distribution will be of maximum benefit if set-up errors are minimized. To determine the influence of vacuum moulded bag (vac-fix) immobilization on routine breast radiotherapy, 17 patients received half their radiotherapy fractions using our standard breast board technique and half using a vac-fix device positioned on the breast board. Treatment accuracy and reproducibility were assessed for each technique using daily electronic portal imaging and were analysed in terms of random and systematic translational and rotational displacements of treatment fields with respect to corresponding simulation images. In addition, patients completed a short questionnaire aimed at determining which technique they preferred. Results showed that random errors for the two techniques did not differ significantly. Approximately 80% of random translations recorded were less than 3 mm and 80% of random rotations were less than 1.5 degrees. Systematic errors showed some improvement with the vac-...Continue Reading

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Citations

Jan 23, 2016·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Mark NiglasJustin Lee
Feb 12, 2008·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Ramachandran PrabhakarG S Pant
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Jul 1, 2018·Journal of Applied Clinical Medical Physics·Marguerite TyranHugues Mailleux
May 23, 2008·Physics in Medicine and Biology·Philip M Evans
Jan 23, 2016·Physics in Medicine and Biology·Tristan C F van HeijstBram van Asselen
Jan 10, 2020·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Marie-Claude BistonSéverine Racadot

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