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

C A Nalder1, A M Bidmead1, C D Mubata1, D Tait2 and C Beardmore,2

1 Departments of Physics
2 Radiotherapy and Oncology, Royal Marsden NHS Trust, Fulham Road, London SW3 6JJ, UK



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  		Figure 1. The breast board used for routine treatment at The Royal Marsden Hospital. Board angle and arm pole positions are adjustable.

 


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  		Figure 2. An evacuated vac-fix bag positioned on the breast board.

 


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  		Figure 3. Cumulative frequency distributions of treatment block systematic errors in the anteroposterior direction with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 4. Cumulative frequency distributions of random errors in the anteroposterior direction with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 5. Cumulative frequency distributions of treatment block systematic errors in the superoinferior direction with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 6. Cumulative frequency distributions of random errors in the superoinferior direction with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 7. Cumulative frequency distributions of treatment block systematic rotational errors with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 8. Cumulative frequency distributions of random rotational errors with the standard technique ({circ}) and with vac-fix immobilization ({blacksquare}).

 


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  		Figure 9. Patients' responses to the question "How easy did you find it to maintain the treatment position over the last treatment block?" , with vac-fix immobilization; , no vac-fix immobilization.

 


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  		Figure 10. Patients' responses to the question "How comfortable did you find the treatment position over the last treatment block?" , with vac-fix immobilization; , no vac-fix immobilization.

 




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