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British Journal of Radiology (2006) 79, 808-817
© 2006 British Institute of Radiology
doi: 10.1259/bjr/24917728
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Accuracy and precision of an external-marker tracking-system for radiotherapy treatments

E M Donovan, PhD1, P Brabants2, P M Evans, DPhil1, J R N Symonds-Tayler, MSc1 and R Wilks, PhD3

1 Joint Department of Physics, Institute of Cancer Research and Royal Marsden Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, 2 QADOS Ltd, 5 Lakeside Business Park, Swan Lane, Sandhurst, Berkshire GU47 9DN, 3 Osiris Systems Ltd, Burraton Bungalow, Broadclyst, Exeter, Devon EX5 3DB, UK


Figure 1
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  		Figure 1. Photograph of the test object with markers. The photograph is taken from above the test object. The height of the object is 8.0 cm. There are three markers in a plane and one out-of-plane marker. One camera pair viewed the left-side, top and out-of-plane marker; a second camera pair viewed the top and right-side markers.

 

Figure 2
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  		Figure 2. Coordinates of circular motion inY–Z plane (Vertical: gun–target (GT) plane) using the Wellhofer beam data system.

 

Figure 3
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  		Figure 3. Summary of errors for linear motion. The plot shows the deviation from the exact to tracked position averaged over all five cycles of the linear movement.

 

Figure 4
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  		Figure 4. Summary of errors for circular motion. The values for each point are the average of the deviations from the calculated to tracked position.

 

Figure 5
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  		Figure 5. Summary of sampling intervals. Data are from linear and circular motion.

 

Figure 6
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  		Figure 6. Summary of errors for all points at all positions for the test object moved using the programmable platform.

 

Figure 7
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  		Figure 7. Data recorded from Osiris+ for displacement in X axis with time compared with programmed displacement for platform movement Ellipse 1.

 

Figure 8
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  		Figure 8. (a) Absolute error in position in the X direction for ellipse 1 for all points. (b) Absolute error in position in the Y direction for ellipse 1 for all points. (c) Absolute error in position in the Z direction for ellipse 1 for all points.

 




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