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British Journal of Radiology (2006) 79, S79-S86
© 2006 British Institute of Radiology
doi: 10.1259/bjr/88849490
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Kilovoltage CT using a linac-CT scanner combination

C Thieke, MD, PhD 1 U Malsch, MS 2 W Schlegel, PhD 2 J Debus, MD, PhD 1 P Huber, MD, PhD 1 R Bendl, PhD 2 and C Thilmann, MD, MS 1

1 Department of Radiation Oncology, University Hospital of Heidelberg and German Cancer Research Center, Heidelberg, 2 Department of Medical Physics, German Cancer Research Center, Heidelberg, Germany


Figure 1
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  		Figure 1. Treatment room with the Siemens Primatom at DKFZ Heidelberg. The linear accelerator and the CT scanner on rails share the same couch, which is rotated by 90° to switch between CT scanning and treatment position.

 

Figure 2
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  		Figure 2. Interfractional setup errors inx, y, z direction of 10 prostate patients, based on bony anatomy calculated by the rigid correlation matcher. For each patient, the mean translational error and its standard deviation is plotted.

 

Figure 3
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  		Figure 3. Interfractional setup errors inx, y, z direction of seven paraspinal patients, based on bony anatomy calculated by the rigid correlation matcher. For each patient, the mean translational error and its standard deviation is plotted.

 

Figure 4
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  		Figure 4. Planning CT scan and control CT scan at fraction 20 of the paraspinal case#7. The contours of the target volume, the boost volume and the spinal cord are also shown.

 

Figure 5
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  		Figure 5. Exemplary head and neck case– comparison of planning CT and control CT at fraction 20. In the first row the good repositioning in the upper part of the target can be seen, and the second row shows the error of approximately 1.5 cm along the y-axis in the lower part of the target volume.

 

Figure 6
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  		Figure 6. Same case as inFigure 5Go. Dose–volume histograms of (a) original plan, applied to planning CT, (b) original plan, applied to fraction 20 with updated contours and (c) re-optimized plan. For better comparison, the 80% dose/90% volume point is highlighted. The structures are 1-upper target volume, 2-lower target volume, 3-left parotid gland, 4-spinal cord, 5-right parotid gland.

 




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