1997: Treatment of the first patients

1997: Treatment of the first patients

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In december '97 the GSI heavy ion radiotherapy started with the irradiation of the first two patients. The picture shows one of the patients - suffering from a brain tumor - in a fixation mask on the treatment couch. Below and above the patient's head the two parts of the PET camera can be seen - hidden behind the white covering. During irradiation the carbon beam beam enters through the small gold-coloured rectangular area in the background. (Photography: A. Zschau, GSI)

Distribution of the physical dose overlaid as a colourwash display over a CT image of a patient's brain (red colour corresponds to high doses). The dose was optimized in order to give a homogeneous biologically equivalent dose in the target volume. Hence the physical dose is not constant but decreases towards the distal edge of the target volume due to the increasing RBE.

Distribution of positron emitters measured with the PET camera. The maximum activity is found towards the distal edge of the target volume, as it is expected. This is because the PET camera is sensitive to the stopping 11C and 10C nuclei which are found mostly in the distal part. It should be noted that the positron emitter distribution is neither equivalent nor proportional to the dose distribution. Nevertheless PET monitoring offers a unique tool to control the precision of the irradiation as well as the treatment plan.



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Last update: January 29th 2003, M.Kraemer@gsi.de, Design: Marcus Winter, M.Winter@gsi.de