The 2D-ARRAY seven29 A new way of dosimetric verification of - PTW
The 2D-ARRAY seven29 A new way of dosimetric verification of - PTW
The 2D-ARRAY seven29 A new way of dosimetric verification of - PTW
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6.2 Head and neck<br />
For postoperative head and neck patients, we also use an SIB IMRT technique with seven<br />
treatment fields. <strong>The</strong> former tumor volume is irradiated simultaneously with a higher dose level<br />
than the elective lymph nodes. <strong>The</strong> spinal cord and the contralateral parotid gland are spared. An<br />
example for a head and neck treatment plan was already shown in Fig. 2.<br />
<strong>The</strong> <strong>verification</strong> results for all seven fields <strong>of</strong> that plan are depicted in Fig. 19. As already discussed<br />
in Section 5.7, it is normal for such highly modulated fields that some small areas within the lowdose<br />
part <strong>of</strong> the dose distributions show gamma values >1.<br />
Field 1 Field 2 Field 3 Field 4<br />
Field 5<br />
Field 6<br />
Figure 19: Isodose overlays and gamma distributions <strong>of</strong> all seven IMRT fields <strong>of</strong> a head and neck treatment plan (measured<br />
isodose lines are dotted). Because <strong>of</strong> the more complex modulation, some gamma values within the low-dose regions are<br />
>1 (see discussion in Section 5.7).<br />
14 / 16<br />
Field 7
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