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. 2013 Sep 9;75(1):53–57. doi: 10.1055/s-0033-1354579

Fig. 1.

Fig. 1

A patient with a clivus chordoma. Five treatment fields were used for the planning target volume (PTV) 50.4 CGE (delivered dose: 54 CGE). (A) Axial view showing the two pairs of patch fields: First pair is left anterior oblique–through (LAO-T) and left posterior oblique–patch (LPO-P); second pair is right anterior oblique–through (RAO-T) and right posterior oblique–patch (RPO-P). The through beams (LAO-T and RAO-T) are laterally blocked to avoid the brainstem. The residual target volumes are covered by the patch fields (LPO-P and RPO-P) coming from the posterior. (B) Sagittal view showing the 5th superior anterior oblique (SAO) beam. This beam angle allows the brainstem to be blocked while essentially covering the whole target. Also shown is the boost target volume, PTV 73.8 CGE.