Brain 17 Vienna
Technical Procedure
Junction lines are moved 0.5-1.0 cm every 8-12 Gy
to avoid overdosing or underdosing segments of the cord
Procedure: 1. shortening the inferior margin of the lateral cranial fields 2. Symmetrically lengthening the superior and inferior margins of the posterior spine field 3. Shortening the cranail margin of the caudal spinal field 4. The caudal spinal field remains unchanged
moving junction
SSD 100 cm
SSD 100 cm
tumour
rotation of collimator according to divergence angle of upper spinal field
isocentre
Spinal canal
SSD : source to skin distance
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