This young child with medulloblastoma was treated with technique described above.
First two figures illustrate the dose distribution for a pair of lateral cranial fields.
Next figures illustrate the dose distribution for single posterior spine field matched to brain. Dose uniformity is achieved with custom designed dose compensator.
Spinal dose: prescribed at the anterior surface of the spinal cord (post surface of vertebral bodies)
Cranial dose: prescribed at midplane at center of cranial volume (prescription point at or near the center of the target).
Dose uniformity – dose variations within each target volume should be within + 5% and – 5% of the prescription point dose.