Patent ID: 8494116

Claim:
A treatment planning method for treating a lesion at or adjacent to the retina of an eye of a patient, comprising: (a) determining, based on known spectral and intensity characteristics of a source beam along at least two treatment beam paths from a source of a collimated x-radiation beam and from coordinates of the lesion in an aligned patient-eye position, a total treatment time for irradiation along the beam paths that is effective to produce a desired radiation dose at the lesion; (b) determining, based on known spectral and intensity characteristics of the source beam along the beam paths and from coordinates of the optic nerve in the aligned patient-eye position, an extent and duration of eye movement, away from the aligned patient-eye position in a direction that moves the patient's optic nerve toward the irradiation beam, that will be allowed during treatment, while maintaining a radiation dose at the patient optic nerve below a predetermined dose level; and (c) directing the source, based on the determined treatment time and the determined extent and duration of eye movement, to emit the x-radiation beam to deliver the desired radiation to the lesion.