159 / 1195
Equivalent Uniform Dose - EUD
•
For tumours ‘a’ is negative
Typical range -5 (‘less malignant’) – meningioma
to -15 (‘more malignant’) - chordoma
•
For normal tissues ‘a’ is positive
Parallel - near 1
Serial – larger e.g. up to 20 for spinal cord
‘a’ = 1/n in the LKB formulation