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Problems:
- Limitations on length of field (20-25 cm)
- Dosimetry at junctions
- Possible variations in dose to CTV because of attenuation by bone
- Dose gradient in vertebrae
- Increased dose to lungs
- Use of energies < 22 MEV are associated with an excess of failures (Carrie,
1992)
- Use with care !
Electrons for the spinal axis