Estimation of Radiotherapy Dose Fields from a Few Projections: How Many Projections will Ensure Uniqueness?
Résumé
The cross-section of the dose field generated by a linac with multi-leaf collimators (MLC) can be examined using scintillating fiber technology to obtain a few parallel projections of this (nearly) binary image. We examine ambiguity of the reconstructions when using only six projections, and demonstrate that unique solutions cannot be ensured. We suggest alternative approaches or conditions on the MLC configuration that would restore unicity.