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Historical Reconstructions Methods in Brachytherapy
1. Orthogonal x rays
Strengths
high spatial resolution (< 0.5 mm)
less susceptible to high-Z artifacts than CT
Weaknesses
not suitable for dozens of seeds
planar representation of 3D anatomy
limited by magnification uncertainty
2. Stereo shifts (table/couch or x-ray tube)
Strengths
good spatial resolution (~1 mm)
Weaknesses
highly sensitive to uncertainties in shift direction
limited perspective
3. Fluoroscopy
Strengths
practical for intraoperative imaging
Weaknesses
crude 3D representation