Advanced Physics for Brachytherapy 2018

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