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Hasan et al. IJROBP 70:619-625. 2008
Image guidance with different surrogates for lumpectomy cavity
27 patients with
two CT scans
, three CT registration methods
bony structures clip positions surface matching
residual error
7 ± 2 mm 3 ± 2 mm 5 ± 2 mm
clip registration
provided
better
localization in 93% of cases compared to bony structures
surface matching improved cavity localization in 70% of cases compared to bony structures
mean improvements for clips and surface to bones were 4 and 2 mm, respectively
residual error = distance between the COMs of the cavity in the reference and second scans