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Table 1 Interfraction errors measured by matching CBCT setup/pre with CT planning

From: Organ motion in linac-based SBRT for glottic cancer

Interfraction thyroid cartilage motion (mm)
Error type X Y Z
µ − 0.1 − 0.3 -0.6
0.9 1.3 0.6
σ 1.1 1.3 0.7
  1. ∑, systematic error; σ, random error; µ, average of errors; X, left-right; Y, cranio-caudal; Z, antero-posterior; CBCTsetup, first scan made after setting up the patient on the treatment couch with the room lasers; CBCTpre, second scan possibly performed immediately before treatment