AROI-ESTRO GYN Teaching Course

Organ Motion: Intrafraction

• 7 studies N= 92 patients

• Cinematic-MRI, VB/MVCT and portal imaging before

and after each fraction.

• Mean range of 0.1-3.0 mm.

• Displacements greater than 5 mm occurred less than 3%

of the time

• No predominance in direction

Heijkoop, Sabrina T., et al. "Quantification of intra-fraction changes during radiotherapy of cervical cancer assessed with pre-and post-fraction Cone Beam CT scans." Radiotherapy and Oncology (2015).