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. 2009 Sep 24;24(5):894–903. doi: 10.3346/jkms.2009.24.5.894

Fig. 5.

Fig. 5

Balloon displacement by rectal gas identified on the megavoltage CT (MVCT) scan of helical tomotherapy. (A) Rectal gas and balloon on MVCT image (yellow). (B) Balloon on the initial CT image (gray). (C) Unmatched balloon surface between the MVCT and initial CT image.