Intrafractional 6D head movement increases with time of mask fixation during stereotactic intracranial RT-sessions.

ABSTRACT:

Background

The present study investigates the intrafractional accuracy of a frameless thermoplastic mask used for head immobilization during stereotactic radiotherapy. Non-invasive masks cannot completely prohibit head movements. Previous studies attempted to estimate the magnitude of intrafractional inaccuracy by means of pre- and postfractional measurements only. However, this might not be sufficient to accurately map also intrafractional head movements.

Materials and methods

Intrafractional deviation of mask-fixed head positions was measured in five patients during a total of 94 fractions by means of close-meshed repeated ExacTrac measurements (every 1.4 min) conducted during the entire treatment session. A median of six (range: 4 to 11) measurements were recorded per fra

SUBMITTER: Mangesius J 

PROVIDER: S-EPMC6921566 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature