Brain Metastases, Adult
Conditions
Brief summary
This 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. Intrafractional deviation of mask-fixed head positions is measured in five patients during a total of 94 fractions by means of close-meshed repeated ExacTrac measurements conducted during the entire treatment session. From the obtained data the investigators evaluate the need to adjust safety margins around the gross tumor volume (GTV) whenever the investigated thermoplastic mask is used instead of invasive ring fixation.
Interventions
DEVICEExacTrac position verification
Repeated measurement of patient head position with ExacTrac X-ray Monitoring
Sponsors
Medical University Innsbruck
Study design
Observational model
CASE_ONLY
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* single intracranial tumour or metastasis * stereotactic radiation therapy planned * immobilization with thermoplastic mask
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 3D Head deviation | 5 to 20 days | Length of 3D head position deviation during RT session |
Countries
Austria
Outcome results
None listed