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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.
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| ExacTrac position verification | Device | Repeated measurement of patient head position with ExacTrac X-ray Monitoring |
| Measure | Description | Time Frame |
|---|---|---|
| 3D Head deviation | Length of 3D head position deviation during RT session | 5 to 20 days |
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Inclusion Criteria:
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5 Patients with a single intracranial tumour treated with stereotactic radiation therapy
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| Name | Affiliation | Role |
|---|---|---|
| Meinhard Nevinny-Stickel, MD, PhD | Medical University Innsbruck | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Medical University Innsbruck | Innsbruck | 6020 | Austria |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 31852497 | Derived | Mangesius J, Seppi T, Weigel R, Arnold CR, Vasiljevic D, Goebel G, Lukas P, Ganswindt U, Nevinny-Stickel M. Intrafractional 6D head movement increases with time of mask fixation during stereotactic intracranial RT-sessions. Radiat Oncol. 2019 Dec 18;14(1):231. doi: 10.1186/s13014-019-1425-7. |
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De-identified Datasets of all measured parameters will be made available
Data will be available after publication
The datasets used and analysed during the study will be available from the corresponding author on reasonable request
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jan 25, 2019 | Jan 25, 2019 | Prot_SAP_000.pdf |
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| ID | Term |
|---|---|
| D001932 | Brain Neoplasms |
| ID | Term |
|---|---|
| D016543 | Central Nervous System Neoplasms |
| D009423 | Nervous System Neoplasms |
| D009371 | Neoplasms by Site |
| D009369 | Neoplasms |
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| D001927 |
| Brain Diseases |
| D002493 | Central Nervous System Diseases |
| D009422 | Nervous System Diseases |