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Updated: Jun 10, 2026
08:54
Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
Published on: May 8, 2018
Respiratory motion control for stereotactic and robotic liver interventions
Gerlig Widmann1, Peter Schullian, Marion Haidu
1Department of Microinvasive Therapy, Department of Radiology, Medical University of Innsbruck, Austria.
Summary
Temporary endotracheal tube (ETT) disconnections safely control respiratory motion for liver interventions. This method achieved motion control within 4 mm, crucial for stereotactic and robotic procedures.
Area of Science:
- Medical Interventions
- Respiratory Motion Management
- Surgical Navigation
Background:
- Accurate liver interventions require precise control of respiratory motion.
- Stereotactic, computer-assisted, and robotic procedures are particularly sensitive to motion artifacts.
Purpose of the Study:
- To evaluate the efficacy of temporary endotracheal tube (ETT) disconnections for respiratory motion control during CT-guided liver interventions.
- To quantify the respiratory motion control error (RMCE) associated with this technique.
Main Methods:
- Evaluated RMCE in 26 anaesthetized patients undergoing CT-guided liver punctures.
- Utilized temporary ETT disconnections during contrast-enhanced planning CTs and a post-puncture native CT.
- Calculated RMCE by comparing Euclidean errors of internal and external targets between single and double ETT disconnections.
Main Results:
- The mean RMCE was 1.98 ± 0.93 mm for external targets and 1.41 ± 0.75 mm for internal targets.
- No statistically significant difference was observed between the means for external and internal targets (p = 0.558).
- No complications were reported during the study.
Conclusions:
- Temporary ETT disconnections are a safe method for managing respiratory motion in liver interventions.
- This technique can achieve respiratory motion control within a 4 mm margin, suitable for stereotactic and robotic procedures.
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