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Technical note: the implementation of patient position correction using a megavoltage imaging device on a linear
P M Evans1, J Q Gildersleve, C Rawlings
1Joint Department of Physics, Royal Marsden Hospital, Sutton, Surrey, UK.
The British Journal of Radiology
|September 1, 1993
Summary
This study addresses patient set-up adjustments using megavoltage imaging. The treatment couch is the preferred adjustment method, but collimator adjustments are sometimes necessary for accurate patient positioning in radiation therapy.
Area of Science:
- Medical Physics
- Radiation Oncology
- Image-guided radiotherapy
Background:
- Accurate patient positioning is crucial for effective radiation therapy.
- Megavoltage imaging provides real-time data for set-up verification.
- Existing methods for patient set-up correction have limitations.
Purpose of the Study:
- To evaluate methods for adjusting patient set-up using megavoltage image analysis.
- To determine optimal strategies for rotational and translational corrections.
- To minimize parameter adjustments and patient position changes.
Main Methods:
- Analysis of megavoltage images for patient set-up assessment.
- Formulation of correction strategies for treatment couch and collimator adjustments.
- Consideration of gantry and couch angles for rotational and translational corrections.
Main Results:
- Treatment couch adjustment is generally the most desirable method for patient positioning.
- Rotational errors are not always correctable with couch adjustments at all gantry angles.
- Collimator jaw adjustments offer an alternative or supplementary correction method, particularly when higher precision is needed.
Conclusions:
- A combined approach using treatment couch and collimator adjustments optimizes patient set-up accuracy.
- The developed formulae are being utilized in an ongoing study to refine patient positioning during treatment.
- This research contributes to improving the precision and efficacy of radiation therapy delivery.