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SU-E-J-139: Feasibility of Using EPID for Real-Time Target Localization during Treatment
Medical Physics
|May 19, 2017
Summary
Electronic portal imaging device (EPID) images can be used for real-time target localization in radiotherapy. This study shows EPID feasibility for intrafractional target motion correction in advanced treatments.
Area of Science:
- Medical Physics
- Radiation Oncology
- Image-guided Therapy
Background:
- Real-time target localization is crucial for precise radiotherapy delivery.
- Electronic Portal Imaging Devices (EPIDs) offer a potential solution for continuous monitoring during treatment.
Purpose of the Study:
- To assess the feasibility of using EPID images for real-time target localization.
- To evaluate the utility of EPID imaging for intrafractional target motion correction in Intensity-Modulated Radiation Therapy (IMRT) and RapidArc treatments.
Main Methods:
- Forty-one patients (37 prostate, 4 lung) undergoing IMRT or RapidArc were studied.
- Fiducial markers were implanted in tumors; Digital Reference Images (DRRs) were reconstructed.
- The probability of visualizing fiducial markers on EPID images during treatment was calculated.
Main Results:
- For prostate IMRT without lymph nodes, probabilities of seeing 1-4 markers ranged from 50% to 12%.
- For prostate IMRT with lymph nodes, probabilities ranged from 41% to 7%.
- Prostate RapidArc showed higher probabilities (74-81%), while lung IMRT was 34% for at least one marker.
Conclusions:
- Continuous EPID image acquisition provides adequate information for real-time target localization.
- EPID imaging facilitates intrafractional target motion correction in advanced radiotherapy techniques.
