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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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SU-E-J-139: Feasibility of Using EPID for Real-Time Target Localization during Treatment.

Q Xu1,2, M Lin1,2, X Chen1,2

  • 13rd Affiliated Hospital of Qiqihar Medical University, Qiqihar.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
AnatomyCancerDigital image processingDigital radiographyImage guided radiation therapyIntensity modulated radiation therapyLungsMedical imagingMultileaf collimatorsTherapeutics

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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.