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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Related Experiment Video

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
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Evaluation of two synchronized external surrogates for 4D CT sorting.

Carri K Glide-Hurst1, Megan Schwenker Smith, Munther Ajlouni

  • 1Henry Ford Health System. churst2@hfhs.org.

Journal of Applied Clinical Medical Physics
|November 22, 2013
PubMed
Summary

Varian

Area of Science:

  • Medical Physics
  • Radiotherapy
  • Image-guided therapy

Background:

  • Accurate patient motion monitoring is crucial for 4D CT in radiotherapy.
  • Varian's Real-Time Position Management (RPM) and Philips' pneumatic bellows are common external surrogates.
  • Quantifying their comparative performance is essential for treatment planning.

Purpose of the Study:

  • To quantify the performance and agreement between Varian RPM and Philips bellows systems.
  • To evaluate their utility in waveform and 4D CT image analysis for radiotherapy.

Main Methods:

  • Simultaneous 4D CT acquisition with both RPM and bellows systems on a motion platform.
  • Analysis of breathing curves, target volumes, and image quality metrics (Dice, overlap).
  • Prospective patient study to assess latency and agreement.

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Main Results:

  • Near-perfect correlation between RPM and bellows breathing traces (r=0.987-0.999).
  • No significant differences in target volumes or centroid variations.
  • Latency between systems was < 100 ms, with negligible impact on image quality.

Conclusions:

  • Varian RPM and Philips bellows systems demonstrate equivalent performance as external surrogates for 4D CT.
  • Both systems are suitable for radiotherapy treatment planning, ensuring accurate motion management.