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Related Experiment Videos

Three-dimensional treatment planning using electrocardiographically gated multi-detector row CT.

Kazunari Yamada1, Toshinori Soejima, Toshiaki Minami

  • 1Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Japan. yamadaka@tenriyorozu-hp.or.jp

International Journal of Radiation Oncology, Biology, Physics
|April 16, 2003
PubMed
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Electrocardiographically (ECG) gated CT imaging precisely visualizes internal organ motion from cardiac pulsation. This method improves radiation therapy planning for lung and liver tumors by accurately defining target volumes.

Area of Science:

  • Medical Imaging
  • Radiation Oncology
  • Cardiovascular Imaging

Background:

  • Accurate internal margin determination in radiation therapy requires understanding target motion.
  • Limited data exists on cardiac and aortic pulsation effects on internal organ motion.
  • Three-dimensional radiation treatment planning (3D-RTP) necessitates precise motion data.

Purpose of the Study:

  • To introduce a method for 3D-RTP using electrocardiographically (ECG) gated spiral CT scanning.
  • To visualize internal organ motion caused by cardiac motion using ECG-gated multidetector row CT.

Main Methods:

  • Five patients with lung or liver tumors underwent multidetector row CT under shallow inspiration breath-holding.
  • Retrospective ECG gating was employed, reconstructing data from specific cardiac cycle intervals.

Related Experiment Videos

  • Diastolic and systolic phase images were transferred to a 3D-RTP system for organ shift evaluation.

    • Main Results:

    • Cardiac contraction significantly impacts thoracic structures, pulmonary vessels, and liver position.
    • Movements exceeding 5 mm between diastolic and systolic phases were noted in the left ventricle, right atrium, and superior vena cava.
    • Two-phase imaging effectively demonstrated internal organ movement during cardiac contraction under breath-holding.

    Conclusions:

    • ECG-gated CT provides spatial information crucial for precise internal margin definition.
    • This technique enhances the planning target volume determination for moving lung and liver tumors compared to conventional CT planning.