Setup Accuracy of Stereotactic Body Radiation Therapy (SBRT) Using Virtual Isocenter in Image-guided Radiation Therapy (IGRT)

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  • Nakazawa Hisato
    Nagoya Radiosurgery Center, Nagoya Kyoritsu Hospital Program in Radiological and Medical Laboratory Sciences, Graduate School of Medicine, Nagoya University
  • Uchiyama Yukio
    Nagoya Radiosurgery Center, Nagoya Kyoritsu Hospital
  • Komori Masataka
    Program in Radiological and Medical Laboratory Sciences, Graduate School of Medicine, Nagoya University
  • Hagiwara Masahiro
    Nagoya Radiosurgery Center, Nagoya Kyoritsu Hospital
  • Mori Yoshimasa
    Department of Radiology and Radiation Oncology, Nagoya City University Graduate School of Medical Sciences

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Other Title
  • 画像誘導放射線治療における仮想アイソセンタを利用した体幹部定位照射の位置決め精度の検討
  • 臨床技術 画像誘導放射線治療における仮想アイソセンタを利用した体幹部定位照射の位置決め精度の検討
  • リンショウ ギジュツ ガゾウ ユウドウ ホウシャセン チリョウ ニ オケル カソウ アイソセンタ オ リヨウ シタ カラダ カンブ テイイ ショウシャ ノ イチギメ セイド ノ ケントウ

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Abstract

We use Novalis Body system for stereotactic body radiation therapy (SBRT) in lung and liver tumors. Novalis system is dedicated to SBRT with image-guided patient setup system ExacTrac. The spinal bone is the main landmark in patient setup during SBRT using ExacTrac kV X-ray system. When the target tumor is located laterally distant from the spinal bone at the midline, it is difficult to ensure the accuracy of the setup, especially if there are rotational gaps (yaw, pitch and roll) in the setup. For this, we resolve the problem by using a virtual isocenter (VIC) different from isocenter (IC) .We evaluated the setup accuracy in a rand phantom by using VIC and checked the setup errors using rand phantom and patient cases by our original method during the setup for IC. The accuracy of setup using VIC was less than 1.0 mm. Our original method was useful for checking patient setup when VIC used.

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