Potential Uncertainty about Image Registration in Thoracic Image-guided Radiotherapy

DOI Web Site PubMed 14 References Open Access
  • Kai Yudai
    Department of Radiological Technology, Kumamoto University Hospital
  • Kai Naoki
    Course of Radiological Sciences, Graduate School of Health Sciences, Kumamoto University
  • Fujita Yujiro
    Course of Radiological Sciences, Graduate School of Health Sciences, Kumamoto University
  • Maruyama Masato
    Department of Radiological Technology, Kumamoto University Hospital
  • Nakaguchi Yuji
    Department of Radiological Technology, Kumamoto University Hospital
  • Kuraoka Akiko
    Department of Radiological Technology, Kumamoto University Hospital
  • Saito Tetsuo
    Department of Radiation Oncology, Kumamoto University Hospital
  • Murakami Ryuji
    Department of Medical Imaging, Faculty of Life Sciences, Kumamoto University

Bibliographic Information

Other Title
  • 胸部の画像誘導放射線治療における画像照合の不確かさに関する検討
  • 臨床技術 胸部の画像誘導放射線治療における画像照合の不確かさに関する検討
  • リンショウ ギジュツ キョウブ ノ ガゾウ ユウドウ ホウシャセン チリョウ ニ オケル ガゾウ ショウゴウ ノ フ タシカ サ ニ カンスル ケントウ

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Purpose: Although image-guided radiotherapy (IGRT) is widely used to determine and correct daily setup errors, the additional interpretation for image registration would provide another error. We evaluated the uncertainty in image registration in IGRT. Method: The subjects consisted of 12 consecutive patients treated with IGRT for thoracic esophageal cancer. Two radiation therapists had consensually achieved daily 3D registration between planning computed tomography (CT) and cone beam CT (CBCT). The original data sets of image registration in all fractions except for boost irradiations with a change in the isocenter positions were selected for evaluation. There were 20 to 32 data sets for each patient: a total of 318 data sets. To evaluate daily setup errors, the mean 3D displacement vector was calculated for each patient. To assess the reproducibility of image registration, two other radiation therapists reviewed the data sets and recorded geometric differences as uncertainty in the image registration. Results: The mean 3D displacement vector for each patient ranged from 4.9 to 15.5 mm for setup errors and 0.7 to 2.2 mm for uncertainty in image registration. There was a positive correlation between the 3D vectors for setup error and uncertainty in image registration (r = 0.487, p = 0.016). Conclusion: Although IGRT can correct the setup errors, potential uncertainty exists in image registration. The setup error would disturb the image registration in IGRT.

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