Comparison of CT-based and MRI-based high-risk clinical target volumes in image guided-brachytherapy for cervical cancer, referencing recommendations from the Japanese Radiation Oncology Study Group (JROSG) and consensus statement guidelines from the Groupe Européen de Curiethérapie-European Society for Therapeutic Radiology and Oncology (GEC ESTRO)

Abstract

Purpose

The Working Group of the Gynecological Tumor Committee of the Japanese Radiation Oncology Study Group (JROSG) published recommendations for contouring high-risk clinical target volumes (HR-CTV) on CT for 3-dimentional image-guided brachytherapy for cervical cancer. The purpose of this study was to compare HR-CTV delineated on CT, referencing recommendations from JROSG, with HR-CTV delineated on MRI, referencing consensus guidelines from the Groupe Européen de Curiethérapie-European Society for Therapeutic Radiology and Oncology (GEC ESTRO).

Material and methods

Fourteen patients were evaluated. After the insertion of the CT/MR applicator into the patient, CT and MRI were performed. HR-CTVMR was delineated on MRI for clinical examination and HR-CTVCT was delineated on CT retrospectively referencing the MRI just before brachytherapy within a week. The volume and dosimetry of HR-CTV based on a 6 Gy dose of the Manchester system were evaluated.

Results

The median volumes of HR-CTVMR and HR-CTVCT were 24.4 ml (range, 13.6–50.4 ml) and 29.9 ml (range, 13.2–49.2 ml), respectively. Median D90 of HR-CTVMR and HR-CTVCT were 6.7 Gy (range, 5.8–10.1 Gy) and 6.8 Gy (range, 5.1–10.4 Gy), respectively.

Conclusion

Somewhat difference could be seen between HR-CTVMR and HR-CTVCT.

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Correspondence to Yuma Iwai.

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This study was approved by the local ethics review board and subjects’ informed consent were obtained.

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Iwai, Y., Nemoto, M.W., Horikoshi, T. et al. Comparison of CT-based and MRI-based high-risk clinical target volumes in image guided-brachytherapy for cervical cancer, referencing recommendations from the Japanese Radiation Oncology Study Group (JROSG) and consensus statement guidelines from the Groupe Européen de Curiethérapie-European Society for Therapeutic Radiology and Oncology (GEC ESTRO). Jpn J Radiol 38, 899–905 (2020). https://doi.org/10.1007/s11604-020-00980-y

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Keywords

  • Cervical cancer
  • Image-guided brachytherapy
  • High-risk clinical target volume
  • MRI