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.
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.
Somewhat difference could be seen between HR-CTVMR and HR-CTVCT.
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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
- Cervical cancer
- Image-guided brachytherapy
- High-risk clinical target volume