The difference between gross tumor volume and biological target volume in postoperative local recurrent rectal cancer: A preliminary study of PET/CT radiation therapy planning

Keiichi Jingu, Ken Takeda, Takahiro Metoki, Yoshihiro Ogawa, Hisanori Ariga, Shogo Yamada, Yoshihiro Takai, Yoshiyuki Hosogai, Tomohiro Kaneda, Masatoshi Mitsuya, Satoru Watanabe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Purpose: To reveal the difference of gross tumor volume (GTV) in CT with biological target volume (BTV) in positron emission tomography using 18F-fluorodeoxyglucose with computed tomography (FDG-PET/CT). Materials and Methods: In 7 patients with postoperative local recurrence rectal cancer, three independent radiation oncologists delineated target volume on CT and PET, respectively, and compared the volume of GTV with that of BTV using the two-factor repeated measures ANOVA. FDG-PET/CT was performed in the same position as radiotherapy. The images by CT and PET were sent to the radiation therapy planning system as the DICOM datum, respectively, and fused those images using DICOM information. Each radiation oncologist delineated the abnormal shadow on CT as GTV and delineated macroscopically the region with high FDG accumulation using the tumor/muscle ratio. Results: In those seven patients, mean GTV was 77.2±53.6 cm3 and mean BTV was 58.0±48.0 cm3, and BTV was statistically smaller than GTV (p<0.001). There was a strong correlation between GTV and BTV (r=0.952, p<0.001). In patients with local recurrent rectal cancer, there were no significant differences among radiation oncologists (F (2, 18)=0.654, MSe=5220.046, p=0.532). Conclusion: There was a significant difference between the target volume on functional image (PET/CT) and the target volume on morphologic image (CT) in the patients with local recurrent rectal cancer.

Original languageEnglish
Pages (from-to)127-131
Number of pages5
JournalJournal of JASTRO
Volume20
Issue number3
Publication statusPublished - 2008 Sep

Keywords

  • Biological target volume
  • PET/CT radiation therapy planning
  • Recurrent rectal cancer

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Oncology

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