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Table 1 Patient characteristics

From: In silico comparison of the dosimetric impacts of a greater omentum spacer for abdominal and pelvic tumors in carbon-ion, proton and photon radiotherapy

PatientName of diseaseTumor localizationPre-spacer PTV volume (cc)Post-spacer PTV volume (cc)Separation
Distancea (cm)
Part of the GI tract most adjacent to the PTV on post-spacer CT
1Liver metastasis (ascending colon cancer)Right lobe of the liver335.3223.80.24Transverse colon
2Hepatocellular carcinomaRight lobe of the liver25.134.10.24Transverse colon
3Hepatocellular carcinomaRight lobe of the liver723.0807.22.00Transverse colon
4LeiomyomaInferior vena cava730.2729.30.72Duodenum
5LeiomyomaRight lobe of the liver174.6200.41.14Duodenum
6Local recurrence (sigmoid colon cancer)Pelvic floor37.942.68.78Sigmoid colon
7Bone metastasis (uterine corpus cancer)Left acetabular & sacrum443.2470.80.43Sigmoid colon
8Local recurrence (rectal cancer)Pelvic floor262.4265.91.25Small bowel
9Lymph node metastasis (cancer of unknown primary)Left side of the pelvis3022.23575.71.90Small bowel
10ChordomaSacrum283.7259.84.04Small bowel
  1. aThe separation distance from the GI tract to the PTV was defined as the shortest distance without overlap by expanding the PTV in three dimensions
  2. Abbreviations: PTV Planning target volume, GI tract Gastrointestinal tract