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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

Patient

Name of disease

Tumor localization

Pre-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

1

Liver metastasis (ascending colon cancer)

Right lobe of the liver

335.3

223.8

0.24

Transverse colon

2

Hepatocellular carcinoma

Right lobe of the liver

25.1

34.1

0.24

Transverse colon

3

Hepatocellular carcinoma

Right lobe of the liver

723.0

807.2

2.00

Transverse colon

4

Leiomyoma

Inferior vena cava

730.2

729.3

0.72

Duodenum

5

Leiomyoma

Right lobe of the liver

174.6

200.4

1.14

Duodenum

6

Local recurrence (sigmoid colon cancer)

Pelvic floor

37.9

42.6

8.78

Sigmoid colon

7

Bone metastasis (uterine corpus cancer)

Left acetabular & sacrum

443.2

470.8

0.43

Sigmoid colon

8

Local recurrence (rectal cancer)

Pelvic floor

262.4

265.9

1.25

Small bowel

9

Lymph node metastasis (cancer of unknown primary)

Left side of the pelvis

3022.2

3575.7

1.90

Small bowel

10

Chordoma

Sacrum

283.7

259.8

4.04

Small 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