Table 1 Basic characteristics of 93 multimodal images

Modalities

 CT/MRI

48

 PET-containing

45

Fusion algorithm

 Automatic fusion

31

 Manual fusion

31

 Registration point-based fusion

31

Nature of tumor

 Benign

30

 Malignant

63

Location of tumor

 Maxilla

57

 Mandible

36

Dental artifacts

 Absent

78

 Present

15

Change of patients’ position

 Absent

60

 Present

33

Gross tumor volume (cm³)

31.67 ± 31.62

Interval days between different scans

7.76 ± 6.36

Thinner slice thickness (mm)

1.57 ± 0.70

Thicker slice thickness (mm)

3.03 ± 1.18

Lower pixel pitch (mm)

0.44 ± 0.13

Higher pixel pitch (mm)

1.92 ± 1.62