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Table 3 Range of volume over/under-estimation as a function of motion amplitude for the three scan modes.

From: Phantom investigation of 3D motion-dependent volume aliasing during CT simulation for radiation therapy planning

Target Diameter (mm)

S-I Motion Amplitude ± (mm)

Single-slice Fast

Multi-slice Fast

Single-slice Slow

  

Min

Mean

1σ

Max

Min

Mean

1σ

Max

Min

Mean

1σ

Max

 

5

0.99

2.52

1.02

3.78

1.66

2.85

0.70

3.74

3.88

4.57

0.62

5.60

 

10

2.35

2.68

0.21

2.92

3.07

3.61

0.37

4.2

5.71

6.84

0.99

8.42

10

15

2.27

3.38

1.07

4.98

4.11

4.65

0.39

5.21

10.1

11.1

0.60

11.7

 

5

1.22

1.35

0.08

1.44

1.54

1.56

0.03

1.62

1.52

1.60

0.06

1.67

 

10

1.39

1.45

0.03

1.50

1.7

1.79

0.05

1.87

1.78

1.89

0.07

1.97

31.5

15

1.50

1.57

0.05

1.64

2.02

2.08

0.05

2.15

2.09

2.26

0.11

2.41

  1. Each target motion in the S-I direction was synchronized with a fixed rotational motion to initiate an R-L and an A-P displacement of ± 2 and ± 5 mm, respectively.
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Radiation Oncology

ISSN: 1748-717X

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