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Table 1 Magnitude of pancreatic motion during respiration and PTV size for ITV and tumor tracking concept

From: Potential dosimetric benefits of adaptive tumor tracking over the internal target volume concept for stereotactic body radiation therapy of pancreatic cancer

 

Respiratory-induced motion amplitude (mm)

Patient

PTV ITV (cm 3)

PTV Tracking (cm 3)

AP

SI

LR

3D Motion

1

54.3

33

2.4

10.4

3.3

11.2

2

146.2

122.4

3.0

5.1

0.6

5.9

3

236.7

200.9

2.0

4.3

1.6

5.1

4

109.8

90.2

1.0

3.7

0.7

3.9

5

154.9

147.6

0.7

1.1

0.3

1.3

6

34.9

28.2

0.5

4.6

1.1

4.7

7

83.0

70.6

1.0

1.6

0.8

2.1

8

114.6

90.4

6.1

1.9

1.7

6.6

9

241.4

209.6

1.8

7.6

1.2

7.8

10

244.0

208.4

1.9

4.3

0.3

4.8

11

177.6

163.9

1.3

5.0

0.5

5.2

12

116.3

95.5

2.1

7.4

3.5

8.5

Median

131.3

109.0

1.9

4.5

1.0

5.2

(prctiles)

(96.4, 207.2)

(80.4, 182.4)

(1.0, 2.3)

(2.8, 6.3)

(0.6, 1.7)

(4.3, 7.2)

Mean

142.8

121.7

2.0

4.8

1.3

5.6

SD

71.2

64.6

1.5

2.7

1.1

2.7

  1. AP = anterior-posterior; SI = superior-inferior; LR = left- right plane; 3D = three dimensional; prctiles = (25-percentile, 75-percentile); SD = standard deviation