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Table 1 4DMRI reconstruction validation using phantom measurements. For two waveforms and various cycle times (T), the input amplitude (A) was compared to the motion amplitude from the reconstructed 4DMRIs. The underestimation was the difference between input and measured amplitude. The expected underestimation calculated for the two waveforms is given in the third column. The final column gives the difference between the reconstructed and expected underestimation

From: A novel amplitude binning strategy to handle irregular breathing during 4DMRI acquisition: improved imaging for radiotherapy purposes

Input motion

Reconstructed motion

Calculated expected motion

Difference

Wave form

T

A

A

measured underestimation

A

calculated underestimation

under-estimation

[s]

[mm]

[mm]

[mm]

[%]

[mm]

[mm]

[%]

[mm]

sin

5

40

37.5

2.5

6.3

38.0

2.0

5.1

0.5

30

28.1

1.9

6.2

28.5

1.5

0.3

20

18.8

1.3

6.3

19.0

1.0

0.2

10

9.4

0.6

6.1

9.5

0.5

0.1

sin

4

40

37.5

2.5

6.3

38.0

2.0

5.1

0.5

30

28.1

1.9

6.2

28.5

1.5

0.3

20

18.0

2.0

10.0

19.0

1.0

1.0

10

9.4

0.6

6.2

9.5

0.5

0.1

sin

3

30

27.3

2.7

8.9

28.5

1.5

5.1

1.1

20

18.8

1.3

6.3

19.0

1.0

0.2

10

9.4

0.6

6.2

9.5

0.5

0.1

cos6

5

30

28.9

1.1

3.6

29.2

0.8

2.8

0.3

20

18.8

1.3

6.3

19.4

0.6

0.7

10

9.4

0.6

6.2

9.7

0.3

0.3

cos6

4

26

24.2

1.8

6.8

25.3

0.7

2.8

1.1

20

19.5

0.5

2.4

19.4

0.6

−0.1

10

9.4

0.6

6.1

9.7

0.3

0.3

cos6

3

20

19.5

0.5

2.3

19.4

0.6

2.8

−0.1

10

9.4

0.6

6.2

9.7

0.3

0.3

sin

4

20

18.8

1.3

6.3

19.0

1.0

5.1

0.2

20

18.7

1.3

6.3

19.0

1.0

0.2

20

18.8

1.3

6.3

19.0

1.0

0.2

20

18.8

1.2

6.2

19.0

1.0

0.2