Table 1 Spatial resolution in terms of FWHM and FWTM for experimental and simulated data. For each profile, the difference between simulated and experimental data (in mm) is also reported 

1 cm radial offset

 Radial

4.34

8.48

3.37

7.53

− 0.98

− 0.96

 Tangential

4.17

8.20

3.64

7.47

− 0.54

− 0.73

 Axial

4.49

10.07

4.25

8.26

− 0.24

− 1.82

10 cm radial offset

 Radial

5.66

11.30

5.18

9.97

− 0.49

− 1.37

 Tangential

4.40

9.77

4.10

8.15

− 0.31

− 1.64

 Axial

6.21

11.79

4.98

10.78

− 1.24

− 1.01

20 cm radial offset

 Radial

7.27

14.35

7.11

13.02

− 0.16

− 1.34

 Tangential

5.10

9.88

4.67

9.21

− 0.43

− 0.68

 Axial

6.29

12.45

5.82

11.81

− 0.47

− 0.65