NEMA NU 4 FWHM and FWTM Resolution Values at Different Radial Positions
| 5 mm | 10 mm | 15 mm | 25 mm | |||||
| Parameter | FWHM | FWTM | FWHM | FWTM | FWHM | FWTM | FWHM | FWTM |
| At axial center | ||||||||
| Radial | 1.50 | 3.29 | 1.49 | 3.32 | 1.97 | 4.07 | 2.01 | 4.05 |
| Tangential | 1.32 | 3.14 | 1.39 | 3.38 | 1.54 | 3.61 | 1.65 | 3.85 |
| Axial | 0.91 | 2.85 | 1.16 | 2.93 | 1.67 | 3.33 | 1.57 | 3.42 |
| At ¼ axial FOV from center | ||||||||
| Radial | 1.41 | 3.27 | 1.49 | 3.24 | 1.81 | 3.84 | 2.03 | 4.11 |
| Tangential | 1.33 | 3.17 | 1.43 | 3.29 | 1.48 | 3.52 | 1.70 | 3.87 |
| Axial | 1.23 | 2.92 | 0.97 | 3.10 | 1.49 | 3.38 | 1.89 | 4.10 |
FWHM = full width at half maximum; FWTM = full width at tenth maximum.
Data are for reconstructed image pixel size of 0.14625 mm and slice thickness of 0.585 mm.