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Table 4: Results of PSF measurements
Variable FWHM, in mm
Aquilion 64 Brilliance 64 LightSpeed 64 Sensation 64
In-plane 0.68 0.52 0.68 0.48
Longitudinal 0.81 0.84 0.98 0.70
Ratio in-plane/longitudinal 0.84 0.62 0.69 0.69
Note:—PSF indicates point spread function; FWHM, full width half maximum.
Variable	FWHM, in mm
Variable	Aquilion 64	Brilliance 64	LightSpeed 64	Sensation 64
In-plane	0.68	0.52	0.68	0.48
Longitudinal	0.81	0.84	0.98	0.70
Ratio in-plane/longitudinal	0.84	0.62	0.69	0.69