Table 1.

Optical throughput and intensity calibration of the fluorescence lifetime imaging (FLIm) system.

Channel specifications (Center/BW, nm)	Measured spectral widths (nm)a	Measured average transmittance	MCP spectral sensitivity ($\mathrm{mA}/\mathrm{W}$)b	Intensity calibration factors
$390/40$	35.5	51.4%	45.07	0.94
$452/45$	52.4	55.3%	45.60	1
$542/50$	55.9	60.3%	32.19	0.77
$629/53$	58.3	60.0%	21.91	0.52

^aFull width at half maximum (FWHM) of the transmittance spectrum is used to determine the spectral widths.

^bMCP cathode sensitivity at the center wavelength of the channel measured by the manufacturer.