Table: 1.

Description of QLF-parameter terminologies

	Terminology	Definition
1	Delta R (ΔR ) $\Delta {\mathrm{R}}_{\text{Pixel}}\cong \frac{{(\mathrm{R}∕\mathrm{G})}_{\text{lesion}-}{(\mathrm{R}∕\mathrm{G})}_{\text{sound}}\times 100\%}{{(\mathrm{R}∕\mathrm{G})}_{\text{sound}}}$	Ratio of red over green in the area of interest compared to a sound area of the tooth. Expressed in percentage (%). ΔR is based on thresholds at ΔR0, ΔR10, ΔR20, ΔR30, ΔR40, ΔR50, ΔR60, ΔR70, ΔR80, ΔR90, ΔR100, ΔR110, ΔR120 and Total.
2	Area of red fluorescence (AΔR)	Area of ΔR equivalent or higher to a specific threshold at ΔR30, ΔR70, ΔR120
3	Plaque wizard patch	A rectangular contour which could be adjusted to any size, and shape. Here it was placed around the lesion area, in the sound area of the tooth.
4	Delta F(ΔF)	Average loss of green fluorescence in the carious surface compared to the green fluorescence in the sound tooth area. Expressed as percentage (%) and resembling, lesion depth.
5	Area of lesion (AΔF)	Area of the carious lesion surface expressed as px2 equivalent to a threshold specific at ΔF.
6	Delta Q(ΔQ )	Percentage of green fluorescence loss (ΔF) times the area of the lesion (A). It is expressed as %px2 resembling, lesion volume.