Clinical Guide
Smart532
™
A-24 UM-1151440EN, Rev. C, May 2016
Fluence is the measurement of energy delivered in relation to the area of
the treatment beam or energy density. Irradiance is the measurement of
power delivered in relation to the area of the treatment beam or power
density. This measurement is helpful in determining the power setting to
use for a particular treatment. Fluence and irradiance for various power
and duration settings can be calculated using the following equations:
E = P T
S
2
2
Where:
F = Fluence (J/cm
2
) T
S
= Pulse duration (sec)
I = Irradiance (W/cm
2
) A = Spot area (cm
2
)
E = Energy (J) d = Spot diameter (cm)
P = Power (W)
Table A-3 lists resulting spot sizes using approximate irradiance and
fluence for a delivery power of 1 W, pulse durations of 0.5 s and 1.0 sec,
and a fiber diameter of 300 or 600 µm.
Table A-3: Irradiance and Fluence at 1 W and 0.5 Sec and 1.0 Sec Delivered
Fiber Diameter
(µm)
Spot Size
(mm)
Spot Size
Area (cm
2
)
Irradiance
(W/cm
2
)
Fluence at 1
Sec (J/cm
2
)
Fluence at 0.5
Sec (J/cm
2
)
300
0.3 0.000707 1415 1415 707
3.0 0.0707 14 14 7
600
0.6 0.00283 354 354 177
3.0 0.0707 14 14 7
energy delivered
by endoprobe
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