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Field size at depth
s(d) = 11.00 cm
s
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d
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s
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S
S
D
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d
S
S
D
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s
i
s
o
S
A
D
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d
−
S
A
D
i
s
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A
D
s(d)=s_0\frac{\mathrm{SSD}+d}{\mathrm{SSD}}=s_{\mathrm{iso}}\frac{\mathrm{SAD}+d-\mathrm{SAD}_{\mathrm{iso}}}{\mathrm{SAD}}
s
(
d
)
=
s
0
SSD
SSD
+
d
=
s
iso
SAD
SAD
+
d
−
SAD
iso
Geometric projection of a surface field to depth d.
Laser