Device and method for controlling a laser therapy of the eye
A device for controlling a laser therapy of the eye, including an evaluation unit that determines an intensity of a transient temperature effect by analysis of interferometric signals obtained from the eye and a control unit that controls the laser therapy, which is based on said transient temperature effect, the control unit being connected with said evaluation unit. A method for controlling a laser therapy of the eye, includes determination of the intensity of a transient temperature effect that is utilized for the control of the laser therapy, based on the effect, by analysis of interferometric signals.
1. A device for controlling laser therapy of an eye, comprising:
an evaluation unit that determines an intensity of a transient temperature effect in the eye by analysis of interferometric signals obtained from the eye; and
a control unit that controls a laser that applies the laser therapy, which is based on said transient temperature effect, the control unit being operably connected with said evaluation unit;
an OCT and wherein said interferometric signals are OCT signals, and further wherein the analysis comprises Doppler analysis (DOCT);
wherein the evaluation unit is configured to determine a temperature distribution according to the following relationship:
T
(
x
,
y
,
z
,
t
)
=
α
Ω
(
x
,
y
,
z
,
t
)
·
3
η
a
λ
0
2
16
π
k
b
wherein Ω is the Doppler frequency spread determined by DOCT; wherein k b is the Boltzmann constant; wherein η is a dynamic viscosity of a medium; wherein a is a particle diameter; wherein λ 0 is an OCT spectral centroid; and wherein α is a material characteristic.
2. The device, according to claim 1 , wherein the control unit that controls the laser therapy is configured such that tissue with defined OCT characteristics is automatically included in or excluded from the laser therapy.
3. A computer implemented method of creating a three-dimensional, ophthalmological thermography, comprising:
determining a Doppler broadening distribution Ω(x,y,z,t) by use of a Doppler OCT (DOCT); and
determining a temperature distribution from the Doppler broadening distribution to create the thermography by use of a computer controller;
determining the temperature distribution according to the following relationship:
T
(
x
,
y
,
z
,
t
)
=
α
Ω
(
x
,
y
,
z
,
t
)
·
3
η
a
λ
0
2
16
π
k
b
wherein Ω is the Doppler frequency spread determined by DOCT; wherein k b is the Boltzmann constant; wherein η is a dynamic viscosity of a medium; wherein a is a particle diameter; wherein λ 0 is an OCT spectral centroid; and wherein α is a material characteristic.
4. The method, according to claim 3 , further comprising determining the ophthalmological thermography on a time resolved basis.
5. A computer implemented method of controlling a laser therapy of the eye, comprising:
using a temperature distribution T to control a laser applying the laser therapy; and
determining the temperature distribution T using the following relationship
T
(
x
,
y
,
z
,
t
)
=
α
Ω
(
x
,
y
,
z
,
t
)
·
3
η
a
λ
0
2
16
π
k
b
wherein Ω is the Doppler frequency spread determined by DOCT; wherein k b is the Boltzmann constant; wherein η is a dynamic viscosity of a medium; wherein a is a particle diameter; wherein λ 0 is an OCT spectral centroid; and wherein α is a material characteristic.