Method and device for determining a minimum value of laser energy necessary for the formation of a gas bubble
AssigneeKeranova
InventorsAurelien BERNARD, Emmanuel BAUBEAU
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Abstract
The invention concerns a method for determining a minimum value of L.A.S.E.R. energy necessary to form, by using a LASER source, a gas bubble in an ocular tissue, the method comprising: acquisition (200) of a reference image, emission (210) at a sampling point, of a L.A.S.E.R. beam, acquisition (220) of one (or more) current image(s) of the ocular tissue, detection (230) of one (or more) gas bubble(s) by comparing the current image(s) and the reference image, determination (240, 250) of the minimum value based on the detected gas bubble(s).
Claims16
A determination method for determining a minimum value of L.A.S.E.R. energy necessary to form, by using a cutting apparatus including a femtosecond L.A.S.E.R. source, a gas bubble in at least one elementary area extending in a cutting plane of an ocular tissue, characterized in that wherein the method comprises the following steps:
- a) Receiving by a data processing unit of a reference image of the ocular tissue, said reference image having been acquired by an imaging system prior to the emission of a plurality of L.A.S.E.R. beams able to focus at least at one sampling point of each elementary area, each L.A.S.E.R. beam having a respective energy different from the other L.A.S.E.R. beams of the plurality of L.A.S.E.R. beams,
- b) Receiving by the data processing unit of at least one current image of the ocular tissue, each current image having been acquired by the imaging system subsequently to the emission of at least one L.A.S.E.R. beam of the plurality of L.A.S.E.R. beams,
- then for each elementary area, implementing the following steps by the data processing unit:
- c) Detecting by comparing the reference image with each current image, of at least one gas bubble formed in the elementary area, each gas bubble being associated with a respective L.A.S.E.R. beam,
- d) Determining based on the at least one detected gas bubble, of a minimum value of energy necessary for the formation of a gas bubble in the elementary area.
A determination device for determining a minimum value of L.A.S.E.R. energy necessary to form, by using a cutting apparatus including a femtosecond L.A.S.E.R. source, a gas bubble in at least one elementary area extending in a cutting plane of an ocular tissue, the determination device including an imaging system for the acquisition of images, wherein the determination device further comprises a data processing unit including means for:
- a) Receiving a reference image of the ocular tissue, said reference image having been acquired by the imaging system prior to the emission of a plurality of L.A.S.E.R. beams able to focus at least at one sampling point of each elementary area, each L.A.S.E.R. beam having a respective energy different from the other L.A.S.E.R. beams of the plurality,
- b) Receiving at least one current image of the ocular tissue, each current image having been acquired by the imaging system subsequently to the emission of at least one L.A.S.E.R. beam of the plurality of L.A.S.E.R. beams,
- then for each elementary area:
- c) Detecting by comparing the reference image with each current image, at least one gas bubble formed in the elementary area, each gas bubble being associated with a respective L.A.S.E.R. beam,
- d) Determining, based on the at least one gas bubble, a minimum value of energy necessary for the formation of a gas bubble in the elementary area.
Dependencies are inferred from the claim text.