公开(公告)号：US12070269B2

公开(公告)日：2024-08-27

申请号：US17532501

申请日：2021-11-22

Applicant: OPTOS PLC

Inventor： Miguel Angel Preciado ,  Lijo Varughese Chacko

IPC: A61B3/10 ,  G01B9/02091

CPC classification number: A61B3/102 ,  G01B9/02091

Abstract: An optical coherence tomography instrument suitable for imaging a retina is disclosed. In the instrument, an adjustable optical frequency shifter, which can be or include an acousto-optic modulator or electro-optic modulator, is arranged either (i) between a coupler and a reference optical system, (ii) in a reference optical system, (iii) between the coupler and a front-end optical system, or (iv) in a front-end optical system. The optical frequency of reference light or signal light may adjustably be increased or decreased. In operation, a subject is arranged such that its retina is in the focal depth of the front-end optical system. The increase or decrease in the optical frequency of the reference light or the sample light can be adjusted. Thereby, an interferogram representing a depth structure at the retina obtained between returning signal light and returning reference light may be brought to lie within a detection bandwidth of the instrument.

公开(公告)号：US20220218196A1

公开(公告)日：2022-07-14

申请号：US17532501

申请日：2021-11-22

Applicant: OPTOS PLC

Inventor： Miguel Angel Preciado ,  Lijo Varughese Chacko

IPC: A61B3/10 ,  G01B9/02

Abstract: An optical coherence tomography instrument suitable for imaging a retina is disclosed. In the instrument, an adjustable optical frequency shifter, which can be or include an acousto-optic modulator or electro-optic modulator, is arranged either (i) between a coupler and a reference optical system, (ii) in a reference optical system, (iii) between the coupler and a front-end optical system, or (iv) in a front-end optical system. The optical frequency of reference light or signal light may adjustably be increased or decreased. In operation, a subject is arranged such that its retina is in the focal depth of the front-end optical system. The increase or decrease in the optical frequency of the reference light or the sample light can be adjusted. Thereby, an interferogram representing a depth structure at the retina obtained between returning signal light and returning reference light may be brought to lie within a detection bandwidth of the instrument.

公开(公告)号：US20220015624A1

公开(公告)日：2022-01-20

申请号：US17339980

申请日：2021-06-05

Applicant: OPTOS PLC

Inventor： Lijo Varughese Chacko ,  Margaret Catherine Normand

IPC: A61B3/10 ,  G01B9/02 ,  A61B3/00

Abstract: A binocular OCT imaging system for simultaneously imaging regions of a first eye and second eye using an interferometer having a reference arm first sample arm and second sample arm, by: obtaining an electrical signal (S) having first frequency components spanning a first band and caused by interference between reference light in the reference arm with light reflected from the first eye in the first sample arm, and second frequency components spanning a second band and caused by interference between the reference light and light reflected from the second eye in the second sample arm; and generating OCT images of: the region of the first eye using first frequency components in a portion of the first band not overlapping the second band; and the region of the second eye using second frequency components in a portion of the second band not overlapping the first band.

公开(公告)号：US20210348912A1

公开(公告)日：2021-11-11

申请号：US17233672

申请日：2021-04-19

Applicant: OPTOS PLC

Inventor： Miguel Angel Preciado ,  Lijo Varughese Chacko

IPC: G01B9/02 ,  A61B3/10 ,  G01N21/47

Abstract: A swept-source OCT imaging system for imaging a region of an object, comprising: a swept light source which generates a beam of varying wavelength; a scanning element which scans the beam across the object; an interferometer which generates interference light by combining light scattered by the object (owing to the scan) with reference light; a photodetector which generates an electrical signal (S) having frequency components spanning a frequency band and caused by interference of the scattered light with the reference light; a band-pass filter module which band-pass filters the electrical signal; and a sample acquisition module which samples the filtered electrical signal. The band-pass filter module extracts at least some of the frequency components spanning the frequency band from the electrical signal. The sample acquisition module band-pass samples the filtered electrical signal.