FOURIER DOMAIN OPTICAL COHERENCE TOMOGRAPHY IN THE MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVE...
Download
1 / 38

OLUFEMI ODERINLO FRCSEd FWACS DRCOphth Consultant Ophthalmologist and Vitreoretina Surgeon - PowerPoint PPT Presentation


  • 71 Views
  • Uploaded on

FOURIER DOMAIN OPTICAL COHERENCE TOMOGRAPHY IN THE MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES. OLUFEMI ODERINLO FRCSEd FWACS DRCOphth Consultant Ophthalmologist and Vitreoretina Surgeon EYE FOUNDATION HOSPITAL GROUP. INTRODUCTION.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' OLUFEMI ODERINLO FRCSEd FWACS DRCOphth Consultant Ophthalmologist and Vitreoretina Surgeon ' - fritz-wells


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

FOURIER DOMAIN OPTICAL COHERENCE TOMOGRAPHY IN THE MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

OLUFEMI ODERINLO FRCSEd FWACS DRCOphth

Consultant Ophthalmologist and Vitreoretina Surgeon

EYE FOUNDATION HOSPITAL GROUP


Introduction
INTRODUCTION MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • There are two principles of image acquisition and data processing in OCT:

  • Time domain and Fourier domain algorithms.

  • In time domain OCT, there is a mechanical moving part that performs the A-scan, and the information along the longitudinal direction is accumulated over the course of the longitudinal scan time. Thus, the rate of the scan is limited by the movement of the part.


  • In MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIESFourier domain OCT, the information in an entire A-scan is acquired by a charge-coupled device (CCD) camera simultaneously.

  • The A-scan acquisition rate is limited by the CCD camera frame transfer rate and the computer calculation time to perform the Fourier transform of the CCD acquired raw data into A scan information.

  • As there is no mechanical movement, the scan time in Fourier domain OCT is faster. This is an important advancement because faster acquisition time means lesser variability in the result due to the patient’s eye movements. This device has a higher resolution than time domain OCT.


Optovue
OPTOVUE MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • The Fourier domain OCT, RTVue has been approved by the U.S. Food and Drug Administration.

  • It takes 26,000 A-scans per second, with a frame rate of 256 to 4,096 A-scans per frame. It has a depth resolution of 5 μm and a transverse resolution of 15 μm.

  • The scan range is 2 mm to 2.3 mm in depth and 2 mm to 12 mm in transverse direction. The scan beam wavelength is 840 ± 10 nm, and the exposure power at the pupil is 750 μW.



Case 1
CASE 1 MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • 36 year old security guard referred for macula hole surgery OD.

  • In good general health.

  • VA 6/12 OD , 6/5 OS

  • Normal anterior segments, pupillary reaction and IOP.

  • Fundus OS normal


Pseudohole
PSEUDOHOLE MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • Idiopathic Serous Retinal Pigment Epithelial Detachment.

  • Seen in patients much younger than ARMD definition.

  • Few case reports mostly males 20 – 45 years


Pathophysiology
Pathophysiology MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • a non-specific anatomical alteration that may result from any number of choroidal disorders that disrupt the normal junction between the basement membrane of the RPE and the inner collagenous layer of Bruch’s membrane.

  • Idiopathic cases are sometimes associated with ICSC; some believe these two conditions to represent a continuum of a similar underlying pathology.

  • Uncomplicated idiopathic serous detachments of the RPE often resolve spontaneously, however, those associated with more generalized damage to the choriocapillaris may be complicated by hemorrhage, choroidalneovascular membrane formation, and disciform scarring.


Morphology to the fundus photo a hole is a hole
MORPHOLOGY: to the MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIESfundus photo a hole is a hole


Hole morphology
HOLE MORPHOLOGY MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES


Measurements
MEASUREMENTS MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

(a) base diameter,

(b) minimum linear dimension

(c) and (d) arms for measuring hole form factor

(e) hole height

(f) macular hole inner opening.

Hole form factor ¼ (c+d)/a; Macular hole index ¼ e/a; Tractionalhole index ¼ e/b.


Stage
stage MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES

  • Modified Gass classification system of macular holes.

  • Stage

  • Description

  • Stage 1a

  • Yellow spot with loss of foveal depression, no vitreous separation

  • Stage 1b

  • Yellow ring with loss of foveal depression, no vitreous separation

  • Stage 2

  • Small full-thickness macular hole < 400 microns

  • Stage 3

  • Full-thickness macular hole > 400 microns, no vitreous separation

  • Stage 4

  • Full-thickness macular hole > 400 microns, complete vitreous separation


HFF MANAGEMENT OF POSTERIOR SEGMENT DISORDERS: A REVEALING CASE SERIES



GCC closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


Hole closure type
Hole closure type closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

  • Closed macular holes are categorised into two patterns based on OCT;

  • type 1 closure (closed without fovealneurosensory retinal defect)

  • type 2 closure (closed with fovealneurosensory retinal defect).


Case 2
CASE 2 closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

  • 49 year old diabetic with PDR who has had extensive PRP laser.


Cme vmt
CME/VMT closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


  • Reason for poor vision in closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%. heriditary disorders


Case 3
CASE 3 closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

14 year old girl with nyctalopia and difficulty with reading

Suspicious macula, more of an atrophic picture.


Fundus
Fundus closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


FFA closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


Definite cme on fd oct
Definite CME on FD OCT closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


FFM closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


Fd oct
FD OCT closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.



Case 4
CASE 4 closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

  • 41 year old phakicmyope with a 5 day history of an inferior retinal detachment OS.

  • Round hole at 6 o ‘clock with foveal affectation


  • Had closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%. scleral buckle with drainage of subretinal fluid.

  • Retina reattached

  • Vision improved from 6/60 to 6/18, significant improvement in CVF


Fd oct1
FD OCT closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

  • Non reflective subfoveal cavity representing subfoveal SRF.


Case 5
CASE 5 closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


Fd oct2
FD-OCT closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


Fd oct classification for cnv
Fd closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%. -OCT CLASSIFICATION FOR CNV

  • Type 1> 90% sub-RPE.

  • Type 2 > 90% sub-retinal.

  • * Minor type 1 component (10% lesion) visualized.

  • † Fibrovascular PED.

  • ‡ Minor type 2 component (10% lesion) visualized.

  • Combined

  • Indeterminate


  • showing a mostly closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%. subretinal growth pattern of CNVM in an eye with a minimally classic angiographic lesion composition.

  • the hyperreflective lesion (cnvm)is outlined in gray with the sub-RPE component of the lesion in a lighter shade.



Thank you

THANK YOU closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.


References
REFERENCES closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%.

  • Desai VN, Hee MR, Puliafito CA. Optical coherence tomography of macular holes. In: Madreperla SA, McCuen BW, eds. Macular hole: pathogenesis, diagnosis and treatment. Oxford: Butterworth-Heinemann 1999:37–47


ad