gh.naderian, md. the eye has two separate and distinct circulatory systems, the retinal and the...
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Imaging of Ocular Blood FlowGh.Naderian , MD
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The eye has two separate
and distinct circulatory
systems , the retinal and the
uveal.
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The retinal vascular
system nourishes the inner
retina.
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The uveal system supplies
the choroid , ciliary body and
iris.
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Color Doppler imaging:Color Doppler imaging (CDI) is an
ultrasound technique combining B-
Scan gray scale imaging and blood
velocity measurements
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CDI can be used to calculate peak
systolic velocities (PSVs) and end-
diastolic velocities (EDVs) in the
retrobulbar vessels , including the
OA,CRA and nasal and temporal
PCAs.
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Canon laser Blood Flowmeter
The canon laser blood flowmeter
(CLBF) is a recently developed
device used to simultaneously
quantify the velocity of blood within
large retinal vessels and their
diameter.
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Use of CLBF is limited by its
calculated flow assumptions ,
cataract , vitreous opacties ,
small pupills and eye movement.
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Heidelberg Laser Doppler Flowmetry
The confocal scanning laser doppler
flowmeter , also known as the
Heidelberg retina fowmeler (HRF) ,
combines a laser doppler flowmeter
with a confocal scanning laser
tomograph.
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Scanning Laser Ophthalmoscope Angiography
FA and ICG angiography
performed with a scanning lascr
opthalmoseope (SLO) can be
used to quantitate blood flow.
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In SLO angiography fluorescein dye
may be used to evaluale the retinal
vasculature to yield homodynamic
measurements such as arteriovenous
passage (AVP) and meam dye velocity
(MDV)
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Pulsatile Ocular Blood Flow Measurement
Pulsatile ocular blood flow
(POBF) devices consist of a
modifed Pneumotonometer
interfaced with a microcomputer
that records the ocular pulse.
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POFB monitors the rhytmic
change in intraocular
pressure (IOP) during the
cardiac cycle,which fluctuates
up to 2mm Hg in sinusoidal
fashion
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Clinical Applications1) Glaucomatous optic
Neuropathy
2) Diabetic Retinopathy
3) Age-related Macular
degeneration