Transcript Slayt 1

NİLGÜL NALBANT
Coordinator of Seminar : Mersini Makropoulou
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Laser – Tissue
Interactions
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CONTENT:
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What is the CARDIOLOGY?
CARDIOLOGY is a science which
researches anatomy, physiology and
pathology of the heart and the vessels.
 Disturbances in the heart and vessels are
diagnosed and treated by CARDIOLOGY.
 All important diseases are defined by
CARDIOLOGY.

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Laser Angioplasty
Laser Angioplasty is one of the
methods which is used for
defining the injuries.
 At the Laser Angioplasty, light
energy is transferred to the
tissue.

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The transfer of the light energy
into a tissue depends on three
factors:
 The wavelength of the light
 Its power density
 The chemical and physical
properties of the target
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Photon energy in electron-volts of some lasers currently
in use or under investigation for medical applications.
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
The absorption of the laser radiation by the
tissue is given by the equation:
I* = I
e-αL
I* = Intensity of the light transmitted
I= Intensity of the light beam
α= absorptivity of the target tissue
L= thickness of the tissue
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If the absorption is strong, the photons
penetrate to depth of only 1/10th to
1/100th of a mm from the tissue surface.
 Strong absorption tends to minimize the
thermal damage to the underlying areas
because the diffusion of heat from the
laser photons is minimized.

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The density of the photon stream or
power density is one of two factors that
control the density of excited molecules
in the tissue the instant the light beam
strikes.
 At the power levels at which lasers
operate, the laser- tissue interaction is
by no means limited to given molecule’s
being excited by just one photon.

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photoabsorption
POWER DENSITY
Photo ablation
Vaporization
coagulation
Photochemical
reactions
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Time(sn)
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This is explain by:

Fluence = Energy deposited/ area

Power density = Energy deposited / time

Power density = Fluence / time
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The overall process of using the photon energy of
pulsed laser to cause a transformation in a
tissue can be sorted into three individual step:
Absorption of the photon
2. Bond breaking
3. Ablation of the products
1.
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Laser
Beam
Mask
Irradiation
Tissue
Absorption
Long- chain
Molecules
Bond
Breaking
Ablation
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What are advantages of The
Laser in the Angioplasty?
1)It differentiates the damaged
vessel from the normal vessels.
2)It is used at the tissue
catheterization.
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ANGIOPLASTY
KOCAELİÜNİVERSİTESİTIP F. –CARDIOLOGY LABORATORY
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ANGIOPLASTY
KOCAELİÜNİVERSİTESİTIP F. –CARDIOLOGY LABORATORY
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Anatomic appearance
Angiographical appearance
Narrowed artery
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
THE ROLE OF ULTRASOUND IN THE INTERVENTIONAL CARDIOLOGY Dr.Cevdet
ERDÖL, Doc.Dr.Nazim A R S L A N , Prof.Dr.Dcnlz DEMlRKAN GATA Cardiology ABD,
ANKARA
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