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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Vabim vas na 22. predavanje iz sklopa "Kolokviji na IJS" v
letu 2007/08, ki bo <strong><b><font color=red face="Times New Roman"><span
style='color:red'>v sredo, 18. junija 2008, ob 13:00 uri </span></font></b></strong><font
color=red><span style='color:red'>v Veliki predavalnici Instituta »Jožef
Stefan«</span></font> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja
najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>,
posnetke preteklih predavanj<font color=blue><span style='color:blue'> </span></font>pa
na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.
<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>prof. dr. Martin Frenz <o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span lang=FR
style='font-size:12.0pt;font-style:italic'>Institute of Applied Physics,
University of Bern, Switzerland<o:p></o:p></span></font></i></p>
<p><b><font size=4 face="Times New Roman"><span lang=EN-US style='font-size:
14.0pt;font-weight:bold'>Optoakustična tomografija, obetavna tehnika za
neinvazivno diagnosticiranje raka<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
text-align:justify;text-justify:inter-ideograph'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Z združitvijo kvalitet
optičnih in ultrazvočnih metod omogoča opto¬akustika velik optični kontrast
brez upada prostorske ločljivosti v optično sipajočih bioloških tkivih. V
biomedicinski optoakustiki obsevamo tkivo s kratkimi sunki laserske svetlobe.
Kljub sipanju vpadle svetlobe se selektivno segrejejo le absorbirajoče
strukture v notranjosti organa (npr. krvne žile). Kontrast v sliki tako
zagotavljajo velike razlike v absorpcijskih lastnostih tkivnih kromoforov,
bodisi endogenih (npr. oksi- in deoksihemoglobin) ali vnešenih od zunaj
(barvila, nanodelci ali kvantne pike). Hitro nehomogeno gretje snovi povzroči
nastanek tlačnih valov (termo-elastični pojav), ki jih zaznamo s primernim
ultrazvočnim detektorjem na površini vzorca. Pri enodimenzionalnih
optoakustičnih meritvah so amplituda in oblika vala ter časovni zamik med
laserskim obsevanjem in njegovo zaznavo povezani z močjo, dimenzijo ter globino
akustičnega izvora. S sistematičnim premikanjem detektorja (skeniranjem) lahko
iz meritev rekonstruiramo tri-dimenzionalno sliko podpovršinskih struktur. V
predavanju bo podan pregled zmožnosti in omejitev optoakustičnega slikanja v
bioloških tkivih, predvsem z vidika kontrasta in prostorske ločljivosti. <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
text-align:justify;text-justify:inter-ideograph'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Predavanje bo v
angleščini.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><b><font
size=3 color=red face=Calibri><span style='font-size:12.0pt;font-family:Calibri;
color:red'>Lepo vabljeni!</span></font></b></strong><strong><b><font
face="Times New Roman"><span style='font-weight:normal'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal align=center style='text-align:center'><b><font size=5
face="Times New Roman"><span style='font-size:18.0pt;font-weight:bold'>***<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>We
would like to invite you to 22<sup>nd</sup> lecture of the "Kolokvij na
IJS" in the school year 2007/08. The lecture will be held <b><span
style='font-weight:bold'>on Wednesday, June 18, 2008, at 1 pm</span></b> at <b><span
style='font-weight:bold'>JSI main lecture hall</span></b>, Jamova 39, <st1:place
w:st="on"><st1:City w:st="on">Ljubljana</st1:City></st1:place>. The abstract of
the lecture can be found on website: </span></font><font size=2><span
lang=EN-US style='font-size:10.0pt'><a
href="http://www.ijs.si/ijsw/Koledar_prireditev"><font size=3><span
style='font-size:12.0pt'>http://www.ijs.si/ijsw/Koledar_prireditev</span></font></a></span></font><span
lang=EN-US>, the previous recorded lectures can be found on website: </span><font
size=2><span lang=EN-US style='font-size:10.0pt'><a
href="http://videolectures.net/kolokviji_ijs"><font size=3><span
style='font-size:12.0pt'>http://videolectures.net/kolokviji_ijs</span></font></a></span></font><span
lang=EN-US>.</span><font size=2><span lang=EN-US style='font-size:10.0pt'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>********************************************<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt;font-weight:bold'>prof. dr. Martin Frenz <o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt;font-style:italic'>Institute of Applied Physics, <st1:place
w:st="on"><st1:City w:st="on">University of Bern</st1:City>, <st1:country-region
w:st="on">Switzerland</st1:country-region></st1:place><o:p></o:p></span></font></i></p>
<p style='text-align:justify;text-justify:inter-ideograph'><b><font size=4
face="Times New Roman"><span lang=EN-US style='font-size:14.0pt;font-weight:
bold'>Optoacoustic imaging, a promising technique for non-invasive diagnosis of
cancer<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Optoacoustics
provides high optical contrast without the handicap of poor resolution in
imaging of optically turbid tissues. In biomedical optoacoustics, tissue is
illuminated with short laser pulses. The light is scattered inside the tissue
and heats absorbing structures, such as blood vessels, hidden deeply inside the
tissue. Image contrast is therefore provided by light absorbing chromophores,
either endogenous (such as oxy- or deoxyhemoglobin) or exogenous (e.g. dyes,
nanoparticles or quantum dots). By means of the thermoelastic effect, the
inhomogeneous heating generates pressure transients exactly representing the
absorbing structures. These acoustic transients propagate to the tissue surface
and can be detected with an appropriate ultrasound transducer. In
one-dimensional optoacoustic measurements, time delay between the laser pulse
and detected pressure transient, its amplitude and temporal profile provide
information about the location, strength and spatial dimension of the acoustic
source. Three-dimensional images can be reconstructed by scanning the
transducer. The image quality depends on a number of factors, including the
irradiation geometry and image reconstruction algorithm. The talk will give an
overview of the possibilities and limitations of optoacoustic imaging in turbid
tissues, especially in terms of image contrast and depth resolution. </span></font><span
lang=EN-US>The lecture will be given in English.<o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span lang=EN-US
style='font-size:14.0pt;font-weight:bold'>We look forward to meeting you at the
Kolokvij na IJS!<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
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