scanner origin werner gellermann, ph.d. research professor department of physics, university of utah
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Scanner Origin
Werner Gellermann, Ph.D.
Research Professor
Department of Physics, University of Utah
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Center for Biomedical Optics
Dixon Laser Institute, University of Utah
Novel Raman Spectroscopy and Raman ImagingNovel, high-brightness blue-green light sourcesNovel light source for PDTExisting laser technologies
FundingNational Institutes of Health,State of UtahSpectrotek, LLC
TechnologiesPersonnelWerner Gellermann, Ph.D.Igor Ermakov, Ph.D.Robert McClaneMaia ErmakovaSteven WintchTige CookLihong JinMohsen Sharifzadeh
Paul Bernstein, Ph.D, M.D.Da-You Zhao, M.D.Prakash Bohsale
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Biophotonics
• Bio = Living Organism
• Photon = Light
• Biophotonics = Measuring living organisms with light
• The future of health tests
– blood sugar
– bilirubin
– antioxidant defense
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Vibronic Energy Levels
Laser light
Raman scattered light
Raman ScatteringSir C. V. Raman, Nobel Prize in Physics
1930
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Raman spectrum of carotenoids
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Raman measurements of lutein and zeaxanthin in the living human retina
Raman Instrument
Healthy retina
Age (years)
20 30 40 50 60 70 80 90
Co
un
ts (
me
an
+ S
D)
-500
0
500
1000
1500
2000
2500
3000
Raman results:
Decline of carotenoids with age
Vision with AMD
Normal vision
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Measuring Skin Carotenoid LevelsExposure time ……………. 20 sec
Laser …………….488 nm; 5 mW
Laser light spot diameter …. 2 mm
Intensity at skin …. 0.16 W/cm2
Radiant exposure about 1500 times lower that AINSI safety limit
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Raman measurements of group of 1266 subjects
Mean: 19,281Std.Dev.: 8,769N = 1,266
Num
ber
of S
ubje
cts
Skin carotenoid Raman signal, a.u.
Feasible to assess carotenoid content in large numbers of subjects; field studies
Study correlation between disease and tissue carotenoid antioxidant levels
Study bioavailability, uptakes, correlation with blood levels, etc.
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Future• Use portable Raman carotenoid scanner in epidemiological
and clinial studies to determine correlation between carotenoid levels in tissue and risk for diseases.
• Novel, noninvasive biomarker for fruit and vegetable uptake (NIH grant for collaboration between University of Utah and Yale University; start date: Spring 2003; contact Pharmanex for Details)
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