Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab 1 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier Engineering and Information Technology Bern University of Applied Sciences SLN Seminar, EPMT Lausanne, 26. May. 2011 Ch. Meier www.OptoLab.ch Optical Coherence Tomography OCT 3D Imaging in Medical Technology and Quality Control
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Optical Coherence Tomography OCT 3D Imaging in Medical ...€¦ · OCT Basics Time Domain TD-OCT, ... •UST Ultra Sound Tomography ... Output Power 20 mW Sweep Rate 50 kHz Coherence
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Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
1 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
SLN Seminar, EPMT Lausanne, 26. May. 2011
Ch. Meier
www.OptoLab.ch
Optical Coherence Tomography OCT
3D Imaging in Medical Technology and Quality Control
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
2 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Outline
1. Introduction
2. OCT BasicsTime Domain TD-OCT, Frequency Domain FD-OCT, Full Field OCT
3. OCT: Medical Applications
4. OCT: Industrial Applications
5. Some Projects @ OptoLab, BFH-TI, Biel-Bienne
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
3 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Tomographic Methods in Medical Engineering
Tomography = 3D image by sections
Greek word tomos = slice, section
• CT X-ray
• MRI Magnetic Resonance Imaging
• PET Positron Emission Tomography
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
4 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Tomographic Methods in Medical Engineering
• UST Ultra Sound Tomography
• ODT Optical Diffusion Tomography
• PAT Photoacoustic Tomography
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
5 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Tomographic Methods in Medical Engineering
• Confocal Microscopy
• OCT Optical Coherence Tomography
Drexler W., Fujimoto J. Science Direct 2007
Stained mitochondrial network
Olypus Microscopy
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
6 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
MRI, PET
CT
Name Speed Hazard
CT - +++
MRI - -
PET - +++
UST ++ -
DOT - -
PAT + -
OCT +++ -
Tomographic Methods in Medical Engineering
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
7 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
• A-scan: Depth profile of backscattered or back reflected light
• B-scan: Cross section obtained by scanning in x direction
• C-scan: 3D image.
• Similar to ultrasonic time of flight measurements
• Interferometric measurement technique
3D Imaging by scanning OCT
Source
S(λ)
Spectrometer
z
0
A-scan, spatial domain
B-scan
0 100 200 300 400 5000
2000
4000
6000
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
8 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
OCT: wavelength range
Hemoglobin and water have low absorption in near infrared
Diagnostic window
Commonly used
wavelengths:
• 840nm
• 1060nm
• 1310 nm
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
9 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Basic principle: Time Domain OCT
Michelson Interferometer setup with
moving reference mirror
The signal envelope represent
the reflectivity depth profile
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
10 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
FD-OCT, basic principle
Swept
Source
z
z0
z1
Detector
Source
S(λ)
z
z0
z1
SpectrometerSpectrometer
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
11 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Resolution: OCT and Microscopy
Lateral resolution Axial resolution
Confocal
Microscope
OCT
Coherence gate
z
0
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
12 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
FD OCT
TD OCT Source
S(λ)
Cam
Swept
Source
Cam
z
SLED
z
0
SS
Detector
z
0
Full Field OCTScanning OCT
SLED
z
0
Detector
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
13 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
State of the art, retina imaging
From OptoPol, soct_HR
From Zeiss cyrrus
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
14 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
State of the art, retina imaging
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
15 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Anterior segment of the eye
Woitkowsky, AVRO 2011
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
16 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Endoscopic OCT and cardiology
From LightLab
Kume, Assessment of corocary
calcification by OCT, PCR online 2010
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
17 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
Functional OCT, Doppler
Bachmann,…Leitgeb. OpticExpress,. 2007
Leitgeb in Optical Cherence Tomography, Springer 2008
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
18 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology
Bern University of Applied Sciences
White Light Interferometry (Full Field time domain OCT)
• Different Microscope manufactererprovide such systems.
• Z-Resolution some nm
• Slow scanning motion
• Problem: mechanical vibration
S
Technik und Informatik / Mikrotechnik und Medizintechnik / OptoLab
19 / 27 SLN/EPMT, Lausanne, 26.5.2011 Ch. Meier
Technik und Informatik Engineering and Information Technology