Page 1
Diffuse Optical Spectroscopy and Imaging
Laser Microbeam and Medical Program (LAMMP) Beckman Laser Institute and Medical Clinic
Departments of Biomedical Engineering and Surgery
University of California, Irvine http://www.bli.uci.edu
Bruce J. Tromberg
BLI
Computational Biophotonics Workshop: July 2017
Page 2
Disclosure
Co-founder:
Industry Collaboration:
Page 3
Medical Imaging
MR, X-ray, Nuclear, US (Optical)
Mainstream Modalities
Page 4
Where Does Biophotonics Fit In?
Masimo Pronto
Medtronic-Covidien Invos
Diagnostics
Imaging/spectroscopy
NOVADAQ Pinpoint
Heidelberg Engineering Spectralis
Perimed Periscan Pentax Endoscope
Syneron-Candela, Lumenis, Alma, Cutera, Cynosure, Fotona, Lutronic, etc
AMO Intralase FS
Therapeutics
Medical Lasers
Vioptix Odissey
~$80B/yr
St. Jude C7-XR
Page 5
Where Does Biophotonics Fit In?
Masimo Pronto
Medtronic-Covidien Invos
Diagnostics
Imaging/spectroscopy
NOVADAQ Pinpoint
Heidelberg Engineering Spectralis
Perimed Periscan Pentax Endoscope
Syneron-Candela, Lumenis, Alma, Cutera, Cynosure, Fotona, Lutronic, etc
AMO Intralase FS
Therapeutics
Medical Lasers
Vioptix Odissey
~$80B/yr
St. Jude C7-XR
Page 6
Where Does Biophotonics Fit In?
Masimo Pronto
Medtronic-Covidien Invos
Diagnostics
Imaging/spectroscopy
NOVADAQ Pinpoint
Heidelberg Engineering Spectralis
Perimed Periscan Pentax Endoscope
Syneron-Candela, Lumenis, Alma, Cutera, Cynosure, Fotona, Lutronic, etc
AMO Intralase FS
Therapeutics
Medical Lasers
Vioptix Odissey
~$80B/yr
St. Jude C7-XR
Page 7
Diffuse Optics • Multi-Spectral (NIR) • Structured Light: Space and Time • Optical Pathlength Control
Multiple Light Scattering
850 nm NIR LEDs
O'Sullivan TD, et al. J Biomed Opt. 17(7):071311 (2012).
Page 8
Tissue Optics Quantitative Challenge
Measuring Optical Pathlength
Molecular Absorption Loss
Absorption + Scattering Loss
A = εbC; b = 1cm
A = εbC; b = ??
Fixed pathlength
Unknown pathlength
Page 9
Why Measure Optical Pathlength?
• Determine Perfusion and Metabolism at depth (Oxy/Deoxy Hb) • Determine concentration of other NIR absorbers/fluors (e.g. Water,
Lipid, exogenous dyes/particles ) • Correct fluorescence for tissue optical property distortions
1) Separate Absorption from Scattering 2) Localize Information in 3D (Tomography)
Physics
Physiology
Page 10
Controlling Pathlength Three Ways to Control Pathlength
blue
green
red
Scatter Dominated
labs ~ lscat labs >> lscat
1) Wavelength:
Page 11
Controlling Pathlength
1) Wavelength: blue
green
red
100% StO2
50% StO2
Sensitive to small absorption changes
Three Ways to Control Pathlength
Page 12
400 labs ~ lscat labs >> lscat
Page 13
Controlling Pathlength
2) Space: labs ~ 10 cm; lscat ~ 20-40 µm;
D-1 D-2
2 10 20 mm
Reflectance vs D
µa = 0.01 mm-1
µs’ = 0.1 mm-1
Scatter dominated
Scatter + Absorption
Three Ways to Control Pathlength
Page 14
400 labs ~ lscat labs >> lscat
f = 0 mm-1 f = 0 mm-1
Page 15
400 labs ~ lscat labs >> lscat
f = 0 mm-1 f = 0.2 mm-1
Page 16
Controlling Pathlength
3) Time: τabs ~ 0.5 ns, τscat ~ 0.20 ps Intensity vs. Time (2 cm s-d)
Laser pulse
0.2 1.0 0.6 ns
T-1
T-2
Scatter dominated
Absorption dominated
Three Ways to Control Pathlength
2 cm s-d
Page 17
Measuring Optical Path Length
Page 18
Measuring Optical Path Length FT
(t)
FT-1
(ω)
FT(t)
FT-1
(ω)
Page 19
Measuring Optical Path Length FT
(t)
FT-1
(ω)
FT(t)
FT-1
(ω)
~10 cm depth, ~ cm resolution ~1 cm in depth, ~mm resolution
Tromberg, et al., Appl Opt., (1993) Cuccia et. al., Opt Lett, (2005)
Page 20
source detector (reflection)
scattering tissue
ρ
inte
nsity
time
source light
detected light
),( ωrΘ
),( ωrA
Temporal Frequency Domain Photon Migration (FDPM)
Page 21
Controlling Pathlength
),(),(),()(),( trStrtrrDt
trcn
a =+∇⋅∇−∂
∂φμφ
φ
Light source
Loss: Light Absorption (f/λ)
Build up: Light Scattering
)]'(3/[1 saD μμ += Photon Diffusion Coefficient
In Scatter-Dominated Region: Diffusion Equation
Light Tissue Distribution
Fluence rate: Space, time
1/labs 1/ltr T. O’Sullivan et al., JBO, 2012
Page 22
Diffusion equation (time dependent)
=−−=+−=Φ ])[exp()exp(4
)exp(4
),( rktirkDr
StikrDr
Srt imgrealACAC
AC ωπ
ωπ
frequency domain → scalar photon density wave
)exp()()(),( rate fluence modulated tirrrt ACDC ωΦ+Φ=Φ⇒
damped wavecDi
Dk a ωμ
+=2
Infinite medium:
Boundary Conditions: Haskell, Tromberg et al, JOSA-A (1994)
Page 23
0200400600800
10001200
0 0.02 0.04 0.06 0.08 0.1
k (1/mm)
Mod
ulat
ion
Freq
uenc
y (M
hz)
Photon density wave
kreal
μa = 0.006 mm-1
μs’ = 1 mm-1
n=1.4
photon density wavelength = 2π/kimg ≅ 10 cm @ 200 MHz
(if no scattering, in air ≅ 9 m @ 200 MHz )
phase velocity Vp = ω/kimg ={ ω << cμa ⇒ Vp = 2(D/cμa )1/2 ≈16 mm/ns ω >> cμa ⇒ Vp = (2Dωc)1/2
1/τl
δDC = 1/μeff = (D/μa)1/2 = 7.4 mm
kimag
0.05 0.1 0.15 0.2 0.25 cμa= 200 MHz
δAC = 1/kreal
(independent of ω)
(dependent on ω: dispersion)
Page 24
200 400 600 800 10000
1
2
3
4
5
x 10-4
Am
plitu
de (
a.u.
)
Frequency (MHz)
DataModel Fit
200 400 600 800 10000
50
100
150
200
250
300
Pha
se (
deg.
)Frequency (MHz)
DataModel Fit
Page 25
700 800 900 10000
0.005
0.01
0.015
0.02
Abs
orpt
ion
Coe
ffic
ient
(m
m-1
)Wavelength(nm)
FDPM
700 800 900 10000.6
0.7
0.8
0.9
1
Red
uced
Sca
tter
ing
Coe
ff.
(mm
-1)
Wavelength(nm)
FDPM
Page 26
700 800 900 10000
0.005
0.01
0.015
0.02
Abs
orpt
ion
Coe
ffic
ient
(m
m-1
)Wavelength(nm)
FDPM
700 800 900 10000.6
0.7
0.8
0.9
1
Red
uced
Sca
tter
ing
Coe
ff.
(mm
-1)
Wavelength(nm)
FDPMPower Law Fit
Page 27
700 800 900 10000.6
0.7
0.8
0.9
1
Red
uced
Sca
tter
ing
Coe
ff.
(mm
-1)
Wavelength(nm)
FDPMPower Law Fit
700 800 900 10000
0.005
0.01
0.015
0.02
Abs
orpt
ion
Coe
ffic
ient
(m
m-1
)Wavelength(nm)
FDPM
700 800 900 10000
0.2
0.4
0.6
0.8
1
1.2R
efle
ctan
ce (
a.u.
)
Wavelength(nm)
Page 28
700 800 900 10000
0.005
0.01
0.015
0.02
Abs
orpt
ion
Coe
ffic
ient
(m
m-1
)Wavelength(nm)
FDPMSSFDPM
700 800 900 10000.6
0.7
0.8
0.9
1
Red
uced
Sca
tter
ing
Coe
ff.
(mm
-1)
Wavelength(nm)
FDPMPower Law Fit
Page 29
700 800 900 10000
0.005
0.01
0.015
0.02
Abs
orpt
ion
Coe
ffic
ient
(m
m-1
)Wavelength(nm)
FDPMSSFDPMChromophore Fit
Oxyhemoglobin = 12.7 µM Deoxyhemoglobin = 4.1 µM
Water = 21.5% Lipid = 79.6%
LcII
ε=⎟⎟⎠
⎞⎜⎜⎝
⎛0log
650 700 750 800 850 900 950 10000.0
0.2
0.4
0.6
0.8
1.0
Abs
orpt
ion
(mm
-1m
M-1)
Wavelength(nm)
Tissue NIR absorbers
HHb
O2Hb
BULK LIPID
H2O
Page 34
Oxygen Metabolism
Arteriole 90 mmHg
Tissue 17 < 47 mmHg
Cell Mitochondria 2<30 mmHg
Venule 35
mmHg 10-30 mmHg
Oxygen demand
Oxygen Supply
Cell-vascular coupling
Page 35
Predicting Clinical Outcome
35 M. Herringlake, et al., Anesthesiology, 114, 58 (2011)
Total Population
High Risk Group
Optical endpoint: Pre-Surgical StO2 = HbO2/Hbtot Clinical endpoint: 30 day and 1 yr survival
n = 1200, Cardiac Bypass Surgery
Covidien INVOS
Page 36
Predicting Clinical Outcome
36 M. Herringlake, et al., Anesthesiology, 114, 58 (2011)
≤50% StO2 = ~25% greater chance of death at 1 year ≤50% StO2 = 45% SURVIVAL at 1 year (high risk group)
Total Population
High Risk Group
Covidien INVOS Optical endpoint: Pre-Surgical StO2 = HbO2/Hbtot Clinical endpoint: 30 day and 1 yr survival
Page 37
Cerebral hemodynamics during anesthesia Phenylephrine Ephedrine
Lingzhong Meng
L. Meng, et al. Brit J. Anes, 107, 209 (2011)
ISS Oxiplex (Frequency Domain)
Page 38
Cerebral hemodynamics during anesthesia Phenylephrine Ephedrine
Lingzhong Meng
L. Meng, et al. Brit J. Anes, 107, 209 (2011)
ISS Oxiplex (Frequency Domain)
<65% ~3-4 minutes/bolus
Page 39
Cerebral hemodynamics during anesthesia Phenylephrine Ephedrine
Lingzhong Meng
L. Meng, et al. Brit J. Anes, 107, 209 (2011)
ISS Oxiplex (Frequency Domain)
<65% ~3-4 minutes/bolus
Cardiac Output Drop
Page 40
Cerebral hemodynamics during anesthesia Phenylephrine Ephedrine
Lingzhong Meng
L. Meng, et al. Brit J. Anes, 107, 209 (2011)
ISS Oxiplex (Frequency Domain)
<65% ~3-4 minutes/bolus
Cardiac Output Drop
Phenylephrine: Rapid Rise in MAP: drop in StO2
Cognitive impairment, survival risk
Page 41
Tissue Oxygenation during Exercise
Page 42
G. Ganesan et al. Ped Ex Sci, 2015
Page 43
G. Ganesan et al. Ped Ex Sci, 2015
Page 44
Drop in ET CO2
Rise in ET CO2 Blood Acidosis
G. Ganesan et al. Ped Ex Sci, 2015
Page 45
G. Ganesan et al. Ped Ex Sci, 2015
Page 46
G. Ganesan et al. Ped Ex Sci, 2015
Page 47
Ganesan G, et al. Med Sci Sports Ex. (2014)
Page 48
Ganesan G, et al. Med Sci Sports Ex. (2014)
Page 49
Pre-frontal Cortex: Paced Breathing
OxyHb and DeoxyHb phase delay
OxyHb and Khine strain sensor DeoxyHb and Khine strain sensor
2 2.5 3 2 2.5 3
minutes minutes
Peak inhale Peak inhale
Page 50
Obesity and Metabolic Syndrome
Subcutaneous Adipose Tissue (AT) Promotes Insulin, Leptin Resistance and Metabolic Syndrome:
-Shrink Adipocytes and AT burden
• Does DOSI detect structural and functional changes in AT? (n=10)
• Can DOSI provide early feedback on diet and other
interventions in metabolic disease? (12 weeks)
Dr. Shaista Malik, Director, Samueli Ctr., UCI Dept. of Cardiology
Page 51
Non-invasive Abdominal Fat: Weight Loss Patient
12 week Calorie Restricted Diet
0.005
0.01
0.015
0.02
0.025
650 700 750 800 850 900 950 1000
µ a (m
m-1
)
Wavelength (nm)
Absorption Coefficient – M3
Baseline Post - Weight Loss (6 weeks) 0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
650 700 750 800 850 900 950 1000
µ s' (
mm
-1)
Wavelength (nm)
Reduced Scattering Coefficient –M3 (7.5 cm right of navel)
Baseline Post - Weight Loss (6 weeks)
baseline
baseline
6 weeks
6 weeks
Absorption Spectrum Lipid
Water
DeoxyHb
Scattering Spectrum
Ultrasound 2-3 cm adipose layer
G. Ganesan et al., Int J. Obesity, (2016)
Page 52
Non-invasive Abdominal Fat: Weight Loss Patient 12 week Calorie Restricted Diet
t
Baseline 3 Months “A” scattering parameter
G. Ganesan et al., Int J. Obesity, (2016)
Water
Scattering
Page 53
Non-invasive Abdominal Fat: Weight Loss Patient 12 week Calorie Restricted Diet
G. Ganesan et al., Int J. Obesity, (2016)
Water
Page 54
Problem: Breast Cancer Detection, Diagnosis, Therapy Monitoring
Is the Tumor Malignant or Benign? Is it Responding to Chemotherapy?
Dr. Rita Mehta
Dr. Alice Police
Dr. Freddie Combs
Page 55
Diffuse Optical Spectroscopic Imaging (DOSI)
Bevilacqua, F., A. J. Berger, et al. Appl Opt 39(34): 6498-507 (2000).
Scattering Absorption : :
White light
Laser diodes
Spectro- graph
APD
SS: 650-1100 nm
Frequency-Domain: ~400 MHz
Broadband temporal Frequency Domain Photon Migration (FDPM) + CW-NIRS
Tromberg, BJ, Pogue, BW, et al., Med. Phys., 35(6), 2443-2451, (2008).
500 MHz
ACRIN trial: UCI, Penn, Dartmouth, MGH, UCSF, MD Anderson, Boston U.
Page 56
Oxy-Hemoglobin
Lipid
Water Deoxy-Hemoglobin
Tromberg et al. Can Res (2016)
Page 57
Responder
Non Responder
Tromberg et al. Can Res (2016)
Page 58
DOSI Baseline 6691-08 TOI = (HbR x H2O)/lipid
US Baseline: Depth: ~0.5-1.5 cm Size: ~2cm x 1cm
DCE-MRI Baseline
Case Study: 52 yr, peri-menoapausal, BIRADS 3, 2cm, Metaplastic carcinoma, Triple negative
Page 59
DOSI 1 week 6691-08 %Δ TOI ~ -30%
US 1 Week: Depth: ~0.5-1.5 cm Size: ~2cm x 1cm
%Δ ~ 0
Case Study: 52 yr, peri-menoapausal, BIRADS 3, 2cm, Metaplastic carcinoma, Triple negative
Page 60
Breast Density, Risk
Does Tamoxifen Work for You?
(e.g. CYP2D6 polymorphisms)
Should You Take it For 5 Years?
12 months Tamoxifen +10% Lipid -47% Density
%Lipid
With Gopi Meenakshisundaram and Aditi Majumder, UCI
Baseline
Page 61
Conclusions
Diffuse Optics: Bedside Monitoring
• Imaging drug/radiation therapy • Surgical guidance • Predicting Risk/Outcome • Multi-modality Imaging
Continuous, Frequent Monitoring, Wearable Sensors Personalized Physiology and Medicine w/genomics
Challenge: Link optical endpoints to clinical outcome
Page 62
DOSI Imaging: Anais Leproux, Rob Warren, Brian Hill, Amanda Durkin, Jesse Lam, Hossain Yazdi, Drew Reilly, Goutham Ganesan, Alex Matlock Albert Cerussi (Apple), Keunsik No (LG), Darren Roblyer (BU), Tom O’Sullivan (ND) Drs. Dan Cooper, Shlomit Aizak, Pietro Gallasetti, Shaista Malik, Alice Police, Freddy Combs, Rita Mehta
NIBIB P41 Laser Microbeam and Medical Program; NCI Chao Comprehensive Cancer Center
NIH R01CA142989, R21EB014440, R21NS078634; NCI American College of Radiology Imaging Network
AFOSR Military Photomedicine Program; Arnold and Mabel Beckman Foundation
Acknowledgements
Page 63
Optical Property Mapping 2 cm
http://
www.bli.uci.edu/
http://www.virtualphotonics.org/vts/