Method and apparatus to identify vulnerable plaques with thermal wave imaging of heated nanoparticles

Patent metadata

Field	Value
Publication number	US-9289131-B2
Application number	US-201113312622-A
Country	US
Kind code	B2
Filing date	Dec 6, 2011
Priority date	Oct 20, 2006
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

Provided herein are systems, methods, and compositions for the thermal imaging of cells with nanoparticles.

First claim

What is claimed is:

1. A thermal imaging device comprising:
a. a catheter body optically coupled to a conduit, a thermal sensor coupled to a thermal imaging apparatus, the thermal imaging apparatus coupled to an optical coherence tomography system, and a heating element coupled to a heating source, wherein the heating source is configured to provide a modulation frequency selected at one or more frequencies to create a magnitude and a phase difference of thermal waves between a nanoparticle and a background area of the nanoparticle and the thermal imaging apparatus amplifies the phase difference of thermal wave by multiplication of the intensity of the heating; and
b. a computer processor configured to process the magnitude and phase difference of the thermal wave from the background area to produce a thermal image.

2. The thermal imaging device of claim 1 , wherein the heating source is a laser source emitting pulsed light to heat the nanoparticle and produce a contrast between the nanoparticle and the background area of the nanoparticle.

3. The thermal imaging device of claim 2 , wherein the laser source is coupled to a light detector and a frequency controller.

4. The thermal imaging device of claim 1 , wherein the catheter body is coupled to a pull-back mechanism, including a mount for the conduit of the catheter body.

5. The thermal imaging device of claim 1 , wherein the heating source is a magnet.

6. The thermal imaging device of claim 5 , wherein the heating source is configured to apply an oscillating magnetic field.

7. The thermal imaging device of claim 1 , wherein the thermal sensor is a thermistor.

8. The thermal imaging device of claim 1 , further comprising an ultrasound system operatively coupled to the thermal imaging apparatus.

9. The thermal imaging device of claim 1 , further comprising a system operatively coupled to the thermal imaging apparatus to administer a plurality of metallic nanoparticles as to decrease phase values at a specific modulation frequency as nanoparticle thermal wave strength (dTo-np) increased.

10. The thermal imaging device of claim 9 , wherein at least one nanoparticle is configured to localize to a target site.

11. The thermal imaging device of claim 10 , wherein the nanoparticles are substantially spherical and have a diameter from about 0.1 nanometers to about 1000.0 nanometers in size.

12. The thermal imaging device of claim 9 , wherein the nanoparticles are multifunctional nanoparticles including an aminodextran coating.

13. The thermal imaging device of claim 9 , wherein the nanoparticle is coated with a light responsive compound that is selectively released upon incident light.

14. The thermal imaging device of claim 1 , wherein the heat source is coupled to a mirror element and the mirror element is configured to rotate in a 360 degree arc.

15. The thermal imaging device of claim 1 , wherein the heating element further comprises generating light energy emitted by a pulsed laser source.

16. The thermal imaging device of claim 1 , wherein the computer processor is configured to process the thermal wave from the background areas (BK) by the formula:

Δ
⁢

⁢

S
BK

⁡

(
s
)

=

C
d

⁢

μ
a_IR

⁢
Δ
⁢

⁢

T
BK_o

(

s
+

μ
a_IR

⁢

Ds

)

⁢

μ
a_BK

μ
a_BK
2

-

s
/
D

,

where μa_BK is the optical absorption coefficient of the background at a laser radiation wavelength, μa_IR is an infrared absorption coefficient, μa is an absorption coefficient of a sample, D is thermal diffusivity, ΔTBK_o is the initial temperature distribution for the background, s is the thermal wave, and Cd is a proportionality constant of the thermal sensor.

17. The thermal imaging device of claim 1 , wherein the heat source includes a wavelength of light between at least 800-1300 nm to avoid chromophores in the background of the nanoparticles.

18. The thermal imaging device of claim 1 , wherein the heating source is configured to inversely modulate the frequency proportional to the thermal-wave attenuation distance (LD).

19. The thermal imaging device of claim 1 , wherein the thermal sensor is operably coupled to an infrared camera.

20. The thermal imaging device of claim 19 , wherein the thermal sensor further comprises an infrared radiation sensor, which can be electrically coupled to an electrical wire to transmit the infrared radiation signal to an infrared camera.

Assignees

• Castella Paul
• Kim Jihoon
• Univ Texas

Inventors

• Castella Paul
• Kim Jihoon

Classifications

• A61K49/00

  Preparations for testing in vivo · CPC title

• A61B5/6852

  Catheters · CPC title

• A61B5/0066

  Optical coherence imaging · CPC title

• A61N2/02

  using magnetic fields produced by coils, including single turn loops or electromagnets (A61N2/12 takes precedence) · CPC title

• G01N21/4795

  spatially resolved investigating of object in scattering medium (in vivo A61B) · CPC title