Small isotrope probes for in vivo measurements of fluence rate

Ivan S. Melnik; Igor Kravchenko

doi:10.1117/12.199243

18 January 1995 Small isotrope probes for in vivo measurements of fluence rate

Ivan S. Melnik, Igor Kravchenko

Proceedings Volume 2323, Laser Interaction with Hard and Soft Tissue II; (1995) https://doi.org/10.1117/12.199243
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

Optical fiber probes with isotropic response for direct measurement of fluence rate in tissue were studied. Two methods of probe fabrication were considered: in the first one, the isotropic spheres were fabricated by melting the fiber tips and then coated there with a layer of scattering material, in the second one, the spheres were fabricated from solid scattering material (milk glass). The core diameter of the quartz fiber was 120 micrometers ; maximum diameter of the probes was 420 micrometers . Anisotropy was determined as a standard deviation of light distribution at the isotropic fiber end. The second fiber end was coupled with different light sources: He-Ne, Ga-As lasers, or 200-W lamp. Melted probes had high anisotropy; it was necessary to cover the sphere by 4 or 5 layers to reduce the anisotropy less than 10%. Increase of isotropic response using a multi-layer covering was achieved at the expense of total transmission decrease (less than 1%). Melting technology deals with low reproduction and repetition of isotropic response. Anisotropy of glued probes was from 4.5% to 7.5% and total transmission ranged from 20% to 30%. Glued probes had sufficient mechanical strength to use their in vivo measurements of fluence rate. Because of influence of light coherency significant anisotropy increase was registered if the lamp was replaced by lasers.

Citation Download Citation

Ivan S. Melnik and Igor Kravchenko "Small isotrope probes for in vivo measurements of fluence rate", Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); https://doi.org/10.1117/12.199243

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Light scattering

Scattering

Anisotropy

Optical spheres

Glasses

Absorption

Light sources

Show All Keywords

Keywords/Phrases

Search In:

Publication Years