Abstract
Unlike radiofrequency and ionizing radiation which can penetrate deeply into biological tissues, optical radiation is generally absorbed very superficially. Except for the relatively narrow band of visible and near-infrared (IR-A) radiation from approximately 400-1400 nm, skin and other biological tissues are nearly opaque to optical radiation. For this reason, the volumetric or mass-based concepts of absorbed dose (i.e., J/cm3 or J/gm) used in other areas of radiation biology are of little value. Additionally, the absorbed radiant energy is conducted out of the absorbing site and for this reason thermal effects depend largely upon the size and location of the absorbing site as well as exposure and exposure rate. Concepts of surface exposure dose are therefore most useful and practical. The concepts of fluence and fluence rate are shown to be useful for volume scattering in the visible spectral region where photochemical reactions are to be described.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Publisher | Society of Photo-Optical Instrumentation Engineers |
Pages | 438-445 |
Number of pages | 8 |
Volume | 3601 |
State | Published - 1999 |
Externally published | Yes |
Event | Proceedings of the 1999 Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical - San Jose, CA, USA Duration: Jan 24 1999 → Jan 27 1999 |
Other
Other | Proceedings of the 1999 Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical |
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City | San Jose, CA, USA |
Period | 1/24/99 → 1/27/99 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics