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TECHNICAL PAPERS

Propagation of Focused and Multibeam Laser Energy in Biological Tissue

[+] Author and Article Information
Alex J. Fowler

Mechanical Engineering Department, University of Massachusetts Dartmouth, North Dartmouth, MA 02747Center for Engineering in Medicine, Massachusetts General Hospital, Boston, MA 02114e-mail: afowler@umassd.edu

M. Pinar Menguc

Center for Engineering in Medicine, Massachusetts General Hospital, Boston, MA 02114Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506

J Biomech Eng 122(5), 534-540 (May 26, 2000) (7 pages) doi:10.1115/1.1289993 History: Received June 06, 1999; Revised May 26, 2000
Copyright © 2000 by ASME
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References

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Figures

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A model system in which the target lies below the surface of a scattering and absorbing tissue
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Geometric arrangement for three different methods of delivering laser energy to the target
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for a focused beam normalized relative to a single collimated beam
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for a two-beam laser system as a function of the angle ϕ
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for a two-beam system with ϕ=π/8 normalized relative to a single collimated beam
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for a five-beam laser system as a function of the angle ϕ
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for a five beam system with ϕ=0.6 normalized relative to a single collimated beam
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Derivative of F with respect to s for all three beam geometries. The fluence of the focused beam is an order or magnitude more sensitive to s than are the other two geometries.
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Maximum fluence at the target (F) and the ratio of fluence at the target over surface fluence (R) for single collimated beams as a function of diameter (D) and dimensionless reduced scattering coefficient (s)
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Effect of dimensionless absorption on F and R for single collimated beams
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Comparison of a focused beam traveling through a two-layer skin model compared to the single layer results of Fig. 3(g=0.7)

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