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Lasers Surg Med. 2006 Dec;38(10):913-9.

Selective photothermolysis of lipid-rich tissues: a free electron laser study.

Author information

  • 1Wellman Center for Photomedicine, Harvard Medical School, Boston, Massachusetts, USA. RRAnderson@partners.org

Abstract

BACKGROUND AND OBJECTIVES:

In theory, infrared vibrational bands could be used for selective photothermolysis of lipid-rich tissues such as fat, sebaceous glands, or atherosclerotic plaques.

STUDY DESIGN/MATERIALS AND METHODS:

Absorption spectra of human fat were measured, identifying promising bands near 1,210 and 1,720 nm. Photothermal excitation of porcine fat and dermis were measured with a 3.5-5 microm thermal camera during exposure to the free electron laser (FEL) at Jefferson National Laboratory. Thermal damage to full-thickness samples exposed at approximately 1,210 nm through a cold contact window, was assessed by nitrobluetetrazolium chloride staining in situ and by light microscopy.

RESULTS:

Photothermal excitation of fat was twice that of dermis, at lipid absorption bands (1,210, 1,720 nm). At 1,210 nm, a subcutaneous fat layer several mm thick was damaged by FEL exposure, without apparent injury to overlying skin.

CONCLUSION:

Selective photothermal targeting of fatty tissues is feasible using infrared lipid absorption bands. Potential clinical applications are suggested by this FEL study.

(c) 2006 Wiley-Liss, Inc.

PMID:
17163478
[PubMed - indexed for MEDLINE]
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