Comparative investigations of the effects of the neodymium:YAG laser at 1. 06 microns and 1. 32 microns on tissue

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Lasers Surg. Med.; (United States)

DOI:https://doi.org/10.1002/lsm.1900060614· OSTI ID:6350420

Frank, F; Beck, O J; Hessel, S; Keiditsch, E

The beneficial deep homogeneous coagulation of neodymium (Nd):YAG laser radiation at 1.06 microns owing to low absorption and high scattering in tissue has been documented widely. For another Nd:YAG laser wavelength at 1.32 microns the absorption coefficient of water and saline is approximately ten times higher than at 1.06 microns. This results in more efficient energy conversion into heat in tissue at 1.32 microns. The extinction coefficient in blood at 1.32 microns is only one-third of that at 1.06 microns. We would expect this to result in less heat dissipation by blood and deeper penetration in tissue at 1.32 microns. Nevertheless, at this wavelength scattering also contributes to an effective, uniform distribution of the laser light in the tissue. Animal experiments have been done to examine the effect of wavelength, irradiation time, and beam geometry on tissue damage and to assess its possible clinical uses. The results imply that the 1.32 microns wavelength will produce further indications for the use of the Nd:YAG laser in surgery.

• Research Organization: MBB-Medizintechnik GmbH, Munich, Germany, F.R.
• OSTI ID: 6350420
• Journal Information: Lasers Surg. Med.; (United States), Vol. 6
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
62 RADIOLOGY AND NUCLEAR MEDICINE
LASER RADIATION
BIOLOGICAL EFFECTS
NEODYMIUM LASERS
SAFETY
BLOOD
BRAIN
COMPARATIVE EVALUATIONS
DOGS
LIVER
RABBITS
SKIN
SPLEEN
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SWINE
TRACHEA
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ANIMALS
BIOLOGICAL MATERIALS
BODY
BODY FLUIDS
CENTRAL NERVOUS SYSTEM
DIGESTIVE SYSTEM
DOMESTIC ANIMALS
ELECTROMAGNETIC RADIATION
GLANDS
LASERS
MAMMALS
MATERIALS
MEDICINE
NERVOUS SYSTEM
ORGANS
RADIATIONS
RESPIRATORY SYSTEM
SOLID STATE LASERS
VERTEBRATES
560400* - Other Environmental Pollutant Effects
550600 - Medicine