Photophysical processes in recent medical laser developments: A review

Boulnois, Jean-Luc

doi:10.1007/bf02030737

Cited by 618 publications

(291 citation statements)

References 47 publications

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“…Photocoagulation within a few seconds requires the power density of 100-1000 W/cm 2 [12,13]. The average power density of the spot was 170-370 W/cm 2 from 16.1 W at the source power of 50 W, that meets the minimum requirement.…”

Section: Discussionmentioning

confidence: 96%

A Coaxial Laser Endoscope with Arbitrary Spots in Endoscopic View for Fetal Surgery

Yamanaka

Yamashita

Masamune

et al. 2009

Medical Image Computing and Computer-Assisted Intervention – MICCAI 2009

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Abstract. In this paper, we describe a rigid endoscope that transmits a laser beam coaxially to arbitrary points in the endoscopic view, mainly for treatment of twin-to-twin transfusion syndrome. The endoscope consists of a hotmirror for coaxial transmission of visible light and a Nd:YAG laser beam, and galvanometers for controlling the beam irradiation angle. We evaluated the transmission efficiency of the laser power, the spot size through the endoscope and accuracy in positioning the beam. The maximum laser transmission efficiency was 39% and the spot diameter was 2.2-3.2 mm at a distance of 10-20 mm. The positioning accuracy was mostly within 1.0 mm in the endoscopic view at the distance. The average laser power density on the spot was estimated to be 170-370 W/cm 2 , and a chicken liver was successfully coagulated by changing the laser beam irradiation angle.

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Section: Discussionmentioning

confidence: 96%

A Coaxial Laser Endoscope with Arbitrary Spots in Endoscopic View for Fetal Surgery

Yamanaka

Yamashita

Masamune

et al. 2009

Medical Image Computing and Computer-Assisted Intervention – MICCAI 2009

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“…By molecular collisions the vibrational energy is transferred to thc surroundings as kinetic cnergy resulting in heat production and temperature increase. The origin of the hypertherniic component in PDT is then linked to: 1 ) molecular target absorption essentially from hemoproteins and pigments (melanin) and 2) the efficient decays of singlet state porphyrins ( S , ) (46). A temperature incrcasc in the tumour is also observed after red light irradiation without porphyrin present (47,48).…”

Section: Transmission Of Light In Tissuementioning

confidence: 99%

The Use Of Porphyrins And Non-Ionizing Radiation For Treatment Of Cancer

Evensen

1995

Acta Oncologica

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“…With this laser type, nonlinear optical processes such as 'plasma' induction and creation of a local shock wave can be induced. By this methotl a completely arhermal transformation of light energy into mechanical energy is possible (20).…”

Section: Lichocripsy I Neodymium Y Ag Laser Shock Wa11esmentioning

confidence: 99%

Laser Lithotripsy — The New Wave

Hochberger¹,

Ell²

1990

Canadian Journal of Gastroenterology

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Currently more than 90% of all common hile duct concrements can he rcmovcJ via the endoscopic retrograde route hy means of emloscopic papdlotomy, stone cxlrnction hy haskcts and ballonn catheters, or mechanic::il lithntripsy. Oversized, very hard or impacted stones however often st ill resist conventional endoscopic therapy. Laser lithotrtpsy represents a promistng new endoscopic approach to the nnnsurgical treatment of those common bile duct stones. Currently only short-pulsed laser systems with }ugh power peaks but low potential for thermal tissue damage are used for stone fragmentation. Systems in clinical applicaunn are the pulsed free-running-mode neodymium Y AG

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Photophysical processes in recent medical laser developments: A review

Cited by 618 publications

References 47 publications

A Coaxial Laser Endoscope with Arbitrary Spots in Endoscopic View for Fetal Surgery

A Coaxial Laser Endoscope with Arbitrary Spots in Endoscopic View for Fetal Surgery

The Use Of Porphyrins And Non-Ionizing Radiation For Treatment Of Cancer

Laser Lithotripsy — The New Wave

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