Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

Karl Schulmeister; Reinhard Gilber; Bernhard Seiser; Florian Edthofer; Johannes Husinsky; Beate Fekete; Letizia Farmer

Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

Karl Schulmeister, Reinhard Gilber, Bernhard Seiser, Florian Edthofer, Johannes Husinsky, Beate Fekete, Letizia Farmer

Research output: Contribution to journal › Article

Abstract

A computer model was used to predict thresholds for 532 mm scanned retinal exposure for different retinal beam profile geometries, including rectangles and ring shaped profiles. The image analysis method described in IEC 60825-1 Edition 1.2 - maximizing the ratio of power within a rectangle over the value of a for this rectangle - was applied to the different profiles to determine a and the fractional power that would be compared to the MPE value. The predicted thresholds for these special types of retinal exposure were compared with the predicted damage theshold for top hat profiles for the value of a that resulted from the image analysis method. The comparison shows that the most restrictive power/a ratio method produces appropriate results, provided that a time dependent amax is used, as was proposed at BIOS 2006.

Original language	English
Number of pages	12
Journal	Ophthalmic Technologies XVIII, Proc. of SPIE
Volume	6844
Publication status	Published - 2008

Research Field

Biosensor Technologies

Keywords

laser safety; ICNIRP; computer model; retinal thermal injury; threshold; MPE; IEC60825-1; ANSI Z136.1

Cite this

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title = "Retinal thermal laser damage thresholds for different beam profiles and scanned exposure",

abstract = "A computer model was used to predict thresholds for 532 mm scanned retinal exposure for different retinal beam profile geometries, including rectangles and ring shaped profiles. The image analysis method described in IEC 60825-1 Edition 1.2 - maximizing the ratio of power within a rectangle over the value of a for this rectangle - was applied to the different profiles to determine a and the fractional power that would be compared to the MPE value. The predicted thresholds for these special types of retinal exposure were compared with the predicted damage theshold for top hat profiles for the value of a that resulted from the image analysis method. The comparison shows that the most restrictive power/a ratio method produces appropriate results, provided that a time dependent amax is used, as was proposed at BIOS 2006.",

keywords = "laser safety; ICNIRP; computer model; retinal thermal injury; threshold; MPE; IEC60825-1; ANSI Z136.1, laser safety; ICNIRP; computer model; retinal thermal injury; threshold; MPE; IEC60825-1; ANSI Z136.1",

author = "Karl Schulmeister and Reinhard Gilber and Bernhard Seiser and Florian Edthofer and Johannes Husinsky and Beate Fekete and Letizia Farmer",

year = "2008",

language = "English",

volume = "6844",

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TY - JOUR

T1 - Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

AU - Schulmeister, Karl

AU - Gilber, Reinhard

AU - Seiser, Bernhard

AU - Edthofer, Florian

AU - Husinsky, Johannes

AU - Fekete, Beate

AU - Farmer, Letizia

PY - 2008

Y1 - 2008

N2 - A computer model was used to predict thresholds for 532 mm scanned retinal exposure for different retinal beam profile geometries, including rectangles and ring shaped profiles. The image analysis method described in IEC 60825-1 Edition 1.2 - maximizing the ratio of power within a rectangle over the value of a for this rectangle - was applied to the different profiles to determine a and the fractional power that would be compared to the MPE value. The predicted thresholds for these special types of retinal exposure were compared with the predicted damage theshold for top hat profiles for the value of a that resulted from the image analysis method. The comparison shows that the most restrictive power/a ratio method produces appropriate results, provided that a time dependent amax is used, as was proposed at BIOS 2006.

AB - A computer model was used to predict thresholds for 532 mm scanned retinal exposure for different retinal beam profile geometries, including rectangles and ring shaped profiles. The image analysis method described in IEC 60825-1 Edition 1.2 - maximizing the ratio of power within a rectangle over the value of a for this rectangle - was applied to the different profiles to determine a and the fractional power that would be compared to the MPE value. The predicted thresholds for these special types of retinal exposure were compared with the predicted damage theshold for top hat profiles for the value of a that resulted from the image analysis method. The comparison shows that the most restrictive power/a ratio method produces appropriate results, provided that a time dependent amax is used, as was proposed at BIOS 2006.

KW - laser safety; ICNIRP; computer model; retinal thermal injury; threshold; MPE; IEC60825-1; ANSI Z136.1

M3 - Article

VL - 6844

JO - Ophthalmic Technologies XVIII, Proc. of SPIE

JF - Ophthalmic Technologies XVIII, Proc. of SPIE

ER -

Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

Abstract

Research Field

Keywords

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