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Jens Randel Nyengaard

Improved sampling and analysis of images in corneal confocal microscopy

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Improved sampling and analysis of images in corneal confocal microscopy. / Schaldemose, E L; Fontain, F I; Karlsson, P; Nyengaard, J R.

In: Journal of Microscopy, Vol. 268, No. 1, 10.2017, p. 3-12.

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Schaldemose, EL, Fontain, FI, Karlsson, P & Nyengaard, JR 2017, 'Improved sampling and analysis of images in corneal confocal microscopy', Journal of Microscopy, vol. 268, no. 1, pp. 3-12. https://doi.org/10.1111/jmi.12581

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Schaldemose, E L ; Fontain, F I ; Karlsson, P ; Nyengaard, J R. / Improved sampling and analysis of images in corneal confocal microscopy. In: Journal of Microscopy. 2017 ; Vol. 268, No. 1. pp. 3-12.

Bibtex

@article{cc446ce368384e57b8004e5149b43912,
title = "Improved sampling and analysis of images in corneal confocal microscopy",
abstract = "INTRODUCTION: Corneal confocal microscopy (CCM) is a noninvasive clinical method to analyse and quantify corneal nerve fibres in vivo. Although the CCM technique is in constant progress, there are methodological limitations in terms of sampling of images and objectivity of the nerve quantification. The aim of this study was to present a randomized sampling method of the CCM images and to develop an adjusted area-dependent image analysis. Furthermore, a manual nerve fibre analysis method was compared to a fully automated method.METHODS: 23 idiopathic small-fibre neuropathy patients were investigated using CCM. Corneal nerve fibre length density (CNFL) and corneal nerve fibre branch density (CNBD) were determined in both a manual and automatic manner. Differences in CNFL and CNBD between (1) the randomized and the most common sampling method, (2) the adjusted and the unadjusted area and (3) the manual and automated quantification method were investigated.RESULTS: The CNFL values were significantly lower when using the randomized sampling method compared to the most common method (p = 0.01). There was not a statistical significant difference in the CNBD values between the randomized and the most common sampling method (p = 0.85). CNFL and CNBD values were increased when using the adjusted area compared to the standard area. Additionally, the study found a significant increase in the CNFL and CNBD values when using the manual method compared to the automatic method (p ≤ 0.001).CONCLUSION: The study demonstrated a significant difference in the CNFL values between the randomized and common sampling method indicating the importance of clear guidelines for the image sampling. The increase in CNFL and CNBD values when using the adjusted cornea area is not surprising. The observed increases in both CNFL and CNBD values when using the manual method of nerve quantification compared to the automatic method are consistent with earlier findings. This study underlines the importance of improving the analysis of the CCM images in order to obtain more objective corneal nerve fibre measurements.",
keywords = "Journal Article",
author = "Schaldemose, {E L} and Fontain, {F I} and P Karlsson and Nyengaard, {J R}",
note = "{\textcopyright} 2017 The Authors Journal of Microscopy {\textcopyright} 2017 Royal Microscopical Society.",
year = "2017",
month = oct,
doi = "10.1111/jmi.12581",
language = "English",
volume = "268",
pages = "3--12",
journal = "Journal of Microscopy",
issn = "0022-2720",
publisher = "Wiley-Blackwell Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - Improved sampling and analysis of images in corneal confocal microscopy

AU - Schaldemose, E L

AU - Fontain, F I

AU - Karlsson, P

AU - Nyengaard, J R

N1 - © 2017 The Authors Journal of Microscopy © 2017 Royal Microscopical Society.

PY - 2017/10

Y1 - 2017/10

N2 - INTRODUCTION: Corneal confocal microscopy (CCM) is a noninvasive clinical method to analyse and quantify corneal nerve fibres in vivo. Although the CCM technique is in constant progress, there are methodological limitations in terms of sampling of images and objectivity of the nerve quantification. The aim of this study was to present a randomized sampling method of the CCM images and to develop an adjusted area-dependent image analysis. Furthermore, a manual nerve fibre analysis method was compared to a fully automated method.METHODS: 23 idiopathic small-fibre neuropathy patients were investigated using CCM. Corneal nerve fibre length density (CNFL) and corneal nerve fibre branch density (CNBD) were determined in both a manual and automatic manner. Differences in CNFL and CNBD between (1) the randomized and the most common sampling method, (2) the adjusted and the unadjusted area and (3) the manual and automated quantification method were investigated.RESULTS: The CNFL values were significantly lower when using the randomized sampling method compared to the most common method (p = 0.01). There was not a statistical significant difference in the CNBD values between the randomized and the most common sampling method (p = 0.85). CNFL and CNBD values were increased when using the adjusted area compared to the standard area. Additionally, the study found a significant increase in the CNFL and CNBD values when using the manual method compared to the automatic method (p ≤ 0.001).CONCLUSION: The study demonstrated a significant difference in the CNFL values between the randomized and common sampling method indicating the importance of clear guidelines for the image sampling. The increase in CNFL and CNBD values when using the adjusted cornea area is not surprising. The observed increases in both CNFL and CNBD values when using the manual method of nerve quantification compared to the automatic method are consistent with earlier findings. This study underlines the importance of improving the analysis of the CCM images in order to obtain more objective corneal nerve fibre measurements.

AB - INTRODUCTION: Corneal confocal microscopy (CCM) is a noninvasive clinical method to analyse and quantify corneal nerve fibres in vivo. Although the CCM technique is in constant progress, there are methodological limitations in terms of sampling of images and objectivity of the nerve quantification. The aim of this study was to present a randomized sampling method of the CCM images and to develop an adjusted area-dependent image analysis. Furthermore, a manual nerve fibre analysis method was compared to a fully automated method.METHODS: 23 idiopathic small-fibre neuropathy patients were investigated using CCM. Corneal nerve fibre length density (CNFL) and corneal nerve fibre branch density (CNBD) were determined in both a manual and automatic manner. Differences in CNFL and CNBD between (1) the randomized and the most common sampling method, (2) the adjusted and the unadjusted area and (3) the manual and automated quantification method were investigated.RESULTS: The CNFL values were significantly lower when using the randomized sampling method compared to the most common method (p = 0.01). There was not a statistical significant difference in the CNBD values between the randomized and the most common sampling method (p = 0.85). CNFL and CNBD values were increased when using the adjusted area compared to the standard area. Additionally, the study found a significant increase in the CNFL and CNBD values when using the manual method compared to the automatic method (p ≤ 0.001).CONCLUSION: The study demonstrated a significant difference in the CNFL values between the randomized and common sampling method indicating the importance of clear guidelines for the image sampling. The increase in CNFL and CNBD values when using the adjusted cornea area is not surprising. The observed increases in both CNFL and CNBD values when using the manual method of nerve quantification compared to the automatic method are consistent with earlier findings. This study underlines the importance of improving the analysis of the CCM images in order to obtain more objective corneal nerve fibre measurements.

KW - Journal Article

U2 - 10.1111/jmi.12581

DO - 10.1111/jmi.12581

M3 - Journal article

C2 - 28548209

VL - 268

SP - 3

EP - 12

JO - Journal of Microscopy

JF - Journal of Microscopy

SN - 0022-2720

IS - 1

ER -