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Comparison of Choroidal Thickness Measurements Using Semiautomated and Manual Segmentation Methods / Mei Zhao in OVS : Optometry & Vision Science, vol. 97, 02 (Février 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 02 (Février 2020)
Titre : Comparison of Choroidal Thickness Measurements Using Semiautomated and Manual Segmentation Methods Type de document : article de périodique Auteurs : Mei Zhao ; David Alonso-Caneiro ; Roger Lee ; Allen M. Y. Cheong ; Wing-Yan Yu ; Ho-Yin Wong ; Andrew K. C. Lam Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Études d'évaluation comme sujet
[Thésaurus Mesh]Méthodes
[Thésaurus Mesh]Poids et mesures
[Thésaurus Mesh]Tomographie par cohérence optique
[Thésaurus HELB]:Optique:Épaisseur choroïdienne fovéolaireMots-clés : weights and measures evaluation studies as topic methods Résumé : SIGNIFICANCE
This study demonstrated that a semiautomated segmentation method could help inexperienced practitioners to obtain choroidal thickness as good as experienced practitioners.
PURPOSE
The purpose of this study was to compare choroidal thickness measurements obtained by semiautomated and manual segmentation methods.
METHODS
Optical coherence tomography images of 37 eyes from 37 healthy young subjects acquired by a spectral-domain optical coherence tomography device were reviewed retrospectively. Two naive examiners measured choroidal thickness using manual and semiautomated methods, whereas two experienced examiners used only the semiautomated method. The semiautomated method referred to a fully automated segmentation program customized based on MATLAB and followed manual verification. After highlighting the inner and outer choroidal boundaries through automated segmentation, examiners reviewed these boundaries in each B-scan and conducted manual revisions if segmentation errors occurred. After selecting points where correct boundary was located, the software used a spline fit to blend the corrected region with the rest of the boundary. All measurements were summarized in a 6-mm Early Treatment Diabetic Retinopathy Study grid. Operation time spent to complete retinal and choroidal segmentation on each eye was recorded. Between-examiner agreements, that is, intraclass correlation coefficient and coefficient of reproducibility (CoR), were calculated among four sets of semiautomated measurements, and within-examiner agreements were comparisons between manual and semiautomated results from the same naive examiners. Eyes with thin or thick choroids were also analyzed separately.
RESULTS
The between-examiner and within-examiner agreements were excellent with intraclass correlation coefficient of 0.976 or greater. Pairwise within-examiner CoRs ranged from 17.4 to 47.1 μm. Pairwise between-examiner CoRs were between 13.0 and 38.9 μm. Eyes with thin choroid had better agreements than those with thick choroids. On average, naive examiners saved 3 to 5 minutes per eye using the semiautomated method.
CONCLUSIONS
With the help of a dedicated software, inexperienced practitioners could obtain choroidal thickness measurements with accuracy similar to experienced practitioners. Processing time with the semiautomated method was also reduced..
Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Effect of Topical Pilocarpine on Choroidal Thickness in Healthy Subjects / Dmitrii S Maltsev in OVS : Optometry & Vision Science, vol. 97, 06 (Juin 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 06 (Juin 2020) . - p. 457-461
Titre : Effect of Topical Pilocarpine on Choroidal Thickness in Healthy Subjects Type de document : article de périodique Auteurs : Dmitrii S Maltsev ; Alexei N Kulikov ; Alexander S. Vasiliev Année de publication : 2020 Article en page(s) : p. 457-461 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Pilocarpine
[Thésaurus HELB]:Optique:Épaisseur choroïdienne fovéolaireRésumé : SIGNIFICANCE: This is a proof-of-concept study showing the possibility of pharmacological control for choroidal thickness using pilocarpine as an agent that causes 2 to 5% choroidal thinning in healthy eyes after the instillation. PURPOSE: The purpose of this article was to study the effect of instillation of 1% pilocarpine on choroidal thickness in healthy subjects. METHODS: Sixteen healthy individuals (seven males and nine females; mean ± standard deviation age, 25.8 ± 3.3 years) were included. All participants received optical coherence tomography to evaluate subfoveal choroidal thickness (SCT) and choroidal area on cross-sectional scan within 4-mm central area. Axial length was measured using optical biometry. Optical coherence tomography was performed before and after pilocarpine was instilled six times for a 75-minute period in one eye; the fellow eye was used as the control. Subfoveal choroidal thickness and choroidal area were measured by two masked graders in random fashion and averaged for analysis. RESULTS: After instillation of 1% pilocarpine, percentage SCT change in study and control eye was −3.3 ± 3.8% and 0.4 ± 3.2%, respectively (P = .03). Percentage change choroidal area in study and control eye was −2.3 ± 2.5% and 0.8 ± 3.3%, respectively (P < .001). There was a correlation between percentage SCT change and axial length (r = −0.56, P < .001), as well as between percentage SCT change and baseline SCT (r = 0.72, P < .001). CONCLUSIONS: Instillation of 1% pilocarpine causes a decrease of choroidal thickness, which is more substantial in eyes with short axial length and thick choroid. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Impact of Cardiovascular Disease Risk Factors on Subfoveal Choroidal Thickness by Enhanced-depth Spectral Domain Optical Coherence Tomography / Rachel Druckenbrod in OVS : Optometry & Vision Science, vol. 97, 02 (Février 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 02 (Février 2020)
Titre : Impact of Cardiovascular Disease Risk Factors on Subfoveal Choroidal Thickness by Enhanced-depth Spectral Domain Optical Coherence Tomography Type de document : article de périodique Auteurs : Rachel Druckenbrod ; Baharak Asefzadeh ; Anne Bertolet Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]:M:Maladies cardiovasculaires:Maladies cardiovasculaires / diagnostic
[Thésaurus Mesh]Choroïde
[Thésaurus Mesh]Comorbidité
[Thésaurus Mesh]Maladies cardiovasculaires
[Thésaurus Mesh]Maladies de la choroïde
[Thésaurus Mesh]Marqueurs biologiques
[Thésaurus Mesh]Tomographie par cohérence optique
[Thésaurus Mesh]Uvée
[Thésaurus HELB]:Optique:Épaisseur choroïdienne fovéolaireMots-clés : cardiovascular diseases comorbidity choroid diseases tomography, optical coherence Biomarkers Résumé : SIGNIFICANCE: Risk stratification plays a large role in cardiovascular disease (CVD) management. Spectral-domain
optical coherence tomography (SD-OCT) allows for noninvasive analysis of the ophthalmic vasculature, with potential
for systemic disease surveillance. Subfoveal choroidal thickness (SFCT) may serve as a marker for CVD risk and
play a role in risk stratification.
PURPOSE: This study aimed to explore the association of major CVD risk factors CVD on SFCT measured from
SD-OCT images in a general population of U.S. veterans.
METHODS: One hundred fifty veterans were prospectively recruited at the Jamaica Plain VA Hospital (Boston, MA).
A total of 143 participants were included in the final analysis. The SFCT was manually measured from Spectralis
SD-OCT macular scans, and medical chart review was analyzed for CVD data. The SFCT measurements were correlated with CVD risk factors and CVD clinical makers while controlling for age and refractive error. Mean differences
in SFCT between those with and without CVD risk factors were analyzed.
RESULTS: In multivariate analysis, diabetes diagnosis was independently associated with thinner subfoveal choroid (P = .001) and hypertension and hyperlipidemia with thicker subfoveal choroid (P = .006 and P = .05). After
adjusting for age and refractive error, veterans with diabetes had thinner choroids than those without (P = .02), and
veterans with hypertension and hyperlipidemia had thicker choroids than those without, although these differences
did not reach statistical significance (P = .07 and P = .1).
CONCLUSIONS: Comorbid risk factors for CVD are independently associated with optical coherence tomography–
derived measurements of subfoveal choroidal thickness in a vasculopathic population of U.S. veterans, and there
are detectable differences in subfoveal choroidal thickness between groups with and without CVD risk factors.
Larger studies with adequate controls and longitudinal design are necessary to assess the clinical role of SFCT
measurements in CVD risk analysis.
Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Subfoveal Choroidal Thickness in Pre-eclampsia / Siti Nurhuda Sharudin in OVS : Optometry & Vision Science, vol. 97, 02 (Février 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 02 (Février 2020)
Titre : Subfoveal Choroidal Thickness in Pre-eclampsia Type de document : article de périodique Auteurs : Siti Nurhuda Sharudin ; Rahmah Saaid ; Amir Samsudin ; Nor Fadhilah Mohamad, Auteur Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus HELB]:Optique:Épaisseur choroïdienne fovéolaire
[Thésaurus HELB]:Paramédical:Pré-éclampsie
[Thésaurus Mesh]Choroïde
[Thésaurus Mesh]Comorbidité
[Thésaurus Mesh]Marqueurs biologiques
[Thésaurus Mesh]Tomographie par cohérence optiqueRésumé : SIGNIFICANCE: To our knowledge, this is the first time a study looking at the association between subfoveal choroidal thickness (SFCT) and the parameters affecting the severity of pre-eclampsia has been reported. We provide
evidence that SFCT is thicker in pre-eclamptic (PE) patients and speculate on the possible causes.
PURPOSE: The purposes of this study were to compare SFCT in PE, normal pregnant, and nonpregnant women
using spectral domain optical coherence tomography and to correlate SFCT with severity of pre-eclampsia.
METHODS: A cross-sectional, observational study was performed. A total of 150 participants were divided into
three groups: group 1 (50 PE women), group 2 (50 normal pregnant women), and group 3 (50 nonpregnant healthy
women). Subfoveal choroidal thickness was measured using spectral domain optical coherence tomography. Other
parameters including mean arterial blood pressure (MABP), central corneal thickness, macular thickness,
IOP, ocular perfusion pressure (OPP), and urine protein-to-creatinine ratio were also measured. ANOVA and
Pearson correlation analysis were used to look at differences between the groups. P < .05 was considered
as statistically significant.
RESULTS: The MABP was higher in group 1 than in groups 2 and 3 (103.0 ± 12.9 vs. 83.2 ± 9.8 vs.
89.5 ± 7.2 mmHg, respectively; all P < .001). The SFCT of the PE group was higher than in groups 2 and 3
(370.7 ± 23.8 vs. 344.5 ± 30.8 vs. 315.8 ± 49.9 μm, respectively; all P < .001). There were no statistically
significant differences in central corneal thickness, macular thickness, or IOP between the PE and healthy pregnant groups (all P > .05). The OPP was greater in PE patients (52.8 ± 8.5 vs. 41.9 ± 6.9 vs. 43.4 ± 5.2 mmHg,
respectively; both P < .001). The SFCT was positively correlated with MABP (r = 0.464, P < .001), OPP (r = 0.495,
P < .001), and urine protein-to-creatinine ratio (r = 0.635, P < .001) in the PE group.
CONCLUSIONS: Subfoveal choroidal thickness is higher in pre-eclampsia and is proportional to established
markers of severity of the condition. This parameter might serve as a novel predictive marker for the severity of
pre-eclampsiaPermalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire