Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Brasileira de Oftalmologia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72802013000200005 |
Resumo: | OBJECTIVE: To describe a novel technique for clinical characterization of corneal biomechanics using non-invasive dynamic imaging. METHODS: Corneal deformation response during non contact tonometry (NCT) is monitored by ultra-high-speed (UHS) photography. The Oculus Corvis ST (Scheimpflug Technology; Wetzlar, Germany) has a UHS Scheimpflug camera, taking over 4,300 frames per second and of a single 8mm horizontal slit, for monitoring corneal deformation response to NCT. The metered collimated air pulse or puff has a symmetrical configuration and fixed maximal internal pump pressure of 25 kPa. The bidirectional movement of the cornea in response to the air puff is monitored. RESULTS: Measurement time is 30ms, with 140 frames acquired. Advanced algorithms for edge detection of the front and back corneal contours are applied for every frame. IOP is calculated based on the first applanation moment. Deformation amplitude (DA) is determined as the highest displacement of the apex in the highest concavity (HC) moment. Applanation length (AL) and corneal velocity (CVel) are recorded during ingoing and outgoing phases. CONCLUSION: Corneal deformation can be monitored during non contact tonometry. The parameters generated provide clinical in vivo characterization of corneal biomechanical properties in two dimensions, which is relevant for different applications in Ophthalmology. |
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Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical propertiesBiomechanicsCornea/physiologyCorneal topography/methodsTonometryocular/methodsOBJECTIVE: To describe a novel technique for clinical characterization of corneal biomechanics using non-invasive dynamic imaging. METHODS: Corneal deformation response during non contact tonometry (NCT) is monitored by ultra-high-speed (UHS) photography. The Oculus Corvis ST (Scheimpflug Technology; Wetzlar, Germany) has a UHS Scheimpflug camera, taking over 4,300 frames per second and of a single 8mm horizontal slit, for monitoring corneal deformation response to NCT. The metered collimated air pulse or puff has a symmetrical configuration and fixed maximal internal pump pressure of 25 kPa. The bidirectional movement of the cornea in response to the air puff is monitored. RESULTS: Measurement time is 30ms, with 140 frames acquired. Advanced algorithms for edge detection of the front and back corneal contours are applied for every frame. IOP is calculated based on the first applanation moment. Deformation amplitude (DA) is determined as the highest displacement of the apex in the highest concavity (HC) moment. Applanation length (AL) and corneal velocity (CVel) are recorded during ingoing and outgoing phases. CONCLUSION: Corneal deformation can be monitored during non contact tonometry. The parameters generated provide clinical in vivo characterization of corneal biomechanical properties in two dimensions, which is relevant for different applications in Ophthalmology.Sociedade Brasileira de Oftalmologia2013-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72802013000200005Revista Brasileira de Oftalmologia v.72 n.2 2013reponame:Revista Brasileira de Oftalmologia (Online)instname:Sociedade Brasileira de Oftalmologia (SBO)instacron:SBO10.1590/S0034-72802013000200005info:eu-repo/semantics/openAccessAmbrósio Jr,RenatoRamos,IsaacLuz,AllanFaria,Fernando CorreaSteinmueller,AndreasKrug,MatthiasBelin,Michael W.Roberts,Cynthia Janeeng2013-06-28T00:00:00Zoai:scielo:S0034-72802013000200005Revistahttps://rbo.emnuvens.com.br/rbo/indexhttps://old.scielo.br/oai/scielo-oai.phpsob@sboportal.org.br||rbo@sboportal.org.br1982-85510034-7280opendoar:2013-06-28T00:00Revista Brasileira de Oftalmologia (Online) - Sociedade Brasileira de Oftalmologia (SBO)false |
dc.title.none.fl_str_mv |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
title |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
spellingShingle |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties Ambrósio Jr,Renato Biomechanics Cornea/physiology Corneal topography/methods Tonometry ocular/methods |
title_short |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
title_full |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
title_fullStr |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
title_full_unstemmed |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
title_sort |
Dynamic ultra high speed Scheimpflug imaging for assessing corneal biomechanical properties |
author |
Ambrósio Jr,Renato |
author_facet |
Ambrósio Jr,Renato Ramos,Isaac Luz,Allan Faria,Fernando Correa Steinmueller,Andreas Krug,Matthias Belin,Michael W. Roberts,Cynthia Jane |
author_role |
author |
author2 |
Ramos,Isaac Luz,Allan Faria,Fernando Correa Steinmueller,Andreas Krug,Matthias Belin,Michael W. Roberts,Cynthia Jane |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Ambrósio Jr,Renato Ramos,Isaac Luz,Allan Faria,Fernando Correa Steinmueller,Andreas Krug,Matthias Belin,Michael W. Roberts,Cynthia Jane |
dc.subject.por.fl_str_mv |
Biomechanics Cornea/physiology Corneal topography/methods Tonometry ocular/methods |
topic |
Biomechanics Cornea/physiology Corneal topography/methods Tonometry ocular/methods |
description |
OBJECTIVE: To describe a novel technique for clinical characterization of corneal biomechanics using non-invasive dynamic imaging. METHODS: Corneal deformation response during non contact tonometry (NCT) is monitored by ultra-high-speed (UHS) photography. The Oculus Corvis ST (Scheimpflug Technology; Wetzlar, Germany) has a UHS Scheimpflug camera, taking over 4,300 frames per second and of a single 8mm horizontal slit, for monitoring corneal deformation response to NCT. The metered collimated air pulse or puff has a symmetrical configuration and fixed maximal internal pump pressure of 25 kPa. The bidirectional movement of the cornea in response to the air puff is monitored. RESULTS: Measurement time is 30ms, with 140 frames acquired. Advanced algorithms for edge detection of the front and back corneal contours are applied for every frame. IOP is calculated based on the first applanation moment. Deformation amplitude (DA) is determined as the highest displacement of the apex in the highest concavity (HC) moment. Applanation length (AL) and corneal velocity (CVel) are recorded during ingoing and outgoing phases. CONCLUSION: Corneal deformation can be monitored during non contact tonometry. The parameters generated provide clinical in vivo characterization of corneal biomechanical properties in two dimensions, which is relevant for different applications in Ophthalmology. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-04-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72802013000200005 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72802013000200005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0034-72802013000200005 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Oftalmologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Oftalmologia |
dc.source.none.fl_str_mv |
Revista Brasileira de Oftalmologia v.72 n.2 2013 reponame:Revista Brasileira de Oftalmologia (Online) instname:Sociedade Brasileira de Oftalmologia (SBO) instacron:SBO |
instname_str |
Sociedade Brasileira de Oftalmologia (SBO) |
instacron_str |
SBO |
institution |
SBO |
reponame_str |
Revista Brasileira de Oftalmologia (Online) |
collection |
Revista Brasileira de Oftalmologia (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Oftalmologia (Online) - Sociedade Brasileira de Oftalmologia (SBO) |
repository.mail.fl_str_mv |
sob@sboportal.org.br||rbo@sboportal.org.br |
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1752122336475086848 |