Ultrasound biomicroscopic localization and evaluation of intraocular foreign bodies

Laroche, Daniel; Ishikawa, Hiroshi; Greenfield, David S.; Liebmann, Jeffrey M.; Ritch, Robert

doi:10.1034/j.1600-0420.1998.760419.x

Cited by 22 publications

(19 citation statements)

References 13 publications

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“…Identification and localization of intraocular foreign bodies in eyes with opacified media or distorted anatomy require a radiographic or ultrasonographic evaluation. 7,12 X-ray, CT, magnetic resonance imaging (MRI), B-Scan US, and UBM are all important diagnostic tools in the evaluation of foreign bodies. 4,13 UBM has been reported to be helpful not only in detecting the foreign body, but also in distinguishing its composition.…”

Section: Discussionmentioning

confidence: 99%

“…4,13 UBM has been reported to be helpful not only in detecting the foreign body, but also in distinguishing its composition. 12 It is particularly valuable in the detection of small and nonmetallic foreign bodies. Foreign bodies made of wood or plastic may appear hypodense on CT and can be confused with air.…”

Section: Discussionmentioning

confidence: 99%

“…4 The exact location of the foreign body, particularly when very small, requires high resolution. Although the 10 MHz B-Scan US is a very useful test after ocular trauma, high-frequency (50 MHz) ultrasound is reported to be much better in showing the exact location of the foreign body and the condition of surrounding tissues 12,14 (Figure 7). Deramo et al 4 reported that UBM could detect small foreign bodies of various compositions, including those missed by CT or US.…”

Section: Discussionmentioning

confidence: 99%

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Ultrasound biomicroscopic evaluation of the traumatized eyes

Özdal

Mansour

Deschênes

2003

Eye

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Purpose To review causes for performing an ultrasound biomicroscopic (UBM) examination in traumatized eyes, to present common UBM findings of 109 eyes with a history of ocular trauma and to compare these findings according to the type of the trauma. Materials and methods A total of 109 eyes with a history of mechanical ocular trauma, which underwent an UBM examination between December 1996 and April 2002, were evaluated retrospectively. All cases were classified according to the criteria of the Ocular Trauma Classification Group and UBM findings were reviewed. For statistical analyses, v 2 test and Fisher's exact test were used. Results UBM examinations were performed for the evaluation of the zonules before cataract surgery (49.5%), examination of the anterior segment in the presence of media opacities (32.1%), detection of suspected ocular foreign bodies (10.1%) and the evaluation of ocular hypotony (8.3%). In all, 67 eyes (61.5%) had a closed-globe injury, whereas 42 (38.5%) had an open-globe injury. The most common UBM findings in a closed-globe injury were zonular deficiency (64.2%), angle recession (43.3%), iridodialysis (17.9%), and dislocated lens (16.4%). The most common UBM findings in an open-globe injury were zonular deficiency (54.8%), iridodialysis (26.2%), peripheral anterior synechiae (PAS) (26.2%), and iridocorneal adhesion (19%). Among the common UBM findings, the angle recession was significantly higher (Po0.001) in closedglobe injury group and PAS formation was significantly higher (Po0.05) in open-globe injury group. Conclusions UBM is particularly superior to other methods in the evaluation of the zonular status, angle recession, cyclodialysis, and the detection of small superficial and intraocular foreign bodies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Ultrasound biomicroscopic evaluation of the traumatized eyes

Özdal

Mansour

Deschênes

2003

Eye

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“…Foreign bodies generate various artifacts based on their acoustic characteristics [12]. In general, materials that contain air (ie, wood and concrete) create shadowing artifact by absorbing most of the incoming ultrasound at their sites, whereas hard and dense materials (ie, metal and glass) generate comet tail artifacts by reflecting ultrasound back and forth within the materials (Fig.…”

Section: Ocular Traumamentioning

confidence: 99%

Anterior segment imaging: ultrasound biomicroscopy

Ishikawa¹,

Schuman²

2004

Ophthalmology Clinics of North America

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High-frequency ultrasound biomicroscopy (UBM) (Paradigm Medical Industries, Salt Lake City, Utah) provides high-resolution in vivo imaging of the anterior segment in a noninvasive fashion. In addition to the tissues easily seen using conventional methods (ie, slit lamp), such as the cornea, iris, and sclera, structures including the ciliary body and zonules, previously hidden from clinical observation, can be imaged and their morphology assessed. Pathophysiologic changes involving anterior segment architecture can be evaluated qualitatively and quantitatively. This article discusses the role of UBM in imaging of the anterior segment of the eye from the qualitative and quantitative analysis point of view. Equipment and techniqueThe technology for UBM, originally developed by Pavlin, Sherar, and Foster, is based on 50-to 100-MHz transducers incorporated into a B-mode clinical scanner [1][2][3]. Higher frequency transducers provide finer resolution of more superficial structures, whereas lower frequency transducers provide greater depth of penetration with less resolution. The commercially available units operate at 50 MHz and provide lateral and axial physical resolutions of approximately 50 μm and 25 μm, respectively. Tissue penetration is approximately 4 to 5 mm. The scanner produces a 5 × 5 mm field with 256 vertical image lines (or A-scans) at a scan rate of 8 frames per second.Each A-scan is mapped into oversampled 1024 points, with 256 gray-scale levels representing the logged amplitude of reflection, and then the number of points is downsized to 432 pixels to fit on the UBM monitor. The real-time image is displayed on a video monitor and can be recorded on videotape for later analysis. Room illumination, fixation, and accommodative effort affect anterior segment anatomy and should be held constant, particularly when quantitative information is being gathered.The image acquisition technique has been described elsewhere and is similar to traditional immersion B-scan ultrasonography [3][4][5]. In the Paradigm Instruments UBM, the probe is suspended from a gantry arm to minimize motion artifacts, and lateral distortion is minimized by a linear scan format. In the OTI (Ophthalmic Technologies, Toronto, Canada) device, the probe is small and light enough not to require a suspension arm, and a sector scanning method is used. Scanning is performed with the patient in the supine position. A plastic eyecup of the appropriate size is inserted between the lids, holding methylcellulose or normal saline coupling medium. To maximize the detection of the reflected signal, the transducer should be oriented so that the scanning ultrasound beam strikes the target surface perpendicularly. In the normal eye, the cornea, anterior chamber, posterior chamber, iris, ciliary body, and anterior lens surface can be recognized easily (Fig. 1). The scleral spur is the only constant landmark allowing one to interpret UBM images in terms of the morphologic status of the anterior chamber angle and is the key for analyzing angle pathology. ...

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“…Contudo, vegetais, vidro e outros materiais também podem estar presentes (2) . A correta localização de corpos estranhos intraoculares é essencial para o planejamento terapêutico (3,4) .Dependendo da composição dos corpos estranhos, pode haver urgência de sua remoção. Materiais como ferro e cobre são tóxicos e estimulam o processo inflamatório.…”

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Avaliação de corpos estranhos no segmento anterior com ultrassonografia biomicroscópica

Moura¹,

Hayashi²,

Rocha³

et al. 2012

Arq. Bras. Oftalmol.

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INTRODUÇÃOO traumatismo ocular é a causa mais importante de perda visual no mundo, sendo um problema de saúde pública que se deve prevenir (1) . Os acidentes com corpos estranhos são mais comuns em atividades que envolvem o manuseio de metais. Contudo, vegetais, vidro e outros materiais também podem estar presentes (2) . A correta localização de corpos estranhos intraoculares é essencial para o planejamento terapêutico (3,4) .Dependendo da composição dos corpos estranhos, pode haver urgência de sua remoção. Materiais como ferro e cobre são tóxicos e estimulam o processo inflamatório. Vegetais predispõem ao risco de infecção, portanto, devem ser removidos com presteza. Substâncias inertes, como vidro e plástico, podem ser bem toleradas pelo organismo (5) . A presença de corpos estranhos pode limitar ou impedir a visibilidade das estruturas oculares (5) . A ultrassonografia biomicroscópica (UBM) possui boa resolução para avaliar o segmento anterior (6)(7)(8)

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Ultrasound biomicroscopic localization and evaluation of intraocular foreign bodies

Cited by 22 publications

References 13 publications

Ultrasound biomicroscopic evaluation of the traumatized eyes

Ultrasound biomicroscopic evaluation of the traumatized eyes

Anterior segment imaging: ultrasound biomicroscopy

Avaliação de corpos estranhos no segmento anterior com ultrassonografia biomicroscópica

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