A Special Surface Coil for High-Resolution Ocular MRI1

Hosten, Norbert; Lemke, A.

doi:10.1159/000425684

Cited by 7 publications

(6 citation statements)

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“…The new device is suited to detection of very small lesions in the eye with a thickness of less than 1 mm. 26 Standard techniques using surface coils with a field of view between 12 and 16 cm and a slice thickness of 3 mm allowed detection of intraocular lesions not smaller than 1.8 mm. 27 With an in-plane resolution of 0.8 mm, fast spin echo MR imaging of the eye, with the new specialised surface coil, is a reliable technique to visualise smaller intraocular retinoblastomas.…”

Section: Discussionmentioning

confidence: 99%

High resolution magnetic resonance imaging of retinoblastoma

Schueler

Hosten²,

Bechrakis³

et al. 2003

British Journal of Ophthalmology

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Background/aims: Diagnosis of retinoblastoma is mainly based on indirect ophthalmoscopy, but additional imaging techniques are indispensable for the staging of the disease. A new high resolution magnetic resonance imaging (MRI) technique for the examination of the eye was evaluated. A new surface coil with a diameter of 5 cm allows a field of view of 60 mm with an in-plane resolution of 0.8 mm. We compared preoperative MRI scans with the histology after enucleation in 21 cases of retinoblastoma. Parameters studied were appearance of retinoblastoma, choroidal and scleral infiltration, extraocular extension, optic nerve infiltration, and vitreous seeding. Results: All retinoblastomas could be visualised as hypointense to vitreous on T2 weighted images and slightly hyperintense to vitreous on plain T1 weighted images with a moderate enhancement after contrast application. Histology revealed seven cases with infiltration of the optic disc or optic nerve. Preoperative MRI scans depict juxtapapillary tumour masses, but it was impossible to differentiate between a juxtapapillary retinoblastoma, a prelaminar infiltration of the optic disc, or a just postlaminar optic nerve infiltration. In five of 14 cases with a proved tumour infiltration of the choroid, MRI scans showed an inhomogeneous contrast enhancement of the choroid in enhanced T1 weighted sequences beneath the retinoblastoma. Whether this sign is specific for a choroidal infiltration or is just an artefact remains unclear. High resolution MRI scans did not allow the exclusion of this form of intraocular tumour extension. All nine cases with proved vitreous seeding were not detected by MRI scans. None of these cases showed scleral infiltration or orbital tumour extension. Therefore, it is not possible to judge the rank of this technique in detecting orbital tumour growth. Conclusion:The new MRI technique is of limited value in visualisation of prelaminar or postlaminar infiltration of the optic nerve. Advanced choroidal infiltration might be visualised by contrast enhanced T1 weighted MRI scans, but the available spatial resolution did not allow the exclusion this critical form of tumour growth by MRI scans. Nevertheless, high resolution MRI with the new surface coil has superior contrast and spatial resolution compared to computed tomograph (CT) or other available imaging techniques. MRI cannot replace CT in detecting tumour calcification but with increasing experience with this new technique it should be possible to renounce CT scans in the majority of cases of retinoblastoma.

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Section: Discussionmentioning

confidence: 99%

High resolution magnetic resonance imaging of retinoblastoma

Schueler

Hosten²,

Bechrakis³

et al. 2003

British Journal of Ophthalmology

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“…John-Mikolajewski stated CT as being unable to depict infiltrations of the optic nerve [18], whereas another study group was able to evaluate infiltrations of the optic nerve using high resolution CT with a slice thickness of 1.5 mm and IV application of contrast medium [19]. Contrast enhancement in MRI is a sign for infiltration of the optic nerve, previously demonstrated in optic nerve infiltration of choroidal melanomas [20] and confirmed by the findings of Barkhof and Ainbinder [21,22]. The results from the present study (sensitivity of 53.8%) and the results from the literature (sensitivity of up to 75%) are not satisfactory so far [4], but thin slice imaging of the optic nerve region provides further potential in MRI diagnostics.…”

Section: Detection Of Optic Nerve and Choroidal Infiltrationmentioning

confidence: 99%

Retinoblastoma—MR appearance using a surface coil in comparison with histopathological results

Kazi

Mergner

et al. 2006

Eur Radiol

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“…Surface coils with a small diameter should be used to detect small pathologies in the superficial parts of the orbit. Since these coils were developed for eye imaging, they are called "globe coils" and have a diameter of 4-6 cm [6][7][8]. High-resolution imaging with a high signal-to-noise ratio is possible with these coils and optimized sequences.…”

Section: Mri In Orbital Diagnosismentioning

confidence: 99%

“…Imaging of the globe has two principal applications: differential diagnosis and noninvasive tumor staging. A small-surface coil is indispensable for proper examination with MRI because of the required high spatial resolution, fewer chemical shift artifacts, and sufficient signal-to-noise ratio [7]. In cases of tumor staging, for example, in uveal melanomas, MRI examination should begin with T1-and T2-weighted sequences.…”

Section: Lacrimal Glandmentioning

confidence: 99%

Magnetic resonance imaging of orbital tumors

Kazi

Félix

2006

Eur Radiol

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This contribution provides an overview of diseases of eye and orbit and their appearance on magnetic resonance imaging. In recent years the diagnosis of eye and orbit pathology has profited significantly from increasingly sophisticated technical developments in the field of tomographic methods. Due to the small size of the examination area the improvement in spatial resolution and soft tissue contrast leads to an increase in image quality. In most clinical questions concerning eye and orbit pathologies magnetic resonance imaging is superior to computed tomography and should be early performed.

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A Special Surface Coil for High-Resolution Ocular MRI1

Cited by 7 publications

References 0 publications

High resolution magnetic resonance imaging of retinoblastoma

High resolution magnetic resonance imaging of retinoblastoma

Retinoblastoma—MR appearance using a surface coil in comparison with histopathological results

Magnetic resonance imaging of orbital tumors

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