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Effect of Implant Position on Magnetic Resonance Image Distortion

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02246231
Recruitment Status : Completed
First Posted : September 22, 2014
Last Update Posted : March 17, 2020
Information provided by (Responsible Party):
Manchester University NHS Foundation Trust

Brief Summary:

Patients with Neurofibromatosis type 2 (NF2) almost always develop acoustic neuromas in both ears. As a result of the tumours themselves or the treatment of the tumours, many patients become profoundly deaf in both ears. It is possible to restore a degree of hearing by placing a hearing implant in the brainstem adjacent to the hearing pathways within the brain. This is termed an auditory brainstem implant (ABI).

The aim of this study is to find the optimum head position in relation to the MRI magnet field, which would produce least area of image distortion in patients with ABIs. This will be of benefit in optimising the MR imaging in future patients with implants.

Condition or disease Intervention/treatment Phase
Neurofibromatosis Type 2 Device: MR imaging Not Applicable

Detailed Description:

Auditory brainstem implants (ABI) are placed against the auditory centres in the brainstem if it is not possible to implant the cochlea or if the cochlear nerve, which conveys neural signals from the cochlea to the brainstem, is damaged or absent. The latter device is usually used in patients with Neurofibromatosis type 2 (NF2) who develop bilateral benign inner ear tumours called vestibular schwannomas as well as other neurological tumours1. These patients often become bilaterally profoundly deaf either as a result of the disease or because of surgery to remove the tumours and require an ABI.

Patients with NF2 require monitoring of their tumours. In the absence of an auditory implant it is possible to use magnetic resonance imaging. This is the gold standard imaging technique as it gives excellent views of the soft tissues of head. However, there has been concern regarding the use of MRI in patients with auditory implants until recently because of potential problems such as demagnetisation of the magnet within the implant, implant magnet displacement and risk to the integrity of the implant electronics. In addition, the magnet field of the implant magnet results in imaging artefact (manifesting as a signal void) around the implant site that limits the information that can be obtained.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 5 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: The Effect of Changes in Head Position on Magnetic Resonance Image Distortion in Patients With Auditory Implants
Actual Study Start Date : February 3, 2014
Actual Primary Completion Date : January 31, 2015
Actual Study Completion Date : January 31, 2015

Arm Intervention/treatment
Experimental: NF2 who has an auditory implant Device: MR imaging

Primary Outcome Measures :
  1. To study the effect of magnet orientation in auditory brainstem implants/ cochlear implants in determining the size of signal void seen on MRI scanning. [ Time Frame: 1 year ]

Secondary Outcome Measures :
  1. To identify if there is an angle at which the signal void is minimised [ Time Frame: 1 year ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

- Any patient over the age of 18 with NF2 who has an auditory implant (cochlear or auditory brainstem implant) in situ and requires MRI scanning.

Exclusion Criteria:

Children under the age of 18 years Claustrophobia Bilateral implants

Contraindications and relative contraindications for MRI (as per the Radiology Department MRI protocol) including:

Pacemaker Certain metallic heart valves Ferromagnetic implanted materials and foreign bodies

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02246231

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United Kingdom
Central Manchester University Hospitals NHS Foundation Trust
Manchester, Manchester (Manchester Borough), United Kingdom, M13 9WL
Sponsors and Collaborators
Manchester University NHS Foundation Trust
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Principal Investigator: Simon Lloyd Manchester University NHS Foundation Trust
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Responsible Party: Manchester University NHS Foundation Trust Identifier: NCT02246231    
Other Study ID Numbers: R01623
First Posted: September 22, 2014    Key Record Dates
Last Update Posted: March 17, 2020
Last Verified: March 2020
Additional relevant MeSH terms:
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Neurofibromatosis 1
Neurofibromatosis 2
Nerve Sheath Neoplasms
Neoplasms, Nerve Tissue
Neoplasms by Histologic Type
Neoplastic Syndromes, Hereditary
Neurocutaneous Syndromes
Nervous System Diseases
Heredodegenerative Disorders, Nervous System
Neurodegenerative Diseases
Genetic Diseases, Inborn
Peripheral Nervous System Diseases
Neuromuscular Diseases
Peripheral Nervous System Neoplasms
Nervous System Neoplasms
Neuroma, Acoustic
Neuroendocrine Tumors
Neuroectodermal Tumors
Neoplasms, Germ Cell and Embryonal
Vestibulocochlear Nerve Diseases
Retrocochlear Diseases
Ear Diseases
Otorhinolaryngologic Diseases
Otorhinolaryngologic Neoplasms
Cranial Nerve Neoplasms