Cristina Utrilla1, Javier Gavilán2, Pilar García-Raya1, Miryam Calvino2,3, Luis Lassaletta4,5. 1. Department of Radiology, La Paz University Hospital, Madrid, Spain. 2. Department of Otorhinolaryngology, La Paz University Hospital, IdiPAZ Research Institute, Paseo de la Castellana, 261, 28046, Madrid, Spain. 3. Biomedical Research Networking Centre on Rare Diseases (CIBERER-U761), Institute of Health Carlos III, Madrid, Spain. 4. Department of Otorhinolaryngology, La Paz University Hospital, IdiPAZ Research Institute, Paseo de la Castellana, 261, 28046, Madrid, Spain. luikilassa@yahoo.com. 5. Biomedical Research Networking Centre on Rare Diseases (CIBERER-U761), Institute of Health Carlos III, Madrid, Spain. luikilassa@yahoo.com.
Abstract
PURPOSE: Analysis of head magnetic resonance images (MRI) of patients with active bone conduction implants (BCIs) is challenging. Currently, there are two generations of the transcutaneous Bonebridge system (BCI601 and BCI602), the main difference between them being the transducer design and thickness. The aim was to compare the effect of transducer placement and artifact reduction sequences on legibility of MRI scans. METHODS: Four Thiel-fixed human head specimens were used: BCI601 was implanted in sinodural and middle fossa placement, and BCI602 in middle fossa and retrosigmoid approach. Images were obtained with a Signa® 1.5T MR. A metal artifact reduction sequence known as MAVRIC (multiacquisition variable-resonance image combination) was used. Each specimen was scanned using standard axial T2 SE and compared with axial MAVRIC artifact reduction sequences. RESULTS: Qualitatively, limits of the artifact produced by the implant were better defined with MAVRIC than with standard T2 sequences. Assessment of contralateral internal auditory canal (IAC) was possible in all cases. Placement of the BCI602 in the middle fossa allowed the view of the ipsilateral IAC using MAVRIC sequence. Quantitatively, the artifact was reduced with MAVRIC sequence from 6.3 to 59.7%, depending on the position of implant and model; the middle fossa placement and the BCI602 being those generating shorter artifact radio. CONCLUSION: Artifact optimized sequences as MAVRIC reduce the artifact caused by the Bonebridge system. The middle fossa approach allows a better visualization of IAC canal in the ipsilateral ear with both implant versions, but the effect is more prominent with the BCI602.
PURPOSE: Analysis of head magnetic resonance images (MRI) of patients with active bone conduction implants (BCIs) is challenging. Currently, there are two generations of the transcutaneous Bonebridge system (BCI601 and BCI602), the main difference between them being the transducer design and thickness. The aim was to compare the effect of transducer placement and artifact reduction sequences on legibility of MRI scans. METHODS: Four Thiel-fixed human head specimens were used: BCI601 was implanted in sinodural and middle fossa placement, and BCI602 in middle fossa and retrosigmoid approach. Images were obtained with a Signa® 1.5T MR. A metal artifact reduction sequence known as MAVRIC (multiacquisition variable-resonance image combination) was used. Each specimen was scanned using standard axial T2 SE and compared with axial MAVRIC artifact reduction sequences. RESULTS: Qualitatively, limits of the artifact produced by the implant were better defined with MAVRIC than with standard T2 sequences. Assessment of contralateral internal auditory canal (IAC) was possible in all cases. Placement of the BCI602 in the middle fossa allowed the view of the ipsilateral IAC using MAVRIC sequence. Quantitatively, the artifact was reduced with MAVRIC sequence from 6.3 to 59.7%, depending on the position of implant and model; the middle fossa placement and the BCI602 being those generating shorter artifact radio. CONCLUSION: Artifact optimized sequences as MAVRIC reduce the artifact caused by the Bonebridge system. The middle fossa approach allows a better visualization of IAC canal in the ipsilateral ear with both implant versions, but the effect is more prominent with the BCI602.
Authors: Joanna Walton; Neil P Donnelly; Yu Chuen Tam; Ilse Joubert; Juliette Durie-Gair; Cay Jackson; Richard A Mannion; James R Tysome; Patrick R Axon; Daniel J Scoffings Journal: Otol Neurotol Date: 2014-06 Impact factor: 2.311
Authors: Javier Gavilan; Oliver Adunka; Sumit Agrawal; Marcus Atlas; Wolf-Dieter Baumgartner; Stefan Brill; Iain Bruce; Craig Buchman; Marco Caversaccio; Marc T De Bodt; Meg Dillon; Benoit Godey; Kevin Green; Wolfgang Gstoettner; Rudolf Hagen; Abdulrahman Hagr; Demin Han; Mohan Kameswaran; Eva Karltorp; Martin Kompis; Vlad Kuzovkov; Luis Lassaletta; Yongxin Li; Artur Lorens; Jane Martin; Manikoth Manoj; Griet Mertens; Robert Mlynski; Joachim Mueller; Martin O'Driscoll; Lorne Parnes; Sasidharan Pulibalathingal; Andreas Radeloff; Christopher H Raine; Gunesh Rajan; Ranjith Rajeswaran; Joachim Schmutzhard; Henryk Skarzynski; Piotr Skarzynski; Georg Sprinzl; Hinrich Staecker; Kurt Stephan; Serafima Sugarova; Dayse Tavora; Shin-Ichi Usami; Yuri Yanov; Mario Zernotti; Patrick Zorowka; Paul Van de Heyning Journal: Acta Otolaryngol Date: 2015-07-29 Impact factor: 1.494
Authors: Katarzyna B Cywka; Piotr H Skarzynski; Bartlomiej Krol; Stavros Hatzopoulos; Henryk Skarzynski Journal: Eur Arch Otorhinolaryngol Date: 2022-02-19 Impact factor: 3.236