PMID- 28238561
OWN - NLM
STAT- MEDLINE
DCOM- 20180403
LR  - 20220331
IS  - 1878-4119 (Electronic)
IS  - 1010-5182 (Linking)
VI  - 45
IP  - 4
DP  - 2017 Apr
TI  - Magnetic resonance imaging of the inferior alveolar nerve with special regard to 
      metal artifact reduction.
PG  - 558-569
LID - S1010-5182(17)30020-3 [pii]
LID - 10.1016/j.jcms.2017.01.009 [doi]
AB  - PURPOSE: Magnetic resonance imaging (MRI) is an excellent imaging modality for 
      displaying peripheral nerves. Since the knowledge about MRI of the inferior 
      alveolar nerve (IAN) is limited, this pilot study aims to identify the prospects 
      and limitations of MRI of the IAN, with special consideration of metal artifacts. 
      MATERIALS AND METHODS: Initially, in vitro MRI of a dental implant was performed 
      to establish an optimized protocol for metal artifact reduction using WARP 
      sequences (a software package provided by Siemens Healthcare, Erlangen, Germany) 
      including view angle tilting (VAT) and slice-encoding metal artifact correction 
      (SEMAC) techniques. MRI with this optimized protocol was performed in three 
      volunteers and four patients presenting with postoperative IAN impairment. 
      Measuring the evaluable area and the artifact size was performed to assess the 
      benefit of the specific artifact reduction sequences. RESULTS: In vitro imaging 
      of a dental implant demonstrated that WARP sequences with VAT and SEMAC 
      techniques led to a volume reduction of the artifact of up to 69.1%. Observations 
      in both volunteers and patients with neurosensory IAN impairment showed a 
      distinct artifact reduction with the MRI protocol adapted to metallic materials. 
      Additionally VAT and SEMAC techniques improved the imaging due to further 
      artifact reduction. As a main drawback of the VAT technique, the image quality 
      was compromised by a blurring effect. Still, on 3-T MRI the resolution was high 
      enough to reveal even fine structures. Imaging of the IAN was successful in all 
      cases despite metallic material in the region of interest, and structural IAN 
      changes could be detected in correlation with clinical symptoms. CONCLUSION: In 
      contrast to conventional radiography and computed tomography, MRI can directly 
      depict the IAN and provide reliable information on its position and exact course 
      within the mandible. MRI offers an objective assessment of IAN injuries, 
      supporting the decision-making process regarding surgical exploration and 
      microneural repair. With the advent of specialized MRI techniques such as VAT and 
      SEMAC, reduction of metal artifacts is considerably improved.
CI  - Copyright (c) 2017 European Association for Cranio-Maxillo-Facial Surgery. 
      Published by Elsevier Ltd. All rights reserved.
FAU - Probst, Monika
AU  - Probst M
AD  - Department of Diagnostic and Interventional Neuroradiology (Head: Prof. C. 
      Zimmer), Klinikum rechts der Isar, Technical University Munich, Ismaninger Strasse 
      22, 81675, Munich, Germany. Electronic address: monika.probst@tum.de.
FAU - Richter, Vivien
AU  - Richter V
AD  - Department of Diagnostic and Interventional Radiology, University Hospital 
      Tuebingen, Eberhard Karls University Tuebingen, Hoppe-Seyler-Strasse 3, 72076, 
      Tuebingen, Germany.
FAU - Weitz, Jochen
AU  - Weitz J
AD  - Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical 
      University Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
FAU - Kirschke, Jan Stefan
AU  - Kirschke JS
AD  - Department of Diagnostic and Interventional Neuroradiology (Head: Prof. C. 
      Zimmer), Klinikum rechts der Isar, Technical University Munich, Ismaninger Strasse 
      22, 81675, Munich, Germany.
FAU - Ganter, Carl
AU  - Ganter C
AD  - Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, 
      Ismaninger Strasse 22, 81675, Munich, Technical University Munich, Germany.
FAU - Troeltzsch, Matthias
AU  - Troeltzsch M
AD  - Department of Oral and Maxillofacial Surgery, Ludwig Maximilians University of 
      Munich, Lindwurmstrasse 2a, 80337, Munich, Germany.
FAU - Nittka, Mathias
AU  - Nittka M
AD  - Siemens AG, Healthcare Sector, Allee am Roethelheimpark 2, 91052, Erlangen, 
      Germany.
FAU - Cornelius, Carl-Peter
AU  - Cornelius CP
AD  - Department of Oral and Maxillofacial Surgery, Ludwig Maximilians University of 
      Munich, Lindwurmstrasse 2a, 80337, Munich, Germany.
FAU - Zimmer, Claus
AU  - Zimmer C
AD  - Department of Diagnostic and Interventional Neuroradiology (Head: Prof. C. 
      Zimmer), Klinikum rechts der Isar, Technical University Munich, Ismaninger Strasse 
      22, 81675, Munich, Germany.
FAU - Probst, Florian Andreas
AU  - Probst FA
AD  - Department of Oral and Maxillofacial Surgery, Ludwig Maximilians University of 
      Munich, Lindwurmstrasse 2a, 80337, Munich, Germany.
LA  - eng
PT  - Journal Article
DEP - 20170125
PL  - Scotland
TA  - J Craniomaxillofac Surg
JT  - Journal of cranio-maxillo-facial surgery : official publication of the European 
      Association for Cranio-Maxillo-Facial Surgery
JID - 8704309
RN  - 0 (Dental Implants)
RN  - 0 (Metals)
SB  - IM
MH  - *Artifacts
MH  - *Dental Implants
MH  - Humans
MH  - In Vitro Techniques
MH  - *Magnetic Resonance Imaging
MH  - Mandibular Nerve/*diagnostic imaging
MH  - Metals
MH  - Pilot Projects
OTO - NOTNLM
OT  - Inferior alveolar nerve
OT  - MRI
OT  - Metal artifact reduction
OT  - SEMAC
OT  - VAT
OT  - View-angle tilting
EDAT- 2017/02/28 06:00
MHDA- 2018/04/04 06:00
CRDT- 2017/02/28 06:00
PHST- 2016/03/23 00:00 [received]
PHST- 2016/12/08 00:00 [revised]
PHST- 2017/01/09 00:00 [accepted]
PHST- 2017/02/28 06:00 [pubmed]
PHST- 2018/04/04 06:00 [medline]
PHST- 2017/02/28 06:00 [entrez]
AID - S1010-5182(17)30020-3 [pii]
AID - 10.1016/j.jcms.2017.01.009 [doi]
PST - ppublish
SO  - J Craniomaxillofac Surg. 2017 Apr;45(4):558-569. doi: 10.1016/j.jcms.2017.01.009. 
      Epub 2017 Jan 25.