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Minim Invasive Neurosurg 2004; 47(5): 284-289
DOI: 10.1055/s-2004-830094
Original Article
© Georg Thieme Verlag Stuttgart · New York

Functional Neurosurgery in the MRI Environment

A.  A. F.  De Salles1 , L.  Frighetto1 , E.  Behnke1 , S.  Sinha2 , L.  Tseng1 , R.  Torres1 , M.  Lee1 , C.  Cabatan-Awang1 , R.  Frysinger3
  • 1Division of Neurosurgery, School of Medicine, University of California, Los Angeles, CA, USA
  • 2Division of Radiology, School of Medicine, University of California, Los Angeles, CA, USA
  • 3Division of Neurobiology, School of Medicine, University of California, Los Angeles, CA, USA
Further Information

Publication History

Publication Date:
31 March 2005 (online)

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Abstract

Objective: The purpose of this study was to evaluate the feasibility of microelectrode recording, electrical stimulation, and electrode position checking during functional neurosurgical procedures (DBS, lesion) in the interventional magnetic resonance imaging (iMRI) environment.

Methods: Seventy-six surgical procedures for DBS implant or radiofrequency lesion were performed in an open 0.2 T MRI operating room. DBS implants were performed in 54 patients (72 surgical procedures) and unilateral radiofrequency lesions in three for a total of 76 surgeries in 57 patients. Electrophysiological studies including macrostimulation and microelectrode recordings for localization were obtained in the 0.5 to 10 mT fringes of the magnetic field in 51 surgeries. MRI confirmation of the electrode position during the procedure was performed after electrophysiological localization.

Results: The magnetic field associated with the MRI scanner did not contribute significant noise to microelectrode recordings. Anatomical confirmation of electrode position was possible within the MRI artifact from the DBS hardware. Symptomatic hemorrhage was detected in two (2.6 %) patients during the operation. Image quality of the 0.2 T MRI scan was sub-optimal for anatomical localization. However, image fusion with pre-operative scans permitted excellent visualization of the DBS electrode tip in relation to the higher quality 1.5 T MRI anatomical scans.

Conclusion: This study shows that conventional stereotactic localization, microelectrode recordings, electrical stimulation, implant of DBS hardware, and radiofrequency lesion placement are possible in the open 0.2 T iMRI environment. The convenience of having an imaging modality that can visualize the brain during the operation is ideal for stereotactic procedures.

Key words

Deep brain stimulation - globus pallidum - interventional magnetic resonance imaging - subthalamic nucleus - thalamus

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Antonio A. F. De SallesM. D., Ph. D. 

200 UCLA Medical Plaza

Suite 504

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CA 90095-7182

USA

Phone: +1-310-794-1221

Fax: +1-310-794-1848

Email: adesalles@mednetucla.edu