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Cortical Activation Through Passive-Motion Functional MRI.

A F Choudhri1, R M Patel2, A Siddiqui3

  • 1From the Departments of Radiology (A.F.C., A.S., M.T.W.) Neurosurgery (A.F.C.) Le Bonheur Neuroscience Institute (A.F.C., A.S., M.T.W., J.W.W.), Le Bonheur Children's Hospital, Memphis, Tennessee achoudhri@uthsc.edu.

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|August 1, 2015
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Summary
This summary is machine-generated.

Passive-motion functional MRI (fMRI) successfully mapped brain activity in anesthetized patients, offering a vital tool for neurosurgical planning, especially for pediatric cases requiring epilepsy or tumor surgery.

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Area of Science:

  • Neuroimaging
  • Neurosurgery
  • Functional Magnetic Resonance Imaging (fMRI)

Background:

  • Functional brain mapping is crucial for neurosurgical planning, particularly for tumors and epilepsy.
  • Traditional methods are invasive, and existing noninvasive techniques demand patient compliance, posing challenges for pediatric populations.
  • Passive-motion fMRI offers a potential noninvasive alternative for patients unable to cooperate with standard functional measures.

Purpose of the Study:

  • To evaluate the diagnostic yield of passive-motion functional MRI (fMRI) in anesthetized patients.
  • To determine the feasibility and effectiveness of this technique for neurosurgical planning.

Main Methods:

  • A retrospective review of patients undergoing passive-motion fMRI under general anesthesia was conducted.
  • Clinical records were analyzed to assess indications for fMRI, detection of cortical activation, and localization of activation.
  • Data from 56 patients (62 studies) over 2.5 years were included.

Main Results:

  • Passive-motion fMRI successfully identified upper-extremity cortical activation in 88% of limbs and lower-extremity activation in 73% of limbs.
  • The majority of detected activations (86% upper-extremity, 85% lower-extremity) were in orthotopic locations.
  • Epilepsy/seizures were the most common indication for fMRI.

Conclusions:

  • Passive-motion fMRI is a successful technique for identifying cortical activation in anesthetized patients.
  • This method is easily implemented and valuable for surgical planning in pediatric patients with tumors or epilepsy, especially those unable to comply with other functional measures.