MRI BRAIN NAVIGATION PROTOCOL
Also Known As
Lab Test
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About The Test
Key Uses & Safety Snapshot
- Purpose: Create a detailed 3-D brain map for surgery planning, biopsy guidance, or epilepsy focus localisation.
- Technology: Uses strong magnetic fields and radio waves—no radiation.
- Safety: Non-invasive; open-bore scanner available for claustrophobic patients.
Quick Facts Table
| Parameter | Detail |
|---|---|
| Duration | 30–60 minutes |
| Radiation | Zero ionising radiation |
| Preparation | 4–6 hrs fasting if contrast used; remove all metal |
List of Parameters
- Anatomical Landmarks: Sylvian fissure, ventricles, skull base
- Functional Activation Zones: Broca’s & Wernicke’s areas, motor cortex
- Fiber Tractography Data: Corticospinal tract, optic radiations, arcuate fasciculus
Why This Test
- Pre-surgical Mapping: Know tumour borders before the first incision
- Biopsy Guidance: Target the most aggressive part of a lesion
- Epilepsy Focus Localisation: Pinpoint seizure origin for resection planning
When to Take Test
Benefits
Benefits of MRI Brain Navigation Protocol
- Precise Targeting & Reduced Surgical Risk: Fewer complications, less normal tissue removed
- Shorter Operating Time: Surgeons spend minutes, not hours, finding the lesion
- Better Patient Outcomes: Faster recovery, improved quality of life
Conditions Diagnosed by MRI Brain Protocol
- Brain Tumours & Lesions: Gliomas, meningiomas, metastases
- Vascular Malformations: AVMs, cavernomas, aneurysms
- Neurodegenerative Disorders: Early Alzheimer’s-related volume loss, multiple sclerosis plaques
Preparing for test
Pre-requisites
- Bring previous scans (CT, MRI, PET) on CD or cloud link
- Share full medical history, especially kidney disease or allergies
Best Time to Take the MRI Brain Navigation Protocol
- Ideally 1–2 weeks before planned surgery to allow surgical team planning time
Eligibility
- Pregnancy: First-trimester scans avoided unless essential
- Pacemaker: MRI-conditional devices accepted; others need cardiologist clearance
Procedure for Taking an MRI Brain Navigation Protocol
- Change into cotton gown; remove all metal.
- Lie on the scanner table; head coil placed.
- Perform simple tasks (e.g., finger tapping) if functional MRI is included.
- Contrast injection via IV if ordered (takes 10 seconds).
- Scan complete; you may leave immediately.
Caution Before Taking the Test
- Metal Objects: No jewellery, hearing aids, or hairpins
- Fasting: 4–6 hrs for contrast studies; clear fluids allowed
Test Results
Results and Interpretations
| Feature Identified/Mapped | Description/Imaging Characteristics | Significance for Surgical Navigation |
|---|---|---|
| Mass with contrast enhancement | Bright uptake after gadolinium | Likely high-grade tumour or infection |
| Reduced fibre tract integrity | DTI shows tract displacement | Tumour infiltration or oedema |
| Functional activation lateralised | Speech area on right instead of left | A typical dominance; surgical plan adjusted |
| Contrast enhancement Major Blood Vessels (Arteries and Veins) | Visualized using high-resolution MRI or MR angiography/venography; includes vessels near surgical corridor. | Identifying and preserving vessels reduces the risk of hemorrhage, stroke, or venous infarction during resection. |
| Optimal Surgical Trajectory | Integrates data from lesion, eloquent cortex, fiber tracts, and vasculature to define a safe access route. | Enables minimally invasive access while protecting functional tissue, improving surgical safety and reducing operative time. |
Risks & Limitations
MRI Safety Considerations
- Contra-indications: Pacemakers, cochlear implants, certain aneurysm clips
- Precautions: Pregnancy screening, kidney function test before contrast
Limitations in Detecting Certain Pathologies
- Very small calcified lesions may be missed
- Cannot distinguish tumour grade without biopsy
- Metal artefacts may obscure nearby structures
FAQs
How long does the scan take?
30–60 minutes, depending on the sequences required.
Is contrast injection always required?
No. It’s used only when tumour or vascular detail is needed.
Can children undergo this protocol?
Yes. Paediatric coils and sedation options are available.
What if I am claustrophobic?
We offer an open-bore 70 cm scanner and mild sedation on request.
When will reports be ready?
Within 24 hours; urgent cases within 2 hours.
When will my surgeon use these images?
The images and data from your MRI Brain Navigation Protocol are processed shortly after your scan is completed. Your neurosurgeon will then use this detailed 3D map to meticulously plan the surgical approach. During the actual operation, these images are loaded into a neuronavigation system, which your surgeon uses in real-time to guide their instruments, effectively providing a "GPS for the brain." This is how neuronavigation MRI guides surgery to achieve optimal results.