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MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges

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Magnetically programmable shunt valve: MRI at 3-Tesla.

Frank G Shellock¹, Stephen F Wilson, Christophe P Mauge

¹Keck School of Medicine, University of Southern California, Los Angeles, CA, USA. frank.shellock@gte.net

Magnetic Resonance Imaging

|August 21, 2007

Summary

This study found that the Codman Hakim Programmable Valve for cerebrospinal fluid (CSF) shunts is safe for 3-Tesla MRI. While some reprogramming may be needed, the valve

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Area of Science:

Neurosurgery
Medical Device Safety
Radiology

Background:

Cerebrospinal fluid (CSF) shunts are crucial for managing hydrocephalus.
Programmable valves offer adjustable flow rates but raise safety concerns in MRI environments.
Assessing MRI compatibility is vital for patient safety and treatment continuity.

Purpose of the Study:

To evaluate the safety and performance of a magnetically programmable CSF shunt valve during 3-Tesla MRI.
To determine potential risks including magnetic interactions, heating, image artifacts, and functional changes.
To establish guidelines for MRI use in patients with this type of shunt.

Main Methods:

The Codman Hakim Programmable Valve was subjected to 3-Tesla MRI conditions.
Evaluated parameters included magnetic field interactions, temperature changes, image artifact generation, and valve setting alterations.
Multiple MRI exposures under various conditions were performed.

Main Results:

The valve exhibited minor magnetic field interactions and minimal heating (+0.4°C).
Significant image artifacts were observed relative to the valve's size, potentially impacting nearby imaging areas.
Some valves required reprogramming after MRI exposure, but function remained unaffected long-term.

Conclusions:

The magnetically programmable CSF shunt valve is acceptable for 3-Tesla MRI when safety guidelines are followed.
Key considerations include potential for valve reprogramming and managing image artifacts.
Adherence to specific protocols ensures patient safety and maintains shunt functionality.