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Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

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Magnetic Resonance Imaging Duodenoscope.

Richard R A Syms, Ian R Young, Christopher A Wadsworth

IEEE Transactions on Bio-Medical Engineering

|June 29, 2013

Summary

This study introduces a novel side-viewing duodenoscope integrating optical and magnetic resonance imaging (MRI). The device enables enhanced visualization for procedures like endoscopic retrograde cholangiopancreatography (ERCP).

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Area of Science:

Medical Imaging
Biomedical Engineering
Gastroenterology

Background:

Diagnostic imaging in gastroenterology, particularly for the biliary and pancreatic ducts, faces limitations with current endoscopic tools.
Magnetic Resonance Imaging (MRI) offers superior soft-tissue contrast but is challenging to integrate into endoscopic devices.
Developing MR-compatible endoscopic instruments is crucial for advancing minimally invasive diagnostic and therapeutic procedures.

Purpose of the Study:

To describe the design and performance of a novel side-viewing duodenoscope capable of both optical imaging and Magnetic Resonance Imaging (MRI).
To evaluate the feasibility and effectiveness of this integrated imaging system for potential use in endoscopic retrograde cholangiopancreatography (ERCP).

Main Methods:

Construction of a side-viewing duodenoscope using MR-compatible materials, incorporating a fiber optic bundle, irrigation and biopsy channels, and a specialized tip saddle coil for MRI signal reception.
Implementation of intrinsic safety features via magnetic coupling, impedance matching with a variable mutual inductance, and active decoupling using PIN-diode switching.
Performance evaluation through 1H MRI of phantoms and ex vivo porcine liver specimens at 1.5 T.

Main Results:

The duodenoscope successfully acquired a suitable MRI field-of-view for ERCP applications with minimal artifacts.
The integrated MRI system demonstrated a signal-to-noise ratio advantage compared to a conventional surface array coil.
The device's MR-compatible construction and safety features were validated.

Conclusions:

A novel MR-compatible side-viewing duodenoscope integrating optical and MRI capabilities has been successfully developed.
This innovative instrument shows promise for enhancing diagnostic accuracy and procedural guidance in ERCP and related gastrointestinal interventions.
The demonstrated performance suggests a significant advancement in endoscopic imaging technology.