MRI dynamic range and its compatibility with signal transmission media

Area of Science:

• Medical Imaging
• Biophysics
• Electrical Engineering

Background:

• Increasing MRI phased array coil elements cause problematic cable interactions.
• Fiber optic or wireless links reduce interference but have lower dynamic range (DR) than coaxial cables.
• Raw MRI signals possess high DR due to k-space center signal amplitude.

Purpose of the Study:

• To investigate MRI dynamic range (DR) for assessing non-coaxial cable transmission compatibility.
• To develop an improved method for estimating MRI signal DR from magnitude images.
• To evaluate the suitability of current non-coaxial technologies for MRI data transmission.

Main Methods:

• Studied DR in MRI signals to determine compatibility with non-coaxial transmission.
• Developed a novel method to estimate MRI signal DR from conventional magnitude images.
• Measured DR for various coil arrays (surface, cardiac, spine, head) at 3T.

Main Results:

• Typical surface coil signals at 3T have a DR < 88 dB.
• Cardiac and spine coil arrays showed DR < 75 dB; head coil arrays < 88 dB.
• Estimated DR from magnitude images closely matched raw data measurements.

Conclusions:

• Current analog fiber optic links (60-70 dB DR) are insufficient alone for transmitting MRI data from high-DR coils (~90 dB).
• Non-coaxial cable transmission may become feasible by integrating analog links with signal compression techniques.
• Further research into signal processing and hardware is needed to overcome DR limitations in MRI data transmission.