Case Studies
Handheld Analyzer Improves MRI Performance
Magnetic Resonance Imaging (MRI) helps healthcare professionals quickly uncover problems inside a patient’s body through use of high-power magnetic fields. To produce these large magnetic fields, the MRI coils are driven using high voltage (several kilovolts) and high current (hundreds of amps) requiring regular maintenance. Specifically, the RF coil inside the MRI must be tuned for impedance matching and RF leakage. If this step is not done, or done improperly, the result is often noisy scanned images with poor contrast. One Japanese medical equipment company found itself regularly confronting the challenge of servicing its MRI machines. To do that, its technicians had to drag a benchtop vector network analyzer (VNA) into hospitals to conduct the needed MRI RF coil tuning process. Without a power socket in the MRI room, the only way to perform that process was to have the instrument powered through a power socket in another room and a coaxial BNC cable connected to the back of the MRI machine. It was complicated and limited by the reach of the benchtop machine. For every maintenance cycle, the technician would set this up then go back and forth between the instrument and the MRI machine to adjust the coils, because the instrument had to be far enough away from the MRI machine’s magnetic field when measurements were made. To solve these challenges, the company found a solution with Keysight’s FieldFox handheld RF and microwave analyzer. In high-power RF environments such as a hospital, analyzer equipment needs to provide some basic critical features, such as:
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