Tech Primer
MRI (Magnetic Resonance Imaging) is a bio-magnetic spin imaging technology. When any part of a human body is put simultaneously in a powerful magnetic field and another gradient magnetic field that is changing rapidly, the hydrogen atoms in the body can be forced into a particular alignment (resonance) by an additional electromagnetic wave at a certain frequency. By analyzing and processing the electromagnetic wave released from those atoms, a precise image of body tissue can be generated.
Selection of the devices for signal receiving channel is critical for achieving the high-quality images. To amplify the small RF signals from RF coils, it is necessary to have a Low Noise Amplifier with low voltage noise density, high-bandwidth, and high SNR. An ADC featured with high resolution, high sample rate, high bandwidth, and high dynamic performance is also a favorable option for the A-D conversion of signals.
For signal post-processing, image reconstruction, as well as generation of pulse signals and timing control, a combination of high performance FPGA, DSP and MCU should be an ideal solution. To control the gradient magnetic field that is changing rapidly and generate the electromagnetic wave at a certain frequency, selecting a high-resolution and high-speed DAC is necessary.
At present, the well-known semiconductor companies around the world such as ADI, TI, can provide the solutions for MRI. Other semiconductor manufacturers like Maxim, Freescale, and Altera also can provide some relevant devices.
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