Low Field set-up for Magnetic Resonance Imaging

The measurement system consists of three main components. The magnetic sensor is realized by using a superconducting quantum interference device. To apply all the required magnetic fields and field gradients a coil set-up is placed inclusive current sources. And, a PXI based data acquisition and timing completes the set-up. Each measurement starts with a pre-polarizing of sample volume by applying up to 50 mT. To get the spatial information phase and frequency encoding is used. After the polarization the phase gradient is applied for adjustable time. Then the applied frequency gradient and detection field are inversed repetitively according to the phase time. So, echo signals of samples T2 decrease can be measured.