Testing the transmit and receive functionality of the OCRA Tabletop MRI System

Hello OCRA and Tabletop community, In this blog I will guide you on how to test the RF functionality of the OCRA Tabletop MRI System. We will test the functionality for receiving RF spin signals (RX) and transmiting RF pulses (TX). For the tests you need a pickup loop coil. The coil can be build…

RF-Coil for the OCRA Tabletop MRI system

Hello OCRA and Tabletop community, In this short blog I will share my radiofrequency (RF) -coil design for our OCRA Tabletop MRI system. The coil is a simple solenoid design. To make it sensitive to the measurement (Larmor) frequency it is built as an electrical resonator with parallel capacitance. To match its impedance to a…

Transmit-Receive Switch for the OCRA Tabletop MRI system

Hello OCRA and Tabletop Community, In this blog I will share my Transmit-Receive (TR) switch design for our OCRA Tabletop MRI system. As it’s a general design, it also can be used for small RF-power applications in other MRI systems. The TR-switch is used to connect the RF-coil (antenna) to the RF Power-Amplifier (RFPA) in…

OCRA1 – SPI controlled 4 channel 18bit DAC and RF Attenuator

Hello OCRA Community, I would like to introduce you to one of the core elements of our OCRA Tabletop MRI console, the OCRA1. It’s a peripheral printed circuit board (PCB) that extends a Red Pitaya to a basic MRI console. All its components are controlled with the Serial Peripheral Interface (SPI) bus given by the…