A Control Unit for a Magnetic Particle Spectrometer

R. Marquina-Sanchez, S. Kaufmann, M. Ryschka, T.F. Sattel, T.M. Buzug


Magnetic Particle Imaging (MPI) is a quite new imaging technique, based on the non-linear magnetization behavior of superparamagnetic iron oxide nanoparticles (SPIOs). These SPIOs are applied to a patient as tracer material. An important key aspect for successful and reliable imaging is tracer development and characterization. Hence, a Magnetic Particle Spectrometer (MPS) is needed to perform extensive studies about the SPIOs dynamic magnetization behavior. The MPS hardware build-up consists mainly of a drive coil, a receive coil, a cooling circuit, amplifiers and a control unit. This paper proposes a new self-contained control unit hardware system based on a System-On-Chip (SoC) Field-Programmable- Gate-Array (FPGA). The control unit controls, collects, and maintains data acquisition, coil excitations and the behavior of the cooling circuit in realtime. The SoC is also able to pre-process measurement data (i.e. filtering, averaging, up- and down-sampling etc.). The generation of the magnetic field in the drive coil is controlled by a 14 bit Digital/Analog Converter (DAC) coupled with an external amplifier. The receive coil signal is amplified and digitalized via a 14 bit Analog/Digital Converter (ADC). To prevent system overheating, also temperature is supervised and kept under certain limits. For that purpose four Resistive Thermal Devices (RTDs) in combination with a cooling unit are utilized. The transmission of measurement data is realized via USB 2.0 with up to 40 MByte/s. The USB link can also be used to setup the control unit and as power supply for the self-containing SoC.
Original languageEnglish
Title of host publicationMagnetic Particle Imaging
EditorsThorsten M. Buzug, Jörn Borgert
Number of pages4
PublisherSpringer Berlin Heidelberg
Publication date2012
ISBN (Print)978-3-642-24132-1
ISBN (Electronic)978-3-642-24133-8
Publication statusPublished - 2012
Event2th International Workshop on Magnetic Particle Imaging (IWMPI 2012) - Lübeck, Germany
Duration: 15.03.201216.03.2012


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