Gradyan dizi sistemlerine yönelik modüler spektrometre mimarileri

Gradient arrays are gaining popularity in the magnetic resonance imaging (MRI) community due to their superior performance and flexibility compared to conventional gradient coils. The technology can be used to excite multiple slices simultaneously, mitigate the B1+ inhomogeneity, reduce the power loss on the cryostat, and increase peripheral nerve stimulation (PNS) thresholds. However, despite their potential, fully standalone MRI systems based on gradient arrays are yet to be realized. With an increasing number of channels, scalable design methodologies become essential to resolve the hardware complexity. In this thesis, we present the development of modular spectrometer architectures for gradient array coils and parallel radio frequency (RF) transmit arrays to work towards a fully standalone gradient array magnetic resonance imaging system. Building upon previous work, the spectrometer submodules are implemented entirely on field programmable gate array (FPGA) hardware and consist of three main subsystems: a sequence parser, a gradient controller, and an RF controller. The sequence parser reads PulSeq-formatted conventional sequences and converts them into hardware-compatible memory structures. The gradient controller accesses these memory-mapped sequences and generates time-resolved gradient amplitudes, which are projected onto array channels and sent to an external driver chain. Lastly, the RF controller synthesizes a carrier clock and drives external RF power amplifiers using pulse-width-modulated (PWM) envelope signals. Unlike traditional RF synthesizers that rely on digital-to-analog converters (DACs) or mixers, the RF clock is generated entirely using FPGA primitives, simplifying the overall architecture and reducing scaling costs.