波谱学杂志2017，Vol.34Issue(3)：338-346,9.DOI:10.11938/cjmr20162533
一种用于高场MRI的多源射频发射机
A Multi-Channel Radiofrequency Transmitter for High-Field MRI
摘要
Abstract
A multi-channel parallel radiofrequency (RF) transmitter was developed for high-field magnetic resonance imaging (MRI) scanners. With a single field programmable gate array (FPGA) and a multi-channel digital analog converter (DAC), the transmitter can generate multi-channel RF pulses in parallel. The frequency, phase and amplitude of the RF pulses can be adjusted quickly and independently. The FPGA reads the parameters of the RF pulses previously stored in a dual-port random access memory (RAM), and uses them to carry out modulation and direct digital frequency synthesis (DDS) for each RF pulses, resulting in multi-channel digital RF signals. The digital signals were then converted into analog RF signals with a high-performance DAC. The use of intellectual property core provided by Xilinx greatly reduced development time, difficulty and cost in achieving the main functions of the transmitter, such as DDS and modulation. The developed multi-channel RF transmitter has the merits of high integration, small size, low cost and good universality, providing an efficient component for high field MRI systems.关键词
高场/磁共振成像(MRI)/多源射频发射机/软件无线电/现场可编程门阵列(FPGA)Key words
high-field/MRI/multi-channel radiofrequency transmitter/software defined radio/field programmable gate array (FPGA)分类
数理科学引用本文复制引用
何刚,王为民..一种用于高场MRI的多源射频发射机[J].波谱学杂志,2017,34(3):338-346,9.基金项目
国家重点基础研究发展计划("973"计划)资助项目(2015CB250902) （"973"计划）
国家高技术研究发展计划("863"计划)资助项目(2015AA020514) （"863"计划）
国家自然科学基金重点项目(61531002). （61531002）
