科研之友
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摘要
This study extends our recent works on object-oriented Finite-Difference Time-Domain (FDTD) simulations into a parallel-computing framework, producing substantially improved performance with respect to computing time efficiency. The simulator is intended to be a complete, high-performance FDTD model of an MRI system including all temporal radio frequency (RF) and low-frequency field generating units and electrical models of the patient. The parallel computational structure has been designed using a Message-Passing Interface (MPI) Library. The implementation of the MRI-dedicated FDTD algorithms within the parallel computing framework is detailed. To improve the simulator performance in a realistic network-computing environment, several software design aspects have been investigated. These include: data transmission with consideration of buffered and synchronous communication, load balancing on the computing network using a weighting mechanism. The power of the optimized FDTD parallel architecture is illustrated by two distinct, large-scale field calculation problems involving the study of the interaction of RF-fields with human tissue (whole-body, male and female) in high held MRI and characterization of the temporal eddy currents induced on the cryostat vessel during gradient switching. The examples demonstrate the improved capabilities of the simulator. in addition, through the parallelization of the FDTD algorithm we are in a position to study various MRI phenomena at much higher spatial resolutions than was previously feasible.
- 出版日期2007-8
- 单位浙江大学
