A versatile pulse programmer for magnetic resonance imaging.

Area of Science:

• Medical Imaging
• Electrical Engineering
• Computer Science

Background:

• Magnetic Resonance Imaging (MRI) systems require precise timing control for RF and gradient channels.
• Existing pulse programmers may lack the flexibility to independently correct channel delays, impacting image quality.
• Field-programmable gate arrays (FPGAs) offer a flexible platform for developing advanced hardware control systems.

Purpose of the Study:

• To present hardware and software solutions for a versatile pulse programmer.
• To demonstrate the capability of independent delay control for multiple outputs.
• To validate the performance of the pulse programmer in correcting gradient system delays within an MRI scanner.

Main Methods:

• Designed a pulse programmer centered around a Field-Programmable Gate Array (FPGA).
• Implemented a 16-bit event structure for the pulse programmer.
• Developed independent delay control for each of the 16 outputs.
• Integrated the pulse programmer into an MRI scanner for experimental validation.

Main Results:

• The FPGA-based pulse programmer provides design flexibility and reduces electronic component count.
• Achieved independent delay adjustment for all 16 outputs.
• Successfully demonstrated the correction of gradient system delay in an MRI scanner.
• The proposed system effectively addresses timing inaccuracies in MRI channels.

Conclusions:

• The developed FPGA pulse programmer offers a versatile and flexible solution for precise timing control in MRI.
• Independent output delay control is a key feature for correcting channel-specific delays.
• The experimental results confirm the system's effectiveness in improving MRI performance through delay correction.