Seedless: on-the-fly pulse calculation for NMR experiments.

Area of Science:

• Nuclear Magnetic Resonance (NMR) spectroscopy
• Pulse sequence optimization
• Magnetic Resonance Imaging (MRI)

Background:

• NMR signal loss occurs due to non-uniform excitation across chemical shifts and radio frequency (RF) inhomogeneity.
• Existing methods struggle to compensate for these effects, limiting sensitivity and control.

Purpose of the Study:

• To introduce Seedless, a computational tool for calculating RF pulses that counteract signal loss.
• To enhance magnetisation control and boost signal-to-noise ratio in NMR experiments.
• To enable on-the-fly optimization of NMR pulses tailored to specific samples and hardware.

Main Methods:

• Utilizes an optimized GRadient Ascent Pulse Engineering (GRAPE) implementation for rapid pulse calculation.
• Applies one of four selected transforms to identified chemical shift bands.
• Demonstrates effectiveness using imaging experiments across 1D, 2D, and 3D applications.

Main Results:

• Seedless calculates compensating pulses in seconds, enabling on-the-fly optimization.
• Demonstrated increases in coil volume and signal-to-noise ratio in imaging experiments.
• Achieved significant sensitivity gains in diverse chemical and biological NMR applications.

Conclusions:

• Seedless offers a versatile method to improve NMR sensitivity across all pulse sequences.
• The tool's ability to tailor pulses to specific samples and hardware enhances experimental outcomes.
• On-the-fly pulse optimization via Seedless advances NMR capabilities for research and diagnostics.