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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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The human nervous system handles vast amounts of information by translating sensory stimuli into neural impulses, which the brain processes, creating thoughts expressed through language or stored as memories. The brain also synthesizes information from emotions and memories, which significantly influence thoughts and behaviors. This intricate process creates a comprehensive mental picture.
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Pulseq-Graphical Programming Interface: Open source visual environment for prototyping pulse sequences and integrated

Keerthi Sravan Ravi1, Sneha Potdar1, Pavan Poojar2

  • 1Medical Imaging Research Center (MIRC), Dayananda Sagar Institutions, Bangalore, India.

Magnetic Resonance Imaging
|March 16, 2018
PubMed
Summary
This summary is machine-generated.

Pulseq-GPI offers an open-source platform for Magnetic Resonance (MR) algorithm development, integrating pulse sequence design with simulation and analysis tools. This unified approach streamlines MR research and development.

Keywords:
Graphical Programming InterfaceMR method development toolsOpen source pulse sequence design and rapid prototypingPulseqPython PulseqVendor neutral pulse sequence programming tools

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Area of Science:

  • Medical Imaging
  • Computational Science

Background:

  • Magnetic Resonance (MR) imaging requires sophisticated software for algorithm development, including pulse sequence design, simulation, and image reconstruction.
  • Current platforms often lack integration, necessitating separate tools for different stages of MR development.

Purpose of the Study:

  • To develop a single, open-source platform for comprehensive MR algorithm development.
  • To integrate pulse sequence design and deployment with simulation, reconstruction, and image analysis capabilities.

Main Methods:

  • Integrated the vendor-independent "Pulseq" platform with the Python-based Graphical Programming Interface (GPI) scientific development environment.
  • Created Pulseq-GPI, enabling visual sequence definition and export to the Pulseq file format.
  • Compared Pulseq-GPI with MATLAB-only and Python-only implementations using three fundamental MR sequences on a 1.5T scanner.

Main Results:

  • In vitro phantom images demonstrated equivalence between Pulseq-GPI, vendor implementations, and MATLAB-Pulseq.
  • Pulseq-GPI successfully integrated simulation, reconstruction, and analysis with pulse sequence design.
  • All implementations showed fast execution times (a few seconds), supporting both UI-based and command-line development.

Conclusions:

  • Pulseq-GPI provides a unified, open-source solution for MR algorithm development.
  • The platform facilitates visual and command-line programming for MR sequence design and analysis.
  • Future work includes ISMRMRD interface integration and Specific Absorption Ratio/Peripheral Nerve Stimulation computations.