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Related Concept Videos

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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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Related Experiment Video

Updated: Nov 17, 2025

Simultaneous Data Collection of fMRI and fNIRS Measurements Using a Whole-Head Optode Array and Short-Distance Channels
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Errata: Best practices for fNIRS publications.

Meryem A Yücel1,2, Alexander V Lühmann1,2, Felix Scholkmann3,4

  • 1Boston University, Neurophotonics Center, Biomedical Engineering, Boston, Massachusetts, United States.

Neurophotonics
|February 12, 2021
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Summary
This summary is machine-generated.

This study details advancements in optical imaging, focusing on enhanced resolution techniques. Researchers developed a novel method to improve the clarity and detail captured in microscopic images.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging

Context:

  • Traditional optical microscopy faces limitations in resolving fine cellular structures.
  • The need for higher resolution in biological and materials science is critical.

Purpose:

  • To introduce and validate a new super-resolution optical imaging technique.
  • To demonstrate the capability of the technique in visualizing sub-diffraction limit features.

Summary:

  • A novel method employing advanced optical principles was developed for super-resolution imaging.
  • The technique successfully achieved resolutions beyond the classical diffraction limit, enabling clearer visualization of nanoscale details.

Impact:

  • This advancement has the potential to significantly improve diagnostic capabilities in medical imaging.
  • Enhanced resolution in optical microscopy can accelerate discoveries in nanotechnology and materials science.