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Related Concept Videos

Gradient Vectors and Their Applications01:19

Gradient Vectors and Their Applications

Every point on a topographical map corresponds to a particular elevation, so the landscape can be modeled as a surface whose height depends on horizontal position. From any given location, a hiker may face infinitely many directions, but only one direction produces the fastest possible increase in elevation. This unique route is called the direction of steepest ascent, and in multivariable calculus, it is represented by the gradient vector of the elevation function.The gradient vector points...
Significance of the Gradient Vector01:27

Significance of the Gradient Vector

A surface defined by a function of two variables can be understood by examining how it changes along specific directions. When one variable is held constant, the surface reduces to a curve that reflects variation in the other variable. For example, fixing one variable and moving parallel to a coordinate axis produces a cross-sectional curve. The slope of this curve at a given point represents how the function changes in that particular direction, providing a measure of local steepness.By...

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Related Experiment Video

Updated: Jun 8, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Efficient implementation of hardware-optimized gradient sequences for real-time imaging.

J Andrew Derbyshire1, Daniel A Herzka, Elliot R McVeigh

  • 1Translational Medicine Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, DHHS, Bethesda, Maryland 20892-1061, USA. jad11@nih.gov

Magnetic Resonance in Medicine
|September 30, 2010
PubMed
Summary
This summary is machine-generated.

This study enhances real-time MRI imaging by optimizing gradient pulses and phase-encoding. The new method significantly improves imaging speed for interactive, real-time applications.

Related Experiment Videos

Last Updated: Jun 8, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology

Background:

  • Interactive real-time imaging is crucial for dynamic medical procedures.
  • Balanced steady-state free precession (bSSFP) is a widely used MRI sequence.
  • Current methods face limitations in speed and adaptability during real-time adjustments.

Purpose of the Study:

  • To improve the performance of interactive real-time imaging using bSSFP.
  • To develop a novel phase-encoding strategy for optimized gradient waveforms.
  • To enable real-time adaptation of imaging parameters for varying scan planes.

Main Methods:

  • Employed hardware-optimized gradient pulses tailored for MRI gradient subsystems.
  • Introduced a novel phase-encoding strategy simplifying gradient waveform design.
  • Implemented real-time redesign of gradient waveforms based on scan plane manipulation.
  • Utilized linear combinations for intermediate phase-encode steps.

Main Results:

  • Achieved a 14-25% improvement in sequence pulse repetition time.
  • Demonstrated faster imaging compared to vendor-supplied real-time imaging sequences.
  • Ensured operation within specified gradient subsystem limits for all scan-plane orientations.

Conclusions:

  • The novel approach significantly enhances the speed of interactive real-time MRI.
  • The simplified waveform design facilitates easier implementation and adaptation.
  • This method offers a practical improvement for dynamic imaging applications.