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Related Experiment Video

Updated: Mar 14, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

Published on: February 8, 2014

A rapid and robust gradient measurement technique using dynamic single-point imaging.

Hyungseok Jang^1,2, Alan B McMillan¹

¹Department of Radiology, Wisconsin Institute for Medical Research, University of Wisconsin, Madison, Wisconsin, USA.

Magnetic Resonance in Medicine

|October 5, 2016

Summary

This summary is machine-generated.

A new dynamic single-point imaging (SPI) method rapidly measures k-space trajectories. This technique enhances image reconstruction quality and acquisition speed in various MRI applications.

Keywords:

GIRF calibration eddy current gradient k-space trajectory single-point imaging

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Last Updated: Mar 14, 2026

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Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Physics
Image Reconstruction

Background:

Accurate k-space trajectory measurement is crucial for high-quality MRI reconstruction.
Existing methods for gradient measurement can be complex or require specialized hardware.

Purpose of the Study:

To introduce a novel, simple, and rapid gradient measurement technique using dynamic single-point imaging (SPI).
To enable robust measurement of k-space trajectories for improved MRI.

Main Methods:

Utilized the variable field-of-view (FOV) property of dynamic SPI, which is gradient shape-dependent.
Acquired 1D dynamic SPI data to determine relative FOV scaling factors, representing k-space positions.
Applied the technique for gradient impulse response function estimation.

Main Results:

Improved reconstructed image quality in 3D ultrashort echo, 2D spiral, and multi-echo bipolar gradient-echo imaging.
Achieved approximately 30% improved acquisition speed and more accurate fat/water separation in phantoms using ramp-sampled trajectories.

Conclusions:

The proposed dynamic SPI-based method offers fast k-space trajectory measurement.
The technique requires simple implementation, no additional hardware, and enhances MRI image quality.