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Related Concept Videos

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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Related Experiment Video

Updated: May 13, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Flip angle mapping with the accelerated 3D look-locker sequence.

Trevor Wade1, Charles A McKenzie, Brian K Rutt

  • 1Department of Medical Biophysics, The University of Western Ontario, London, Canada.

Magnetic Resonance in Medicine
|March 7, 2013
PubMed
Summary
This summary is machine-generated.

A new non-inverted Double Angle Look-Locker technique rapidly maps flip angles in 3D MRI scans. This efficient method provides accurate flip angle measurements in about one minute, improving imaging quality.

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Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data
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Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data

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Related Experiment Videos

Last Updated: May 13, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data
06:36

Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data

Published on: October 18, 2024

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Quantitative MRI

Background:

  • Accurate flip angle determination is crucial for quantitative MRI.
  • Existing methods for flip angle mapping can be time-consuming and complex.
  • The Look-Locker technique is a common method for T1 measurement.

Purpose of the Study:

  • To present a novel, rapid, and efficient 3D flip angle mapping technique.
  • To validate the accuracy and speed of the proposed method.
  • To demonstrate its application in correcting in vivo quantitative MRI data.

Main Methods:

  • Modification of the accelerated 3D Look-Locker T1 measurement technique.
  • Removal of inversion pulses and interleaving of two radiofrequency pulses with different amplitudes.
  • Direct fitting for the true flip angle using a reduced parameter set, termed non-inverted Double Angle Look-Locker.

Main Results:

  • In vitro validation against actual flip angle imaging (AFI) shows high accuracy (within 10%).
  • Flip angle maps are acquired rapidly, in approximately 1 minute.
  • The technique accurately measures excited slab profiles and is applied to correct in vivo DESPOT T1 data.

Conclusions:

  • The non-inverted Double Angle Look-Locker technique offers a rapid and efficient solution for 3D flip angle mapping.
  • This method significantly reduces acquisition time while maintaining accuracy.
  • It holds potential for improving the reliability of quantitative MRI techniques.