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Related Concept Videos

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.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...

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Related Experiment Video

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Construction and Application of Cerebral Functional Region-Based Cerebral Blood Flow Atlas Using Magnetic Resonance Imaging-Arterial Spin Labeling
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Accelerated territorial arterial spin labeling based on shared rotating control acquisition: an observer study for

Hironori Kamano1, Takashi Yoshiura, Akio Hiwatashi

  • 1Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.

Neuroradiology
|July 27, 2011
PubMed
Summary

Shared rotating control acquisition in territorial arterial spin labeling (tASL) significantly reduces imaging time. This method accurately evaluates brain vascular territories, comparable to conventional techniques, ensuring reliable diagnostic information.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Vascular Imaging

Background:

  • Territorial arterial spin labeling (tASL) imaging time can be reduced by 33% using shared rotating control acquisition.
  • However, this method may compromise vascular territory estimation accuracy due to magnetization transfer compensation issues.

Purpose of the Study:

  • To validate the accuracy of shared rotating control acquisition for evaluating vascular territories in tASL.
  • To compare the diagnostic performance of shared rotating control acquisition against conventional methods.

Main Methods:

  • Twenty-four patients underwent 3.0-T MRI tASL using both normal and simulated shared rotating control acquisition methods.
  • Composite vascular territory maps were generated, encoding blood flow from major arteries.
  • Two independent observers assessed territorial flow in 26 brain regions at three time points, with agreement analyzed using kappa statistics.

Main Results:

  • Excellent inter-reader agreement was observed for both acquisition methods (κ=0.98).
  • Excellent inter-method agreement (κ=0.98) was found, with slightly lower agreement in posterior cerebral artery territories (κ=0.79–0.93).

Conclusions:

  • Shared rotating control acquisition in tASL provides comparable vascular territory information to the normal control method.
  • This optimized acquisition substantially shortens imaging time without compromising diagnostic accuracy.