Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Center of Mass00:59

Center of Mass

The center of mass is the point at which the total mass of an object can be said to be concentrated. It is a fundamental principle in mechanics and physics that applies to all objects regardless of their shape or size. The center of gravity is the point at which an object’s weight appears to be concentrated and can be used to balance the object perfectly.
The knowledge of the center of mass can also help us to describe and predict the motion of objects. For example, when a ball is thrown into...
Center of Gravity00:58

Center of Gravity

The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but its center...
Center of Gravity01:15

Center of Gravity

The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
To determine its location, the principle of moments can be utilized by dividing the object into...
Finding the Center of Gravity01:03

Finding the Center of Gravity

The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate is...
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Orders of Magnitude01:15

Orders of Magnitude

The order of magnitude of a number is the power of 10 that most closely approximates it. Thus, the order of magnitude estimates the scale (or size) of its value. To find the order of magnitude of a number, take the base-10 logarithm of the number and round it to the nearest integer. Then the order of magnitude of the number is simply the resulting power of 10.
The order of magnitude is simply a way of rounding numbers consistently to the nearest power of 10. This makes doing rough mental math...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

An Exploration of Motion-Sampling Interactions in 3D MRI for Neuroimaging.

Magnetic resonance in medicine·2025
Same author

Awake pediatric brain-MRI: a fast multi-sequence scan augmented with motion compensated single-shot 2D acquisitions.

Radiology advances·2025
Same author

Rapid Diagnosis of Cauda Equina Syndrome: A Prospective Study Comparing Photon-counting CT With MRI.

Journal of computer assisted tomography·2025
Same author

Deep learning initialized compressed sensing (Deli-CS) in volumetric spatio-temporal subspace reconstruction.

Magma (New York, N.Y.)·2025
Same author

Code review facility in Magnetic Resonance in Medicine.

Magnetic resonance in medicine·2024
Same author

Boosting reproducible research practices with the repeat it with me: Reproducibility team challenge.

Magnetic resonance in medicine·2024
Same journal

Dependence of the Extra-Cellular Diffusion Coefficient on the Fractions of Neurites and Cell Bodies in Gray Matter.

Magnetic resonance in medicine·2026
Same journal

Triple-Pulse <sup>23</sup>Na MRI Sequence (TriNa) for Simultaneous Acquisition of Spin-Density-Weighted and Fluid-Attenuated Images.

Magnetic resonance in medicine·2026
Same journal

Evaluation of Phantom Doping Materials in Quantitative Susceptibility Mapping.

Magnetic resonance in medicine·2026
Same journal

Design of an 8-Channel Transmit 32-Channel Receive 11.7T Head Coil and Evaluation of SNR Gains.

Magnetic resonance in medicine·2026
Same journal

The Potential for Absolute Temperature Imaging Based on Brain Metabolites Using an FID-Shifting Approach in Gradient Echo Planar Spectroscopic Imaging (GREPSI).

Magnetic resonance in medicine·2026
Same journal

Prospective Head Motion Correction in T1- and T2-Weighted Long Echo Train Sequences Using Servo Navigation.

Magnetic resonance in medicine·2026
See all related articles

Related Experiment Video

Updated: Jun 20, 2026

Echo Particle Image Velocimetry
16:31

Echo Particle Image Velocimetry

Published on: December 27, 2012

View Order With Arbitrary Center Echoes.

Henric Rydén1,2, Ola Norbeck1,2, Sophie Schauman2

  • 1Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden.

Magnetic Resonance in Medicine
|June 19, 2026
PubMed
Summary
This summary is machine-generated.

New view-order methods allow precise control over echo selection in multi-shot MRI scans like RARE and MPRAGE. This enhances image contrast and offers greater flexibility in sequence design for improved MRI.

Keywords:
FSEMPRAGEMRIRAREview order

Related Experiment Videos

Last Updated: Jun 20, 2026

Echo Particle Image Velocimetry
16:31

Echo Particle Image Velocimetry

Published on: December 27, 2012

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Reconstruction

Background:

  • Multi-shot MRI sequences like RARE and MPRAGE are crucial for high-resolution imaging.
  • Selecting the center echo in k-space is vital for image quality and contrast.
  • Current methods can limit flexibility and introduce artifacts.

Purpose of the Study:

  • To develop vendor-independent view-order constructions for arbitrary center echo selection in multi-shot MRI.
  • To enable explicit control over echo and shot indices, focusing on RARE and MPRAGE sequences.
  • To avoid discontinuities near the k-space center.

Main Methods:

  • Developed vendor-independent view-order methods to assign echo and shot indices.
  • Implemented and evaluated methods in 2D RARE, 3D RARE, and MPRAGE sequences.
  • Utilized phantom and in vivo experiments, supported by an interactive dashboard.

Main Results:

  • Achieved explicit selection of the center echo/shot without altering scan parameters.
  • Demonstrated controllable T2 weighting in RARE and T1 weighting in MPRAGE by varying the center echo.
  • Observed artifact patterns consistent with echo-index distribution properties.

Conclusions:

  • Arbitrary-center view orders decouple scan parameters from center-echo selection.
  • These constructions are compatible with various sampling strategies (partial Fourier, parallel imaging) and sequences.
  • Arbitrary center echoes provide enhanced control over image contrast and sequence design flexibility.