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

Equation of Motion for a Rigid Body01:12

Equation of Motion for a Rigid Body

623
The movement of a rigid object can be understood through the equations that explain both translational and rotational motion about the center of mass of the object, point G. This center of mass is the point where the equation of motion for translational motion comes into play, as per Newton's Second Law.
The combined moments generated about the center of mass of the object are equal to the rate of change of the angular momentum of the body. An external force, when applied at a different...
623
Planar Rigid-Body Motion01:22

Planar Rigid-Body Motion

1.0K
Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
Planar motion is typically divided into three distinct categories. The first is rectilinear translation, demonstrated by a subway train that moves along...
1.0K
Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

5.5K
A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
5.5K
Gravity between Spherical Bodies01:27

Gravity between Spherical Bodies

9.4K
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
9.4K
Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

8.0K
A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
8.0K
Kinetic Energy for a Rigid Body01:13

Kinetic Energy for a Rigid Body

539
Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
539

You might also read

Related Articles

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

Sort by
Same author

Cognitive decline in thrombotic thrombocytopenic purpura survivors: The role of white matter health as assessed by MRI.

British journal of haematology·2023
Same author

Abstracts of presentations to the Annual Meetings of the Canadian Society of Colon and Rectal Surgeons Canadian Association of General Surgeons Canadian Association of Thoracic Surgeons: Canadian Surgery Forum, Toronto, Ont., September 6-9, 2007.

Canadian journal of surgery. Journal canadien de chirurgie·2023
Same author

Canadian Surgery Forum.

Canadian journal of surgery. Journal canadien de chirurgie·2022
Same author

Abstracts of presentations to the Annual Meetings of the Canadian Association of General Surgeons Canadian Association of Thoracic Surgeons Canadian Hepato-Pancreato-Biliary Society Canadian Society of Surgical Oncology Canadian Society of Colon and Rectal Surgeons: Victoria, BC Sept. 10-13, 2009.

Canadian journal of surgery. Journal canadien de chirurgie·2022
Same author

Simultaneous measurements of myocardial glucose metabolism and extracellular volumes with hybrid PET/MRI using concurrent injections of Gd-DTPA and [<sup>18</sup>F]FDG.

Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology·2021
Same author

Tracking the progress of inflammation with PET/MRI in a canine model of myocardial infarction.

Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology·2021
Same journal

Deep learning-based dose prediction to enhance planning efficiency in cervical brachytherapy with hybrid applicators.

Physics in medicine and biology·2026
Same journal

Corrigendum: Referenceless MR thermometry-a comparison of five methods (2017<i>Phys. Med. Biol</i>.<b>62</b>1-16).

Physics in medicine and biology·2026
Same journal

Corrigendum: Measured and Monte Carlo simulated electron backscatter to the monitor chamber for the varian TrueBeam linac (2016<i>Phys. Med. Biol</i>.<b>61</b>8779).

Physics in medicine and biology·2026
Same journal

Corrigendum: 3D range-modulator for scanned particle therapy: development, Monte Carlo simulations and experimental evaluation (2017<i>Phys. Med. Biol</i>.<b>62</b>7075).

Physics in medicine and biology·2026
Same journal

Recent progress in applications of computing to radiotherapy (ICCR 2016).

Physics in medicine and biology·2026
Same journal

Novel TMS coils designed using an inverse boundary element method.

Physics in medicine and biology·2026
See all related articles

Related Experiment Video

Updated: Jan 27, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
10:02

Whole-body PET/MRI of Pediatric Patients: The Details That Matter

Published on: December 19, 2017

15.3K

Rigid-body motion correction in hybrid PET/MRI using spherical navigator echoes.

P M Johnson1,2, R Taylor3,4,5, T Whelan1

  • 1Robarts Research Institute, Western University, London, ON, Canada.

Physics in Medicine and Biology
|March 19, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces spherical navigator echoes (SNAVs) for motion correction in positron emission tomography and magnetic resonance imaging (PET/MRI). SNAVs effectively reduce motion artifacts in PET/MRI scans, improving image quality and quantitative accuracy.

More Related Videos

Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
05:17

Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451

Published on: April 18, 2025

846
MRI and PET in Mouse Models of Myocardial Infarction
10:46

MRI and PET in Mouse Models of Myocardial Infarction

Published on: December 19, 2013

12.4K

Related Experiment Videos

Last Updated: Jan 27, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
10:02

Whole-body PET/MRI of Pediatric Patients: The Details That Matter

Published on: December 19, 2017

15.3K
Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
05:17

Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451

Published on: April 18, 2025

846
MRI and PET in Mouse Models of Myocardial Infarction
10:46

MRI and PET in Mouse Models of Myocardial Infarction

Published on: December 19, 2013

12.4K

Area of Science:

  • Medical Imaging
  • Biophysics

Background:

  • Integrated PET/MRI offers complementary diagnostic information.
  • Motion artifacts significantly degrade PET and MRI data quality due to long acquisition times.
  • Simultaneous PET/MRI acquisition necessitates robust motion correction techniques.

Purpose of the Study:

  • To develop and evaluate a novel MRI navigator technique for motion correction in simultaneous PET/MRI.
  • To assess the impact of incorporating spherical navigator echoes (SNAVs) into a fast imaging sequence on image quality.
  • To demonstrate the efficacy of SNAV-based motion correction in reducing artifacts in both PET and MRI data.

Main Methods:

  • Development of spherical navigator echoes (SNAVs) for 6-DOF rigid body motion measurement.
  • Integration of SNAVs into a turbo FLASH (tfl) sequence to create the tfl-SNAV pulse sequence.
  • In vivo brain imaging in a healthy volunteer and phantom studies with simulated motion under simultaneous PET/MRI acquisition.

Main Results:

  • The tfl-SNAV sequence showed no detrimental impact on image quality compared to the standard tfl sequence.
  • SNAV motion correction successfully reduced motion artifacts in both PET and MR images acquired with an anthropomorphic brain phantom.
  • Corrected PET/MRI images exhibited improved image quality and quantitative similarity to reference scans after motion correction.

Conclusions:

  • Spherical navigator echoes (SNAVs) provide accurate and rapid measurement of rigid body motion for PET/MRI.
  • SNAV-based motion correction is effective in mitigating motion artifacts in simultaneous PET/MRI.
  • This technique enhances the diagnostic utility of PET/MRI by improving image quality and quantitative accuracy.