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

Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

659
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
659
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.6K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.6K
Errors in Taping01:18

Errors in Taping

282
Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
282
Aliasing01:18

Aliasing

519
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.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
519

You might also read

Related Articles

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

Sort by
Same author

Patterns of Muscle Health in Single- and Multi-Site Chronic Pain: A UK Biobank Normative Modeling Study.

medRxiv : the preprint server for health sciences·2026
Same authorSame journal

An evaluation of brain volume and cortical thickness measurement at 0.55 T.

Magma (New York, N.Y.)·2026
Same author

Imaging Near Spinal Fixation Hardware at 0.55 T Compared With 3 T.

Journal of magnetic resonance imaging : JMRI·2026
Same author

Neural Shape Modeling Reveals Early and Progressive Femoral Bone Shape and Cartilage Thickness Changes After Anterior Cruciate Ligament Reconstruction.

medRxiv : the preprint server for health sciences·2026
Same author

Optimization of fetal brain MRI at 0.55 T with slice-to-volume reconstruction.

Magma (New York, N.Y.)·2026
Same author

Clinical quality of breath-held T1-weighted breast MRI in the supine position.

European journal of radiology·2026

Related Experiment Video

Updated: Jan 7, 2026

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
07:03

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration

Published on: February 23, 2017

8.0K

Distortion correction in TSE near titanium implants at 0.55 T using reversed frequency-encoding and model-based

Bochao Li1, Nam G Lee2, Daehyun Yoon3

  • 1Alfred E. Mann Department of Biomedical Engineering, University of Southern California, 3740 McClintock Ave, EEB 416, Los Angeles, CA, 90089-2564, USA. bochaoli@usc.edu.

Magma (New York, N.Y.)
|December 22, 2025
PubMed
Summary
This summary is machine-generated.

A new imaging method for titanium implants at 0.55T improves signal-to-noise ratio (SNR) by using low readout bandwidth. This technique reduces geometric distortions and blurring, offering clearer images near metallic hardware.

Keywords:
0.55 Tesla MRIGradient nonlinearityMetallic implantMid-field MRIOff-resonance

More Related Videos

Measuring the Complete-arch Distortion of an Optical Dental Impression
06:51

Measuring the Complete-arch Distortion of an Optical Dental Impression

Published on: May 30, 2019

7.9K
Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
03:58

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

768

Related Experiment Videos

Last Updated: Jan 7, 2026

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
07:03

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration

Published on: February 23, 2017

8.0K
Measuring the Complete-arch Distortion of an Optical Dental Impression
06:51

Measuring the Complete-arch Distortion of an Optical Dental Impression

Published on: May 30, 2019

7.9K
Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
03:58

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

768

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Materials Science

Background:

  • Imaging metallic implants, such as titanium, presents challenges due to artifacts.
  • Existing methods like View Angle Tilting (VAT) and Slice Encoding for Metal Artifact Correction (SEMAC) can introduce blurring.
  • Optimizing signal-to-noise ratio (SNR) while minimizing geometric distortion is crucial for diagnostic accuracy.

Purpose of the Study:

  • To develop and evaluate a novel imaging method for visualizing tissues near titanium implants at 0.55 Tesla (T).
  • The method aims to enhance SNR by utilizing a low readout bandwidth.
  • Key objectives include reducing in-plane geometric distortions and artifacts caused by susceptibility effects.

Main Methods:

  • Acquisition of Turbo Spin Echo (TSE) data in opposite frequency-encoding directions.
  • Model-based iterative reconstruction incorporating Gradient Nonlinearity (GNL) correction for each acquisition.
  • Estimation of susceptibility-induced displacement maps and reconstruction of a final image correcting for both GNL and metal-induced distortions.

Main Results:

  • The proposed method preserves spatial resolution without the blurring observed in VAT and SEMAC at equivalent bandwidths.
  • Reduced off-resonance distortion at low readout bandwidths led to a 1.4-1.6 fold increase in apparent SNR.
  • Demonstrated clearer tissue delineation in phantoms and patients with orthopedic implants compared to conventional techniques.

Conclusions:

  • The developed GNL and off-resonance distortion correction method effectively images near metal at 0.55T.
  • It enables the use of low readout bandwidth for improved SNR without introducing blurring.
  • This technique offers a significant advancement for MRI near metallic implants.