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Related Concept Videos

Magnetic Susceptibility and Permeability01:31

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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A variable, usually notated by capital letters such as X and Y, is a characteristic or measurement that can be determined for each member of a population. Data are the actual values of variables. They may be numbers, or they may be words. Datum is a single value.
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Color in Coordination Complexes
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Data that are countable or measurable in specific units are called numerical or quantitative data. Quantitative data are always numbers. Quantitative data are the result of counting or measuring the attributes of a population. Amount of money, pulse rate, weight, number of people living in a town, and number of students who opt for statistics are examples of quantitative data.
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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Updated: Feb 14, 2026

Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent
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Quantitative susceptibility mapping (QSM): Decoding MRI data for a tissue magnetic biomarker.

Yi Wang1,2,3, Tian Liu4

  • 1Radiology, Weill Medical College of Cornell University, New York, New York, USA.

Magnetic Resonance in Medicine
|July 22, 2014
PubMed
Summary

Quantitative susceptibility mapping (QSM) in MRI overcomes limitations of previous methods. This technique enables accurate measurement of magnetic susceptibility for diverse biomedical applications.

Keywords:
BayesianQSMcalcificationcontrast agentdipole fielddipole kernelferritingradient echohemoglobinhemorrhageironmetabolismmorphology enabled dipole inversionmyelinoxygen consumptionquantificationquantitative susceptibility mapping

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Area of Science:

  • Biophysics
  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • MRI signal phase and T2* contrast are limited in specificity for studying tissue magnetic susceptibility.
  • Existing methods struggle with background signal and dipole kernel zeroes, hindering accurate susceptibility measurements.
  • Understanding magnetic susceptibility is crucial for diagnosing various pathophysiological changes.

Purpose of the Study:

  • To summarize the fundamental physical principles and algorithmic steps of Quantitative Susceptibility Mapping (QSM).
  • To discuss current clinical and technical challenges and ongoing developments in QSM.
  • To provide resources including references, code, and data for QSM research.

Main Methods:

  • Utilizes MRI signal deconvolution to determine tissue susceptibility.
  • Employs physically meaningful regularizations, such as Bayesian approaches, to improve accuracy.
  • Addresses challenges like background signal absence and dipole kernel zeroes.

Main Results:

  • Accurate Quantitative Susceptibility Mapping (QSM) is achievable with advanced regularization techniques.
  • QSM enables the study of various biomedical applications, including iron distribution and metabolic oxygen consumption.
  • The method offers improved molecular specificity compared to traditional MRI-based susceptibility measurements.

Conclusions:

  • QSM represents a significant advancement in MRI for quantitative susceptibility analysis.
  • The technique has broad potential for diagnosing and monitoring a range of diseases and conditions.
  • Further development is ongoing to address clinical and technical issues, enhancing its utility.