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True phase quantitative susceptibility mapping using continuous single-point imaging: a feasibility study.

Hyungseok Jang1, Xing Lu1,2, Michael Carl3

  • 1Department of Radiology, University of California San Diego, San Diego, California.

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|October 17, 2018
PubMed
Summary
This summary is machine-generated.

Continuous single-point imaging (CSPI) enables true phase imaging for more accurate quantitative susceptibility mapping (QSM). This novel method reduces artifacts and provides reliable susceptibility measurements in phantoms and human tibia samples.

Keywords:
QSMSPIboneironsusceptibility

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Biophysics

Background:

  • Quantitative susceptibility mapping (QSM) is crucial for detecting and characterizing tissue magnetic properties.
  • Conventional QSM methods can be limited by artifacts and accuracy issues.
  • Developing advanced imaging techniques is essential for improving QSM performance.

Purpose of the Study:

  • To investigate the feasibility of continuous single-point imaging (CSPI) for quantitative susceptibility mapping (QSM).
  • To evaluate the accuracy and artifact reduction capabilities of CSPI in QSM.
  • To demonstrate the utility of CSPI for obtaining true phase images.

Main Methods:

  • CSPI was developed as a modification of single-point imaging (SPI) to acquire multiple echoes in a single scan.
  • High temporal resolution sampling of free induction decay was used to obtain k-space data.
  • Parallel imaging with autocalibration and optional temporal averaging were employed to optimize acquisition.
  • Reconstructed CSPI images were processed using a morphology-enabled dipole inversion QSM framework.

Main Results:

  • CSPI demonstrated high linearity (R² = 0.9948) between estimated susceptibility and iron concentration in phantoms.
  • Reconstructed CSPI phase images exhibited significantly reduced ringing artifacts compared to frequency-encoded images.
  • Ex vivo experiments on human tibia samples yielded susceptibility values consistent with literature ( -1.6 to -2.1 ppm).

Conclusions:

  • The feasibility of using CSPI for quantitative susceptibility mapping has been successfully demonstrated.
  • CSPI provides a viable method for acquiring true phase images, enhancing QSM accuracy.
  • This technique shows promise for improved artifact reduction and reliable susceptibility quantification.