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Related Experiment Videos

In vivo method for correcting transmit/receive nonuniformities with phased array coils.

Jinghua Wang1, Maolin Qiu, R Todd Constable

  • 1Department of Diagnostic Radiology, Yale University School Medical Center, The Anlyan Center, 300 Cedar Street, New Haven, CT 06510, USA. Jinghua.wang@yale.edu

Magnetic Resonance in Medicine
|February 22, 2005
PubMed
Summary

This study introduces a new method to correct intensity nonuniformities in MRI scans from phased array coils. The transmit field/receiver sensitivity (TFRS) approach significantly improves image uniformity, enhancing applications like tissue segmentation.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Phased array coils are essential in MRI research and clinical practice.
  • Intensity nonuniformities in MRI images can hinder accurate applications like tissue segmentation.

Purpose of the Study:

  • To develop and evaluate a novel method for correcting intensity nonuniformities caused by phased array coils in MRI.
  • To compare the proposed method against conventional techniques for improved image quality.

Main Methods:

  • A transmit field/receiver sensitivity (TFRS) approach was developed, utilizing in vivo measures of body coil transmission fields and phased array coil reception sensitivity.
  • The TFRS method was validated using both uniform phantoms and heterogeneous objects like the human brain.
  • Quantitative comparisons were made with standard methods, including reference scans using the body coil and low-pass filtering.

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Main Results:

  • The TFRS approach demonstrated superior performance in correcting intensity nonuniformities compared to standard methods.
  • For uniform phantoms, the TFRS method reduced the signal intensity standard deviation to mean ratio from approximately 21% to 13%.
  • Successful in vivo application of the TFRS method was shown in human brain images.

Conclusions:

  • The TFRS method offers a robust solution for correcting intensity nonuniformities in MRI, improving image quality and reliability.
  • This technique is versatile, applicable to various pulse sequences, coil configurations, and anatomical regions.
  • The TFRS approach enhances the utility of phased array coils for critical applications such as precise tissue segmentation.