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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Flexible transceiver array for ultrahigh field human MR imaging.

Bing Wu1, Xiaoliang Zhang, Chunsheng Wang

  • 1Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California 94158, USA.

Magnetic Resonance in Medicine
|January 17, 2012
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Summary
This summary is machine-generated.

A novel flexible transceiver array for 7 Tesla (7T) MRI offers improved decoupling and scalability for diverse in vivo imaging applications. This design enhances image quality across various body parts without complex circuitry.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiofrequency (RF) Coil Design

Background:

  • High-frequency transceiver arrays in MRI often require complex decoupling circuitry for adequate element isolation.
  • Existing designs may lack flexibility and scalability for imaging diverse anatomical regions at ultrahigh magnetic fields.
  • Achieving sufficient decoupling is critical for minimizing signal interference and maximizing image quality in 7 Tesla (7T) MRI.

Purpose of the Study:

  • To design, implement, and test a flexible transceiver array for multi-purpose in vivo imaging at 7T.
  • To investigate an alternative coil element arrangement for improved decoupling without additional circuitry.
  • To assess the array's scalability and performance for imaging various human body parts.

Main Methods:

  • A 16-element flexible transceiver array was designed and constructed using alternate placement of coil elements with primary and secondary harmonics.
  • The array's decoupling capabilities were evaluated without dedicated decoupling circuits between resonant elements.
  • In vivo imaging of the human head, knee, and hand was performed on a 7T MRI scanner.
  • Parallel imaging techniques, specifically generalized autocalibrating partially parallel acquisitions (GRAPPA), were implemented and tested.

Main Results:

  • The flexible array demonstrated improved decoupling among coil elements, eliminating the need for conventional decoupling circuitry.
  • The design proved scalable in size and channel number, allowing for improved filling factors across different anatomies.
  • High-quality in vivo images of the head, knee, and hand were successfully acquired at 7T.
  • Effective 7T parallel imaging using GRAPPA was achieved with the developed transceiver array.

Conclusions:

  • The developed flexible transceiver array offers a versatile and scalable solution for multi-purpose in vivo imaging at 7T MRI.
  • The novel coil element arrangement effectively achieves decoupling, simplifying array construction and enhancing performance.
  • This design facilitates improved imaging of various body parts and supports advanced techniques like GRAPPA at ultrahigh fields.