Integrated parallel reception, excitation, and shimming (iPRES)
Hui Han1, Allen W Song, Trong-Kha Truong
1Brain Imaging and Analysis Center, Duke University, Durham, North Carolina 27705, USA.
Magnetic Resonance in Medicine
|May 1, 2013
Summary
A novel hardware platform integrates parallel imaging (PI) and B0 shimming using a single coil array. This unified system significantly reduces B0 errors and image distortions, showing promise for in vivo MRI applications.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Hardware Engineering
- Biomedical Engineering
Background:
- Conventional MRI systems use separate coil arrays for parallel excitation/reception and B0 shimming.
- A novel hardware concept enables integrated parallel reception, excitation, and B0 shimming using a single coil array.
- This design allows independent coexistence of radiofrequency and direct currents within the same coil for distinct functions.
Purpose of the Study:
- To develop a novel hardware platform concept for integrated parallel reception, excitation, and B0 shimming.
- To demonstrate the feasibility of a unified coil system for simultaneous MRI functions.
- To explore the potential of this integrated system for advanced in vivo imaging.
Main Methods:
- Proof-of-concept B0 shimming experiments were conducted using a two-coil array in a phantom.
- B0 shimming simulations were performed on a 48-coil array model of the human brain.
- Individually optimized direct currents were applied for B0 shimming in experimental and simulated setups.
Main Results:
- Experimental results showed B0 root-mean-square error reduction of 62-81% and minimized echo-planar image distortions.
- Simulations demonstrated that dynamic shimming with the integrated 48-coil array reduced prefrontal and temporal B0 errors by 66-79% compared to static shimming.
- The integrated system outperformed conventional shim arrays, showing 12-23% greater B0 error reduction in dynamic shimming simulations.
Conclusions:
- The integrated parallel reception, excitation, and shimming concept is feasible.
- A unified coil system can effectively perform parallel excitation/reception and B0 shimming.
- This technology holds significant promise for improving in vivo MRI applications.
Related Concept Videos
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
01:12Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
01:10Reconstruction of Signal using Interpolation
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 sampling...
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
01:20Immunoprecipitation
Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
01:23Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by: