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Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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The effects of coupled B1 fields in B1 encoded TRASE MRI - A simulation study.

Pallavi Bohidar1, Hongwei Sun2, Jonathan C Sharp2

  • 1Space MRI Lab, Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada.

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Summary
This summary is machine-generated.

Transmit Array Spatial Encoding (TRASE) MRI requires isolated RF coils. This study found that minimal B1 field coupling (below k=0.01) is ideal for TRASE, with acceptable performance up to k=0.1.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Engineering

Background:

  • Transmit Array Spatial Encoding (TRASE) is a novel MRI technique.
  • TRASE utilizes phase gradients in transmit RF (B1) fields for spatial encoding.
  • RF coil interactions can generate unwanted B1 fields, disrupting TRASE's spatial encoding.

Purpose of the Study:

  • Investigate the impact of B1 field coupling on TRASE imaging.
  • Determine acceptable levels of B1 field interactions for 2D TRASE.
  • Provide crucial data for designing TRASE transmit array systems.

Main Methods:

  • Bloch equation-based simulations were employed.
  • The study focused on a 3-coil setup for 2D TRASE.
  • Analysis involved assessing performance based on coupling constants (k) and S12 measurements.

Main Results:

  • Ideal 2D TRASE performance was observed for coupling constants below k=0.01.
  • Acceptable performance was maintained up to k=0.1.
  • This corresponds to required S12 measurements between -50 dB and -30 dB.

Conclusions:

  • B1 field isolation is critical for effective TRASE MRI.
  • The study quantifies acceptable B1 field coupling levels for practical TRASE systems.
  • Findings guide the development of robust TRASE transmit arrays.