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Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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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Magnetic Resonance Imaging

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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Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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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...

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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In vivo GABA T2 determination with J-refocused echo time extension at 7 T.

A Andreychenko1, D W J Klomp, R A de Graaf

  • 1Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands; Department of Radiotherapy, University Medical Center Utrecht, Utrecht, The Netherlands.

NMR in Biomedicine
|July 30, 2013
PubMed
Summary

A new method accurately measures the T2 relaxation time of γ-aminobutyric acid (GABA) and creatine in vivo. This technique overcomes challenges posed by J-coupling, enabling precise quantification of these important brain metabolites.

Keywords:
7 TGABAMEGA-sLASERMRStransverse relaxation time

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroscience
  • Biophysics

Background:

  • Spectral editing techniques are crucial for detecting low-concentration metabolites like γ-aminobutyric acid (GABA) in vivo.
  • Existing spectral editing methods often use fixed, long echo times, necessitating T2 relaxation time measurements for accurate quantification.
  • J-coupling in spin systems like GABA complicates T2 measurements by modulating signal intensity and shape with echo time.

Purpose of the Study:

  • To develop a novel method for measuring T2 relaxation time in J-coupled spin systems, specifically for GABA.
  • To enable accurate in vivo quantification of metabolites by accounting for T2 relaxation effects.
  • To overcome the limitations of fixed echo times in spectral editing sequences.

Main Methods:

  • Proposed a method using chemical shift selective refocusing to refocus J-modulation at various echo times.
  • Integrated the refocusing technique with the MEGA-sLASER editing sequence for in vivo measurements at 7 Tesla.
  • Acquired signal intensities at multiple echo times to construct T2 decay curves.

Main Results:

  • Successfully measured the in vivo T2 relaxation time of GABA (87 ± 11 ms) and creatine (109 ± 8 ms) at 7 T.
  • Determined the T1 relaxation times for GABA (1334 ± 158 ms) and creatine (1753 ± 12 ms) in a single subject.
  • Demonstrated that the method allows arbitrary sampling of T2 decay curves without signal shape correction.

Conclusions:

  • The developed method effectively measures T2 relaxation times in coupled spin systems like GABA, independent of echo time limitations.
  • This technique enhances the accuracy of absolute metabolite quantification in spectral editing.
  • The method is versatile and can be applied to any spectral editing technique, with the shortest echo time limited by the editing sequence itself.