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Related Concept Videos

Magnetic Resonance Imaging01:24

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...
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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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Prostate T(1) quantification using a magnetization-prepared spiral technique.

Warren D Foltz1, Masoom A Haider, Peter Chung

  • 1Radiation Medicine Program, Princess Margaret Hospital, University of Toronto, Toronto, Ontario, Canada. warren.foltz@rmp.uhn.on.ca

Journal of Magnetic Resonance Imaging : JMRI
|January 29, 2011
PubMed
Summary
This summary is machine-generated.

This study adapted T1prep for fast, radiofrequency-insensitive prostate T1 quantification. Results show T1prep accurately measures T1 values, supporting its use for monitoring treatment response.

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Area of Science:

  • Magnetic Resonance Imaging
  • Prostate Cancer Imaging
  • Quantitative Biomarkers

Background:

  • Accurate T1 quantification is crucial for prostate cancer assessment.
  • Existing methods may be limited by scan time and radiofrequency (RF) sensitivity.
  • Novel techniques are needed for efficient and robust prostate T1 mapping.

Purpose of the Study:

  • To adapt the T1prep technique for time-efficient, RF-insensitive prostate T1 quantification at 1.5 Tesla.
  • To evaluate the signal-to-noise ratio (SNR) limits for voxel-based versus subregion analysis.
  • To assess the feasibility of T1prep in patients with localized prostate cancer.

Main Methods:

  • Adapted a magnetization-prepared spiral imaging technique (T1prep) for robust T1 contrast.
  • Implemented multislice imaging for acquisition within 5 minutes.
  • Performed in vitro testing for RF insensitivity and accuracy, followed by a pilot study in 15 prostate cancer patients.

Main Results:

  • The multislice T1prep design demonstrated excellent RF insensitivity (<1% error) and accuracy (within 3%).
  • Significantly reduced T1 values were observed from peripheral zone (PZ) to central gland (CG) to tumor subregions.
  • SNR measurements indicated voxel-based analysis was inappropriate due to limitations.

Conclusions:

  • T1prep effectively quantifies prostate T1, serving as an adjunct for quantitative perfusion and treatment response monitoring.
  • Intrapatient T1 heterogeneities support individualized patient assessment.
  • Future trials will leverage SNR calculations to enable voxel-based analysis.