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Magnetic Resonance Imaging

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 Imaging

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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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Updated: May 10, 2026

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Published on: February 19, 2021

Three-dimensional magnetization-prepared imaging using a concentric cylinders trajectory.

Kie Tae Kwon¹, Holden H Wu, Taehoon Shin

¹Department of Electrical Engineering, Magnetic Resonance Systems Research Laboratory, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine

|July 3, 2013

Summary

This summary is machine-generated.

New 3D concentric cylinders imaging schemes offer faster scan times for both brain imaging and non-contrast-enhanced angiography. This robust trajectory efficiently captures magnetization contrast, improving MRI performance.

Keywords:

3D concentric cylinders magnetization-prepared imaging non-Cartesian trajectories

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Published on: February 27, 2011

Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Imaging Technology
Radiology

Background:

Magnetization preparation is crucial for contrast in MRI.
Existing 3D Cartesian (3DFT) sequences can be limited by scan time and sensitivity to off-resonance effects.
Developing efficient and robust imaging trajectories is essential for advancing MRI applications.

Purpose of the Study:

To develop novel magnetization-prepared MRI sequences utilizing a 3D concentric cylinders trajectory.
To evaluate the effectiveness of this trajectory for T1-weighted brain imaging and non-contrast-enhanced peripheral angiography.

Main Methods:

Employed a 3D concentric cylinders trajectory as the readout, known for robustness to off-resonance effects and timing delays.
Developed T1-weighted brain imaging using an inversion-recovery-prepared radiofrequency-spoiled gradient-echo (IR-SPGR) sequence.
Developed non-contrast-enhanced (NCE) peripheral angiography using a magnetization-prepared balanced steady-state free precession (bSSFP) sequence, incorporating interleaving schemes and parallel imaging for efficiency.

Main Results:

Demonstrated successful in vivo brain imaging with IR-SPGR and NCE peripheral angiography with bSSFP using the concentric cylinders trajectory.
Achieved faster scan times compared to conventional 3DFT sequences while effectively capturing transient magnetization-prepared contrast.
Validated the feasibility of interleaving schemes and parallel imaging for enhanced scan efficiency in peripheral angiography.

Conclusions:

The 3D concentric cylinders trajectory serves as a robust and efficient readout for magnetization-prepared MRI.
This trajectory is well-suited for applications requiring rapid acquisition of contrast information, such as brain imaging and NCE angiography.