General Concepts 2 min read
Static Field Magnets
The main field magnet [Thomas, 1993] is required to produce an intense and highly uniform, static magnetic field over the…
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General Concepts 2 min read
Fundamentals of MRI Instrumentation
Three types of magnetic fields — main fields or static fields (B2), gradient fields, an radiofrequency (RF) fields (B1) —…
General Concepts 2 min read
Defining Terms
Gyromagnetic ratio γ : An intrinsic property of a nucleus. It determines the Larmor frequency through the relation ω0 = −γ B0 .…
General Concepts 4 min read
Contrast Mechanisms
The tremendous clinical utility of MRI is due to the great variety of mechanisms that can be exploited to create…
General Concepts 2 min read
Fast Imaging
The 2D FT scan of k-space has the disadvantage that the scan time is proportional to the number of phase…
General Concepts 2 min read
SNR Considerations
The signal strength is determined by the EMF induced from each voxel due to the processing moments. The magnetic moment…
General Concepts 1 min read
Perspective
For most imaging systems, diffraction limits the resolution. That is, the resolution is limited to the wavelength divided by the…
General Concepts 2 min read
Resolution and Field of View
The fundamental image characteristics of resolution and field of view (FOV) are completely determined by the characteristics of the k-space…
General Concepts 2 min read
2D Imaging
Many different gradient waveforms can be used to scan k-space and to obtain a desired image. The most common approach,…
General Concepts 2 min read
Space Analysis of Data Acquisition
In MRI, we receive a volume integral from an array of oscillators. By ensuring that the phase,“signature” of each oscillator…
General Concepts 4 min read
Fundamentals of MRI
Magnetic resonance imaging exploits the existence of induced nuclear magnetism in the patient. Materials with an odd number of protons…
Advanced Concepts 15 min read
Bearing Capacity Analyses
A bearing capacity failure is defined as a foundation failure that occurs when the shear stresses in the soil exceed…
