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Probing of susceptibility structures through the distant dipolar field effect.

Chung Ki Wong¹

¹ckwong@pas.rochester.edu

Magnetic Resonance Imaging

|May 7, 2013

Summary

The distant dipolar field (DDF) signal can reveal blood vessel properties like size and susceptibility. Varying the correlation gradient field allows extraction of these characteristics from the DDF signal

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Area of Science:

Biophysics
Medical Imaging
Physics

Background:

The distant dipolar field (DDF) signal is crucial for understanding magnetic susceptibility variations.
Subvoxel-scale analysis of susceptibility structures, such as blood vessels, remains a challenge.

Purpose of the Study:

To investigate the use of the DDF signal for extracting subvoxel-scale properties of susceptibility structures.
To analyze the influence of blood vessel characteristics on the DDF signal.

Main Methods:

Numerical simulations of randomly distributed blood vessels within a voxel.
Analysis of the DDF signal as a function of correlation gradient field strength.
Systematic variation of blood vessel parameters: volume ratio, size, and susceptibility offset.

Main Results:

The DDF signal exhibits a peak whose position depends on blood vessel volume ratio, size, and susceptibility offset.
The peak location varies as powers of these parameters, enabling property extraction.
Increased susceptibility offset allows probing smaller blood vessel sizes for a given volume ratio.

Conclusions:

The DDF signal's peak position provides a method to characterize blood vessels at subvoxel scales.
While DDF signal analysis is powerful, its broad peak width limits preferential signal selection at correlation length scales.