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An MRI tissue equivalent lesion phantom using a novel polysaccharide material.

M W Groch¹, J A Urbon, W D Erwin

¹Department of Medical Physics, Rush Graduate College, Rush Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612.

Magnetic Resonance Imaging

|January 1, 1991

Summary

A novel polysaccharide, TX-150, enables creation of stable, multi-compartment MRI phantoms without septa. This material allows independent adjustment of T1 and T2 relaxation times for advanced phantom design.

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Area of Science:

Biomaterials Science
Magnetic Resonance Imaging (MRI) Physics

Background:

Developing stable, multi-compartment MRI phantoms is crucial for accurate imaging.
Existing methods often require septa, limiting phantom design and stability.

Purpose of the Study:

To introduce a new polysaccharide material, TX-150, for constructing septumless multi-compartment MRI phantoms.
To demonstrate the ability to independently control T1 and T2 relaxation times within these phantoms.

Main Methods:

TX-150 was formulated into water-based gels with tissue-equivalent properties.
Metal phthalocyanines were used to create stable regions with differing T1 relaxation times.
2-2-diphenyl-1 picrylhydrazyl was employed to modify T2 relaxation times independently.

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Main Results:

TX-150 gels allowed for the formation of contiguous regions with distinct T1 properties due to tight binding of metal phthalocyanines.
T2 relaxation times were effectively modulated using 2-2-diphenyl-1 picrylhydrazyl without significantly affecting T1 values.
Septumless lesion phantoms with variable T1 and T2 properties were successfully created.

Conclusions:

TX-150 is a promising material for developing advanced MRI phantoms.
The independent control of T1 and T2 relaxation times facilitates the creation of more realistic and versatile phantom designs.