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Composition of MRI phantom equivalent to human tissues
Hirokazu Kato1, Masahiro Kuroda, Koichi Yoshimura
1Department of Radiological Sciences and Technology, Faculty of Health Sciences, Okayama University Medical School, 2-5-1, Shikata-cho, Okayama 700-8558, Japan. hkato@md.okayama-u.ac.jp
Medical Physics
|November 11, 2005
Summary
Researchers developed new MRI phantoms (CAG and CAGN) mimicking human tissue properties for T1/T2 relaxation and conductivity. These versatile phantoms are practical for magnetic resonance imaging and hyperthermia research.
Area of Science:
- Biomedical Engineering
- Medical Imaging Physics
Background:
- Magnetic Resonance Imaging (MRI) requires accurate phantoms for calibration and research.
- Existing phantoms may not fully replicate the diverse relaxation and conductivity properties of human tissues across relevant frequencies.
Purpose of the Study:
- To introduce and characterize two novel MRI phantoms (CAG and CAGN) with tunable T1 and T2 relaxation times and electrical conductivity.
- To provide detailed composition and property ranges for these phantoms.
Main Methods:
- Development of phantoms using carrageenan, GdCl3 (T1 modifier), agarose (T2 modifier), NaCl (conductivity modifier), and NaN3.
- Characterization of T1 and T2 relaxation times and electrical conductivity by varying ingredient concentrations.
- Assessment of phantom mechanical properties for anatomical replication.
Main Results:
- Phantoms exhibit T1 values from 202-1904 ms and T2 values from 38-423 ms.
- The CAGN phantom demonstrates conductivity of 0.27-1.26 S/m, relevant for 1-130 MHz frequencies.
- Phantoms possess sufficient mechanical integrity to model human torso without reinforcement and are shapeable.
Conclusions:
- The developed CAG and CAGN phantoms accurately simulate human tissue MRI properties at 1.5 T.
- These phantoms offer a practical and versatile tool for MRI and hyperthermia research applications.