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Development of a human‐tissue‐like phantom for 3.0‐T MRI
Author(s) -
Ikemoto Yusuke,
Takao Wataru,
Yoshitomi Keisuke,
Ohno Seiichiro,
Harimoto Takashi,
Kanazawa Susumu,
Shibuya Koichi,
Kuroda Masahiro,
Kato Hirokazu
Publication year - 2011
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3656077
Subject(s) - imaging phantom , agarose , relaxation (psychology) , biomedical engineering , materials science , t2 relaxation , torso , nuclear magnetic resonance , nuclear medicine , magnetic resonance imaging , chemistry , medicine , physics , anatomy , radiology , chromatography
Purpose: A 3.0‐T MRI phantom having human‐tissue‐equivalent relaxation times was developed.Methods: The ingredients of the phantom are carrageenan (for gelatinization), GdCl 3 (as a T 1 ‐relaxation modifier), agarose (as a T 2 ‐relaxation modifier), and NaN 3 (as an antiseptic agent). Numerous samples with varying concentrations of GdCl 3 and agarose were prepared, and T 1 and T 2 were measured using 3.0‐T MRI.Results: Relaxation times of the phantom samples ranged from 395 to 2601 ms for T 1 values and 29 to 334 ms for T 2 values. Based on the measured results, empirical formulae were devised to express the relationships between the concentrations of relaxation modifiers and relaxation times.Conclusions: Adjustment of GdCl 3 and agarose concentrations allows arbitrary setting of relaxation times, and the creation of a phantom that can mimic relaxation times of human‐tissue. Carrageenan is considered the most suitable as a gelling agent for an MRI phantom, as it permits the relatively easy and inexpensive production of a large phantom such as for the human torso, and which can be easily shaped with a knife.