The magnetic resonance imaging (MRI) technique is often used
in the clinical practice for non-invasive MR scanning and testing of
biomedical samples [1,2], as well as different parts of a human
body [3,4]. The purpose of MRI scanning of the human vocal tract
is to develop 3D models [5] showing propagation of the sound
wave in the vocal tract during phonation in real clinical situations,
e.g. in observing the influence of various inborn defects in human
supraglottal spaces on speech and voice, or simulation of various
post-surgical states in patients after oral or throat surgery. The
3D finite element modeling enables also to simulate the influence
of the acoustic impedance changes of the vocal tract by phonating
into glass tubes or straws used in voice training and therapy [6]. In
this case, the MR scan of the human vocal tract structure is carried
out simultaneously with recording of a speech signal [7]. On the
other hand, this type of MRI devices can also be applied for testing
and analyzing of the diamagnetic and paramagnetic materials
widely used for body implants or dental casting alloys [8], the soft
magnetic materials [9], or the thin layer magnetic materials