Concept explainers
BIO Magnetic induction tomography (MIT) Magnetic induction tomography is an imaging method used in mineral, natural gas, oil, and groundwater exploration, as an archaeological tool; and for medical imaging MIT has also been used to measure topsoil depth in agricultural soils. Topsoil depth is information that many farmers need for instance, corn yield is much higher in soil that has a deep topsoil layer above the underlying, impermeable claypan. Using a trailer attached to a tractor, a farmer can map an
(about 20-acre) field for topsoil depth in about 1 hour.
Figure 21.28 shows how MIT works A time-varying
Which of the statements below about magnetic induction tomography (MIT) and transcranial magnetic stimulation (TMS), studied in Section 21.5 are true?
a. Both MIT and TMS have source currents in coils, source magnetic fields, and induced currents.
b. MIT detects the induced magnetic field produced by the induced current, and TMS does not.
c. MIT provides information directly about the imaged area, whereas TMS disrupts some brain activity, and the disruption is measured in some other way.
d. a and c only
e. a, b, and c
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