A tissue's impedance is _______ not _______.

A tissue's impedance is _______ not _______.

• A. Estimated
• B. Measured
• C. Inferred
• D. Calculated

Answer: (D)

Impedance in tissue is a derived quantity, obtained by processing measurements rather than read directly as a single observed value. In practice, you apply a known current (or voltage) to the tissue and measure the resulting voltage (or current) across a range of frequencies. From those signals and the known geometry, you compute the impedance (often as a complex quantity with magnitude and phase) using the appropriate relationships. Because the value depends on the measurement data and the model of how the tissue conducts electricity, it is something you calculate rather than simply read off as directly measured. The other terms would imply you could obtain impedance without this calculation, which isn’t how it’s determined in typical tissue impedance analyses.

Impedance in tissue is a derived quantity, obtained by processing measurements rather than read directly as a single observed value. In practice, you apply a known current (or voltage) to the tissue and measure the resulting voltage (or current) across a range of frequencies. From those signals and the known geometry, you compute the impedance (often as a complex quantity with magnitude and phase) using the appropriate relationships. Because the value depends on the measurement data and the model of how the tissue conducts electricity, it is something you calculate rather than simply read off as directly measured. The other terms would imply you could obtain impedance without this calculation, which isn’t how it’s determined in typical tissue impedance analyses.