Which term does IRC stand for in ultrasound boundary theory?

Which term does IRC stand for in ultrasound boundary theory?

• A. Intensity Ratio Coefficient
• B. Intensity Reflection Coefficient
• C. Impedance Reflection Coefficient
• D. Impedance Transmission Coefficient

Answer: (B)

When ultrasound encounters a boundary between two media, part of the energy is reflected and part is transmitted. The quantity that describes how much energy is reflected, relative to the incident energy, is the intensity reflection coefficient. It is derived from the impedance mismatch Z1 and Z2 between the two media and is given by IRC = ((Z2 - Z1)/(Z2 + Z1))^2, which directly measures the fraction of incident intensity that is reflected. That naming—Intens ity Reflection Coefficient—fits because it specifically quantifies reflected energy, not just a ratio or a property of impedance itself. The other terms either imply a different quantity (a simple ratio without tying it to energy reflection) or refer to impedance-related measures rather than the energy reflected.

When ultrasound encounters a boundary between two media, part of the energy is reflected and part is transmitted. The quantity that describes how much energy is reflected, relative to the incident energy, is the intensity reflection coefficient. It is derived from the impedance mismatch Z1 and Z2 between the two media and is given by IRC = ((Z2 - Z1)/(Z2 + Z1))^2, which directly measures the fraction of incident intensity that is reflected. That naming—Intens ity Reflection Coefficient—fits because it specifically quantifies reflected energy, not just a ratio or a property of impedance itself. The other terms either imply a different quantity (a simple ratio without tying it to energy reflection) or refer to impedance-related measures rather than the energy reflected.