What is the 13 microsecond rule?

The 13-Microsecond Rule. When sound travels through soft tissue: For every 13 us of go-return time, the object creating the reflection is 1 centimeter deeper in the body.

What is the 13 microsecond rule in ultrasound?

The 13 (us) Microsecond Rule – in soft tissue, every 13us of go-return time means the reflector is 1 cm deeper in the body.

What is the range equation in ultrasound?

Range equation- the relationship between round-trip pulse travel time, propagation speed, and distance to a reflector. -Total distance the pulse travels is twice the reflector depth.

What is Nyquist limit in ultrasound?

The Nyquist limit represents the maximum Doppler shift frequency that can be correctly measured without resulting in aliasing in color or pulsed wave ultrasound.

What is the range of an equation?

The range of a function is the complete set of all possible resulting values of the dependent variable (y, usually), after we have substituted the domain. In plain English, the definition means: The range is the resulting y-values we get after substituting all the possible x-values.

What limitation is present when you use a high PRF Doppler?

When the PRF is increased, so is the Nyquist limit. The disadvantage of this method is that higher pulse repetition frequency reduces sensitivity to low velocities. It also does not work with very high frequency velocities as the aliasing artifact will persist.

What is the Nyquist rule?

The Nyquist theorem specifies that a sinuisoidal function in time or distance can be regenerated with no loss of information as long as it is sampled at a frequency greater than or equal to twice per cycle.

What is an advantage of using high PRF Doppler?

An advantage of a high-prf pulse doppler radar is that it can readily detect targets with a high relative-velocity since such echoes do not compete with the echoes from clutter that are at lower doppler frequencies.

What happens if you increase the Doppler transmit frequency?

If you increase the Doppler transmit frequency, which of the following will result? You have increased the packet size while using color doppler to evaluate flow.