**Wavelength equation**

## λ = **c** / **f **

**Wavelength **(mm) = **Propagation Speed** / **Frequency** (MHz)

The wavelength is basically just the distance that it takes for a single cycle to occur. Because it is a distance our units will be those of distance, i.e. mm, cm, um.

As we see in the formula the wavelength is dependent on the frequency of the beam as well as the propagation speed of the medium. Generally these are not things we can change as the user unless we use a different transducer or image through structures with a different propagation speed.

**High frequency : short wavelength****Low frequency : long wavelength**

An easy way to calculate the wavelength in soft tissue is to just divide 1.54mm (the propagation speed of soft tissue) by the frequency in MHz.

*Example. **In soft tissue, a pulse with a frequency of 2.5MHz has a wavelength of 0.61mm.*

## λ = **c** / **f **

1.54 mm/us / 2.5MHz = 0.61 mm

## Ultrasound Wavelength

*Ultrasound Wavelength*.You scored %%SCORE%% out of %%TOTAL%%.Your performance has been rated as %%RATING%%

Question 1 |

they both lie within the same wave. | |

the Doppler effect is accounted for. | |

they are in 2 different wavelengths. | |

the frequency is too high. |

Question 2 |

adjusting the transducer settings | |

the density of the medium | |

both the medium and the source. | |

the ultrasound technician |

Question 3 |

0.51 MHz | |

6.16 mm | |

0.385 mm | |

0.385 MHz |

Question 4 |

propagation speed multiplied by frequency, | |

the distance over which a single cycle occurs. | |

the distance between the bottom and peak of a wave cycle. | |

the measurement of a wave in millimeters. |

Question 5 |

Propagation speed times wavelength equals frequency. | |

Propagation speed divided by wavelength equals frequency. | |

Propagation speed divided by frequency equals wavelength. | |

Wavelength times frequency equals propagation speed |

Question 6 |

It remains constant. | |

It decreases. | |

It increases. | |

The two measurements are unrelated. |

Question 7 |

the crest | |

beam frequency | |

element | |

amplitude |

Question 8 |

propagation speed times frequency (in MHz). | |

frequency minus wavelength times propagation speed. | |

propagation speed divided by frequency. | |

frequency divided by propagation speed. |

Question 9 |

when frequency increases or decreases wavelength does the opposite. | |

that wavelength and frequency are an unrelated ratio. | |

when frequency goes up so does wavelength. | |

there are limitless options once frequency drops below 1.0. |

Question 10 |

the number of cycles per second. | |

the number of cycles on the screen at a given time. | |

the settings which produce the best image resolution. | |

usually determined by the on-duty physician. |

List |

#### Franco

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