The range of frequencies contained in a pulse is termed the:

The term that describes the range of frequencies contained in a pulse is referred to as bandwidth. Bandwidth is a crucial concept in sonography because it affects the resolution and quality of the ultrasound images produced. When an ultrasound pulse is emitted, it consists of a range of frequencies rather than a single frequency. This range is the bandwidth; a wider bandwidth generally allows for improved axial resolution in imaging.

In addition, higher bandwidths mean that the ultrasound system can better differentiate between closely spaced structures due to the ability to utilize different frequency components. Practically, this is why transducers with higher bandwidth are often preferred for their enhanced imaging capabilities.

Though other terms like spectrum and harmonics are related to frequency analysis and wave phenomena, they do not specifically define the range of frequencies within a pulse, making bandwidth the most accurate choice. Resonate frequency pertains to specific frequencies at which a system naturally oscillates and is not directly relevant to the definition of pulse frequency range.