Spatial pulse length is directly proportional to which quantity?

Spatial pulse length is directly proportional to which quantity?

• A. Amplitude
• B. Wavelength
• C. Time between pulses
• D. Number of cycles in the pulse

Answer: (D)

Spatial pulse length is the physical length of a single ultrasound pulse in space. It is determined by how many cycles are contained in the pulse and how long each cycle is in space. The key relationship is SPL = (number of cycles in the pulse) × (wavelength). This means SPL grows directly as you add more cycles to the pulse, provided the wavelength stays the same. So, the more cycles in the pulse, the longer the pulse appears in space. Amplitude affects intensity, not length; time between pulses relates to repetition rate; and while wavelength influences SPL, the direct, controllable factor described here is the number of cycles in the pulse.

Spatial pulse length is the physical length of a single ultrasound pulse in space. It is determined by how many cycles are contained in the pulse and how long each cycle is in space. The key relationship is SPL = (number of cycles in the pulse) × (wavelength). This means SPL grows directly as you add more cycles to the pulse, provided the wavelength stays the same. So, the more cycles in the pulse, the longer the pulse appears in space. Amplitude affects intensity, not length; time between pulses relates to repetition rate; and while wavelength influences SPL, the direct, controllable factor described here is the number of cycles in the pulse.