Is spatial pulse length adjustable?

Is spatial pulse length adjustable?

• A. Yes
• B. Sometimes
• C. No
• D. Only with specialized equipment

Answer: (C)

Spatial pulse length is the physical length of the transmitted ultrasound pulse in tissue, and it equals the number of cycles in the pulse times the wavelength. For a given transducer and operating frequency, the transmitter sends a fixed number of cycles, and the wavelength is set by the frequency in tissue. Because these factors are determined by the transducer design and its operation, you don’t have a direct control labeled as “adjust SPL” to tweak it during imaging. The only way SPL would change is by switching to a different transducer or a different operating frequency, which is not an on-the-fly adjustment. So, spatial pulse length is not adjustable in ordinary use.

Spatial pulse length is the physical length of the transmitted ultrasound pulse in tissue, and it equals the number of cycles in the pulse times the wavelength. For a given transducer and operating frequency, the transmitter sends a fixed number of cycles, and the wavelength is set by the frequency in tissue. Because these factors are determined by the transducer design and its operation, you don’t have a direct control labeled as “adjust SPL” to tweak it during imaging. The only way SPL would change is by switching to a different transducer or a different operating frequency, which is not an on-the-fly adjustment. So, spatial pulse length is not adjustable in ordinary use.