ARDMS SPI Study Tools
Use these free interactive calculators to practice two important ultrasound physics formulas: axial resolution and the Nyquist limit.
Axial resolution is calculated by dividing the spatial pulse length by two.
Axial Resolution = SPL ÷ 2
Axial Resolution
0.770 mm
The Nyquist limit is the maximum Doppler frequency shift that can be measured without aliasing.
Nyquist Limit = PRF ÷ 2
Nyquist Limit
4000 Hz