Ultrasound Physics Calculator
Calculate ultrasound wavelength, resolution and penetration depth by frequency.
About Ultrasound Physics Calculator
Higher frequency shortens the wavelength and improves resolution, but attenuation rises in proportion to frequency, so penetration falls. That inverse relationship is why deep abdominal imaging uses low frequencies and superficial structures use high ones. Transducer selection is entirely governed by this trade-off, and no amount of gain recovers signal that has been attenuated below the noise floor.
Formula
Ultrasound Physics
λ = c ÷ f; axial resolution = spatial pulse length ÷ 2; attenuation ≈ 0.5 dB/cm/MHz
- axial resolution
- Half the spatial pulse length, so shorter pulses resolve better
- attenuation
- About 0.5 dB per centimetre per megahertz in soft tissue
Worked example
With the default values below, Ultrasound Physics Calculator returns Wavelength of 0.3080. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Transducer frequencyminimum 0.1 MHz
- 5 MHz
- Propagation speed in tissueminimum 100 m/s
- 1,540 m/s
- Cycles per pulseminimum 0.5
- 2
- Imaging depthminimum 0.1 cm
- 10 cm
Results
- Wavelength
- 0.3080 mm
- Axial Resolution
- 0.3080 mm
- Practical Penetration Depth
- 12.00 cm
- Maximum Pulse Repetition Frequency
- 7,700.0 Hz
- Round Trip Attenuation
- 50.00 dB
Step by step
- 1Values used
- 2Ultrasound Physics
- 3Wavelength= 0.3080 mm
- 4Axial Resolution= 0.3080 mm
- 5Practical Penetration Depth= 12.00 cm
- 6Maximum Pulse Repetition Frequency= 7,700.0 Hz
- 7Round Trip Attenuation= 50.00 dB
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or fees or charges into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- This is an educational physics tool. It is not intended for clinical diagnostic decisions or equipment configuration, which must be handled by qualified sonographers and medical physicists.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
This is an educational physics tool. It is not intended for clinical diagnostic decisions or equipment configuration, which must be handled by qualified sonographers and medical physicists.
Frequently Asked Questions
How is Ultrasound Physics calculated?
λ = c ÷ f; axial resolution = spatial pulse length ÷ 2; attenuation ≈ 0.5 dB/cm/MHz Higher frequency shortens the wavelength and improves resolution, but attenuation rises in proportion to frequency, so penetration falls. That inverse relationship is why deep abdominal imaging uses low frequencies and superficial structures use high ones.
Why does Ultrasound Physics matter?
Transducer selection is entirely governed by this trade-off, and no amount of gain recovers signal that has been attenuated below the noise floor.
What values do I need to enter?
This calculator takes 4 inputs: Transducer frequency, Propagation speed in tissue, Cycles per pulse, Imaging depth. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.