OCT Axial Resolution
Estimate Gaussian-spectrum OCT axial resolution in air and sample.
Description
Gaussian-spectrum OCT axial resolution scales center wavelength squared by inverse spectral FWHM.
Gaussian-spectrum OCT axial resolution scales center wavelength squared by inverse spectral FWHM. Division by sample index gives the sample-space length.1
Estimate Gaussian-spectrum OCT axial resolution in air and sample.
When to use OCT Axial Resolution
Use this tool to estimate Gaussian-spectrum OCT axial resolution in air and sample.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use OCT Axial Resolution and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter centerWavelengthNanometers, spectralFwhmNanometers, sampleRefractiveIndex using the field table and calculation rules, then run the tool.
- Read airAxialResolutionMicrometers, sampleAxialResolutionMicrometers. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| centerWavelengthNanometers | Center wavelength (nm) | number; minimum: 0 | Required |
| spectralFwhmNanometers | Spectral FWHM (nm) | number; minimum: 0 | Required |
| sampleRefractiveIndex | Sample refractive index | number; minimum: 0 | Required |
Enter nonnegative center and positive bandwidth and sample index. Return air and sample resolution in µm.
air_µm=(2ln2/π)λ_nm²/FWHM_nm/1000; sample=air/index Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| airAxialResolutionMicrometers | Air axial resolution (µm) | number; minimum: 0 |
| sampleAxialResolutionMicrometers | Sample axial resolution (µm) | number; minimum: 0 |
{
"input": {
"centerWavelengthNanometers": 800,
"spectralFwhmNanometers": 100,
"sampleRefractiveIndex": 1.4
},
"output": {
"airAxialResolutionMicrometers": 2.8241356819539405,
"sampleAxialResolutionMicrometers": 2.0172397728242433
}
}Limitations and assumptions
No measured point-spread function, dispersion, spectral-shape fit or clinical image quality is evaluated.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use SLD Coherence Length: Estimate Gaussian SLD coherence length from center wavelength and spectral FWHM. For a complementary task, use OCTA Avascular Area: Measure zero-flow area and fraction from a binary OCTA flow mask.
References
-
OCT Axial Resolution — tool.io
Similar or alternative tools
- SLD Coherence Length
Estimate Gaussian SLD coherence length from center wavelength and spectral FWHM.
- OCTA Avascular Area
Measure zero-flow area and fraction from a binary OCTA flow mask.