Spatial Resolution Calculator - FWHM and FWTM
Calculate Full Width at Half Maximum (FWHM) and Full Width at Tenth Maximum (FWTM) from line profile data for nuclear medicine image quality analysis.
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Peak Value
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Half Maximum
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Tenth Maximum
FWHM — Full Width at Half Maximum
Width (pixels)
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Width (mm)
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FWTM — Full Width at Tenth Maximum
Width (pixels)
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Width (mm)
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Line Profile Visualization
How It Works
This calculator determines FWHM and FWTM from a line profile — commonly used to assess spatial resolution in nuclear medicine imaging systems (gamma cameras, PET scanners).
- Enter Line Profile Data: Paste intensity values separated by spaces, commas, or new lines.
- Pixel Size: Enter the physical size of one pixel in mm (check your scanner/system specifications).
- Calculation: The tool:
- Finds the peak intensity and its position.
- Calculates the Half Maximum (peak / 2) and Tenth Maximum (peak / 10).
- Uses linear interpolation to find the exact crossing points on both sides.
- Multiplies the pixel width by the pixel size to give a physical measurement in mm.
- Results: FWHM and FWTM are displayed in both pixels and millimeters, with a visual chart showing the profile and reference lines.
This tool is for educational purposes only.