StarShot Analyzer

Star shot QA: detection of the radiation lines, minimum circle diameter and wobble centre, with a PDF report.

Star shot image

TIFF (recommended), PNG or JPEG.

Analysis parameters

Circular profile radius

Distance from the centre, as a fraction of the image (0.20 – 0.95).

Minimum peak height

Minimum relative height of a valid peak (0.05 – 0.50).

Tolerance (mm)

Maximum diameter of the minimum circle (0.05 – 1.00 mm).

Precise FWHM detection of the star lines

Invert the image

Use it if pylinac's automatic inversion is wrong.

Centring point X (px)

Centring point Y (px)

Engine: pylinac Starshot (dpi 105, SID 1000 mm). Your file is deleted within one hour.

Analysing…

No analysis yet.

Upload a star shot image, or run the demo image, to see the results here.

How it works

Upload a star shot image (an EPID TIFF export or a scanned film).
pylinac samples a circular profile, finds the radiation lines (FWHM by default) and fits the smallest circle touching all of them.
The test passes if the circle diameter is within the tolerance. Adjust the parameters to re-run the analysis on the same file.