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RO It measures what is there; it does not decide what to do. Software reads scalp photographs and returns counts — hairs per square centimetre, follicular units per square centimetre, and the proportion of thin miniaturised hairs among thick terminal ones. Those numbers are inputs to a plan. They are not the plan.
It is automated trichoscopy, not a new modality. Counting hairs under magnification and tracking miniaturisation is long-established clinical practice. What automation changes is speed and repeatability, so the same scalp measured twice is measured the same way twice.
| Reads reliably from an image | Cannot be read from an image |
|---|---|
| Hair and follicular unit density | Family history and the pattern still to come |
| Terminal to miniaturised ratio | Scalp laxity and tissue quality |
| Approximate area of loss | Medical history, medication, candidacy |
Its numbers move with the photograph. Lighting, hair length, whether the scalp is wet, and camera distance all shift the count. This is why a single reading means less than a series taken the same way, and why a density figure quoted without its conditions is not comparable between clinics.
Its real value is longitudinal. One measurement is a snapshot; the same measurement repeated over a year shows whether loss is progressing or a treatment is holding — the question a photograph alone cannot answer.
Related terms
- 3D hairline simulation
- Density planning
- Safe donor area
- Graft vs hair count
- Trichoscopy
- Hair miniaturization
For an estimate of the grafts a pattern needs, see the graft calculator. For how patterns are classified, see the Norwood scale.
