Semmelweis Scanner – User Guide v22.03
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Normal light
UV light
Software evalutaion
(Semmelweis
Scanner)
S. epidermidis
colonies
Fig. 4. Microbiological validation of the Semmelweis Scanner
During our limited scale study, we were able to prove that regions on the hand treated
sufficiently with the trainingrub containing fluorescent dye and subsequently recorded by the
Semmelweis Scanner are in fact disinfected; not developing colonies after a regular blood agar
infusion and a standard 24 hour incubation time.
7.2. Limitations of the software evaluation
7.2.1. Nails
Artificial nails and nail polishes can cause false readings. In accordance with WHO hand
hygiene practice, their use should be avoided.
7.2.2. Skin type
Skin tone and pores can have an effect on UV dye intensity after applied on the hands.
7.2.3. Moving hands
Hands must be held steady during the scan. Accidental movements can result in image
distortion or blurred images that we cannot process effectively.
7.2.4. Closed fingers
Fingers must be spread during the scan to have a proper reading of the areas in between.
7.2.5. Irregularities
The algorithm used for evaluation calculates with certain anatomical features of a regular hand.
As a result, some types of irregularities (e.g., a missing or extra finger, skin abnormalities) can
