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Digital Camera
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Panasonic LUMIX DMC-TZ8 14.5 megapixel digital camera (figure 1) |
Macro to 3 cm from a 12X zoom lens equivalent to a 25–300 mm lens on an SLR |
Inexpensive |
Digital single lens reflex (SLR) camera [32]
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Built in flash |
Readily available |
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Rugged metal casing |
Automatic |
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Lithium ion rechargeable battery |
Pre-specified settings to achieve uniform, reproducible images whilst using amateur photographers |
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4GB memory card |
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Background
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Grey background (figure 4) |
A small grey board positioned behind the body part being assessed |
Transportable and light weight |
Green or grey surgical drapes [33]
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Manoeuvrable |
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Non-reflective |
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Neutral |
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Scale
[34]–[36]
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5cm, non-reflective grey scale (figure 2) |
Vertical scale |
Defined the upper and lower boundaries of the photograph (figure 2) |
Paper or commercially available scale e.g. the ABFO scale [34]
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Single use sticker |
Easily removed and discarded |
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Good infection control |
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Identification Card
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Cardboard handwritten card (figure 3) |
Pre-formatted to add individual randomisation number, study visit day, sore number, date and time of image capture |
Maintained study blinding |
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Photographed prior to impetigo image capture to avoid inclusion of any identifying details in the image for scoring by blinded reviewers[37]
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When forgotten, identification card was photographed upside down immediately after the series of sores was captured [37]
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