Integrating Dosimetry and its Importance

Almost all modern phototherapy cabinets in dermatologists’ offices are equipped with a technology called integrating dosimetry. This same technology is now an option on Daavlin home phototherapy units. So what is it, how does it work and how does it benefit you?

Basically, it is a built-in meter that constantly measures the UV output of the lamps in your device. This information is then forwarded to your control system where it is then “integrated” or added to the dose that has cumulated so far. It will continue this process until the delivered dose equals the desired dose at which time the device will shut off. For formula geeks, the equation is Time = Joules/cm2*16.67/milliwatts/cm2.

Integrating dosimetry is a benefit to you because the output of your unit naturally varies for all kinds of reasons. Lamps have an optimum operating temperature and as they warm-up their output increases. If they get too warm, it decreases. As lamps age, their output decreases. Even voltage variations can have an effect. On a hot afternoon when air conditioners are widely used, voltage to your home may drop causing a change. So, your output might be different from morning to afternoon. But with integrating dosimetry, these variations are detected and factored or “integrated” into the dose you receive. The power output of your phototherapy device affects the amount of time it will take you to get your treatment.

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