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Dosimetry in phototherapy cabinets.

D Fanselow, M Crone, M V Dahl

Journal of the American Academy of Dermatology

|July 1, 1987

Summary

Accurate phototherapy dosing requires careful measurement. A single electronic dosimeter reading in an empty cabinet does not reflect actual ultraviolet radiation dose received at diverse skin sites during treatment.

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Area of Science:

Dermatology
Photobiology
Medical Physics

Background:

Phototherapy is a common treatment for various skin conditions.
Accurate dosimetry is crucial for effective phototherapy and monitoring cumulative ultraviolet radiation (UVR) exposure.
Existing methods for measuring UVR dose may not accurately reflect patient exposure.

Purpose of the Study:

To evaluate the accuracy of a single electronic dosimeter reading in representing the UVR dose received at different skin sites during phototherapy.
To determine if dosimetry in an empty treatment cabinet correlates with actual patient skin dose.

Main Methods:

212 photoresponsive dosimeter badges were attached to a volunteer's skin.
The volunteer was exposed to ultraviolet A (UVA) radiation in a treatment cabinet.
Dose readings from badges at various skin sites were recorded and analyzed.

Main Results:

UVR dose varied significantly across different body areas.
Areas directly facing the lamps received the highest irradiation.
Inclined, shaded, and peripheral areas received less UVR; readings decreased when a subject was present.

Conclusions:

A single electronic dosimeter measurement in an empty phototherapy cabinet is insufficient to accurately represent the UVR dose received by a patient at all skin sites.
Patient positioning and body anatomy significantly influence UVR dosimetry.
Individualized dosimetry or improved measurement techniques are needed for precise phototherapy.

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