Neonatal phototherapy radiometers: current performance characteristics and future requirements

Area of Science:

• Medical Physics
• Neonatal Care
• Optical Engineering

Background:

• Handheld radiometers are commonly used for monitoring neonatal phototherapy devices.
• Ensuring accurate light output is critical for effective jaundice treatment in newborns.
• Existing monitoring methods require validation against precise spectral analysis.

Purpose of the Study:

• To assess the wavelength and angular response of handheld radiometers used in neonatal phototherapy.
• To compare readings from selected radiometers with spectral analysis of phototherapy light sources.
• To propose a spectroradiometer-based system for accurate measurement.

Main Methods:

• Utilized a Bentham DMc150 double grating spectroradiometer for spectral analysis.
• Employed 10nm band pass optical filters (400-640 nm) with a fiber optic light source.
• Investigated specific radiometers: GE Biliblanket Light Meter II, NeoBLUE radiometer, and Bio-TEK radiometer 74345.
• Compared handheld meter readings with spectroradiometer data across various phototherapy devices.

Main Results:

• Variations in wavelength and angular response were observed among handheld radiometers.
• Indicated values from handheld meters showed discrepancies when compared to spectroradiometer-derived spectral analysis.
• The study identified the need for standardized, spectroradiometer-based measurement protocols.

Conclusions:

• Handheld radiometers offer convenience but require careful calibration and validation.
• Accurate spectral analysis is essential for reliable monitoring of neonatal phototherapy equipment.
• A proposed spectroradiometer-based system can enhance the precision and standardization of phototherapy device output measurements.