Radiation dose reduction in a neonatal intensive care unit in computed radiography

Area of Science:

• Medical Physics
• Pediatric Radiology
• Neonatal Care

Background:

• Neonates, particularly premature infants, are highly sensitive to ionizing radiation due to rapidly proliferating cells.
• Pediatric radiology necessitates careful radiation dose management to minimize long-term risks.

Purpose of the Study:

• To evaluate radiation doses from neonatal chest x-rays using thermoluminescent dosimetry.
• To determine the threshold of radiation exposure where quantum noise does not compromise diagnostic image quality in neonates.
• To establish optimized radiation dose levels for neonatal chest radiography.

Main Methods:

• Thermoluminescent dosimetry was used to measure Entrance Surface Doses (ESD) in 208 neonatal chest x-rays from 12 preterm neonates (28-34 weeks gestation).
• Image quality was assessed by incrementally increasing kVp and decreasing mAs until quantum noise impacted diagnostic quality.
• The optimal ESD was estimated based on these parameters.

Main Results:

• Measured ESD values for neonatal chest x-rays were found to be higher than the National Radiological Protection Board's (NRPB) Diagnostic Reference Level (DRL) of 50 μGy.
• The study identified a specific level of ESD where image quality is maintained despite increased quantum noise.
• Optimized imaging parameters were determined to reduce radiation exposure while preserving diagnostic utility.

Conclusions:

• Current radiation doses in neonatal chest radiography may exceed recommended levels.
• Establishing an optimal ESD, balancing image quality and radiation dose, is crucial for reducing exposure in neonates.
• Implementing these findings can lead to safer diagnostic imaging practices for vulnerable preterm infants.