Spirometry-Assisted High Resolution Chest Computed Tomography in Children: Is it Worth the Effort?

Area of Science:

• Radiology
• Pediatric Imaging
• Pulmonary Diagnostics

Background:

• High-resolution chest computed tomographies (HRCTs) require precise breath holds for optimal image quality.
• Motion artifact and atelectasis can compromise HRCT image quality in pediatric patients.
• Voluntary breath holds in children may be insufficient for consistent, high-quality HRCTs.

Purpose of the Study:

• To evaluate the effectiveness of spirometry-assisted breath holds in improving pediatric HRCT image quality.
• To compare image quality metrics between spirometry-assisted and voluntary breath holds in children.
• To determine if spirometry assistance reduces motion artifact and atelectasis in pediatric HRCTs.

Main Methods:

• Retrospective case-control study comparing HRCTs before and after implementing a spirometry-assisted protocol.
• Spirometry-assisted scans (cases) were matched with voluntary breath hold scans (controls) by age, gender, and diagnosis.
• Two blinded pediatric radiologists evaluated image quality parameters.

Main Results:

• Spirometry-assisted CTs demonstrated a significantly greater difference in lung density between inspiratory and expiratory phases (+222 HU) compared to voluntary breath holds (+140 HU).
• Mean inspiratory image density was significantly higher in spirometry-assisted scans (-852 HU) versus voluntary scans (-828 HU).
• No significant differences were observed in the prevalence of motion artifact or atelectasis between the two groups.

Conclusions:

• Spirometry-assisted CTs significantly enhance the lung density difference, improving the detection of air trapping in pediatric patients.
• While spirometry assistance improves lung density metrics, it did not yield a significant reduction in motion artifact or atelectasis.
• This technique shows promise for improving functional lung imaging in children undergoing HRCT.