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Airway evaluation in children with use of ultrafast CT: pitfalls and recommendations
A S Brody1, J P Kuhn, F G Seidel
1Department of Radiology, Children's Hospital of Buffalo, NY 14222.
Insights
For diagnosing pediatric airway conditions, combining both cine CT and high-resolution CT offers the highest accuracy. This dual approach improves upon individual ultrafast CT techniques for evaluating airway abnormalities in children.
Area of Science:
- Pediatric Radiology
- Diagnostic Imaging
- Airway Diseases
Background:
- Ultrafast computed tomographic (CT) imaging offers rapid evaluation of the pediatric airway.
- Two primary modes exist: 50-msec low-resolution cine CT and 100-msec high-resolution CT.
Purpose of the Study:
- To prospectively compare ultrafast CT imaging strategies against endoscopy for pediatric airway evaluation.
- To determine the optimal ultrafast CT imaging approach for diagnosing airway abnormalities in children.
Main Methods:
- Prospective study involving 20 children undergoing ultrafast CT and endoscopy.
- Comparison of cine CT alone, high-resolution CT alone, and a combined approach with endoscopy findings.
- Analysis of diagnostic agreement for various airway pathologies.
Main Results:
- Cine CT agreed with endoscopy in 10/17 cases, misinterpreting focal stenosis as tracheomalacia in 5 instances.
- High-resolution CT agreed with endoscopy in 10/14 cases.
- The combined high-resolution and cine CT technique showed agreement in 10/11 cases, missing only one tracheoesophageal cleft.
Conclusions:
- A combined ultrafast CT strategy utilizing both cine and high-resolution modes provides the greatest diagnostic accuracy for pediatric airway evaluation.
- Individual ultrafast CT modes have limitations in differentiating specific airway pathologies.
Abstract:
Ultrafast computed tomographic (CT) evaluation of the airway can be performed with either 50-msec low-resolution images (cine CT) or 100-msec high-resolution images (high-resolution CT). To determine the best imaging strategy for ultrafast CT of the pediatric airway, the authors prospectively compared ultrafast CT and endoscopy in 20 children. Both studies were performed in 11 patients; cine CT alone was performed in six and high-resolution CT alone in three. Six patients had normal anatomy. Six patients had focal tracheal stenoses, four had tracheomalacia or laryngomalacia, one had a laryngoesophageal cleft, one had irregularity and narrowing in the subglottic area, one had laryngeal papillomas, and one had focal stenosis with stoma granuloma. Cine CT results agreed with those of endoscopy in 10 of 17 cases. In five cases focal stenosis was misinterpreted with cine CT as tracheomalacia. High-resolution CT results agreed with those of endoscopy in 10 of 14 cases. The results of a technique that combined high-resolution CT for the entire airway and cine CT at selected areas agreed with those of endoscopy in 10 of 11 cases; only a tracheoesophageal cleft was missed with the combined technique. For the greatest diagnostic accuracy with ultrafast CT in evaluation of the pediatric airway, both cine and high-resolution modes should be used.