Analysis on correlation of children adenoid size and nasopharyngeal volume with CT volume model / 中国医学影像技术

ABSTRACT

Objective: To explore the relationship of children adenoid and nasopharyngeal volume using upper airway model established with CT volume scanning and three-dimensional reconstruction technology, and to analyze the impact of obstructive sleep apnea hypopnea syndrome (OSAHS). Methods: Nasopharyngeal CT images of 109 children were collected. After reconstruction of all images, the size of adenoid (A/N value) and nasopharyngeal cavity volume were measured and calculated. The children were divided into normal group and hypertrophic group according to A/N value, also OSAHS group and non-OSAHS group according to whether had OSAHS or not. The indexes were compared between normal group and hypertrophic group. The correlation of A/N value and nasopharyngeal cavity volume in different genders and ages were analyzed, and the impact of OSAHS on the relationship of A/N value and nasopharyngeal cavity volume was observed. Results: Nasopharyngeal volume of hypertrophic group ([3 111.67±1304.73]mm3) was smaller than that of normal group ([4 960.55±2 036.14]mm3,P<0.01). A/N value of hypertrophic group (0.69±0.11) was greater than that of normal group (0.45±0.97, P<0.01). The nasopharyngeal volume was negatively correlated with A/N value in both genders (rmale=-0.43, rfemale=-0.42, both P<0.01). The correlation coefficient of A/N value and nasopharyngeal volume in children <5 years old (r=-0.43) was less than that in children aged 6-10 years old (r=-0.49), and of OSAHS group (r=-0.60) was higher than of non-OSAHS group (r=-0.33). Conclusion: Negative correlation of adenoid size and nasopharyngeal cavity volume exists, which is of age difference. Compared with non-OSAHS children, adenoid size is obviously correlated with nasopharyngeal cavity volume in children with OSAHS.