Xin Feng1, Gang Li2, Zhenyu Qu3, Lin Liu4, Karin Näsström5, Xie-Qi Shi6. 1. Radiologist, Department of Oral and Maxillofacial Radiology, Stomatological Hospital, Dalian, China; guest researcher, Oral Maxillofacial Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden. 2. Professor, Department of Oral and Maxillofacial Radiology, School and Hospital of Stomatology, Peking University, Beijing, China. 3. Associate professor, Department of Oral and Maxillofacial Radiology, Stomatological Hospital, Dalian, China. 4. Professor, Department of Orthodontics, Stomatological Hospital, Dalian, China. 5. Chair, Oral Maxillofacial Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden. 6. Associate professor, Oral Maxillofacial Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden. Electronic address: Xie.Qi.Shi@ki.se.
Abstract
INTRODUCTION: In this study, we aimed to evaluate the adenoidal nasopharyngeal ratio (ANR) on lateral cephalograms by assessing upper airway volumes using cone-beam computed tomography (CBCT) images as the validation method. METHODS: Fifty-five patients were included in the study, and it was essential that the lateral cephalograms and CBCT images taken at their examinations were not more than 1 week apart. There were 32 subjects in group A (age ≤15 years) and 23 subjects in group B (age >15 years). The ANR was measured on the lateral cephalograms. The area and volumetric measurements of the nasopharynx and the total upper airway were obtained from CBCT images. Repeated measurements of the ANR and airway volume were performed on 10 subjects by 2 observers. RESULTS: Group A had a higher correlation (r = -0.78) between the ANR and the nasopharynx volume than did group B (r = -0.57). The ANR had a weak correlation with the total upper airway volume (group A, r = -0.48; group B, r = -0.32). Both measurements made on lateral cephalograms and CBCT were highly reproducible in terms of intraobserver and interobserver agreement. CONCLUSIONS: Based on our results, the measurement of the ANR on lateral cephalograms can be used as an initial screening method to estimate the nasopharynx volumes of younger patients (age ≤15 years).
INTRODUCTION: In this study, we aimed to evaluate the adenoidal nasopharyngeal ratio (ANR) on lateral cephalograms by assessing upper airway volumes using cone-beam computed tomography (CBCT) images as the validation method. METHODS: Fifty-five patients were included in the study, and it was essential that the lateral cephalograms and CBCT images taken at their examinations were not more than 1 week apart. There were 32 subjects in group A (age ≤15 years) and 23 subjects in group B (age >15 years). The ANR was measured on the lateral cephalograms. The area and volumetric measurements of the nasopharynx and the total upper airway were obtained from CBCT images. Repeated measurements of the ANR and airway volume were performed on 10 subjects by 2 observers. RESULTS: Group A had a higher correlation (r = -0.78) between the ANR and the nasopharynx volume than did group B (r = -0.57). The ANR had a weak correlation with the total upper airway volume (group A, r = -0.48; group B, r = -0.32). Both measurements made on lateral cephalograms and CBCT were highly reproducible in terms of intraobserver and interobserver agreement. CONCLUSIONS: Based on our results, the measurement of the ANR on lateral cephalograms can be used as an initial screening method to estimate the nasopharynx volumes of younger patients (age ≤15 years).
Authors: Antonio Mario Bulfamante; Alberto Maria Saibene; Giovanni Felisati; Cecilia Rosso; Carlotta Pipolo Journal: J Clin Med Date: 2019-09-23 Impact factor: 4.241