Résumé
ObjectiveTo clarify the feasibility of the 3D scanning volume method for distal upper limb volume measurement, and to analyze its scorer reliability and criterion-related validity. MethodsFrom January to March, 2022, a therapist (operator A) who had not been exposed to 3D scanning volume method and water displacement method was trained to use a handheld 3D laser scanner and a spilt cup to measure the volume of a PVC distal upper limb model. The operation time of 30 operations of each method was recorded. The learning curves of the two methods were plotted using cumulative sum (CUSUM) analysis. The curve was cut into the learning stage and the mastery stage by the vertex of peak. The times required to reach the mastery stage and the operation time of the mastery stage for the two methods were recorded. A total of 20 healthy subjects were recruited from Huashan Hospital of Fudan University. Two trained therapists (operator A and operator B) measured the bilateral distal upper limb volume using a handheld 3D laser scanner, and operator A measured the bilateral distal upper limb volume using a spilt cup. ResultsThe fitting learning curve of the 3D scanning volume method (R² = 0.984) reached its peak after eight times of operation; while that of the water displacement method (R² = 0.494) reached its peak after five times of operation. At mastery stage, the operator spent less time using 3D scanning volume method than using water displacement method (P < 0.05). The intraclass correlation coefficient between the two operators were both 0.979 for bilateral distal upper limb volume measure (P < 0.001). The Pearson coefficients was above 0.979 between 3D scanning volume method and water displacement method (P < 0.001). ConclusionA therapist can master the use of the 3D scanning volume method after eight times of operation, and the operation time of 3D scanning volume method is shorter than that of water displacement method at mastery stage. The 3D scanning volume method is well reliable and valid, that can be used as an alternative to the water displacement method for distal upper limb volumetric measurement.
Résumé
BACKGROUND AND OBJECTIVES: Acoustic rhinometry (AR) measures nasal cavity geometry by analyzing reflected acoustic impulses. The authors aimed to find out whether AR could reflect the volume change developed from conchotomy. MATERIALS AND METHODS: To establish the test-retest reliability of the AR, 20 normal nasal cavities were tested with AR before conducting main study. The volumes of the 31 conchotomy specimens were measured with water displacement method (WDM). The nasal volume changes in accordance with conchotomy operations were measured with AR, and the paired values were compared. RESULTS: AR revealed highly consistent results as there was statistically significant correlation between test and retest values (r=0.98, p<0.0001). The volume of the conchotomy specimens measured with WDM was 1.40+/-0.63 cm3 (mean+/-SD) and the volume change measured with AR was 1.49+/-1.48 cm3 (mean+/-SD). There was statistically significant correlation between the two values (r=0.55, p<0.01), though they were not so consistent with each other. CONCLUSION: The nasal volume change after conchotomy measured with AR correlates with the conchotomy specimen volume with statistical significance, though the correlation between them does not always show consistency.
Sujets)
Acoustique , Fosse nasale , Rhinométrie acoustique , EauRésumé
Total body fat of 12 male adults were measured by ordinary and modified water displacement method repeatedly. The mean value was 9.37 kg calculated by ordinary method.It was significantly lower than that of 10.07 kg calculated by modified method (p