[Intraobserver reproducibility study of parameters for measurement of position and height of ciliary process by ultrasound biomicroscopy].
OBJECTIVE
To search for suitable measurement parameters for the study of the position and height of cilliary process by ultrasound biomicroscopy (UBM), to test the intraobserver measurement reproducibility of the new parameters we designed as well as the old ones.


METHODS
Five parameters: TCPD, A angle, B angle, theta 4 angle and T value, are measured in 21 pieces of UBM image by one observer on five separate occasions. The intraobserver reproducibility is assessed by calculating the coefficient of variation (CV) and the difference among the parameters is tested by grouped T-test.


RESULTS
Among 21 images, parameter A angle and T value have no image with CV > 10%, TCPD and B angle have 2 respectively and theta 4 angle has 5. As to average variation level, A angle is lower than TCPD, theta 4 angle is higher than TCPD, both differences of which are significant, and B angle and TCPD are about the same level, the difference between them is not significant.


CONCLUSIONS
Among all the parameters reflecting the position of ciliary process in UBM image, A angle has the best intraobserver reliability, TCPD and B angle are less reliable, theta 4 angle has the worst reliability. The parameter reflecting the height of ciliary process, T value has very good intraobserver reliability.
Yang
H
H
Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China.
Lin
Z
Z
Chen
X
X
Wang
N
N
D000293:Adolescent; D000328:Adult; D000869:Anterior Eye Segment / Q000033:anatomy & histology* / Q000648:ultrastructure; D000886:Anthropometry; D002924:Ciliary Body / Q000033:anatomy & histology* / Q000648:ultrastructure; D005260:Female; D006068:Gonioscopy / Q000379:methods; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007498:Iris / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D008297:Male; D008853:Microscopy / Q000379:methods; D015588:Observer Variation; D015203:Reproducibility of Results; D014463:Ultrasonography