ABSTRACT
OBJECTIVE@#To establish a method for measuring the photoelectric performance index (luminance response characteristic and luminance tolerance) of medical electronic endoscope.@*METHODS@#Based on the clinical application and product features of medical electronic endoscope, the umbrella grayscale test chart and the adjustable gray scale test chart are designed and made from two aspects of distribution and density differential.@*RESULTS@#The influence of gray scale arrangement, background illumination intensity and illumination spectrum on photoelectric performance measurement of electronic endoscope is verified by test.@*CONCLUSIONS@#It is a reference for the design analysis, evaluation and modification of electronic endoscope product photoelectric part, whether it is suitable for fast detection of umbels and more accurate gray scale test chart.
Subject(s)
Electronics, Medical , Endoscopes , Light , Quality ControlABSTRACT
Objective To investigate serum angiopoietin-2(Ang-2)levels in non-small cell lung cancer(NSCLC)and its clinical significance.Methods Patients with NSCLC(n=98)and healthycontrols (n=30)were recruited into this study.Serum Ang-2 levels were measured using enzyme-linked immunosorbent assays(ELISA).The results were compared between patients with ifferent tumor stages,metastasis status,and postoperative recurrence 1 year after surgery.Results Patients with NSCLC had higher Ang-2 levels[median 3 230.5 ng/L,range(1 231.6～4 612.5)ng/L ]than the control group [median 831.7 ng/L,range(592.4-1 701.1)ng/L,U=15,P<0.01].Serum Ang-2 levels in stage Ⅲpatients[median 2 311.7 ng/Lrange(1 512.9～3 530.7)ng/L]were significantly higher than stage I [median 1 593.6 ng/L,range(1 235.2～2 763.1)ng/L,H=27.66,P<0.01]and stage Ⅱ patients [median 1 581.4 ng/L,range(1 231.6～2 852.3)ng/L,H=27.66,P<0.01],but significantly lower than stage Ⅳ patients[median 3 808.2 ng/L,range(2 235.8～4 612.5)ng/L,H=65.6P<0.01].Serum Ang-2 levels were higher in patients with distant metastasis or postoperative recurrence than those without them.Conclusion Serum Ang-2 level in patients with NSCLC could be a useful marker for metastasis and postoperative recurrence.