| 摘要 |
<p>Immunoassay tests run on samples of body fluid may be screened in the screening device and the lines formed by the immunoassay testing are interpreted to detect the presence of particular compounds such as drugs in the body. Light from an LED 44 is shone onto the window of an immunoassay test cartridge 10 illuminating a test membrane. Light reflected from the membrane 24 is reflected by a mirror 40 into the field of view of a charge coupled device 34. The image is digitised and outputted by video data interface to a CPU 80 for data processing. The digitised data is segmented according to preset data defining control regions test regions and background regions on the test membrane. The segmented data for the test region is compared to the data from the control region and the background regions to determine whether the test data exhibits any significant results compared to the control region and background regions. The results of the comparison are outputted to a liquid crystal display. The results may be displayed as either positive or negative for any particular substance or the concentration of the particular substance may be displayed. The screening device incorporates a timer which is activated when an immunoassay test cartridge is inserted into the device to ensure that an appropriate delay occurs to allow the immunoassay test to run correctly.</p> |
