The present invention provides a substrate, an optical fiber connecting end member, an optical element-housing member, a light module, and a manufacturing method of the substrate. Positioning mechanisms coupled between the transporter frame and the grinding element enclosure positions the grinding element relative to the pavement surface. Then, the specified digital image is processed to obtain image information associated with a right-side-up image of the specified digital image. Patient concentration values of the contrast agent for the area of lung tissue at time points T1 and T2 are obtained, and a malignancy classification for the region of lung tissue is provided by comparing the obtained sample concentration values with a predetermined malignancy profile. In accordance with the invention, a universal structural element in the form of a profile body, having preferably a substantially square cross-section, comprises on all longitudinal sides undercut grooves which are connected on the end sides by means of intersecting undercut grooves with preferably the same cross-section.