> X-ray grid > X-ray grid Superior construction of lead strips and with smooth, enameled aluminum cover, sealed against dirt and moisture. Grids may also be ordered with carbon fiber composite covers. For added protection of your valuable grids and convenience of handling and operation, Soyee grids can be installed in various forms of grid encasements: Flat Lexan® Encasements, grid caps, Lexan® encasements with cassette channels and grid cassettes.     To obtain the most effective X-ray transmission and absorption, as well as grid density uniformity and precise geometric arrangement for strip focusing, Soyee® Utilizes the finest precision materials, such as aluminum strips with purity of 99.99% and a thickness tolerance of ± 0.02mm, and lead strips with a purity of 99.85% and a thickness tolerance of ±.001mm.     Each grid strip is laminated and baked after the gluing procedure. This ensures absolute rigity between the strips. as well as heat and moisture resistance & completely prevents Warping and cracking over the course of time. Each grid is subjects to radiographic testing prior to shipment, and only those grids which have passed the test for perfect strip alignment are delivered to our customers. The test film supplied with all our grids is your assurance of quality.       60 lines/inch (23 lines/cm) 103 lines/inch (40 lines/cm) 72 lines/inch (28 lines/cm) 130 lines/inch (51 lines/cm) 85 lines/inch (34 lines/cm) 150 lines/inch (60 lines/cm)   Standard focal ranges available: Short(26" -32"), Medium(34" -44), Long(40" -72", 48" -72", or 60" -72) and infinity (parallel). Special focal ranges may be accommodated per your specifications.   In case of 8:1 ratio grid has been made with a true focus of 38", it can be used satisfactorily from 34" to 44". With lower ratio grids focal range is considerably winder, with higher ratio grids it is considerably narrower. In case of 12:1 ratio grids it would have a range of only 36" to 40"     Parallel grids are used for operational research and traumatology since exact centering is impossible in this case. The scattered radiation absorbing strips are vertical and parallel to the grid surface. The strips, generally, run parallel to the long dimension of the grid. In order to get a vivid radiograph, focal distance of parallel grids must be 150cm-infinity since the scattered radiation absorbing strips are not exactly parallel to the diverging radiation.