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Tor 18fg-type x-ray model, leds tor 18fg integrated imaging performance model, which routinely integrates line-to-card and low-comparison test points on a metal plate and shows corresponding readings on the surface to facilitate the rapid detection of routine detection of equipment. Stability tests for visual and indirect visual systems。
The tor 18fg module, as a conventional test module, allows for rapid and easy continuous monitoring of system imaging performance on a weekly or monthly basis, especially for those relying on regular maintenance equipment. Upon completion of the initial greyscale test, only the details of the detected images and the number of bar charts are counted to quantify the image quality. The continuous tracking of these data will facilitate the performance of the user tracking system, the timely forecasting and calibration of potential problems。
Leeds tor18fg is a common model designed to be used weekly and/or monthly to provide continuous check-ups of imaging performance, especially those most susceptible to deterioration. After the initial ashscale check, the image quality can be measured only by calculating the number of details detected and the number of bar patterns analysed in the image. The continued recording of these figures will reveal any trend in the deterioration of imaging performance。
The 142nd task force of the american association of medical physics (aapm) (tg-142) recommended that surface kv imagery be checked during the monthly quality assurance (qa) period in table ii: images。
The following checks may be carried out:
Show screen brightness and contrast adjustments (high and low light details)
Resolution limits (0. 5 to 5. 0 lp/mm)
Low contrast large detail detection capability (18 details, diameter 8 mm)
Circle geometric graphics (guide circle)
Tor 18fg model in a protective box with 1 x copper filter 1. 0 mm x 150 mm x 150 mm
Method of use: tor 18fg module is a body model designed to detect the mass of x-rays, consisting of a disk-shaped model and a 1 mm thick copper plate. 18 disks with a diameter of 8 mm for detection of low contrast resolution, ranging from 0. 9% to 16%; 21 groups of fine lines for detection of resolution, each with 5 lines, with a range of 0. 5-5 lp/mm. Copper is mainly used for filtering. After exposure, the number of small discs that can be clearly identified on a fine number of images, and based on the comparison table provided by the manufacturer, can read the value of the low contrast resolution. The more small discs you can show, the better the low contrast resolution. In the white small box in the center of the image, the order from the top to the left, and from the left to the right, read and take a clearly identifiable strip number, check the texture-resolution comparison table provided by the manufacturer, and determine the value of the resolution between squares。