iaea human health series publications - SEDIM

FIG. 36. Using the photometer to measure monitor luminance with the TG18-UNL10 (left) and TG18-UNL80 test patterns (right).(11) For primary displays, use the magnifying lens to verify that the finest (Nyquist) vertical and horizontal highcontrast bars in the line pair patterns (C) are visible in all four corners and record the status on Chart 13(b) inAnnex II.(12) For primary displays, measure the lengths of the horizontal and vertical 5 cm rulers using the displaysoftware’s measurement tool and record the lengths in millimetres.(13) If the display system uses two monitors, repeat steps 2 through 12 on the second monitor and ensure thatimages on both monitors have the same appearance.(14) Load the MTF or resolution images taken on the acquisition workstation (one in contact mode and onemagnified).(15) Measure the physical size of the square or resolution pattern on the phantom along one edge in both thevertical and horizontal directions, and enter these values on Chart 13(b).(16) Using the annotation tool, measure the size of the square or resolution pattern in the same locations for bothcontact and magnification images, and enter these values on Chart 13(b). This must only be done on onemonitor, but it must be done on each separate workstation,(17) If the monitor is a primary display device, display the TG18-UNL10 image.(18) Measure and record the luminance in the five squares indicated (top left, top right, middle, bottom left andbottom right) in Fig. 36.(19) Inspect the image for artefacts such as dead or bright pixels (LCD monitors only), scratches and otherbrightness non-uniformities.(20) Repeat steps 14 through 16 with the TG18-UNL80 image.122