The contrast of a CT image displayed on a monitor may be increased by

C: Decreasing the width of the “window” means restricting the range of gray scale displayed on the monitor screen (0 to 255), to a more limited range of the available Hounsfield numbers (−1000 for air, to 3000 for dense bone). A lung window may be −1250 to +250; a soft tissue window may be −160 to +240; a bone window may be −650 to +1350.