patency (plural patencies). ( 1 medicine) The degree of openness of a tube, such as a blood vessel or catheter; the relative absence of blockage. ( 2 uncountable) Obviousness; clarity.
Maximum Length: 16' with a standard cable, Up to 50' with a high quality cable. VGA is an analog signal and so as distance increases the quality will decrease. A lot of factors can determine the maximum cable length, but for low resolutions (up to 800x600) you can reach 100 feet and beyond without too much trouble. For mid-range resolutions of 1280x1024/1024x768 you can typically reach somewhere between 50 to 100 feet.
An 86-year old man had a non-contrast thoracic CT for evaluation of a chest x-ray abnormality. Incidentally, the CT scan showed diffuse increase in liver density with Hounsfield units of 105. The normal unenhanced attenuation value is between 55-65 Hounsfield units in a normal liver on CT scan without contrast (1). Hepatic attenuation is reflected in Hounsfield values and depends on combinations of factors including the presence or absence (as well as phase) of IV contrast administration.