Gammex 405 GSX LE, Руководство пользователя

Страница: 9 / 26

9
Freeze an image of the vertical pin targets. Use the electronic calipers to
measure the horizontal width of the pin targets in the near, mid and far fields of
the image.
Notice how the pin targets are narrowest in the focal zone. The pin width demon-
strates the width of the ultrasound beam at that depth and approximates the
lateral resolution of the scanner.
7. Decrease the image depth and examine the axial resolution target group at 3 cm.
Notice how the images of the lower pin targets may begin to merge. The smallest
distance between two pins that can be clearly resolved with no vertical overlap is
called the scanner’s
axial resolution .