Misc Flashcards
1
Q
UBM vs Posterior segment U/S
A
Ultrasound biomicroscopy (UBM) is useful for obtaining high-resolution (e.g. 40 micron) images of the anterior segment. It accomplishes this task by using a higher frequency probe (e.g. 50 MHz), but which penetrates less (e.g. 4 mm). This is ideal since the anterior chamber is usually only 3-4 mm deep.
In contrast, B-scan ultrasound is better at imaging the posterior segment since it penetrates deeper (e.g. 4 cm) using lower-frequency sound waves. The tradeoff is decreased resolution as compared to UBM (e.g. 900 microns).
