Which frequency is typically used to obtain B-scan imaging?

B-scan imaging in ophthalmology is typically performed using a frequency around 10 MHz. This frequency strikes a balance between image resolution and penetration depth. Higher frequencies, such as 15 MHz and 20 MHz, provide better resolution but have reduced penetration, making them less suitable for examining deeper structures in the eye. On the other hand, frequencies lower than 10 MHz can penetrate deeper but sacrifice image detail.

In clinical practice, a 10 MHz frequency is ideal as it provides sufficient detail to visualize intraocular structures, such as the retina, vitreous, and choroid, while still allowing enough penetration to evaluate potential pathologies. Therefore, the choice of 10 MHz for B-scan imaging maximizes diagnostic capabilities in a standard clinical setting.