Advances in Ultrasound Imaging of the Retina and Choroid

Until recently, ultrasound imaging of the retina has not been very effective. A frequency of 10 MHz allows for the detection of a retinal detachment. At 20 MHz, the choroid and sclera can be seen. New advanced digital processing techniques can provide better resolution for enhanced screening. Wavelet imaging provides increased boundary enhancement and can provide color images as well, although greyscale images provides better definition. Harmonic imaging is another strategy that can provide an increased amount of detail and is particularly useful for viewing inflammation. This strategy may be beneficial for examining patients with diabetic retinopathy, as well as for examining the effectiveness of a variety of treatments in these patients. Swept mode imaging is a technique that provides integrated imaging to accurately measure blood flow. Swept mode imaging can be useful for examining patients prior to and following photodynamic therapy. These advances in ultrasound imaging allow for better assessment and stratification of architectural changes, and they provide an improved method for evaluating the effects of both local and intraocular treatment.