Ocular Ultrasound Exam Techniques

Transverse scan: probe marker oriented either vertically or nasally (depending on position on globe- should always see nerve at the start i.e. when looking at nasal retina probe should be vertically oriented), held at superior, inferior, medial and lateral and rotated as far anterior as possible looking at opposite side of eye

Longitudinal scan: probe marker always pointing at the limbus, described in clock hours where the top of the image is oriented: 9 o'clock longitudinal scan includes the macula, optic nerve,

Axial scan: probe on center of eye, vertical and horizontal images

1. Survey 4 quadrants with transverse probe position
   1. Superior quadrant scan using horizontal transverse probe position
      1. Marker is nasal and the patient is looking superiorly to expose more of the eye
      2. Place probe on the inferior limbus and identify the optic nerve (superior in the image will be nasal)
      3. Sweep the probe down pointing the tip up to see the superior globe
   2. Inferior quadrant scan using horizontal transverse probe position
      1. Marker is nasal and the patient is looking inferiorly
      2. Place probe on the superior limbus and find the optic nerve
      3. Sweep the probe up, pointing the tip down to see the inferior globe (superior in the image will be nasal)
   3. Nasal quadrant scan using a vertical transverse probe position
      1. Marker is placed superiorly (vertical) and the patient eye is adducted (nasal rotation)
      2. Place the probe on the temporal limbus and find the optic nerve
      3. Sweep the probe temporally to visualize the nasal retina from the optic nerve anteriorly (superior in the image will be superior)
      4. In this quadrant the image can be very anterior including the iris
   4. Temporal quadrant scan using a vertical probe position
      1. Marker is placed superior and the patient has their eye abducted (temporal rotation)
      2. Place the probe on the nasal limbus and find the optic nerve
      3. Sweep the probe nasally to visualize the temporal retina from the optic nerve anteriorly (superior in the image will be superior)

B-scan exam techniques Moran Eye center