b scan of eye

B SCAN OF EYE

B SCAN

WHAT IS B SCAN

B-scan ultrasonography, or B-scan, is a diagnostic test used in optometry and ophthalmology to produce a two-dimensional, cross-sectional view of the eye and the orbit. It is otherwise called brightness scan

INDICATIONS FOR EXAMINATION IN WHICH MEDIA IS HAZY

● lid problems● keratoprosthesis,● corneal opacities (eg, scars, severe edema),● hyphema, hypopyon, ● miosis, pupillary membranes,● dense cataracts, ● vitreous opacities (eg, hemorrhage, inflammatory debris).

CONDITION IN WHICH IT IS CARRIED OUT DESPITE CLEAR VIEW

iris or ciliary body lesionsruling out ciliary body detachmentsdifferentiating intraocular tumors, serous versus hemorrhagic choroidal detachments, rhegmatogenous versus exudative retinal detachments, disc drusen versus papilledema.

Ultrasound Principles and Physics

Pulsed-echo systemTransducerAmplifierDisplay monitor

COMPONENTS OF B SCAN

PROBE POSITIONING

Transverse probe positions

Transverse scan of a choroidal melanoma. This is a lateral slice through the lesion centered at the 5:00 position left eye, with 3 clock hours represented both above (2:00, 3:00, and 4:00 positions, respectively, from the top) and below (6:00, 7:00, and 8:00 positions) the lesion.

Longitudinal probe positions

Longitudinal scan of the same choroidal melanoma. This is a radial slice through the lesion, with 1 clock hour (in this case, the 5:00 position) being represented from the optic nerve and posterior pole (at the bottom of the right side) outward to the anterior meridian

ANTERIOR SEGMENT EVALUATION .●Immersion technique●Waterbath technique

Within the last five years, the development of high resolution (50-100 Mhz) Probes have increased our ability toevaluate the anterior chamber

Set of scleral shells for immersion/waterbath

ASTEROID HYALOSIS( FIG A. & B.)

VITREOUS HAEMORRHAGE

A

B

C

VITREOUS OPACITY

Clotted Vitreous Haemorrhage

Layered Vitreous Haemorrhage

Comparison of PVD and RetinalDetachment

Vitreoschisis Persistent Hyperplastic Primary Vitreous

Total Retinal Detachment(open Funnel)

Retinal cyst formation with different amount of retinal Detachment

Retinopathy of prematurity (stage 5) With retinal detachment

Retinal pigment epithelium detachment

Sub retinal Haemorrhage

CHOROIDAL DETACHMENT

Cysticercosis with RetinalDetachment

Coloboma

Subluxated IOL

SCLERITIS