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B-scan ultrasonography

Eye Care estimated about CNY 200-400

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Description

A diagnostic imaging technique using high-frequency sound waves to produce cross-sectional images of the eye and orbit, commonly used to evaluate intraocular structures and detect abnormalities.

Main Uses

Primary clinical uses include: evaluating posterior segment anatomy when optical media are opaque (e.g., cataract, corneal opacity, vitreous hemorrhage); detecting and characterizing intraocular tumors (size, shape, internal reflectivity, vascularity via Doppler adjunct); diagnosing retinal detachment, choroidal detachment, and vitreous opacities; measuring axial length for intraocular lens calculation (especially in high myopia or aphakia); assessing optic nerve head morphology (e.g., papilledema, optic nerve drusen); and guiding interventions (e.g., biopsy planning, radiation therapy targeting).

Normal Range

B-scan ultrasonography of the eye does not yield numerical 'values' like laboratory tests; instead, it provides qualitative grayscale images. Normal findings include: intact, smooth, and continuous scleral and choroidal echoes; a homogeneous vitreous cavity with no internal echoes (appearing anechoic); a well-defined, convex lens with uniform echogenicity; a clearly visualized retina with normal thickness (~0.2–0.3 mm) and attachment to the choroid; absence of intraocular masses, hemorrhage, or retinal detachment; axial length typically 22–24 mm in adults.

Low Values - Possible Causes

Low echogenicity (hypoechoic or anechoic areas) may indicate: 1) Vitreous hemorrhage (acute phase may appear hypoechoic before becoming echogenic), 2) Posterior vitreous detachment (PVD) with minimal debris, 3) Cystic retinal lesions (e.g., retinoschisis), 4) Optic nerve sheath cysts, 5) Aqueous-filled cysts or congenital anomalies (e.g., coloboma). Note: 'Low values' are not quantitative—this refers to reduced echo amplitude relative to surrounding tissues.

High Values - Possible Causes

High echogenicity (hyperechoic areas) may indicate: 1) Calcified intraocular tumors (e.g., retinoblastoma, choroidal osteoma), 2) Dense vitreous hemorrhage (chronic or organized), 3) Choroidal melanoma with intrinsic calcification or high cellularity, 4) Scleral buckle material (post-surgical artifact), 5) Intraocular foreign bodies (e.g., metal, glass). Again, 'high values' reflect increased acoustic reflectivity—not numeric elevation.

B-scan ultrasound eye ocular ultrasound retinal detachment ultrasound

estimated about CNY 200-400