ULTRASOUND MIDTERM: TOPIC 4

ultrasound artifact

An __ is an additional, missing or distorted image which does not conform to the real image of the part being examined.

- Reverberation

- Acoustic Shadowing

- Acoustic Enhancement

- Edge Shadowing

- Side Lobe Artifacts

- Mirror Image

- Double Image

- Equipment-generated Artifacts

DIFFERENT TYPES OF UTZ ARTIFACTS

REVERBERATION

This is the production of spurious (false) echoes due to repeated reflections

REVERBERATION

Comet tail

REVERBERATION

Artifacts appearing as parallel, equally spaced lines

REVERBERATION

are a result of the presence of two or more strong reflecting surfaces

REVERBERATION

Shotgun wound

ACOUSTIC SHADOWING

This appears as an area of low amplitude echoes (hypoechoic or anechoic) behind an area of strongly attenuating tissue.

gas

ACOUSTIC SHADOWING: If the shadowing contains ringdown echoes, it is likely to be __

calculus

ACOUSTIC SHADOWING: If the shadowing is clear shadowing, absent of any ringdown, it is likely to be a __

ACOUSTIC SHADOWING

Calcified mass

ACOUSTIC ENHANCEMENT

This artifact appears as a localized area of increased echo amplitude behind an area of low attenuation.

urinary bladder, the gallbladder or a cyst

ACOUSTIC ENHANCEMENT Can commonly be seen distal, posterior, behind to fluid filled structures such as: __

ACOUSTIC ENHANCEMENT

Can commonly be seen distal, posterior, behind to fluid filled structures

ACOUSTIC ENHANCEMENT

is caused by weakly attenuating structures.

ACOUSTIC ENHANCEMENT

Fluid filled mass

EDGE SHADOWING

Occurring at the edges of rounded structures

SIDE LOBE ARTIFACT

The energy within the ultrasound beam exists as several side lobes radiating at a number of angles from a central lobe.

MIRROR IMAGE ARTIFACT

These artifacts result in a mirror image of a structure.

MIRROR IMAGE ARTIFACT

They arise due to specular reflection of the beam at a large smooth interface.

MIRROR IMAGE ARTIFACT

fluid-air interface.

MIRROR IMAGE ARTIFACT

Diaphragm, Heart, Liver

DOUBLE IMAGE ARTIFACT

This artifact is caused by refraction of the beam and may occur in areas such as the rectus abdominis muscle on the anterior abdominal wall.

EQUIPMENT-GENERATED ARTIFACT

Incorrect use of the equipment controls can lead to artifacts appearing.

EQUIPMENT-GENERATED ARTIFACT

↑GAIN = ↑NOISE

↑

↑GAIN = __NOISE