Contrast ultrasound

CEU

contrast enhanced ultrasound

HI

harmonic imaging

UCA

ultrasound contrast agents

Criteria for contrast agents

Non toxic

Small enough to make it through the pulmonary capillary beds

Have a stable shell for multiple circulations

RES

reticuloendothelial system

Microbubbles first __________ then ______

oscillate then rupture

Rupture of microbubbles results in random Doppler shifts appearing as transient

mosaic of colors

GSHI

grayscale harmonic imaging

Harmonic imaging creates a _________ ratio

higher signal to noise ratio

The MI should be _______ for contrast imaging

low

Liver phases

first: arterial or early vascular phase

second: portal venous phase

third: late vascular phase

pooling of contrast-containing blood at the periphery of the lesion and increased echogenicity of the normal liver parenchyma

hemangioma

This lesion becomes echogenic in the arterial and portal venous phases and then becomes hypoechoic in the later phases

hepatocellular carcinoma

This mass becomes echogenic in the early phases but then in the late phases remains isoechoic to the liver parenchyma

liver FNH