ultrasound - Radiography Lecture

Is sedation needed for ultrasound?

NO

What are the common areas examined with ultrasounds?

Heart

abdomen

eye

tendons

reproductive tract

What type of energy is used in ultrasounds?

Sound waves

How many shades of gray are shown in ultrasonography?

256

What creates the ultrasound beam within the ultrasound transducer?

piezoelectric crystal

When would you use a higher frequency?

Greater image quality of limited depth of tissues

What does the color red signify in a doppler ultrasound?

Blood moving towards the transducer

What is the term for body tissues reflecting or absorbing sound waves differently?

Acoustic impedance

What body part is not ideal to use ultrasound on?

Chest/lungs - unless looking for fluid

How does mineral or bone appear on ultrasonography?

Highly reflective and cannot penetrate

What is attenuation of the wave?

Decrease in amplitude intesity of a sound wave as it travels through tissue

Which body type absorbs sound waves?

Fluid

What scatters sound waves in ultrasonography

Gas

What percent of attenuation due to absorption of sound waves in soft tissue?

80%

What color does Anechoic appear?

Black - no echos reflected

What is considered Anechoic?

Fluid

What does Hypoechoic reflect?

few echos

What color does Hyperechoic reflect

white

What color does hypoechoic reflect?

Dark gray

What does Isoechoic refer to?

Area appears similar to its surrounding tissue