Intro to Ultrasound Flashcards
Ultrasound can differentiate fluid from soft tissue. True/False?
True
Ultrasound has ionising radiation. True/False?
False
Name 6 indications for Ultrasound
- Cardiac function
- Abdomen/thorax for free fluid
- Parenchymal changes
- Intra-luminal changes
- Vascularity
- FNAs/biopsy guide
What does the transducer do?
Converts one form of energy to another (electrical energy to sound waves)
What does the transducer house?
Piezoelectric crystal
What does the piezoelectric crystal do?
Send and receive sound waves
What % of sound is sent and what is received?
Send 1%, receive 99%
The brightness of each dot is _______ to the ______ of the echo/reflection back from location
The brightness of each dot is proportional to the intensity of echo/reflection back from the location
Ultrasound waves travel through tissue. True/False?
True
Bright waves = ?
Bright waves = reflected by solid and gas
Dark waves = ?
Dark = absorbed by fluid
Define echogenicity
Appearance of tissues on ultrasound based on their ability to reflect sound waves.
Define anechoic
Echo free (black)
Define Hypoechoic
Sparse echoes, fluid or soft tissue (grey)
Define Hyperechoic
Bright echoes, gas or bone (white)
