MIDTERM SOCRATIVE

Question 1

How does intensity relate to power and amplitude

Answer 1

I = P/A or I = Amp^2

Question 2

What factors will increase both the spatial peak and spatial average intensities?

Answer 2

1. Increasing power output then all intensities go up
2. Increase the intensity
3. Increase focus

Question 3

What are three types of studies used to determine the effects ultrasound on tissue?

Answer 3

1. Epidemiology studies
2. In Vivo
3. In vitro

Question 4

What are the intensity thresholds for unfocused and focused transducers respectively?

Answer 4

<100 mW/cm^2

Question 5

What are the two types of cavitation possible when using ultrasound in soft tissue?

Answer 5

Stable and transient

Question 6

What are the three abbreviations of thermal indices used in ultrasound?

Answer 6

TIS, TIB, TIC

Question 7

What is the maximum values for TI and MI

Answer 7

TI = 6 and MI = 1.9

Also a significant increase would be 1.5 for TI

Question 8

Explain the difference between dynamic and static elastography

Answer 8

Static elastography uses pressure to compress a vessel to estimate tissue density

Dynamic uses shear waves

Question 9

Do softer tissues have higher strain values or lower ones?

Answer 9

Higher strain

Question 10

When performing liver elastography, the sample should be at least 1.5 deep to the tissue to avoid reverberation artifacts, T/F?

Answer 10

True

Question 11

How far from vessel wall should elastography sample be taken at a minimum?

Answer 11

5mm

Question 12

What is a voxel?

Answer 12

Volume of pixels

Question 13

What plan is referred to as the “C-Plane” in typical multiplanar reconstructions?

Answer 13

Coronal

Question 14

Multislice or tomography allows the operator to align protocols similar to CT and/or MRI imaging? T/F

Answer 14

T

Question 15

What type of probe is required to achieve biplane imaging?

Answer 15

Matrix probe