Units/ Units Of Measure

Question 0

Theta
Lambda
Mu

Answer 0

Theta : angle
Lambda: wavelength
Mu: micro

Question 1

Alpha
Gamma
Delta

Answer 1

Alpha: Frequency
Gamma: viscosity
Delta: difference

Question 2

Pi
Rho
Sigma
Tau

Answer 2

Pi: math constant 3.14
Rho: tissue density
Sigma: wall stress
Tau: time constant of ventricular relaxation

Question 3

Amplitude

Answer 3

Db decibels: log scale describing the amplitude (loudness) of sound wave

Question 4

Angle

Answer 4

Degrees 3.14/180 rad.

Eg intersect angle

Question 5

Frequency

Answer 5

Hz : cycles per second
kHz : 1000 Hz
MHz: 1 million Hz

Question 6

Length

Answer 6

Cm 1/100 m

Mm 1/1000m or 1/10 cm

Question 7

MmHg

Answer 7

1 mmHg=1333.2 dynes/cm2

Question 8

Resistance

Answer 8

Dyne.s.cm^-5

Question 9

Time

Answer 9

Sec
ms 1/1000 sec
Micro

Question 10

Ultrasound intensity

Answer 10

W/cm2 Where watt (W) = joules/sec

And joule=m^2 x kg x s^-2

Question 11

Velocity

Answer 11

m/sec

Cm/sec

Question 12

VTI

Answer 12

Velocity time integral
cm
Integral of Doppler velocity curve (cm/sec) over time (sec)
Unit is cm

Question 13

Volume

Answer 13

cm^3
mL
L ( 1000 mL)

Question 14

Q

Volume flow rate

Answer 14

L/min

ml/sec

Question 15

Wall stress unit

Answer 15

Dynes/cm^2
Kdyne/cm^2
kPa kilopascals 1 kPa=10 kdyn/cm^2

Question 16

Units for:
Tissue Doppler
Strain rate
Strain
Speckle tracking

Answer 16

M/sec or CM/sec (tissue Doppler )
Strain: rate l/sec
Strain: unitless
Speckle tracking: unitless