# Shared Flashcard Set

## Details

Exam 1
Metric and Physical Unit Abbreviations
42
Physics
01/05/2016

Term
 G
Definition
 Giga 109 = 1,000,000,000
Term
 M
Definition
 Mega 106 = 1,000,000
Term
 k
Definition
 kilo 103 = 1,000
Term
 h
Definition
 hecto 102 = 100
Term
 da
Definition
 deca 101 = 10
Term
 d
Definition
 deci 10-1 = 0.1
Term
 c
Definition
 centi 10-2 = 0.01
Term
 m
Definition
 milli 10-3 = 0.001
Term
 μ
Definition
 micro 10-6 = 0.000001
Term
 n
Definition
 nano 10-9 = 0.000000001
Term
 P or T
Definition
 Period (seconds)
Term
 PD
Definition
 Pulse Duration (the time for which the transmit pulse lasts)
Term
 PRP
Definition
 Pulse Repetition Period (the time to transmit and recieve an acoustic line of data)
Term
 Frame Time
Definition
 The time required to build up a frame = the time per acoustic line multiplied by the total number of lines in the frame
Term
 ƒ
Definition
 Frequency (Hz)
Term
 ƒ0
Definition
 Operating or transmit frequency of a transducer (for diagnostic ultrasound 2-12 MHz common)
Term
 PRF
Definition
 Pulse Repetition Frequency = 1/PRP (typically less than 10 kHz)
Term
 Frame rate
Definition
 The reciprocal of the frame time (typically less than 100 Hz)
Term
 Hz
Definition
 Hertz = 1 cycle/second
Term
 V
Definition
 Volts: unit of electromotive force
Term
 m
Definition
 Meters: unit of distance
Term
 Z
Definition
 Rayls: unit of acoustic impedance
Term
 R
Definition
 Resistance, either electrical or to fluid flow
Term
 P
Definition
 Pressure: mmHg, atm, dynes/cm2, kg/m2
Term
 P
Definition
 Power: units of Watts
Term
 W
Definition
 Watts
Term
 I
Definition
 Intensity = power/area = W/m2 or W/cm2
Term
 dB
Definition
 Decibels: a logarithmic power ratio
Term
 d
Definition
 distance
Term
 λ
Definition
 Lambda: wavelength which has units of distance
Term
 SPL
Definition
 Spatial Pulse Length
Term
 NZL
Definition
 Near Zone Length, the distance from transducer face to the natural focus
Term
 ρ
Definition
 Density = mass/volume : units of kg/m3
Term
 r
Definition
Term
 d
Definition
 Diameter of a circle = 2x radius
Term
 A
Definition
 Area: units of m2
Term
 Vol
Definition
 Volume: units of m3
Term
 Q
Definition
 Volumetric flow: units of volume per time, or m3/sec
Term
 r
Definition
 Rate: the general term usually used in the distance equation for velocity
Term
 v
Definition
 velocity of blood: units of m/sec
Term
 c
Definition
 propagation speed of sound: units of m/sec
Term
 ΔP
Definition
 Pressure gradient (change in pressure = P1 - P2 where P2 is the distal pressure and P1 is the proximal pressure)
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