Rates Flashcards
1
Q
Prop speed of air
A
330 m/s
2
Q
Prop speed of lungs
A
660 m/s
3
Q
Prop speed of water
A
1480 m/s
4
Q
Prop speed of soft tissue
A
1540 m/s
5
Q
Prop speed of liver
A
1555 m/s
6
Q
Prop speed of blood
A
1560 m/s
7
Q
Prop speed of bone
A
4080 m/s
8
Q
Infrasound
A
<20 Hz
9
Q
Audible
A
20-20,000 Hz
10
Q
Ultrasound
A
> 20,000 Hz
11
Q
DMS
A
Between 2 and 15 MHz
12
Q
+3 dB
A
Double
13
Q
-3dB
A
One half
14
Q
+6 dB
A
Quadruple
15
Q
-6 dB
A
One fourth
16
Q
+10dB
A
X10
17
Q
-10dB
A
1/10
18
Q
+20 dB
A
X100
19
Q
-20dB
A
1/100
20
Q
Average rate of attenuation in soft tissue
A
0.7 dB/cm/MHz
21
Q
SP/SA factor
A
Usually >1
22
Q
Round trip time
A
13 us/cm
23
Q
8 bits of memory
A
256 shades of gray
24
Q
1 byte
A
8 bits
25
Q
Capacitance of veins
A
2/3 of blood in body
26
Q
Turbulent flow
A
Reynolds’s number >2000
