Ultrasound Imaging Components
List the 5 Ultrasound imaging components
Pulser
Transducer
Receiver
Memory
Display
8 bits is equal to:
One byte
What are the two types of memory?
Analog & Digital
____________________________ allows the sonographer to alter echo signals prior to being stored in computer memory.
Preprocessing
Intensity Formula
Intensity = Power/Area
What machine control compensates for echo information that is decreased due to attenuation?
TGC's - Time Gain Compensation
When pixel density increases __________________ increases as well.
Spatial Resolution
What type of memory is used in ultrasound?
Digital
Name 3 examples of Preprocessing functions
TGC's/Gain
Compression
RES or Write Zoom
Attenuation Coefficient
Frequency/2
_____________________ is the relationship between the weakest and strongest echoes
Compression
How many shades of gray can each pixel store?
1 shade of gray
Memory is also known as:
Scan Converter
True or False?
Changes in preprocessing controls will affect the numbers that are stored in the memory
True
Wavelength Formula
Propagation Speed/Frequency
What are the 5 functions of the receiver?
Amplification
Compensation
Compression
Demodulation
Rejection
How many shades of gray can be displayed with 5 bits?
32 shades of gray
When information is stored digitally, incoming charges are collected in analog form and then stored in digital form as _________________________.
Binary Numbers
Postprocessing is anything the sonographer can change after the image is frozen.
Caliper placement
Black/White Inversion
Zoom
Post Processing Curve
Pulse Duration
#cycles x Period
What is the only function of the receiver that the sonographer cannot control?
Demodulation
16 bits is equal to:
A word
How many bits are in this binary number and how many shades of gray would be present?
110100
6 Bits - 64 Shades of gray
_________________ is a type of frame averaging used to make the image appear smoother
Persistence
Near Zone Length
Transducer Diameter squared x frequency/6