Chapter 4 Instruments -notes 2

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1

Where is the Pulser located?

Beam Former

Pulser - Receives a signal from the master synchronizer then sends a voltage to the element.

Pulser varies signal

2

Where is the Pulse Delay located

Beam Former

Pulse Delay - (sequencing and phasing) to control the shape and direction of the beam.

-steering
-focusing
-aperture
-apodization

3

Where is the beam transmitted and received by the system?

Beam Former

4

Where is the Amplifiers located

Beam Former

Amplifiers - Time gain Compensation

5

Where is the ADC located

Beam Former

ADC - Analog to Digital converter - converts varying voltage into discrete #'s

6

Where is the Echo Delay located

Beam Former

7

Where is the Summer located

Beam Former

Summer - responsible for a single line of information by receiving and sorting all channels of info.

sums up all information
Apodization
Aperture
creation of single line of information

8

Beam Former all Parts

Creates Pulse
*Pulser
*Pulse Delay

Amplification
*Time Gain Compensation

ADC
*convert analog to digital

Summer
*Dynamic Focus
*Dynamic Aperture
*Apodization

9

Where is Band Pass filter located?

Tuned Amplifier (signal processor)

10

Where does Filter/Rejection occur?

Signal Processor

11

Where does Demodulation occur?

Signal Processor

12

Where does Modulation occur?

Signal Processor

Modulation - conversion of the signal to a form that is more suitable for TV display

13

Where does Compression occur?

Signal Processor

14

Where does Pulse Inversion occur?

Signal Processor

Pulse Inversion - A second pulse opposite of 1st is fired at same time

15

Where does Rectification occur?

Signal Processor

Rectification - turns all negative voltages into positive

16

Where does Smoothing occur?

Signal Processor

Smoothing - creates envelop around the voltages and take all spikes out which creates nicer image

17

Name the path of Transmission in the Beam Former.

pulser
pulse delays
transmit / receiver
Transducer

18

Name the path of Reception in the Beam Former.

transducer
transmit / receiver
amplifier
ADCs
echo delays
summer

19

Name the path of the Signal Processor.

Filter/rejection
-High pass filter - Harmonics

Demodulation
-Rectification
-Smoothing

Compression

20

Name the path of the Image Processor.

scan converter
pre-processing
image memory
post processing
DAC

21

What is compression?

varying the differences so that all voltages are closer to equal

22

Where is the Scan Converter?

Image Processor

23

Where does the Pre-processing and Post-Processing occur?

Image Processor

24

Where is the image memory?

Image Processor

25

Where is the D.A.C.

Image Processor