CH 6 Part 1 & 2

Question 1

( T/F) medical X-ray units can either be diagnostic or therapeutic

What is the difference?

Answer 1

True
Diagnostic: general procedures
Therapeutic: treatment

Question 2

Most common table top?
What must the X-ray table top be?

Answer 2

Bakelite
Radiolucent

Question 3

Advantages of a curved X-ray table top and usually found with what?

Answer 3

More comfortable and allows the body part to be placed closer to the film = decreased OID
- found on fluoro tables

Question 4

Disadvantages of a curved X-ray table top

Answer 4

• hard to do oblique or lateral positions, also decubitus and cross-table
• useless for table top radiography

Question 5

Incoming current into the circuit is how many hertz and volts?

Answer 5

60 Hz
200-240 volts

Question 6

Line compensator, what it does and why it’s used

Answer 6

Measures the voltage provided and adjusts it to 220 v
- incoming line (into the circuit) cam vary 5%

Question 7

Single phase will drop to what, what did this mean for X-ray production?

Answer 7

0
No X-rays will be produced when at 0

Question 8

Why is three phase full wave better than single phase unrectified

Answer 8

Because the power stays up since there’s multiple lines of power while single phase drops down to zero

Question 9

Supplies the X-ray tube with modified power and to provide potential difference (kVp)

Answer 9

Main or tube circuit
-purpose is to produce X-rays

Question 10

What supplies the filament with modified power and the purpose?

Answer 10

Filament circuit
- create enough current for thermionic emission

Question 11

Why is the incoming voltage stepped down in the filament circuit

Answer 11

To increase current which is needed for thermionic emission

Question 12

When you set the mA station you are adjusting the number of _____ flowing through the filament circuit which is adjusted by the _____

Answer 12

Amps
Variable resistor/rheostat

Question 13

What is an increase in the mA that results from increased kVp because of the anode being more attractive to the electrons

Answer 13

Space charge

Question 14

The tube/main circuit modifies the incoming power so the radiographer can control what (2)

Answer 14

Voltage and exposure time

Question 15

What has a single winding and supplies voltage to the filament circuit and to the high voltage circuit of the imaging system

Answer 15

Autotransformer

Question 16

What works my electromagnetic self induction

Answer 16

Autotransformer

Question 17

Located across from the output terminals of the Autotransformer and monitors the voltage before the exposure is made

Answer 17

KVp meter

Question 18

Monitors mA and is located at the secondary winding of the high voltage step up transformer

Answer 18

mA meter

Question 19

What does the switch do

Answer 19

Turn power on and off

Question 20

What does the circuit breaker do

Answer 20

Prevents overload (fire)

Question 21

A remote controlled device to allow the flow of electrons through the circuit (begins exposure), activates the rotating of the anode

Answer 21

Exposure switch

Question 22

(T/F) when designing room, the control console must be placed in manner that is impossible for the operator to be exposed

Answer 22

True

Question 23

Monitors the product of mA and time to give the mAs desired

Answer 23

MAs timer

Question 24

Automatically terminates the exposure when a predetermined density has been reached

Answer 24

AEC

Question 25

All of the technologist operate controls are located on the low voltage side of the circuit to minimize what

Answer 25

Hazard of eletrical shock

Question 26

(T/F) the main and secondary circuit combine here to complete the basic circuit

Answer 26

False
Main and filament

Question 27

Control console consists of

Answer 27

Line monitor
Line compensator
Rotor / expo switch
Rheostat
Time selector
Autotransformer

Question 28

Helps you from being electrocuted

Answer 28

Ground

Question 29

Focal spot selector determines what

Answer 29

Which wire will be heated

Question 30

Transformers operate only on what

Answer 30

AC

Question 31

Changes AC to DC

Answer 31

Rectifier

Question 32

Generator power rating

Answer 32

W = V x A
Watts = volts x amps

Question 33

Voltage is stepped down to what in the filament circuit

Answer 33

6-12 volts