Physics - Chapter 6

Question 1

What kvp do imaging systems usually operate between?

Answer 1

25-150 kvp

Question 2

What is the tube current in an imaging system?

Answer 2

100-1200mA

Question 3

What shape is an xray couch/table?

Answer 3

Flat or curved

Question 4

How far can a fluoroscopy table tilt toward the feet?

Answer 4

90 degrees

Question 5

How far can a fluoroscopy table tilt toward the head?

Answer 5

30 degrees

Question 6

What is a common material for an xray table to be made of?

Answer 6

Carbon Fiber

Question 7

What are the 3 principle part of an xray imaging system?

Answer 7

Xray tube
Operating console
High voltage generator

Question 8

What does Theo operating console allow technologists to control?

Answer 8

Xray tube current and voltage

Question 9

What is xray quantity?

Answer 9

Intensity (mAs)

Question 10

What is xray quality?

Answer 10

Penetrability (kvp)

Question 11

How many volts are xray imaging systems designed to operate at?

Answer 11

220V
Some can operate at 110V or 440V

Question 12

What percent can the voltage vary by in a hospital? Why?

Answer 12

Up to 5%
Electric power companies are not capable of providing 220V accurately and continuously

Question 13

What part of the operating console measure the voltage provided to the xray imaging system and adjusts that voltage precisely to 220V?

Answer 13

Line compensator

Question 14

Has only one winding and one core

Answer 14

Autotransformer

Question 15

Designed to supply a precise voltage to the filament circuit and to the high voltage circuit of the xray imaging system

Answer 15

Autotransformer

Question 16

T/F
The primary voltage and the secondary voltage in an Autotransformer are directly related to the number of turns of the transformer enclosed by the respective connections

Answer 16

True

Question 17

What does the major kvp selector do?

Answer 17

Gives a broad selection of kvp technique

Question 18

What does the minor kvp selector do?

Answer 18

Fine tunes the selected technique

Question 19

What is the filament current measured in?

Answer 19

Amperes (A)

Question 20

What current do filaments usually operate at?

Answer 20

3-6A

Question 21

Tube current

Answer 21

mA

Question 22

Tube voltage

Answer 22

kV

Question 23

Line compensation

Answer 23

kV

Question 24

Lower the voltage for safer use and manipulation

Answer 24

Autotransformer

Question 25

What is the full name for a filament transformer?

Answer 25

Filament heating isolation step-down transformer

Question 26

What does the filament transformer step the voltage to?

Answer 26

Approx. 12V

Question 27

What is the current and voltage in the primary windings of a filament transformer?

Answer 27

0.5A - 1A
150V

Question 28

What is the current and voltage in the secondary windings of a filament transformer?

Answer 28

5A - 8A
12V

Question 29

What are the most accurate type of timer?

Answer 29

Electronic

Question 30

Uses synchronous motor as timing mechanism
Minimum exposure time = 17 ms

Answer 30

Synchronous

Question 31

Monitors the product of mA and time
Terminates exposure when specific mAs is obtained

Answer 31

Milliampere-second timer

Question 32

Measures quantity of radiation that reaches the IR
Exposure automatically terminates when required intensity has reached IR

Answer 32

AEC

Question 33

What are the 3 parts of a high voltage generator?

Answer 33

High voltage transformer
Filament transformer
Rectifiers