Chapter 5 Quiz

Question 1

Where are xrays produced?

a.) filament
b.) anode target
c.) focusing cup
d.) cathode

Answer 1

b.) anode target

Question 2

When performing an AP foot, the anode heel effect can be utilized by placing the heel under which side of the tube?

a.) cathode
b.) anode

Answer 2

a.) cathode

Question 3

The relationship between anode angle and the anode heel effect is:

a.) direct
b.) indirect

Answer 3

b.) indirect

Question 4

Which anode angle will produce the lowest spatial resolution?

a.) 12 degrees
b.) 6 degrees
c.) 18 degrees
d.) 8 degrees

Answer 4

c.) 18 degrees

Question 5

The area projected onto the anode by the electron stream is called the:

a.) target
b.) actual focal spot
c.) effective focal spot
d.) imaging field

Answer 5

b.) actual focal spot

Question 6

The anode has what type of charge?

a.) positive
b.) negative

Answer 6

a.) positive

Question 7

Which part of the xray tube is responsible for concentrating the electron cloud?

a.) focusing cup
b.) filament
c.) anode angle
d.) focal track

Answer 7

a.) focusing cup

Question 8

What is the most common anode target angle?

Answer 8

12 degrees

Question 9

Heat units can be calculated using the following formula: KVPxMAxSxC

a.) true
b.) false

Answer 9

a.) true

Question 10

What is the atomic numer of tungsten?

Answer 10

74

Question 11

What percent of electrons is converted to heat?

a.) 99.9
b.) 50
c.) less than 1
d.) 10

Answer 11

a.) 99.9

Question 12

The anode heel effect is defined as:

a.) overheating of the anode due to uneven absorption of electrons
b.) a radiographic phenomenon affecting the intensity of the xray beam
c.) the production of xray photons after incident electrons strike a target

Answer 12

b.) a radiographic phenomenon affected the intensty of the xray beam

Question 13

Decreasing the anode target angle: choose all that apply

a.) decreases anode heat dissipation
b.) decreasing spatial resolution
c.) decreases receptor exposure
d.) decreases effective focal spot size

Answer 13

a.) decreases anode heat dissipation
c.) decrease receptor exposure
d.) decreases effective focal spot size

Question 14

which is the purpose of the xray tube housing? choose all that apply

a.) to limit off focus radiation
b.) to create a vaccuum
c.) to cusion the xray tube
d.) as an electrical insulator

Answer 14

a.) to limit off focus radiation
c.) to cushion the xray tube
d.) as an electrical insulator

Question 15

Which of the following is part of the cathode assembly? choose all taht apply.

a.) filament
b.) rotor
c.) target window
d.) focusing cup

Answer 15

a.) filament
d.) focusing cup

Question 16

What is the purpose of the glass or metal envolope? choose all that apply.

a.) to create a vaccuum
b.) to cushion the xray tine
c.) to prevent interaction between the elctron
stream and air electrons
d.) as an electrical insulator

Answer 16

c.) to prevent interaction between the elctron stream and air electrons

Question 17

What term is used to describe the boiling off of electrons at the filament?

a.) electronic emmision
b.) kinetic energy
c.) potential energy
d.) thermionic emission

Answer 17

d.) thermionic emision

Question 18

A small anode angle results in an:

a.) increased heel effect
b.) decreased heel effect

Answer 18

a.) increased heel effect

Question 19

All of the following are associated with the anode except:

a.) thermionic emmision
b.) the line focus principle
c.) the heel effect
d.) the focal track

Answer 19

a.) thermionic emmsision

Question 20

In most xray tubes, there are two filaments to:

a.) ensure saturation current
b.) produce higher energy xrays
c.) provide two electrodes
d.) provide two focal spots

Answer 20

d.) provide two focal spots

Question 21

leakage radiation from an xray tube must not exceed

Answer 21

100mR/hr and 1 meter

Question 22

what is a cathode filament made of

a.) copper
b.) tungsten
c.) nickel
d.) molybdenum

Answer 22

b.) tungsten

Question 23

tungsten has a high melting point of 3400 rpm.

a.) true
b.) false

Answer 23

b.) false

Question 24

the heel effect occurs because of:

a.) a focusing cup
b.) reduced tube current
c.) the shape charge affect
d.) the shape of the filament
e.) xray absorption in the anode

Answer 24

e.) xray absorption in the anode

Question 25

when kvp is applied rotoring there is a potential difference created in the xray tube. exlectrons are then sent from anode to cathode

a.) true
b.) false

Answer 25

b.) false

Question 26

what is the focusing cup made of

a.) copper
b.) tungsten
c.) nickel
d.) molybdenum

Answer 26

c.) nickel

Question 27

which of the following reduces leakage radiation to required standards

a.) xray tube
b.) collimator
c.) added filtration
d.) protective housing

Answer 27

d.) protective housign

Question 28

the xray tube is part of the;

a.) primary xray circuit
b.) secondary xray circuit
c.) filament circuit
d.) breaker circuit

Answer 28

b.) secondary xray circuit