Chapter 5 Quiz Flashcards
Where are xrays produced?
a.) filament
b.) anode target
c.) focusing cup
d.) cathode
b.) anode target
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
a.) cathode
The relationship between anode angle and the anode heel effect is:
a.) direct
b.) indirect
b.) indirect
Which anode angle will produce the lowest spatial resolution?
a.) 12 degrees
b.) 6 degrees
c.) 18 degrees
d.) 8 degrees
c.) 18 degrees
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
b.) actual focal spot
The anode has what type of charge?
a.) positive
b.) negative
a.) positive
Which part of the xray tube is responsible for concentrating the electron cloud?
a.) focusing cup
b.) filament
c.) anode angle
d.) focal track
a.) focusing cup
What is the most common anode target angle?
12 degrees
Heat units can be calculated using the following formula: KVPxMAxSxC
a.) true
b.) false
a.) true
What is the atomic numer of tungsten?
74
What percent of electrons is converted to heat?
a.) 99.9
b.) 50
c.) less than 1
d.) 10
a.) 99.9
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
b.) a radiographic phenomenon affected the intensty of the xray beam
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
a.) decreases anode heat dissipation
c.) decrease receptor exposure
d.) decreases effective focal spot size
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
a.) to limit off focus radiation
c.) to cushion the xray tube
d.) as an electrical insulator
Which of the following is part of the cathode assembly? choose all taht apply.
a.) filament
b.) rotor
c.) target window
d.) focusing cup
a.) filament
d.) focusing cup
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
c.) to prevent interaction between the elctron stream and air electrons
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
d.) thermionic emision
A small anode angle results in an:
a.) increased heel effect
b.) decreased heel effect
a.) increased heel effect
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
a.) thermionic emmsision
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
d.) provide two focal spots
leakage radiation from an xray tube must not exceed
100mR/hr and 1 meter
what is a cathode filament made of
a.) copper
b.) tungsten
c.) nickel
d.) molybdenum
b.) tungsten
tungsten has a high melting point of 3400 rpm.
a.) true
b.) false
b.) false
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
e.) xray absorption in the anode
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
b.) false
what is the focusing cup made of
a.) copper
b.) tungsten
c.) nickel
d.) molybdenum
c.) nickel
which of the following reduces leakage radiation to required standards
a.) xray tube
b.) collimator
c.) added filtration
d.) protective housing
d.) protective housign
the xray tube is part of the;
a.) primary xray circuit
b.) secondary xray circuit
c.) filament circuit
d.) breaker circuit
b.) secondary xray circuit
