The voltage difference between cathode and anode is called:
A) Voltage
B) Current
C) Resistance
D) Potential difference
D) Potential difference
Tungsten is used for the target because:
A) It is cheap
B) It glows
C) High melting point and efficiency
D) It is magnetic
C) High melting point and efficiency
Electrons carry a:
A) Positive charge
B) Negative charge
C) Neutral charge
D) No charge
B) Negative charge
Bremsstrahlung radiation is also called:
A) Braking radiation
B) Characteristic radiation
C) Ionizing radiation
D) Continuous emission
A) Braking radiation
The anode heel effect causes:
A) Variation in intensity across the beam
B) Increased scatter
C) Ghosting
D) Higher binding energy
A) Variation in intensity across the beam
The voltage difference between cathode and anode is called:
A) Resistance
B) Potential difference
C) Current flow
D) Ionization
B) Potential difference
The anode converts electron kinetic energy into:
A) Heat and X-rays
B) Electricity
C) Magnetic fields
D) Current
A) Heat and X-rays
The maximum number of electrons per shell is calculated with:
A) 2n²
B) n²
C) 2n
D) n+1
A) 2n²
To produce characteristic X-rays, incident electron energy must be:
A) Greater than the binding energy
B) Less than the binding energy
C) Equal to the filament current
D) Equal to kVp
A) Greater than the binding energy
Beam quality refers to:
A) Number of photons
B) Ability of photons to penetrate
C) Exposure time
D) Focusing of electrons
B) Ability of photons to penetrate
In the tube, electrons flow from:
A) Anode to Cathode
B) Cathode to Anode
C) Positive to Negative
D) Target to filament
B) Cathode to Anode
About what percent of interactions at the target produce heat?
A) 10%
B) 50%
C) 99%
D) 100%
C) 99%
Electron binding energy is the energy needed to:
A) Accelerate an electron
B) Remove an electron from its shell
C) Create an electron
D) Rotate the anode
B) Remove an electron from its shell
The photon energy in characteristic radiation is equal to:
A) Added binding energies
B) Difference between binding energies
C) Current squared
D) Wavelength
B) Difference between binding energies
Beam quantity refers to:
A) Number of photons
B) Energy of photons
C) Wavelength
D) Binding energy
A) Number of photons
The filament is made of:
A) Copper
B) Tungsten
C) Aluminum
D) Steel
B) Tungsten
High-speed electrons are controlled by:
A) kVp
B) mA
C) Time
D) Filament
A) kVp
Binding energy is greatest in which shell?
A) K shell
B) L shell
C) M shell
D) N shell
A) K shell
The line focus principle reduces the:
A) Effective focal spot size
B) Actual focal spot size
C) Target angle
D) Heat production
A) Effective focal spot size
Increasing kVp will:
A) Increase beam penetrability
B) Decrease beam penetrability
C) Only increase photon number
D) Only increase mA
A) Increase beam penetrability
The process of “boiling off” electrons is called:
A) Ionization
B) Thermionic emission
C) Binding energy release
D) Bremsstrahlung
B) Thermionic emission
Protons carry a:
A) Positive charge
B) Negative charge
C) Neutral charge
D) Double charge
A) Positive charge
Ionization occurs when:
A) An electron is removed from an atom
B) Protons leave the nucleus
C) Neutrons split
D) Binding energy decreases
A) An electron is removed from an atom
A Smaller effective focal spot results in:
A) Better resolution
B) Less resolution
C) More scatter
D) Lower detail
A) Better resolution
mA controls the:
A) Tube current (# of electrons)
B) Electron speed
C) Penetrability
D) Binding energy
A) Tube current (# of electrons)
Exposure time controls:
A) Electron speed
B) Duration x-rays are produced
C) Focal spot size
D) Energy conversion
B) Duration x-rays are produced
Doubling the mA or mAs will:
A) Cut exposure in half
B) Double x-ray quantity
C) Increase penetrability
D) Decrease heat
B) Double x-ray quantity
The atomic number (Z number) equals:
A) Protons + Neutrons
B) Number of protons
C) Number of electrons
D) Binding energy
B) Number of protons
True or False: Binding energy increases the closer an electron is to the nucleus.
True
False
True
Characteristic X-rays are produced when:
A) Inner shell electrons are ionized
B) Outer shell electrons are ejected
C) Anode rotates
D) kVp is decreased
A) Inner shell electrons are ionized
Which interaction is most dependent on the atomic number of the target?
A) Bremsstrahlung
B) Characteristic
C) Scatter
D) Heel effect
B) Characteristic
Which exam would most likely use a small filament?
A) Hand X-ray
B) Abdomen X-ray
C) Chest X-ray
D) Lumbar spine
A) Hand X-ray
To take advantage of the heel effect, the thicker body part should be placed:
A) Under the cathode side
B) Under the anode side
C) Centered in the beam
D) Away from the tube
A) Under the cathode side
A dual focus x-ray tube refers to a tube that contains:
A)Two filaments, two anodes
B)Two filaments, one anode
C)One filament, two anodes
D) One filament, one anode
B)Two filaments, one anode
X-rays carry a negative charge
A) True
B) False
B) False
X-rays are neutral. Electrons carry a negative charge