RADT 1200 CHAPTER 3 AND 4 EXAM
Q’S AND A’S
Direct transmission means that x-ray photons: - Answer- pass through biologic
tissue without interaction
Before interacting with matter, an incoming x-ray photon may be referred to as which
of the following? - Answer- primary photon
Noninteracting and small-angle scattered photons comprise - Answer- exit, or
image formation, radiation
Small angle scatter: - Answer- degrade the appearance of a completed
radiographic image by blurring the sharp outlines of dense structures
The target in the x-ray tube is also known as the cathode - Answer- False
For each radiographic procedure, an optimal kVp and mAs combination exists that
minimizes the dose to the patient and procedures an acceptable radiographic image.
- Answer- True
When a technical exposure factor of 100 kVp is selected, which of the following
occurs? - Answer- The beam will will contain photons having energies of 100 keV
or less, with an average effective energy of approximately 33 keV
Which of the following terms are synonymous?
1. coherent scattering
2. classical scattering
3. unmodified scattering - Answer- 1 and 2 only
Which of the following are radiographic image receptors?
1. radiographic grid
2. digital radiography receptor
3. phosphor plate
4. radiographic film - Answer- 2, 3, and 4 only
The optimal x-ray image is formed when only indirect transmission photons reach
the image receptor - Answer- False
Coherent scattering does not contribute noticeably to radiographic fog in
mammography because, during this imaging procedure, breast tissue is gently but
firmly compressed. - Answer- True
, The atomic number of Tungsten is - Answer- 74
Annihilation radiation is used in imaging modality employed in nuclear medicine
called positron emission tomography (PET) - Answer- True
A photoelectron usually is absorbed within a few micrometers of the medium through
which it travels, thereby increasing patient dose and contributing to biologic damage
in tissue. - Answer- True
The radiographer also benefits when patient dose is minimal because less radiation
is scattered from the patient. - Answer- True
A compton scattered electron - Answer- is absorbed within a few microns of the
site of the original compton interaction
annihilates another electron
A compton scattered electron is also known as as Auger electron - Answer- False
Absorption properties of different body structures must be identical to make
diagnostically useful images possible - Answer- False
Primary radiation is synonymous with - Answer- Direct radiation
Of the following interactions between x-radiation and matter, which only occur above
the range of diagnostic radiology?
1. photoelectric absorption
2. pair production
3. photodisintegration - Answer- 2 and 3 only
kVp controls: - Answer- Quality, or penetrating power, of the x-ray photons in the
beam
absorption characteristics of the body part being radiographed
fluorescent yield
A photoelectron may interact with other atoms, but it cannot cause excitation or
ionization of those atoms - Answer- False
A technical exposure factor of 100 kVp means that the electrons bombarding the
target of the x-ray tube have a maximum energy of - Answer- 100,000 eV or 100
keV
Attenuation is any process that increases the intensity of the primary photon beam
directed toward a destination such as the radiographic image receptor - Answer-
False
Q’S AND A’S
Direct transmission means that x-ray photons: - Answer- pass through biologic
tissue without interaction
Before interacting with matter, an incoming x-ray photon may be referred to as which
of the following? - Answer- primary photon
Noninteracting and small-angle scattered photons comprise - Answer- exit, or
image formation, radiation
Small angle scatter: - Answer- degrade the appearance of a completed
radiographic image by blurring the sharp outlines of dense structures
The target in the x-ray tube is also known as the cathode - Answer- False
For each radiographic procedure, an optimal kVp and mAs combination exists that
minimizes the dose to the patient and procedures an acceptable radiographic image.
- Answer- True
When a technical exposure factor of 100 kVp is selected, which of the following
occurs? - Answer- The beam will will contain photons having energies of 100 keV
or less, with an average effective energy of approximately 33 keV
Which of the following terms are synonymous?
1. coherent scattering
2. classical scattering
3. unmodified scattering - Answer- 1 and 2 only
Which of the following are radiographic image receptors?
1. radiographic grid
2. digital radiography receptor
3. phosphor plate
4. radiographic film - Answer- 2, 3, and 4 only
The optimal x-ray image is formed when only indirect transmission photons reach
the image receptor - Answer- False
Coherent scattering does not contribute noticeably to radiographic fog in
mammography because, during this imaging procedure, breast tissue is gently but
firmly compressed. - Answer- True
, The atomic number of Tungsten is - Answer- 74
Annihilation radiation is used in imaging modality employed in nuclear medicine
called positron emission tomography (PET) - Answer- True
A photoelectron usually is absorbed within a few micrometers of the medium through
which it travels, thereby increasing patient dose and contributing to biologic damage
in tissue. - Answer- True
The radiographer also benefits when patient dose is minimal because less radiation
is scattered from the patient. - Answer- True
A compton scattered electron - Answer- is absorbed within a few microns of the
site of the original compton interaction
annihilates another electron
A compton scattered electron is also known as as Auger electron - Answer- False
Absorption properties of different body structures must be identical to make
diagnostically useful images possible - Answer- False
Primary radiation is synonymous with - Answer- Direct radiation
Of the following interactions between x-radiation and matter, which only occur above
the range of diagnostic radiology?
1. photoelectric absorption
2. pair production
3. photodisintegration - Answer- 2 and 3 only
kVp controls: - Answer- Quality, or penetrating power, of the x-ray photons in the
beam
absorption characteristics of the body part being radiographed
fluorescent yield
A photoelectron may interact with other atoms, but it cannot cause excitation or
ionization of those atoms - Answer- False
A technical exposure factor of 100 kVp means that the electrons bombarding the
target of the x-ray tube have a maximum energy of - Answer- 100,000 eV or 100
keV
Attenuation is any process that increases the intensity of the primary photon beam
directed toward a destination such as the radiographic image receptor - Answer-
False
