Ch. 10 X-ray Imaging
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Compton, photeletric integration, KeV, K-shell, incident photons
- 1.List the five (4) basic x-ray interactions with matter: 3. through the photoelectric effect
- 2.The higher the xray energy the __________________ the wavelength
- A.
Longer
- B.
Shorter
- C.
Higher
- D.
Bigger
- 3.Low-energy x-rays (Thompson) tend to interact with the _____________
- A.
Z#
- B.
High-energy x-rays
- C.
Photoelectrons
- D.
Targer atom
- 4.A change in the direction of the x-ray w/out a change in it's energy is called:
- A.
Coherent scattering
- B.
Photodisintegration
- C.
Compton effect
- 5.X-rays with 5 kev of energy are most likely to undergo _______________ scattering
- A.
Coherent
- B.
Compton
- C.
Backscatter
- D.
Electron
- 6.What produces a uniform density of the radiograph called image noise?
- A.
Image fog
- B.
Filter
- C.
Photidisintegration
- D.
Coherent scattering
- 7.
- A.
Scattered x-ray
- B.
Fluoroscopy
- C.
Compton interaction
- D.
Pair production
- 8.Compton effect: most of the incident photon energy is retained by the___________________
- A.
Photoelectron
- B.
Scattered x-ray
- C.
X-ray
- D.
K-shell
- 9.The formula Ei : E, + (Eu + Ers) represents the_______________
- A.
Photoelectron
- B.
Compton effect
- C.
Thompson
- D.
Pair production
- 10.is responsible for the cassette-hinge sometimes seen on a radiographic image.
- A.
Scattered x-ray
- B.
Image fog
- C.
Image noise
- D.
Backscatter
- 11.After a Compton interaction, the Compton secondary electron drops into a______________- in an electron shell previously created by some other ___________________ event
- A.
Vacancy, ionizing
- B.
Another shell, ionizing
- C.
Outer shell, photoelectric
- D.
L-shell, photoelectric
- 12.The probability that an x-ray will undergo a photoelectricinteractionisapproximately__________times greater in bone than in soft tissue.
- A.
10
- B.
4
- C.
7
- D.
2
- 13.The source of most of the occupational exposure to radiation comes from the_________ during ________________
- A.
Diagnostic x-ray, an exam
- B.
Light, x-ray
- C.
Patient, an exam
- D.
Patient, fluroscopy
- 14.The two types of interaction that are of primary importance due to the levels of energy in diagnostic radiology are____________ and ________________
- 15.The probability of a Compton interaction is _____________of the atomic number of the atom involved.
- A.
Proportional
- B.
Independent
- C.
Inversely proportional
- D.
Depending
- 16.In a Compton interaction, at a deflection of zero (0) degrees from the incident photon,________________ energy is transferred.
- A.
100%
- B.
50%
- C.
0
- D.
35%
- 17.An x-ray undergoes an ionizing interaction with an inner-shell electron and is totally absorbed best describes the --
- A.
Photoelectric effect
- B.
Compton effect
- C.
Butterfly iffect
- D.
Pair production
- 18.During Compton scattering, photon interaction is more likely to occur with ________________ electrons
- A.
Low energy
- B.
Scattered
- C.
High energy
- 19.The formula Er.: Ki- Ku may be used to calculate the energy of the electron emitted during a _________________ interaction
- 20.The type radiation emitted when an electron drops from an outer-shell to an inner-shell is _________________________
- A.
Scattered
- B.
K-shell
- C.
Characteristic
- D.
Photoelectric
- 21.Dwingphotoelectric effect interactions, (electron transition) the vacancy in the last shell is filled by a
- A.
L-shell
- B.
Inner shell
- C.
Outer shell
- D.
Electron
- 22.The probability of photoelectric interaction is _______________proportional to the_________ power of the atomic number of the absorbing material.
- 23.
- A.
Outer shell
- B.
K-shell
- C.
Target atom
- D.
Electron binding energy
- 24.____________ scattering is most likely to reduce contrast in a diagnostic x-ray image
- A.
Coherent
- B.
Covalent
- C.
Compton
- D.
Characteristic
- 25.The ____________________ effect results in the light areas on a radiograph (low optical density), such those corresponding to bone
- A.
Photoelectric
- B.
Image noise
- C.
Compton
- 26.Thequantrty of matter per unit volume, usually specified in units of kilograms per cubic meter (kglttt') best defines___________________
- A.
The photoelectric formula
- B.
Calculation of energy
- C.
Dependence on mass density of matter
- D.
Attenuation law
- 27.Lungs are imaged on a chest radiograph primarily because of differences in
- A.
Mass density
- B.
Image quality
- C.
Image quantity
- D.
X-ray
- 28.The total reduction in the number of x-rays remaining in an x-ray beam after penetration through a given thickness of tissue is called
- A.
Differntial absorption
- B.
Attenuation
- C.
Filtration
- D.
Bone density
- 29.Barium and iodinated compounds are used as an aid for imaging internal organs primarily because of their _________ atomic number and _______________ densities compared with soft tissue
- A.
Low, low
- B.
High, high
- C.
High, high mass
- D.
Mass, high
- 30.Theoretically, based on the attenuation rule, the number of x-rays emerging from any thickness of absorber will never reach 0
- A.
True
- B.
False
- 31.interactions occur with energies greater than approximately 10 MeV
- 32.5% percent of the x-ray incident on a patient actually reach the image receptor.
- A.
True
- B.
False
- 33.Differential absorption increases as the _______________ is increased
- A.
Kev
- B.
Ma
- C.
Kvp
- D.
Contrast
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