W/L Ch 6 Medical Imaging Quiz Flashcards
Therapeutically, x-rays in the 40 to 300 kVp range are used for which of the following?
a. Treatment of skin cancers and other superficial tumors
b. The planning of a patient’s treatment on the simulator
c. Both of the above
d. None of the above
c. Both of the above
Components of a modern x-ray tube include which of the following?
a. Cathode filament
b. Rotating anode
c. Glass envelope
d. All of the above
d. All of the above
Interactions at the anode that produce x-rays may be described as which of the following?
a. Bremsstrahlung radiation
b. Characteristic radiation
c. Compton scattering
d. All of the above
e. Both a and b
e. Both a and b
X-ray production in the anode occurs by only two methods—Bremsstrahlung and characteristic radiation. Compton scatter, however, is a typical x-ray interaction within the tissues of the human body.
Beam quality is affected by changes in which of the following?
a. kVp
b. Potential difference in the x-ray tube
c. Voltage
d. All of the above
d. All of the above
The quantity of photons in an x-ray beam is directly proportional to _____________.
a. kVp
b. anode temperature rating
c. tube current
d. filtration
c. tube current
Attenuation is the process by which an x-ray beam ___________________.
a. is focused
b. is reduced in intensity
c. diverges
d. exposes a film
b. is reduced in intensity
Which of the following describes the predominant x-ray interaction in the diagnostic range?
a. Compton scatter
b. Photoelectric absorption
c. Coherent scatter
d. None of the above
a. Compton scatter
Additive pathologies affect tissue density such that the affected anatomy may appear _________ on the radiograph.
a. lighter than normal
b. darker than normal
c. unchanged
d. hypoechoic
a. lighter than normal
Destructive pathologies include which of the following?
a. Pleural effusion
b. Atelectasis
c. Edema
d. Necrosis
d. Necrosis
Which technical factor has the most effect on radiographic density?
a. mAs
b. kVp
c. Distance
d. All of the above
d. All of the above
A quality radiograph taken at 100 cm using 20 mAs could be replicated at 50 cm using which of the following?
a. 15 mAs
b. 10 mAs
c. 7 mAs
d. 5 mAs
d. 5 mAs
Inv Sq Law
Unlike digital radiography, conventional imaging media includes which of the following?
a. Film
b. Screens
c. Cassettes
d. All of the above
d. All of the above
Which of the following is responsible for transforming invisible x-rays into energy and then into visible light?
a. Grids
b. Glass envelope
c. Densitometer
d. Intensifying screens
d. Intensifying screens
Which of the following is an advantage of the photostimulatable phosphor plate over conventional x-ray image production?
a. Less radiating per exposure
b. Postprocessing manipulation of density and contrast
c. No need for radiographic grids
d. Higher spatial resolution
b. Postprocessing manipulation of density and contrast
Which of the following imaging receptors do not use light in capturing the latent image?
a. Flat panel detectors (FPDs)
b. TFTs
c. Film and screen
a. Flat panel detectors (FPDs)
Which of the following may be used to reduce the amount of scatter radiation that reaches the image receptor?
a. Collimation
b. Grids
c. Filtration
d. All of the above
e. Both a and b
e. Both a and b
Image fusion as used in the production of positron emission tomography (PET) images may fuse together the PET images with the images of what other imaging modality?
a. Ultrasound
b. X-ray
c. Computed tomography (CT)
d. All of the above
c. Computed tomography (CT)
Three-dimensional imaging using voxels is present in ____________.
a. MRI
b. CT
c. both of the above
d. neither of the above
c. both of the above
In which of the following imaging procedures does an x-ray tube rotate rapidly around the patient?
a. CT
b. MRI
c. Fluoroscopy
d. Mammography
a. CT
Which of the following modalities does not use radiation in image production and acquisition?
a. CT
b. Nuclear medicine
c. MRI
d. Mammography
c. MRI
Because of the mobility of the prostate, which imaging modality is often used at the time of treatment to identify the position of the prostate?
a. Fluoroscopy
b. Ultrasound
c. MRI
d. Nuclear medicine
b. Ultrasound
Who is the discovery of x-rays in 1895 credited to?
a. Wilhelm Conrad Roentgen
b. Theodor Boveri
c. Marie Curie
d. Sir Godfrey Hounsfield
a. Wilhelm Conrad Roentgen
The emission of liberated electrons is the primary purpose of which of the following?
a. Anode
b. Cathode
c. Target
d. Generator
b. Cathode
