Rad Review 50-100 Flashcards
At least how many HVLs are required to reduce the intensity of a beam of monoenergetic photons to less than 10% of its original value?
A. 2
B. 3
C. 4
D. 5
C. 4
Which of the dose–response curves shown in the figure below is representative of radiation-induced skin erythema?
- Dose–response curve A
- Dose–response curve B
- Dose–response curve C
A. 1 only
B. 1 and 2 only
C. 3 only
D. 2 and 3 only
C. 3 only
The principal function of filtration in the x-ray tube is to reduce
A. patient skin dose
B. operator exposure
C. scattered radiation
D. image noise
A. patient skin dose
The reduction in the intensity of an x-ray beam as it passes through material is termed
A. absorption
B. scattering
C. attenuation
D. divergence
C. attenuation
Which of the following radiation situations is potentially the most harmful?
A. A large dose to a specific area all at once
B. A small dose to the whole body over a period of time
C. A large dose to the whole body all at one time
D. A small dose to a specific area over a period of time
C. A large dose to the whole body all at one time
All of the following device(s) can be used to reduce patient dose, except
- grid
- collimator
- gonad shield
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3
EXCEPT
A. 1 only
- grid
Which of the following factors will affect both the quality and the quantity of the primary beam?
- HVL
- kV
- mA
A. 1 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2, and 3
B. 1 and 2 only
- HVL
- kV
The radiographer’s radiation monitor report must include which of the following information?
- Lifetime dose equivalent
- Quarterly dose equivalent
- Inception date
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3
D. 1, 2, and 3
- Lifetime dose equivalent
- Quarterly dose equivalent
- Inception date
The exposure rate to a body 4 ft from a source of radiation is 2.5 mGy/h. What distance from the source would be necessary to decrease the exposure to 1 mGy/hr?
A. 4.6 ft
B. 5.3 ft
C. 6.3 ft
D. 7.2 ft
C. 6.3 ft
All the following function to reduce patient dose except
A. beam restriction
B. high kVp, low mAs factors
C. a high-ratio grid
D. gonadal shielding
EXCEPT
C. a high-ratio grid
The true lateral position of the skull uses which of the following principles?
- Interpupillary line perpendicular to the IR
- MSP perpendicular to the IR
- Infraorbitomeatal line (IOML) parallel to the transverse axis of the IR
A. 1 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2, and 3
C. 1 and 3 only
- Interpupillary line perpendicular to the IR
- Infraorbitomeatal line (IOML) parallel to the transverse axis of the IR
What is the anatomic structure indicated by number 3 in the radiograph in Figure 6–20?
A. Mandibular angle
B. Coronoid process
C. Zygomatic arch
D. Maxillary sinus
B. Coronoid process
All the following statements regarding an exact PA projection of the skull are true except
A. the orbitomeatal line is perpendicular to the IR.
B. the petrous pyramids fill the orbits.
C. the midsagittal plane (MSP) is parallel to the IR.
D. the central ray is perpendicular to the IR and exits at the nasion.
EXCEPT
C. the midsagittal plane (MSP) is parallel to the IR.
Angulation of the central ray may be required
- to avoid superimposition of overlying structures.
- to avoid foreshortening or self-superimposition.
- to project through certain articulations.
A. 1 only
B. 2 only
C. 1 and 3 only
D. 1, 2, and 3
D. 1, 2, and 3
- to avoid superimposition of overlying structures.
- to avoid foreshortening or self-superimposition.
- to project through certain articulations.
The junction of the sagittal and coronal sutures is the
A. diploe
B. lambda
C. bregma
D. pterion
C. bregma
Which of the following skull positions will demonstrate the cranial base, sphenoidal sinuses, atlas, and odontoid process?
A. AP axial
B. Lateral
C. Parietoacanthial
D. Submentovertical (SMV)
D. Submentovertical (SMV)
The focal spot-to-table distance in mobile fluoroscopy must
A. be at least 38 cm
B. not exceed 38 cm
C. not be less than 30 cm
D. not exceed 30 cm
C. not be less than 30 cm
The femoral neck can be located
A. parallel to the femoral shaft.
B. perpendicular to the femoral shaft.
C. perpendicular to a line drawn from the ASIS to the pubic symphysis.
D. perpendicular to a line from the iliac crest to the pubic symphysis.
C. perpendicular to a line drawn from the ASIS to the pubic symphysis.
The reduction in the intensity of an x-ray beam as it passes through material is termed
A. absorption
B. scattering
C. attenuation
D. divergence
C. attenuation
Which of the following techniques is used to evaluate the dynamics of a part?
A. Fluoroscopy
B. Stereoscopy
C. Tomography
D. Phototiming
A. Fluoroscopy