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RTE 1000 Final Exam (3)
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RTE 1000 Final Exam (3)
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RTE 1000 Final ExamAttentuation - ANS-The process by which a beam of x-ray photons is altered as it
passes through matter
Remnant Radiation - ANS-All radiation exiting the patient during exposure and
ultimately striking the receptor
List 4 Requirements that are needed for an X-ray production - ANS-1. Vacuum 2.
Source of Electrons 3. Target for electrons 4. High Voltage
The component of x ray tube that controls the size and shape of the x ray exposure field
is the is the - ANS-Collimator
ALARA - ANS-As Low As Reasonably Achievable
How does the use of grids affect the contrast in radiograph? - ANS-The use of grids
increase contrast
Grids - ANS-lead strips that absorb 90% scatter radiation (you would need to increase
technique because part of the useful beams get absorbed)
Radiolucent - ANS-materials allow x-ray photons to pass through easily (low radiation)
Radiopaque - ANS-materials that do not permit the passage of x-rays (high radiation)
Kilovoltage peak (kVp) - ANS-Highest voltage of x-ray tube used during an exposure
*CONTROLS QUALITY*
*CONTROLS ENERGY OF THE BEAM*
*CONTROLS CONTRAST*
What happens when kVp is high? - ANS-Scatter=increases
Contrast-decreases
Source-to-image receptor distance (SID) - ANS-x-rays diverge or spread as they exit
the tube
-closer or farther from a source you either
decrease or increase
, the interaction of x-rays with matter than constitutes the greatest hazard to patients in
diagnostic radiography is - ANS-Photoelectric Effect
the unit used to measure the amount of energy absorbed in any medium is -
ANS-Radiation Absorbed Dose (RAD)
-SI unit= gray
The characteristics that determine the sensitivity of a cell to radiation are: - ANS--Age
(younger cells)
-Differentiation (less)
-High Metabolic Rate (more energy)
-High Mitotic Rate (rapidly dividing)
Fluoroscopy - ANS-Real time images
upper/lower GI
kilovoltage determines the __________ of radiation exposure where milliampere
controls its _____________ - ANS-quality; quantity
kilovoltage determines _______________ of radiographic image where milliampere
controls its ________________ - ANS-contrast; density
what are the cardinal principles of radiation protection - ANS-Time, distance and
shielding
As the kVp increases the scatter ________________ - ANS-increases
As the kVp decreases, the contrast ______________ - ANS-increases
C-Arm - ANS-a portable radiography and fluoroscopy
-images patients outside of the department
-operates on battery or plug
T/F Ionization can have biologic effects - ANS-TRUE
ionizing radiation comes from two major sources. What are they? - ANS-1. Natural
background radiation
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