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DIAGNOSTIC IMAGING FINAL EXAM LATEST UPDATE
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DIAGNOSTIC IMAGING FINAL EXAMLATEST UPDATE
*What is the physical property of X-rays?*
a. Travel along straight lines.
b. Refract and reflect similarly to visible light.
c. Are visible in the dark.
d. Magnets may deflect it - ANSWER A. Travel along straight lines.
x-ray photons travel in a straight line until they interact with something. The
direction of the primary beam is then changed. Photons have no electrical charge
and are unaffected by magnetic or electric fields. They cannot be refracted or
reflected like visible light.
As the wavelength of X-ray photons shortens, so does the energy of the X-ray
beam.
a. Stay the same.
b. Lengthen
c. Decrease
d. Increase - ANSWER D. Increase
As with other types of electromagnetic radiation, the x-ray beam's frequency
increases as the wavelength decreases. The number of cycles passing through a
stationary location every second is used to calculate frequency. The energy and
penetration power increase with frequency.
The kVp setting of an x-ray equipment controls the...
,a. Quality of the x-ray beam.
b. Number of X-ray beams
c. Number of electrons emitted.
d. Focal spot size - ANSWER A. Quality of the x-ray beam.
The kilovoltage peak, or kVp, defines the peak energy of the x-rays, which in turn
influences the penetrating power or beam quality.
The x-ray machine's milliampere-seconds (mAs) setting controls the...
a. Quality of the beam.
b. Number of x-rays emitted
c. Speed of electron emission
d. Wavelength of the beam - ANSWER B. Number of x-rays emitted
Milliampere seconds, or mAs, are the units of electrical energy applied to the
filament per second and the quantity of x-rays produced during exposure.
During an exposure, electrons in the x-ray tube move from...
a. Anode to cathode.
b. Anode to target
c. Cathode to anode.
,d. Cathode to filament - Answer c. Cathode to anode.
The cathode is the source of electrons in the filament, and the kilovoltage directs
the electrons to the anode during exposure.
An x-ray tube converts a large amount of energy into heat in order to produce
x-rays. The ratio of heat created to x-ray generation is commonly thought to be...
a. 1%: 99%
b. 99%: 1%
c. 50%: 50%
d. 75%: 25% - ANSWER B. 99%: 1%
An x-ray tube generates 99 times the amount of heat as actual x-rays. The heat
from the cathode filament contributes to this, as does the electron beam striking the
focus spot on the anode target. Modern x-ray tubes are built to withstand such high
temperatures without harming the tube.
The electron's acceleration and ultimate hitting energy are determined by...
a. Milliampere (mA)
b. Kilovoltage (kVp).
c. Milliamperage-seconds (mA)
d. Exposure time (Time) - b. Kilovoltage (kVp).
, The kilovoltage peak (kVp) indicates the highest speed of electrons passing through
the x-ray tube. This determines the maximum energy of the x-ray photons
produced, as well as their penetration power.
When you hit the "prep" switch on a rotating anode x-ray machine, you are
basically...
a. Determine the acceleration of the electrons
b. Taking the exposure
c. Heating the focus point and spinning the rotating anode.
d. Heating the filament and spinning the revolving anode - ANSWER D. Heat the
filament and spin the revolving anode.
Before the electrons can be boiled off, the filament must be at the suitable
temperature, and the anode must be rotating at the precise speed in order to receive
the electrons and subsequent heat. The focal spot is the area of the target that
receives electrons. The kVp determines the acceleration, and the exposure does not
occur until the exposure button is depressed.
In terms of producing x-rays in the x-ray tube,...
a. The anode serves as a source of electrons.
b. The cathode serves as the target and focus spot.
c. The cathode side of the tube is positively charged, whereas the anode is
negatively charged.
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