Quiz 1&2 Flashcards
X-rays are a form of
Electromagnetic radiation
What is the majority of energy produced in the x-ray tube
Heat
The anode consists of
Tungsten Target
Rotating anodes cause an increase intensity of the x-ray beam on the cathode side. This is called
Anode Heel Effect
The cathode provides
electrons
Electron
particle that is negatively charged and travels around the center of an atom
Frequencey
Number of cycles of the wave that pass a stationary point per sec
Wavelength
Distance between 2 consecutive corresponding points on a wave
Why is it important that x-rays are created in a vacuum
prevent dust particles from interfering in production
What does milliamperage (mA) control
- number of electrons boiled off
- number of x-rays produced
- degree of blackness
What does kV control
- penetrating power
- contrast
- shades of gray
Select all the tissues that are particularly susceptible to radiation damage
- skin
- blood
The best place to wear your dosimeter badge is under your lead apron during radiograph procedures.
False
What is the MPD for occupationally exposed people?
5 rem
Where does radiation exposure come from?
x-ray tube head
secondary beam
An overexposed film will be too light.
False
Which is not a physical property of X-rays?
x-rays travel in a wave
The purpose of a grid is to:
absorb scatter and non-image forming x-rays
Order the density of the following tissues from least dense (1) to most dense (5)
- Air
- Fat
- Water/muscle
- Bone
- Metal
As the focal film distance decreases, the intensity of the x-rays increases. This is called
inverse square law
What is the primary influence contrast?
kVp
Foreshortening
when the object in not parallel with the film
Elongation
when beam is at an angle to the object
Magnification
when the object film distance is increased
Distance from x-ray tube to Image detector
SID
Quantity of x-rays
mA
Distance from patient to image detector
SOD
Penetration of x-rays
kVp
Select all the things that affect radiographic detail:
focal film distance
patient movement
The grid is located between the x-ray tube and the patient.
False
Special radiographic procedures are often taken in place of routine survey radiographs.
False
Which is a contraindication of using barium for GI studies?
suspected perforation of GI tract
Fistulography
evaluation of fistulous tracts
Arthrography
evaluation of the joints
Myelograpy
evaluation of the spinal cord
Angiography
evaluation of the heart and surrounding vessels
Which contrast media is used for myelograms?
soluble nonionic iodine
Which is the best procedure for radiographing the abdomen when it has a significant difference in density between it’s thickest and thinnest areas?
take 2 separate exposures according to the difference measurements
Which way should the tube head be directed, if excessive elongation occurs with dental x-rays?
More toward the sensor
What is the goal for dental imaging?
get a complete image of the root
