Study Flash Cards
The threat of bodily harm with the parent ability to do so is termed
Assault
And acute reaction caused by ingestion or injection of a sensitizing agent describes
Anaphylaxis
As the CR laser scanner recognizes the phosphostimulated luminescence released by the PSP storage plate it constructs a graphic representation of pixel value distribution called
Histogram
And accurately position oblique position of the first through fourth lumbar vertebrae will demonstrate the classic Scottie dog. What bony structure does the Scottie dogs neck represent?
Pars interarticularis
In the oblique vertebrae of the lumbar spine the Scottie dogs nose represents
Transverse process
In the oblique vertebrate of the lumbar spine the Scottie dogs eye represents
Pedicle
In the oblique vertebrae of the lumbar spine the Scottie dogs front leg represents
Inferior articular process
In the oblique vertebrae of the lumbar spine the Scottie dogs ear represents
Superior articular process
In the oblique vertebrae of the lumbar spine the Scottie dogs body represents
Lamina
If the SID is increased what is the effect on exposure rate and receptor exposure?
Exposure rate decreases and receptor rate decreases as SID increases
What information must be included on an x-ray image for it to be considered a legitimate legal evidence
name of the facility where examination was performed and examination date
The principal late effects of ionizing radiation on humans include
Genetic effects and malignant disease
What is the standard international unit of radiation exposure?
Gy(a)
What technical factors are used to pose the lease hazard to the particular and allowed?
Large focal spot and high KV
The CR should be directed to the center of the part of greatest interest in order to avoid
Rotation distortion
Federal regulations regarding infection control in the workplace, as amended by the occupational safety and health administration, make which of the following requirements?
Puncture proof containers must be provided for all use needles and follow up care must be provided to any staff asked the only exposed to blood//needle stick
Imperfect expansion of the lungs, often accompanied by dyspnea, is called
Atelectasis
The exposure timer settings on the three-phase radiographic equipment must be tested annually and must be accurate to within
+/-5%
What CR placement will best demonstrate the lumbosacral (L5-S1) articulation an AP position
30 to 35° cephalic CR angle
What projection requires that the shoulder be placed in external rotation
AP humerus
What is well demonstrated in the oblique position of the cervical vertebrae?
Pedicles
What most likely produces a high-quality image?
Large matrix size, high signal to noise ratio, small pixel size, high resolution
How will a decrease in KV affect wavelength, scale of grays, and optical density?
Wavelength will increase, scale of grays will decrease, and optical density will decrease
What term refers to size distortion
Magnification
Advantages of high frequency generators include
Small size, decreased patient dose, and nearly constant potential
Biological material is most sensitive to radiation exposure under which conditions
Oxygenated
The RAO position is used to project the sternum to the left of the thoracic vertebrae in order to take advantage of the
Heart shadow
As window level decreases
Brightness decreases
As window width decreases
Contrast decreases
What does window level control
Brightness
What does window width control
Contrast
What is used to indicate the appropriateness of radiation intensity reaching the IR
Exposure index and sensitivity (S) number
What projection is most useful for bone age evaluation
PA hand
What lies immediately under the phosphor layer of the PSP storage plate
Reflective layer
What is the grid conversion formula
mAs 1/mAs 2=grid factor 1/grid factor 2
Know Grid factor by grid size
No grid= 1 x original mAs
5: 1 = 2 x original mAs
6: 1. = 3 x original mAs
8: 1. = 4 x original mAs
12: 1. = 5 x original mAs
16: 1. = 6 x original mAs
What is the inverse square law formula
I 1/ I 2 = D 2 squared/ D 1 squared
What is the positive end of the X-ray tube
Anode
What is the negative end of the X-ray tube
Cathode
Heat unit formula for single phase
mA x kVp x s
Heat unit formula for three phase
mA x kVp x s x 1.41
What position would best demonstrate the lumbar intervertebral joints and foramina?
Lateral
What term is used to express resolution?
Modulation transfer function (MTF)
A diuretic is used to
Increase urine output
What type of error results in grid cutoff at the periphery of the radiographic image
Off focus
What type of X-ray imaging uses an area bean and photostimulable phosphor as the IR
Computed radiography (CR)
