Exam 1: Take home test Flashcards
X-rays are what type of radiation?
Electromagnetic radiation
T/F: Lead aprons and gloves are designed to allow the shielded body part to be placed in the primary x-ray beam.
False
Lead aprons and gloves typically have ____ mm lead equivalent.
0.5 mm
What charge is the anode?
Positive
What type of charge do electrons have?
Negative
In the x-ray tube, electrons travel toward the ____?
Anode
In the x-ray tube, what % of the energy forms as x-rays?
1%
______ influences the penetrating power of the x-ray?
Kilovoltage
The discovery of the x-ray dates back to?
1895
Describe the purpose of the x-ray tube.
To prevent excess radiation, encloses the cathode & anode, place where x-rays are produced.
Name 3 out of 6 components that every safety program should include:
- PPE
- Technique chart
- Dosimeter badge
T/F: It is acceptable to store lead aprons fold in a cabinet.
False
______ refers to the amount of electrical energy being applied to the filament. Determines the amount of electrons produced.
Milliamperage
T/F: The higher the kVp, the more penetrating power of the beam.
True
T/F: Grids help absorb scatter radiation.
True
Name the two types of safe lights?
Direct and indirect
How does the radiographic appearance of cortical and cancellous bones differ radiographically?
Cortisol is lighter on radiographs, cancellous tends to be darker because of more air.
Example of a long bone?
Femur
Example of a short/cuboidal bone?
Calcaneus
Example of a flat bone?
Skull
Example of irregular bone?
Hyoid bone
Example of a sesamoid bone?
Patella
In regards to the opaqueness of the following objects on a radiograph, rank them in order of MOST opaque to LEAST opaque.
(Bone, gas, fat, metal, soft tissue)
- Metal
- Bone
- Soft tissue
- Fat
- Gas
If a grid is said to have a ratio of 8:1, what does this refer to?
The height of the lead strip compared to the width of the interspace.
What is the name of the person credited with discovering the x-ray?
Wilhelm Conrad Roentgen
The light bulb in the safe light should be _____ watts or less.
15 watts
What is the distance from the target to the film called?
Focal film distance
What influences the speed at which electrons travel from the cathode to the anode?
The kVp. The number of electrons produced in the electron is under the control of mAs by controlling the temperature of the cathode filament.
The difference in density between two areas on a radiograph is referred to as?
Radiographic contrast
When should a grid be used?
With large patients; 9, 10, or 11 cm thick
How does a digital radiograph work compared to using traditional film?
- Instead of having a cassette containing a film and screen, the image is received by an image receptor and is converted to an electrical latent image.
- The image is then transferred to a computer.
- Digital doesn’t have film, traditional does.
_____ is described as the distance between two consecutive points.
Wavelength
The wire filament in the cathode is made of what material?
Tungsten
The area on the target within the anode that the electrons hit is known as _____.
Focal spot
_____ is a term used in the evaluation of radiographs to describe the overall blackness/darkness of a film.
Radiographic density
List 5 tips to minimize excess radiation exposure.
- The PPE
- Dosimeter badge
- Technique charts
- Collimate area to smallest size
- Patient restriant
If a grid is used, will this affect the setting of the radiograph machine?
Yes. Increased exposure is indicated the higher the grid ratio to account for amount of radiation.
If you want to adjust the length of time that it takes for the x-rays to be produced, what control would you adjust?
mAs.
What are the two types of digital radiography and how are they different?
- Direct- converts direct light.
2. Indirect- converts light to digital.
_____ is a type of radiography in which the x-ray tube and film rotate around a fixed point called a fulcrum.
Computer tomography
T/F: When performing an ultrasound, the area on the patient to be examined must be clipped and prepped.
True
Which form of diagnostic imaging produces visual cross-sectional slices?
Computer tomography
T/F: When viewing a fluoroscopy, it is important to note that the display on the screen is the reverse of a regular radiography. (example: bone appears black and lungs appear white)
True
Which form of diagnostic imaging requires the patient to remain in isolation for a minimum of 48 hours after the procedure?
Nuclear scintigraphy
T/F: The waste of animals that have received radioactive isotopes for diagnostic purposed must be isolated for a minimum of 48 hours.
True
Which mode of ultrasound is used in cardiac assessments?
The M mode
Which of the following (CT Scan or MRI) is said to have more diagnostic capabilities for tumors?
MRI
T/F: Direct sunlight can damage dosimeter badges.
True
T/F: Static electricity can result in a film artifact.
True
What is meant by the term “film fogging”? Name one possible cause.
Film fogging appears as an overall foggy appearance in the film causing a decrease in contrast. It usually results from improper storage of the film resulting in damage from ambient light or scatter radiation.
