Flashcards in Generating the Radiograph Deck (34):
What determines the degree to which an x-ray passes through tissue?
A tissue's radiodensity.
Will tissues that are ticker in cross-section absorb more less x-ray?
Is the x-ray a positive or negative image?
What is warp?
- What anatomic region?
- What projection?
As an object becomes more radiodense, what will happen to its color on the plain film?
A more dense image will appear more white.
How are joint capsules typically evaluated radiographically?
They are injected with contrast medium, and evaluated to see if they travel outside of the joint capsule.
How will a cylinder look in a radiograph from the side?
Darker sides; whiter center due to density.
What angel is the second in a series of radiographs typically oriented to?
90 degrees to first view to gain 3D representation.
What are the 3 categories of patient positioning terminology in radiographs?
- General body position
- Body part closest to image receptor, or body part patient is lying on
- Special terms
What are some general body position terms?
What are 3 special terms for patient positioning?
- Weight bearing
- Stress x-ray
What is the projection?
Path of x-ray through patient
What projections are required at minimum for long bones?
An AP and lateral projection.
What projections are required at minimum for joints?
How are plain film oriented for viewing?
As though the patient is facing the viewer in the anatomic position, except for hands and feet which are oriented so that the digits face upwards.
What are the 5 patient and exam markers?
- Case number
What are slide markers?
R or L
What does INT mean?
Internal rotation of limb
What does WTB mean?
What does DECUB mean?
What does EXT mean?
External rotation of the limb.
What measure determines the blackness of a radiograph, and what is the unit of measurement?
How can mAs be regulated?
- Current to filament
- Exposure time
What is contrast? What is its unit?
- Shades of gray produced by the peak Kilovoltage (kVp)
What type of contrast does a lower kVp produce?
What type of contrast does a higher kVp produce?
In a high contrast image, is more or less x-ray beam absorbed?
What is a high contrast image useful in identifying?
Sharp cortical edges of bone.
Is more or less x-ray beam absorbed by low contrast images?
More x-ray absorbed.
What is a low contrast image useful for viewing?
What kVp and mAs values produce the best image?
- Highest kVp possible
- Lowest mAs possible
What factors affect the sharpness/ blurriness of an image?
- Distance from the object to the image receptor
What two effects can distortion have on an image?
- Increased distance from the image receptor causes a larger image
- The shape also changes