Radiologic Techniques Flashcards
How many xrays would it take for someone to be exposed to the same amount of radiation received from the environment in one year?
38
A form of energy transmitted through space or matter (very high long wavelengths 10^-10)
X-rays
What is the difference between soft and hard xrays in terms of wavelength?
Soft x-rays are longer and hard x-rays are shorter
The type of x-rays that treat superficial malignancies of the eye and skin
Soft x-rays
The type of x-rays used in general diagnostic radiography
Hard x-rays
Radiographs made without modification by software
Plain-film radiograph
Radiograph viewed on traditional film
Hard copy
Digital recreation of radiograph viewed on a monitor
Soft copy
If an object has high density (such as metal) then…
it has low radiodensity resulting in white areas of film
Variation of radiograph that uses x-rays to obtain real-time moving images of the internal structures of a patient
Fluoroscopy
A series of images, often radiographs, of a joint after injection of a contrast agent
Arthrography
Allow visualization of structures that are not radiopaque
Function of contrast agents
What are the disadvantages of contrast agents?
They are invasive and may cause allergic reactions
An x-ray study of the spinal cord after injection of air or a radiopaque substance into the subarachnoid space
Myelogram
Imaging study of blood vessel usually after injection of contrast agent
Angiogram
Computed tomography merges…
x-ray technology with computer
What occurs at the beginning of the scanning process in CT scans?
A scout image is taken
In CT scans, radiodensity is measured in…
Hounsfield units
What is the scale of hounsfield units?
-1000 HU to +1000 HU
How are hounsfield units useful?
They can be used to aid in the identification of tumors and other structures
