Introduction Flashcards
(16 cards)
What are some uses of imaging
Diagnosis
Planning treatment
Guiding treatment
What are x Rays
X Rays are forms of electromag radiation
Packets of energy photons in a beam
What can overexposure to x rays to
Hair loss
Redness
Numbness
Severe pain
What does ionising radiation increase the risk of
Developing malignancy
What are x Ray properties
Undetectable by human sense - hear, see, touch, taste, smell
Travel in straight lines
Interact with matter
How is the production of an x Ray image
X ray photons pass form tube to patent and through to the film
Num photons reaching dim depo on tissue
What can happen to photons as they pass through the pt
Pass through unaltered
Change direction - scatter
Stopped, energy deposed in tissue
What are soft tissues like in x rays
Not good at abs photons
Use contrast material to distinguish structures
What is angiography
Inject a radio graphic dye to bloodstream which outlines the blood vessels
Are xrays 3d
No provide a 2 d image of a 3 d subject
In terms of tooth x ray what can show disease
A loss of mineral which leads to a darker area on the image
What is a ct scan
Computer tomography
Uses x rays but pt in scanner and x ray tube rotates
High dose of radiation
Multi planar
What is an Mri scan
Magnetic resonance imaging
Sting magnet
Good multi planar images
No radiation
What is ultrasound
uses sound waves Sound waves travel at diff speeds in diff tissues Reflect at boundaries between tissues Good for soft tissues No radiation
What is radio- isotope scanning
Inject isotopes ehci are unstable and decay emitting radioactive particles or radiation
Radioactivity detected by special gamma camera
What are some means of imaging
X Rays - radiographs or CT
MRI
Ultrasound
Nuclear Isotopes
