- Created by: Emmatjies
- Created on: 15-01-20 17:23
Soft tissues- Nothing bony
Foreign bodies- A mass or particle of material that is not normal to the place where it is found.
Principles of Foreign body imaging
- Get a good pt history
- Ensure Image receptor is clean and artefact free
- Use radiopaque marker to show entry wound on resultant images
- Take a flexible approach.
Conventional Radiography/ Fluoroscopy
Limited use for imaging soft tissue
Reduce kVp for penetrating foreign body/ies in throat.
Cassette and IR must be clean
Utilise image manipulation as much as possible
Fluoroscopy is 65% sensitive and is usefuk to guide the removal, glass and metal, Not good for wood or plastic.
Very sensitive for soft tissue imaging.
Image manipulation and windowing are excellent
Good visualisation of FB in the orbit
Very high dose
Excellent for soft tissue
Useful to isolate foreign bodies not seen on isolation
Contact is required. Wounds can be a problem
Magnetic Resonance imaging
Excellent for soft tissue imaging
Very disease sensitive
More scan planes to aid detection
Never for metallic foreign bodies
Classification of foreign bodies
Accidental ingestion/ Deliberate ingestion- double condom sign, button vs battery
Inhalation/aspiration- 3 year olds most at risk
FB in the eye
FB inserted into various body cavities.
Coin vs Button battery- 3 year olds are most at risk of ingestion. Button batteries are v dangerous. They can be differentiated by looking for a double rim sign.
Double condom sign - A lucent rim of air trapped between multiple layers of latex, which may be less evident with well machine wrapped packages.
Tic Tac Sign- Multiple oblong uniformly shaped packages
Rosette sign - Air trapped in the knot where the condom is tied
Radiographic density of packages- The density of the ingested packet is variable and is determined by the type of wrapping material used, ranging from densely radio-opaque aluminium to radiolucent wax and the contents of the packet.