Floroscopic images Flashcards
what moving images can we use for floro images
blood flow
fitting stents
bowel imaging
how are images produced
same way as xrays
In the process of fluorescence, phosphors absorb high-energy X-ray photons and emit short bursts of visible light
purpose of flouro
widely used in radiography to produce images of moving structures which can be used for real-time diagnostic imaging and treatment guidance
what is fluoro used for
- Evaluation of various parts of GI tract such as oesophagus, stomach, small intestine and large intestine.
- Detection of certain GI tract cancers
what contrast medium is used for contrast imaging
•These examinations use barium sulphate as contrast media
what is the bakclighting system
erarses charge from previous frame to prevent ghosting
characteristics of ideal contrast medium
improves contrast appropriately
demonstrates requirede anatomy or function
is physiologically inert
- non-toxic
- can be excreted
- does not otherwise damage or alter organ
barium sulphate
administered - orally or by enema
solely used in GI tract
used to coat the wall or hollow GI tract
barium enema negative
increase xrays penetrating through tissue
organs become radiolucent
barium enema positive
absorbs radiation so no penetration through the tissue
organ becomes radioplque
barium sulphate
contraindictions
perforations of GI tract
proximal to an obstructed bowel
- barium can cause chemical peritonitis if it escapes into the abdominal cavitiy
micturing cystogram
fill bladder with contrast take images while someone urinates particularly donw in children malformation of urethra and bladder joining - causes some backflow towards kidneys - leads to kidneys infections
Analogue fluoroscopy- Image Intensifier field of view is how big?
40cm
Which one of the following claims for Flat Panel Detectors being better than traditional Image Intensifiers is NOT true?
A.Images lack geometric distortion
B.Compact structure allows greater flexibility of movement
C.They are cheaper than traditional image intensifiers
D.They may reduce patient radiation dose by 50%
C.They are cheaper than traditional image intensifiers
2 benefits of digital fluroscopy
Smaller imaging chain > more flexible movement during fluoroscopy
Fewer artefacts/image problems
No TV system required
Reduced image noise
