Fluoroscopy Flashcards
what is fluoroscopy
this involves acquiring a series of 3D xray images in a period of time
basically an xray video
It allows the dynamic visualisation of the bodys structures and organs in real time using an xray source
where is fluoroscopy used
cardiac procedures
endoscopy
nuero imaging
orthopeadics
what is contrast
contrast is a barium sulphate solution which is ingested by the patient at it allows the structures to be seen
what are the 4 main parts of the image intensifier
photocathode and the input phosphor
output phosphor
anode
foccussing lens
what is the function of the input phosphor
it absorbs any photons that strike it and then they convert this photon energy into visible light
what is the function of the photocathode
the photocathode is attached to the input phosphore and when visiblelight strikes it it them emitts electrons
what is the function of the focussing lens
the function of the focussing lens is to push the photoelectrons towards the focal spot of the beam
what is the function of the accelerating anode
its function is to attract the photoelectrons through its hole which lead to the output phosphor
what is the function of the output phosphor
when the photoelectrons strike the output phosphor they are converted back to light photons with more energy due to the application of a voltage
these light photons are visible to the human eye
what are flat panel detectors
these are xray detectors that are used as a replacement for image intensifiers because:
- they offer less dose
- they offer minimal image distortion
-the images are true to size
what are the two types of flat panel detectors
direct and indirect flat panel detectors
what is the function of a direct flat panel detector
theyb have an outermost layer of high voltage bias electrode and they convert xrays to charge directly
what is the function of indirect flat panel detectors
they have an outrermost layer of phosphor screen and the convert xrays to light then to chartge
