Lung Vent Agents Flashcards
method of localization of lung vent agenst
closed compartment of airways and lungs traps inhaled RP so RP used must mix completely with air and stay uniform
2 classes of lung vent
gaseous and aeresol
gaseous material have advantage of
complete and lasting mixing with air
gaseous materials have disadvantage of
difficulty trapping exhaled gases from pt
noble gases are useful why
lack of physiological uptake in body and once inhaled become inert and exhale immediatley
the small amount of gaseous material absorbed in bloodstream is exerted how
first pass through body via blood excreting into airspace
how is Xe133 produced
reactor
xe133 half life
5.3 days
energy of Xe133
low energy gamma (80 kev)
Dose xe133
unit dose of 10-20mCi cal wednesday of week of use
what does the unit dose consist of
2cc glass filled vial of Xenon diluted slightly with CO2 under slight negative pressure
Xe127 is produced hoq
accelerator prodcued
xe127 half life
36.4 days
xe 127 energy
gamma emission of 172 and 203 kev
xe127 is no longer availabel
yes
how is xenon gas collected once patient exhales
closed system that outputs to environement or storage for decay
how are aeresols made
droplets with Tc labeled materials made by bubbling oxygen through radioactive liquid
what is a baffle system
allows droplets of proper size to be carried by oxygen flow to the patient
what happens to the aersol that does not deposit on interior lung surface
it is exhaled and trapped in a filter to prevent contamination of pt or room
optimal droplet size
0.5-3 microns (sm enough for prolonged suspension in the air)
biological half life in lung for aeresol is
45 min
pt inhale material for how long
2-8 minc
main concern with aersol pt
contamination of pt, cam, tech externally
what is kit made of
Tc DTPA
dose of Tc DTPA
30-40 mCi
