test part 2 Flashcards
(25 cards)
when was the first fluoroscope available
1896
image intensified fluoro ma
0.5-5
expression of the ability of an image intensifier tube to convert x ray energy into light energy and increase the brightness of the image in the process
brightness gain
reduction in the size of output phosphor compared with that of the input phosphor
minification gain
expressed as the ratio of number of light photons at output phosphor to the number of light photons emoted in the input phosphor
flux gain
brightness gain =
minification x flux gain
flux gain =
number of output photons
divided by
number of input photons
minification gain=
input diameter squared
divided by
output diameter squared
when in mag mode the voltage to the lenses is
increased
loss of brightness around the periphery of the image
vignetting
unequal magnification
pincushion appearance
II fluoro mas
2-5
the shutters should restrict the beam to the size of the input phosphate and be accurate within
+/-3
two types of view systems
camera tube and ccd
what does the camera tube enclose
electron gun and photoconductive target assemble
thin enough to transmit light traveling through the face plate from the II but thick enough to conduct electricity
signal layer
will conduct electricity if illuminated but will otherwise stay as just an insulator
target layer
thinned segment of the glass envelope positioned closest to the output phosphor of the II and allows transition of light from the II
Light sensitive semi conducting device that generates an electrical charge when stimulated by light and stores charge in a capacitor
CCD
each capacitor in CCD represents what
a pixel
electrodes between each pixel
row gates
electrons are dislodged when hit by light
the row gates become charged and the charge goes down the row and is transferred to capacitors
CCD
The camera tube or CCD may be coupled to the output, phosphor of the image intensifier by either a
fiber optic bundle or optical lenses system
can u do spit filming with ccd
no
