QUESTIONS AND ANSWERS GRADED A+
⫸ image stitching Answer: stitching together multiple images - useful
for scoliosis studies of the spine, long bone studies or angiographic
imaging of peripheral vasculature. - to view as a single image.
⫸ image annotation Answer: allow the technologist to inset preset text
or manual text on the image
⫸ contrast resolution (digital) Answer: Ability to distinguish anatomic
structures having similar subject contrast
⫸ spatial resolution Answer: Refers to the amount of detail present in
any image.Phosphor layer thickness and pixel size determines resolution
in CR.
⫸ pixel Answer: A single square within a matrix
⫸ matrix Answer: a series of very small boxes that form a digital image
⫸ direct conversion Answer: one step process in DR where flat panel
detectors convert the x-ray energy directly to an electric signal using an
amorphous selenium detector for immediate viewing
, ⫸ charged coupled device Answer: component which light enters and is
converted into video or electronic signal
⫸ thin film transistor Answer: used to read charges collected during an
exposure
⫸ photodiode Answer: A silicon solid state device sensitive to light.
Converts light into an electrical signal.
⫸ scintillator Answer: Amorphous silicon requires a _____ such as
cesium iodide or a rare earth intensifying screen composed of gadolinum
and lanthanum with oxysulfides. This also converts x-rays to visible
light.
⫸ flat panel detector Answer: a type of digital detector employing
amorphous silicon or selenium detector material, bonded with thin-film
transistor technology for digital image creation and amplification
⫸ density Answer: It is the degree of blackening of a radiograph
resulting from radiation exposure and processing and one of the two
photographic properties that comprise visibility of detail.
⫸ automatic exposure controll Answer: a device that measures the
quantity of radiation that reaches the image receptor and automatically
terminates the exposure when the image receptor has received the
required radiation intensity