Imaging modalities: CT || WITH COMPLETE SOLUTIONS!!
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Imaging modalities: CT
Institution
Imaging Modalities: CT
tomography correct answers ______ is derived from the greek word tomos meaning "slice" and graphien meaning "to write"
axial, sagittal, coronal correct answers CT uses a complex computer and mechanical imaging system to provide sectional anatomy images in the _____, _____, and ______ planes.
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Imaging modalities: CT || WITH COMPLETE
SOLUTIONS!!
tomography correct answers ______ is derived from the greek word tomos meaning "slice"
and graphien meaning "to write"
axial, sagittal, coronal correct answers CT uses a complex computer and mechanical imaging
system to provide sectional anatomy images in the _____, _____, and ______ planes.
x-ray tube and detector array correct answers a CT scanner uses a ____ _____ and ____
_____ to gather anatomic data from a patient.
CAT correct answers _______ scan is not an accurate CT term b/c CT images are routinely
reconstructed in the sagittal and coronal planes as well as in oblique planes.
1970s correct answers since the introduction of clinical CT scanning in the early _____,
systems have evolves through four generations.
detectors correct answers the difference between CT generations is primarily related to the
number and arrangement of _____, the devices that measure the attenuation of the transmitted
x-ray beam
one correct answers first generation scanner use a pencil-thin beam with ____ dector(s).
head correct answers first gen scanners had a 4 1/2 minute exposure time to gather enough
info for one slice from a 180 degree rotation of the tube and detector. these scanners were
capable of _____ CT only.
fan, 30 correct answers second-gen scanners were improved and provided a ____-shaped
beam with ____+ detectors. exposure times were short at about 15 sec per slice or 10 min for
a 40-slice exam.
960 correct answers third-gen scanners included a bank of up to _____ detectors opposite the
x-ray tube that together rotate around the patient in a complete 360 degree cycle to delineate
one slice of tissue
1980s, fixed ring correct answers fourth-gen scanners were developed during the _____.
these scanners possess a ____ ____ of 4800 or more detectors. while the x-ray tube rotates
around the patient in a 360 degree arc, short bursts of radiation are provided by a pulsed,
rotating anode, with 1 min exam times.
360, 360, slip-ring correct answers modern aged ct scanners would rotate ____ degrees in one
direction to obtain one slice, the CT table would advance a set distance and the x-ray tube
would rotate _____ in the opposite direction to obtain the next slice. the development of
______ _____ technology allowed CT to move beyond single-slice acquistion.
high-tension cables, volume scanning, spiral or helical correct answers slip-rings replaced the
______ ______ cables and allowed for continuous rotation of the x-ray tube, which when
combined with patient movement through the gantry acquired data in a helical or spiral
, fashion. the general term to describe this acquisition of a volume of data is ______ ______
aka ______ or _______ scanning
multiplanar reconstruction (MPR), shorter scan times, artifacts reduced (reduced patient
motion) correct answers what are the three advantages of using volume scanning over single-
slice scanning?
four correct answers by late 1998, CT manufactures announced that new multislice
technology scanners were available that were capable of imaging _____ slices simultaneously
per x-ray tube rotation.
320 correct answers at the present time, multislice scanners are available that can image ____
slices per x-ray tube rotation.
acquistion, contrast medium, spatial resolution, quality correct answers advantages over
single slice or volume CT:
- shorter ______ time: a 64-slice system can acquire 160 images per second versus a 1 slice
per second scanner. this decreases the chance for patient motion.
-decreased amount of _____ _______: because of the increased acquisition speed of
multislice scanners.
-improved _____ _____: submillimeter slice thickness is possible as a result of multislice
technology. a decrease in constrast medium is required b/c of the speed.
-improved image ______: b/c of the acquisition of thinner slices.
mobile correct answers ______ CT scanners are available but not commonly used. When
used, they are for trauma or inoperative or backup situations. They are useful in military field
hospitals and for imaging patients on strict isolation.
gantry, computer, operator console correct answers what are the three major components of a
CT system?
x-ray tube, detector array, collimators correct answers the CT gantry consists of what three
main structures?
30 correct answers depending on the CT unit, the gantry typically can be angled ____ degrees
in each direction, as required for imaging of the head or spine.
aperture correct answers the central opening of the gantry is the ______.
gantry correct answers the CT table is electronically linked to the _______ for controlled
movement during the scan.
solid state, cadmium tungstate or rare earth oxide ceramic crystals correct answers detectors
are solid state and are composed for *photodiodes* coupled with scintillation crystal
materials (______ _____ or _____ _____ ____ _____ crystals)
light correct answers solid-state detectors convert transmitted x-ray energy into _____, which
is converted into electrical energy and then into a digital signal. The detector array effects
patient dose and the efficiency of the CT unit.
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