Correct and Verified Answers | 2025
LATEST UPDATE. 280 Questions and
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CT is commonly referred to as all of the following names EXCEPT
Digital Subtraction angiography
What control does the operator have over the x rays in a CT exam
The energy level and the quantity of x rays can be selected
Which of the following statements is TRUE
kV is the voltage potential between the tube cathode and anode while mA ultimately controls the
filament current and , thus the temperature of the cathode, kV controls the energy level of the x ray
photons and mA controls the number of x ray photons emitted from the tube
Which of the following does Not affect the quantity of x rays that completely penetrates the patient
The type of detector material used
______ made helical imaging possible
Continuous rotation scanners
Which of the following statements is False regarding the collection of CT data
Long scan times are more desirable because they average out motion artifacts
Which of the following is a component NOT normally located in the gantry of a modern CT system
array processor
X rays are used in CT because
they penetrate the body according to specific attenuation characteristics of each tissue
X rays are produced whenever fast moving electrons collide with any form of matter because
The electron loses kinetic energy which is converted into the emission of an x ray photon
Bremsstrahlung radiation does not include which type of electron activity
collision between an incoming electron and an electron in an inner shell of the target atom
Tungsten is used as the target material on the tubes anode because it has a _____ atomic number and a
_______ melting point
,high, high
_____ scanner design was the first to acquire four slices in a single rotation
Multi row detector
The enormous heat the builds up in the CT tube is caused by the
Collision of the electron beam with the tungsten target on the tube anode
The number of electrons that flow from the cathode to the anode in the tube is controlled by the
mA
The slip ring on continous rotation CT scanners
Prevents the high voltage cable from winding up, allows the exam to commence more rapidly,
eliminates the need for the reversal of gantry frame rotation
Which of the following is Not part of the CT tube
collimator
Which of the following are NOt commonly used on todays commercially available CT scanners
xenon detectors, fourth generation technology
Which system component converts the projection attenuation data into the proper digital form for the
array processor
analog to digital converter
X ray photons are produced by a fast moving electron
Colliding with an atomic nucleus, passing close to an atomic nucleus and colliding with an electron in an
atom ejecting it
Which of the following is true regarding solid state detectors
Xray photons cause the detectors to generate a flash of light, they are the detector type used on most
CT scanners today and they can be used in both third generation and fourth generation CT systems
The mA determines the
quantity of x ray photons
Increased ____ will increase the likelihood that a given x-ray will penetrate a material
kV
Collimation
is accomplished by physically blocking x-rays
Scatter radiaiton is caused by
, deflections from the original trajectory of an x ray photon through the patient
Which technology do multirow detectors scanners employ
third generation
Which of the following statements is false regarding the differences between third and fourth
generation scanners
fourth generation scanners are capable of advanced scanning techniques which are impossible on third
generation scanners
Which of the following is true regarding multirow detector CT scanners
The size of the detector arrays along the z direction may be different, the attenuation information from
adjacent detector arrays may be added together to generate thicker slices, all of the detector arrays may
or may not be used
Which of the following is false regarding CT systems
they are limited to non oblique transverse scanning, they cannot generate a straight coronal or sagittal
image, they have no moving parts
Most of the commands from the technologist are received by the ______
system console
The system console may include
Monitor, keyboard, graphic input device.
The patient table ______
may move continuously during the scan
Which of the following statements is false regarding occurrences after an x-ray photon penetrants the
detector aperture
the photon is converted completely into an electron
CT images can be directly scanned in planes other than transverse by:
Orienting the patients body part so that it is not perpendicular to the x-ray beam and tilting the gantry
The Ct xray tube rotates around the poatient
generate projection views at different angles
The cathode filament
helps determine the size of the focal spot
The focal spot size is usually determined by specifying the
slice thickness