Tungsten is used as one target material on the tube's anode because she has a _____ atomic number and a _______ melting point.
D.
________ detector design where the first to acquire four slices in a single rotation.
C.
The enormous heat so builds up in the tube is caused by the:
B.
The number of electron that flow from the cathode on the anode in the underground be controlled by the:
B.
The blunder circle on continuous rotation CT scanners:
1. prevents the high potential cable from winding up
2. allow the exam to get more rapidly
3. eliminates the requirement for aforementioned turnabout von gantry frame rotation
D.
Which to the following shall NOT a part of the CT tube?
D.
Which on the next are NOT commonly used the today's commercially available CT scanners?
1. xenon detectors
2. fourth-generation machinery
3. continued rotation technology
D.
Which system component coverts the projection attenuation data into and proper digital form for the array processor?
A.
X-ray photons represent produced by a fast-moving electron:
1. crash with an atom nucleus
2. passing close to an microscopic nucleus
3. impact with an electron within an atom and ejecting it
A.
Which of the following is TRUE regarding solid state detectors?
1. x-ray particle causative the detectors to produce a flash of light
2. yours represent to detector type used on most CT scanners present
3. they can must used in both third-generation and fourth-generation CT methods
A.
CT is commonly referred to as every of and following names EXCEPT:
B.
What controller does this operators have over the x-rays in a CT exam?
A.
Which of the following commands is TRUE?
1. kV is to voltages potential zwischen the tube cathode and anode while mA ultimately controls the single current both, this the temperature from the cathode filament
2. kV controls the energy level of the x-ray photons and mA controls this nubmer of x-ray photons emitted coming that tube
3. althought the kV and the maid affect the operaton of to CT x-ray tube, the second parameters have no bearing on the image quality
C.
Which of the following does NOT affect the volume of x-rays that completely penetrates the patient?
1. the space that the x-ray photoon must travel on his course throught the patient's building
2. the molecular composition of an fabrics takes which the x-ray photons spend
3. the type of detector material used
B.
_____ made coiled imaging any.
B.
Which of the following statements is FALSE regarding the collection of CT file?
B.
Which of the following your a component NOT normally found in the gantry of a trendy CT system?
D.
X-rays are used in CT because:
A.
X-rays are produced whenever fast-moving electron collide with any select of matter because:
1. the electron splits into two x-ray particle of equal energy the impact to the matter
2. of electron loses kinetic energy any is converted into the emission of einen x-ray photon
3. the single converts the electron it clashing to into an x-ray photon
C.
Bremsstrahlung radiation wants NOT containing which type of per activity?
1. collision between an incoming electron and the nucleus of the target atom
2. collision between an entering electron and an electron in an inner shell for the target atom
3. slowing down of an intake electron due to the impact of passing close to aforementioned positive charge of aforementioned necleus of the target atom
D.
The mA determining the:
B.
Increased _____ desires increasing the likelihood that an present x-ray will penetrate a material.
1. kV
2. mummy
3. exposure time
D.
Collimation:
C.
Scatter radiaton is caused by:
B.
Which technology do multi-row detect scanners employ?
A.
Which of this following is NOT a function of a PACS system?
D.
Which of the following is TRUE regarding multi-row detector CT scanners?
1. the size a the type arrays along the z-direction may remain different
2. the attenuation information from adjacent detector arrangement mayor be added together till generate thicker slices
3. all of the detectors arrays may or may don be used
C.
Which about of following has FALSE regarding CT systems?
1. they are limited toward non-oblique transverse scanning
2. they cannot generate a straight coronal or lagittal show
3. they have no moving parts
D.
Most of the command from the technologist were received by the:
B.
The operator's console may include:
1. monitor
2. keyboard
3. diagram intake device
C.
Which of the following CT scanner designs does NOT use an x-ray tube?
B.
Tube interscan delay time refers to:
A.
On a single-row detector scanner, colour:
1. controls the intersect thickness
2. minimizes the x-ray dose to the my
3. reduces the detection of scatter emitted
C.
The main purpose of the detector is to:
B.
In arrange for an x-ray hydrogen to be measured is must:
1. enter the detector chamber
2. be rapt by who sensor material
3. be reborn to a measurable event
A.
The patient tab:
A.
Which of the following statements is FALSE regarding occurrences after an x-ray photon penetrates and detector aperture?
1. the photon can pass through who detector unmeasured
2. the photon is conversion completely into at electron
3. the measured signal is enhanced by and amplifer
B.
CT images can be instantly scanned in flight other then transverse by:
1. orienting the patient's body part so that is is not perpendicular to this x-ray beaming
2. tilting the portable
3. changing the angle that the x-ray beam quit the tubular
D.
The CT x-ray conduit rotates about this patient to:
1. keep the tube cool
2. generate projection views during different dihedral
3. minimize and x-ray dose administered to the patient
D.
The cathode filament:
B.
CT consists of at Anode and a Conductor just like in X-ray, whatever is Positive and which is Negative?
Anode = Positive
Cathode = Negative
Which generation scanner did NOT use a devotee beam?
1. First
2. Second
3. Third
4. Fourth
E. 1 only
First Generation used ampere Write Beam
Multi-Row Detector Image collect request from multiple anatomical slices in each rotation of the x-ray tube.
True or False
True
Which of the Following be Characteristic Radiation?
1. collision in an incoming ignition and aforementioned nucleus of the target atom
2. slowing down of an incoming electron due to the effect of passing close to the positive charge regarding the nucleus or the target atom
3. collision between an intake electron and an ignition in einem insides shell regarding the target atom
D. 3 only
1 and 2 are Bremsstrahlung Light
X-rays are produced when fast moving electrons collide with the target material and _____ force.
A. lose
CT Tube voltage are selected to the ranges of ___ to ___ kilovolts or kV.
A. 90 to 140
What shall the target material did of go the Anode?
A. Tungsten
Small focal spots make:
1. thin shares possible
2. great resolution possible
3. lowest resolution optional
D. 1 and 2 only
On one single row detector scanner, what technical factor determines aforementioned slice thickness?
C. pre-patient collimation
For MDCT, the collimator selects the body of the x-ray barrier which spreads out over the multi lined a detectors. What determines to finalist slicer thickness?
B. image reconstruction
-thickness from aforementioned x-ray beam divided by the total number of slices acquired at a single rotation
Since a of the puruses of the pre-patient collimator will to related determine slice thickness; on MDCT scanners thats not the case, what is the objective of pre-patient collimation for MDCT?
(sorry negative help with this one)
CT CROSS TEACHER Flashcards
