CT Registry Review (MIC) QUESTIONS AND ANSWERS RATED 100% CORRECT!!
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Course
CT Registry
Institution
CT Registry
In order for an x-ray photon to be measured it must:
1. enter the detector chamber
2. be absorbed by the detector material
3. be converted to a measurable event correct answers 1,2,3
Which system component converts the projection attenuation data into the proper digital form for the array pro...
CT Registry Review (MIC) QUESTIONS AND
ANSWERS RATED 100% CORRECT!!
In order for an x-ray photon to be measured it must:
1. enter the detector chamber
2. be absorbed by the detector material
3. be converted to a measurable event correct answers 1,2,3
Which system component converts the projection attenuation data into the proper digital form
for the array processor? correct answers analog-to-digital converter
Which of the following is NOT a function of a PACS system?
a. reconstruction of the image from the raw data
b. long term data storage
c. digital distribution of images
d. image display for the radiologist correct answers reconstruction of the image from raw data
Which of the following is not part of the CT tube?
a. tungsten target
b. collimator
c. rotating anode
d. filament correct answers collimator
Which of the following is FALSE regarding CT systems?
1. they are limited to nonoblique transverse scanning
2. they cannot generate a straight coronal or sagittal image
3. hey have no moving parts correct answers 1,2,3
Xrays are used in CT because:
a. they are easily produced by the high frequency generator
b. they are less harmful than the heating effects of microwave radiation
c. they penetrate the body according to specific attenuation characteristics of each tissue
d. the FDA imposes no limit on the dose to the patient correct answers C
Most of the commands from the technologists are received by the: correct answers operators
console
Xrays are produced whenever fast moving electrons collide with any form of matter because:
correct answers The electron loses kinetic energy which is converted into the emission of an
x-ray photon
The mA determines the: correct answers quantity of x-ray photons
Which of the following is a component NOT normally located in the gantry of a modern CT
system? correct answers array processor
Tube interscan delay time refers to: correct answers the time between the end of one scan and
the start of the next scan during which the tube will cool
,Increased _______ will increase the likelihood that a given x-ray will penetrate a material
1. kV
2. mA
3. exposure time correct answers 1
Which of the following are NOT commonly used on today's commercially available CT
scanners?
1. xenon detectors
2. fourth-generation technology
3. continous rotation technology correct answers 1,2
Which of the following statements is FALSE regarding occurrences after an x-ray photon
penetrates the detector aperture?
1. the photon can pass through the detector unmeasured
2. the photon is converted completely into a electron
3. the measured signal in enhanced by an amplifier correct answers 2
Scatter radiation is caused by: correct answers deflections from the original trajectory of an x-
ray photon through the patient
What control does the operator have over the x-rays in a CT exam? correct answers the
energy level and the quantity of x-rays can be selected
Which of the following is the standard that's used to achieve compatibility for image transfer
between various imaging modalities, viewing stations, and printers in a hospital? correct
answers DICOM
The enormous heat that builds up in the CT tube is caused by what? correct answers Collision
of the electron beam with the tungsten target on the tube anode
_________________ made helical imaging possible correct answers Continuous rotation
scanners
The patient table:
a. may move continuously during the scan
b. can never be positioned automatically by software due to safety precautions
c. remains stationary through the exam once it is initially positioned
d. only moves after each slice is completed correct answers A
The main purpose of the detector is to: correct answers capture x-ray photons and convert
them to a measurable signal
The cathode filament: correct answers helps determine the size of the focal spot
Which of the statements in TRUE:
1. kV is the voltage potential between the tube cathode and anode while mA ultimately
controls the filament temp of the cathode filament
2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray
photons emitted from the tube
,3. although kV and the mA affect the operation of the CT x-ray tube, the two parameters have
no bearing on the image quality correct answers 1,2
The number of electrons that flow from the cathode to the anode is controlled by the: correct
answers mA
Which of the following is TRUE regarding solid state detectors:
1. x-ray photons cause the detectors to generate a flash of light
2. they are the detector type used on most CT scanners
3. they can be used in both third-generation and fourth-generation CT systems correct
answers 1,2,3
The slip ring on continous rotation CT scanners:
1. prevent the high voltage cable from winding up
2. allows the exam to commence more rapidly
3. eliminates the need for the reversal of gantry frame rotation correct answers 1,2,3
CT is commonly referred to as all of the following except:
1. computerized axial tomography
2. digital subtraction angiography
3. CAT-scan
4. computed tomography correct answers 2
Which of the following CT scanner designs does NOT use an x-ray tube?
1. first generation
2. PET/CT
3. electron beam CT
4. MDCT correct answers 3
__________ allows remote authorized individuals to connect to a server in a secure fashion
using the routing infrastructure provided on a public network, such as the internet. correct
answers VPNs (virtual private networks)
Which technology do multi-row detector scanners employ? correct answers third-generation
Which of the following statements is FALSE regarding the collection of CT data?
1. long scan times are more desirable because they average out motion artifacts
2. reconstruction process used to create the image occurs in the array processor
3. to collect the complete st of CT data, x-rays must be passed through the body at many
different angles
4. the detectors measure the x-rays which completely penetrate the patient correct answers 1
On a single-row detector scanner, collimation:
1. controls the slice thickness
2. minimizes the x-ray dose to the patient
3. reduces the detection of scatter radiation correct answers 1,2,3
In a radiology department, a ________________ is a example of a "client" on the network:
a. CT scanner
b. viewing console in the physicians reading room
, c. printer for diagnostic images correct answers a,b,c
Which of the following is TRUE regarding multi-row detector for CT scanners?
1. size of the detector arrays along the z-direction may be different
2. the attenuation information from adjacent detector arrays may be added together to
generate thicker slices
3. all of the detectors arrays may or may not be used correct answers 1,2,3
The CT x-ray tube rotates around the patient to:
1. keep the tube cool
2. generate projection views at different angles
3. minimize the x-ray dose administered to the patient correct answers 2
Collimation:
1. accomplished by electrically blocking x-rays
2. affects scan time
3. limits low every x-ray photons and passed high energy photons
4. is accomplished by physically blocking x-rays correct answers 4
Tungsten is used as the target material on the tubes anode because it has a _________ atomic
number and a _________ melting point
1. low, high
2. high, low
3. low, low
4. high,high correct answers 4
CT images can be directly scanned in planes other than transverse by:
1. orienting the patient's body part so that it is not perpendicular to the x-ray beam
2. tilting the gantry
3. changing the angle that the x-ray beam leaves the tube correct answers 1,2
Which of the following does NOT affect the quantity of x-rays that completely penetrates the
patient?
1. the distance that the x-ray photons must travel on their course through the body
2. the molecular composition of the tissues through which the x-ray photons pass
3. the type of detector material used correct answers 3
The operators console may include
1. monitor
2. keyboard
3. graphic input device correct answers 1,2,3
___________ is the mathematical process used by single-row detector scanner to reconstruct
CT images from raw data correct answers Filtered back projection
MDCT scanners capable of collecting 64 slices in a single rotation do NOT:
a. perform conventional CT scans
b. perform helical CT scans
c. use filtered back projection as their method of image reconstruction
d. perform localizer scans correct answers C
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