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CT Image Production QUESTIONS AND ANSWERS 100% CORRECT
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CT Image ProductionAn increase of which of the following exposure factors would increase the total number of x-ray photons
exposing the detectors - correct answer ✔✔Increase milliamperage (mA)
Increased kilovoltage peak (kVp)
Increase rotation time
The specific process that accelerates electron in an x-ray tube is - correct answer ✔✔Application of a
voltage
X-ray tubes in CT are most similar to the radiation source used within which modality - correct answer
✔✔Diagnostic radiography
Which of the following statements correctly describes the flow of electrons through an x-ay tube? -
correct answer ✔✔Cathode to anode
What technical change is expected to increase the penetrating ability of an x-ray beam - correct answer
✔✔Increased kilovoltage peak (kVP)
Which of the following effects occur when milliamperage (mA) is increased in CT? - correct answer
✔✔Increased dose of the patient
Increased beam intensity
Increased exposure to the detector elements
Compared to general radiography, CT x-ray tubes require which of the following? - correct answer
✔✔Larger heat capacity
Longer exposure time, more radiation, and higher mA settings
Production of x-rays in a CT machines requires a: - correct answer ✔✔Source of electrons
,Means of rapid acceleration of electrons
Means of rapid deceleration of electrons
If mA is decreased by a factor of 2, how is the radiation does of other patient changed if all other factors
remain unchanged - correct answer ✔✔Dose is decreased by a factor of 2
If the rotation time of a scan is decreased, what other exposure parameter should be changed to
maintain the image quality? - correct answer ✔✔Increase mA
The width of the x-ray beam is controlled by: - correct answer ✔✔Collimation
Increasing the mA and voltage of a CT scan will usually result in which two of the following: - correct
answer ✔✔Increase patient dose
Decrease image noise
The phrase "8-slice scanner" referse to a CT imaging system that has: - correct answer ✔✔8 detector
rows
The principle advantage of thin detector rows is - correct answer ✔✔Higher spatial resolution
A single "view" acquired during a CT scan is also called a - correct answer ✔✔Projection
Which component of the CT imaging system is responsible for creating reconstructed image data? -
correct answer ✔✔Computer system
What are the common voltage settings used in CT? - correct answer ✔✔80, 100, 120, 140 kVp
What is the main difference between production in CT and image production in radiology - correct
answer ✔✔Projections are compiled into a 3D volume of data
Physical components located inside the CT gantry typical includes: - correct answer ✔✔X-ray tube
,High-voltage generator
calculate the total beam width of a CT scan using 32 detector rows, 0.5mm detectors, 100 mA and 140
kVp - correct answer ✔✔16mm
32 rows x (0.5 mm) row = 16mm
The signal produced by a detector is a(n): - correct answer ✔✔-Analog electrical signal
The sequential acquisition mode is described by which of these statements? - correct answer ✔✔The
patient table moves only between x-ray exposures
Statements that accurately describes the orientation of the z-axis in CT imaging - correct answer
✔✔Extends longitudinally through the scanner
Represents data coordinates in terms of superior and inferior
What CT data acquisition mode collects a series of adjacent axial sections - correct answer ✔✔Axial
scanning
What is the primary reason for decreasing the detector thickness for CT angiography examination -
correct answer ✔✔Increased spatial resolution
During an axial scan, the total amount of anatomical coverage per tube rotation is dependent on which
of the following two variables - correct answer ✔✔Number of activated detector rows
Thickness of activated detector rows
helical scanning AKA - correct answer ✔✔spiral scanning
when the pitch is less than one, how do the resulting views comprise the scan data - correct answer
✔✔Overlapping views in the scan data
, A CT detector configuration is changed from 0.625 mm x 16 rows to 1.25 mm x 8 rows. The change may
result in: - correct answer ✔✔Decrease patient dose
decrease spatial resolution
The localizer images are used by the technologist to assign which variable of a CT scan - correct answer
✔✔Display-field-of-view (DFOV)
What portion of the patient can be visualized through the process of retrospective reconstruction -
correct answer ✔✔Only parts of the patient within the scan-field-of-view
Acquisition thickness refers to the - correct answer ✔✔thickness of active detective rows
CTA imaging of the heart is sometimes performed with the CT scanner in the volume acquisition mode.
This means that the: - correct answer ✔✔Scan data is acquired in one rotation of the x-ray tube
Volume scanning is the preferred way to image the heart
What portion of the patient is processed for viewing on the technologist computer monitor: - correct
answer ✔✔Any part of the patient within the display-field-of -view
Which of the following statements regarding the SFOV are true
- The SFOF is larger than the DFOV
- Data in the SFOV is sent to the radiologist
- Data in the SFOV is saved on the CT computer system
- The size of the SFOV is set by the technologist using the scout images - correct answer ✔✔The SFOF is
larger than the DFOV
Data in the SFOV is saved on the CT computer system
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