Exam (elaborations)
CT Image Production QUESTIONS AND ANSWERS 100% CORRECT
- Module
- Institution
CT Image Production QUESTIONS AND ANSWERS 100% CORRECT
[Show more]
Seller
Follow
Sakayobako30
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Sakayobako30. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £15.75. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76800 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now