Exam (elaborations)
CT Questions with correct answers 100%.
- Course
- Institution
CT Questions with correct answers 100%.
[Show more]
Seller
Follow
Content preview
CT Questions with correct answers100%.
The process of modifying pixel values by a mathematical formula is called:
Select one:
a. convolution
b. deconvolution
c. calculus
d. all of the above ANS - a. convolution
TEST QUESTION
To achieve coronal or sagittal sections with computed tomography:
Select one:
a. the gantry is repositioned
b. the patient is repositioned
c. reconfiguration software is implemented
d. none of the above ANS - c. reconfiguration software is implemented
TEST QUESTION
The primary mathematical method used in the creation of computerize medical images is the ______
transformation.
Select one:
a. Pythagorean
b. Bohr
c. Einstein
d. Fourier ANS - d. Fourier
,Because of their simplistic nature, first-generation CT scanners were much smaller than those used
today.
Select one:
True
False ANS - False
If the table is moving at 12 mm/sec., and a section thickness of 10 mm is being acquired, what is the
pitch? Answer to the second digit beyond the decimal point. ANS - 1.20
TEST QUESTION
A CT imaging system produces which type of image?
Select one:
a. Axial
b. Biaxial
c. Fulcrum plane
d. Longitudinal
e. Transverse ANS - a. Axial
Modern pulsed CT scanners operate at:
Select one:
a. 120 kVp
b. 1 to 5 msec pulses
c. up to 1,000 mA
d. all of the above ANS - d. all of the above
A ____ artifact is caused by attenuation of the beam as it passes through the patient.
Select one:
a. beam-hardening
b. ring
,c. star
d. streak ANS - a. beam-hardening
TEST QUESTION
The HU of water is always 1.
Select one:
True
False ANS - False
TEST QUESTION
A _____ artifact is caused by the presence of metal in the patient when performing CT.
Select one:
a. beam-hardening
b. ring
c. star
d. streak ANS - c. star
During CT imaging, beam hardening artifacts:
Select one:
a. Are due to the polyenergetic beam.
b. Can be corrected by preprocessing.
c. Produce CT numbers higher in the periphery.
d. Result in brighter pixels in the center of the patient.
e. Result in higher attenuation in the center of the patient. ANS - a. Are due to the polyenergetic beam.
If the pitch of 0.5 is being used with a section thickness of 10 mm, what is the proper CT table speed?
Answer: ____ mm/sec ANS - 5
TEST QUESTION
, Which of the following is characteristic of a CT image but not of a conventional radiograph?
Select one:
a. Anatomic structures are superimposed.
b. Better contrast resolution is obtained.
c. Better spatial resolution is obtained.
d. More scatter radiation reaches the image receptor.
e. Overlying and underlying tissues are blurred. ANS - b. Better contrast resolution is obtained.
Which of the following statements about multislice CT is true?
Select one:
a. Higher-resolution multislice spiral CT results in low patient radiation dose.
b. Larger detector size results in better spatial resolution.
c. Narrower slice scanning results in better contrast resolution at the same mA.
d. The simplest approach to multislice scanning is the use of eight detector arrays, each of equal width.
e. Wider multislices allow imaging of a greater tissue volume. ANS - e. Wider multislices allow imaging
of a greater tissue volume.
A principal advantage of reconstruction in any z-axis position is:
Select one:
a. Image acquisition during a single breath-hold.
b. Improved contrast resolution.
c. Improved spatial resolution.
d. Larger volume of tissue imaged.
e. Reduction of partial volume. ANS - e. Reduction of partial volume.
During a 360-degree x-ray rotation, the patient couch moves 15 mm during each revolution. Slice
thickness is 10 mm. What is the slice pitch?
Select one:
a. 0.66
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 or Stuvia-credit 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 Professorkaylee. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67163 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now