Exam (elaborations)
Chapter 28 Computed Tomography questions with correct answers 100%.
- Course
- Institution
Chapter 28 Computed Tomography questions with correct answers 100%.
[Show more]
Seller
Follow
Content preview
Chapter 28 Computed Tomographyquestions with correct answers 100%.
Helical ANS - ____ CT provides improved imaging of anatomy compromised by respiratory motion
chest
abdomen
pelvis ANS - what body parts is helical CT best for
Godfrey Hounsfield ANS - Who was the first to incorporate digital imaging with the CT scanner?
CT ANS - no other development in medical imaging over the past 50 years has been as significant as
_____
compton ANS - when the abdomen is imaged with conventional radiographic techniques, the image is
created directly on the IR and is low in contrast, principally because of _____ scatter radiation
neprotomography ANS - in _____ the renal outline is distinct because the overlying and underlying
tissues are blurred
tomosynthesis ANS - the latest advance in digital radiography is digital radiographic ____
axial tomography ANS - conventional tomography is called _____ because the plane of the image is
parallel to the long axis of the body; resulting in sagittal and coronal images
transverse ANS - a CT image is a transaxial or _____ image that is perpendicular to the long axis of the
body.
synchronously ANS - the X-ray source and the detector move ____ for CT
,translation ANS - when the source detector assembly makes one sweep, it is called ____
12 ANS - the detector signal during each translation has a dynamic range of ___ bits
5 minutes to complete image ANS - major drawback to first generation imaging system
first ANS - ____ generation imaging system: translate and rotate, pencil beam, single detector, 5 minute
imaging time
increased radiation intensity that occurs toward the edges of the beam because of body shape ANS -
major disadvantage of the fan beam in 2nd generation imaging system
speed ANS - what is the principal advantage of the second generation CT imaging system
second ANS - ____ generation imaging system: translate and rotate, fan beam, detector array, 30
second imaging time
examination time ANS - what is the principal limitation of 2nd generation CT imaging systems
occasional appearance of ring artifacts ANS - principal disadvantage of third generation CT imaging
system
third ANS - ____ generation imaging system: rotate and rotate, fan beam, detector array, sub second
imaging time
fourth ANS - ____ generation CT imaging system: rotate and stationary, fan beam, detector array, sub
second imaging time
third ANS - today essentially all CT imaging systems are ____ generation and have evolved into helical
and multislice imaging
,interpolation ANS - reconstruction of an image at any z axis position is possible because of a
mathematical process called ____
interpolation ANS - if one wishes to estimate a value between known values, it is ____
extrapolation ANS - if one wishes to estimate a value beyond the range of known values, it is ____
180 ANS - linear interpolation at ____ degrees improves z axis resolution
pitch = couch movement each 360 degrees / beam width ANS - equation for helical pitch ratio
ratio ANS - pitch is expressed as a ____
2:1 ANS - a pitch of ____ results in extended imaging and reduced patient radiation dose
1:1 ANS - increasing pitch to above ____ increases the volume of tissue that can be imaged at a given
time
ability to image larger volume of tissue in a single breath hold ANS - what is one advantage of multislice
helical CT
beam width x pitch x imaging time ANS - tissue imaged = _____
1.0 ANS - in practice, the patch for multislice helical CT is usually ____
1.0 :1 ANS - CT angiography requires a pitch of less than _____
operating console
generator
, xray tube ANS - what are the three major subsystems of conventional X-ray imaging system
operating console
computer
gantry ANS - what are the three major components of a CT imaging system
second ANS - the ____ monitor allows the operator to view images before transferring them to the
radiologist's viewing console
3 ANS - how many consoles can CT imaging systems be equipped with
120 ANS - operation is usually approximately ___ kVp, although some recent work supports reducing
patient dose by using a lower kVp
400 ANS - what is the maximum mA used
.5-5 ANS - nominal tissue thickness are ____ to ____mm
reconstruction time ANS - what do the microprocessor and the primary memory determine in CT
reconstruction time ANS - _____ is the time from the end of imaging to appearance of the image
array processor ANS - many CT imaging systems use an _____ instead of a microprocessor for image
reconstruction
xray tube
detector array
high voltage generator
patient support couch
mechanical support for each ANS - what 5 things make up the gantry
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 $24.49. 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
