Exam (elaborations)
Diagnostic- Computed Tomography questions with verified answers
- Course
- Institution
Diagnostic- Computed Tomography questions with verified answers
[Show more]
Seller
Follow
Content preview
Diagnostic- Computed Tomographyquestions with verified answers.
_____ imaging modality that creates cross sectional images of the body using x-rays ANS - CT
______ credited with the invention of CT ANS - Godfrey Hounsfield
Give the year
1_______ - Godfrey Hounsfield first successful demonstration of CT scans
2________-CT becomes widely available
3________- spiral CT introduced
4________-multislice introduced
5________-company produces scanner fast enough to scan heartbeat (called electronic beam CT) ANS -
1. 1970s
2. 1980s
3. 1990s
4. 2000s
5. 2008
Why are electronic beam CT scanners not used, even though they are the fastest scanners able to image
heartbeats? ANS - exceedingly high rad dose to patient
Categorize CT scanners by generation:
Gen 1: __________
Gen 2: __________
Gen 3:__________
Gen 4:__________ ANS - Gen 1: pencil beam (single detector)
Gen 2: multiple pencil beams (multiple detectors)
, Gen 3: fan beam (with moving detector array)
Gen 4: stationary ring of detectors, tube moves in full revolution (w slip-ring technology)
First CT scanners were dedicated to _______ ANS - head scanners
______-pencil-thin beam of radiation that strikes a single detector ANS - ray
A _______ is composed of a set of rays striking a detector array ANS - projection/view
classifies CT scanners ANS - number of detectors/slices
CT is used for:
(Give examples) ANS - Trauma, Interventional, Nuclear Med (PET scans), and Routine exams
______ is a grid of rows and columns used to gather image data for CT scanners; made up of ______,
aka picture elements ANS - matrix; pixels
3D volume element ANS - voxel
Unlike CR and DR in x-ray, there is not a ________ used in CT to measure exposure ANS - exposure
index
Instead of using an exposure index, CT uses _______ assigned to each pixel ANS - Hounsfield Unit
In CT, _______ are numbers assigned to pixels based on the different attenuation coefficients of
materials; directly proportional to signal strength. It is based on water as a reference ANS - Hounsfield
Units
HUs are based on ______ as a reference, with a HU of _____; chosen because it is widely available in the
body and has a uniform density ANS - water; HU of 0
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 $9.29. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now