Exam (elaborations)
CT TEST REVIEW QUESTIONS AND ANSWERS
- Course
- Institution
CT TEST REVIEW QUESTIONS AND ANSWERS
[Show more]
Content preview
CT TEST REVIEW QUESTIONS ANDANSWERS
The main goal (s) in CT is to... - Answer--minimize superimposition
-improve contrast resolution
-provide a large amount of clinical information in a short amount of time
Arrange MR imaging, CT imaging and plain film x-ray imaging in order from best to
worst in their ability to diffeniate soft tissues in the body: - Answer-MRI is better than CT
is better than x-ray
Sectional images are obtained from all of the following except: - Answer-conventional
radiography
Which acronym has been established by the Radiological Society of North America in
major American radiology journals? - Answer-CT
Data acquisition refers to: - Answer-collecting x-ray transmission readings from the
patient
Which term describes the systematic motion of the x-ray tube as it rotates around the
patient to collect x-ray transmission readings? - Answer-scanning
Who developed the first clinically useful computed tomography scanner? - Answer-
Hounsfield
The detectors convert the attenuation data into _______________ signals. - Answer-
electrical
Who is considered the "Father of Computed Tomography"? - Answer-Godfrey
Hounsfield
Please choose all of the answers that apply.
What are the disadvantages of Computed Tomography? - Answer--cost
-high dose of radiation
Please click on all of the answers that apply.
The number of photons that interact with the tissues of the patient depends on the
tissues: - Answer--thickness
-density
-atomic number
The radiation used in Hounsfield's first experiments was: - Answer-gamma
, Computed tomography is able to quantify the beam attenuation of a given structure. The
measurements are expressed in ___________ units. - Answer-Hounsfield
The amount of the x-ray beam that is scattered or absorbed per unit thickness of the
absorber is expressed by the ______________. - Answer-linear attenuation co-efficient
____________________ is the collection of the x-ray transmission measurements from
the patient. - Answer-Data acquisition
In which of the following data acquisition methods are slices taken at a specific location
of the patient? - Answer-conventional slice by slice CT or Sequential CT
Raw data that has been segmented and averaged so that each pixel has an associated
Hounsfield Unit (HU) is ___________ data. - Answer-image
The degree to which the x-ray beam is reduced is a phenomenon referred to as
attenuation. - Answer-true
X-ray photons that pass through objects unimpeded are represented by white area on
the image. - Answer-False
In general, the attenuation co-efficient decreases with increasing photon energy and
increases with increasing atomic number and density. It follows that if the kVp is kept
constant, the linear attenuation co-efficient will be higher for bone that it would be for
lung tissue. - Answer-True
A homogeneous beam is comprised of photons that have different energies. - Answer-
False
Water Hounsfield number - Answer-0 HU
Air hounsfield number - Answer--1000 HU
Bone hounsfield number - Answer-+1000 HU
First Generation Scanner - Answer-Used a pencil beam and a single detector, took 5
minutes to produce an image
Second Generation Scanner - Answer-Used a fan beam and 1-2 detectors, took
approximately 20 seconds to produce an image
Third Generation Scanner - Answer-Used a fan beam and an arc of multiple detectors,
took about 1 second to produce an image
Fourth Generation Scanner - Answer-Used a fan beam and a complete circle of
detectors, took about 1 second to produce an image
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 biggdreamer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now