Exam (elaborations)
CT REGISTRY EQUATIONS & QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
- Course
- Institution
CT REGISTRY EQUATIONS & QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
[Show more]
Content preview
CT REGISTRY EQUATIONS &QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
To determine how many pixels are being used? - ANSWER 1. Multiply # of rows x the # of columns in the
matrix
2. Divide the field of view by the matrix size; Make sure you are using the same units for both.
To determine the number of slices needed? - ANSWER Divide the coverage area by the slice thickness.
Pt dose is equal to? - ANSWER mA aka tube current x Rotation time
The number of samples of attenuation profiles present in the raw data is determined by? - ANSWER
Multiplying the number of detectors by the # of projections
Usual full rotation is? - ANSWER 360 degrees
To determine how many projections were obtained per degree? - ANSWER Divide the number of
projections by 360 degrees.
3 ways to compensate for increased noise associated with thin slices? - ANSWER 1. Increase
reconstruction field of view
2. Decrease matrix size
3. Increase mA
Spatial Resolution depends on? - ANSWER Reconstruction Field of View-the smaller the field of view the
greater the resolution
Image Matrix- Greater the matrix size the greater the resolution
Decrease in FOV does what to pixel size? - ANSWER Decreases it.
, Increase in matrix size does what to pixel size? - ANSWER Decreases pixel and voxel size.
To determine the pitch on a single row detector? - ANSWER Divide the movement of the table by the
slice thickness
To determine the pitch on a multi row detector? - ANSWER Divide the movement of the table by the
total slice volume or the thickness of a single slice
Name the 5 imaging parameters? - ANSWER 1. Contrast Resolution
2. Spatial Resolution
3. Temporal Resolution
4. Noise
5. Patient dose
Typical slice thickness for a CT of the HEAD? - ANSWER 5-10 mm
CT findings are described as? - ANSWER Isodense, hypodense, and hyperdense
What is considered the reference density - ANSWER Brain
The more dense a structure is .... - ANSWER The brighter it appears such as skull=white
The less dense a structure is ... - ANSWER The darker the appearance such as CSF and air appear black
Typical amount of contrast used for a CT of the Chest? - ANSWER 50-100 mL
Imaging protocol for CT of the Chest? - ANSWER 10 mm slices from the lung apex to the C/P angles
Prep for contrast? - ANSWER NPO 4-6 hours
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 Performance. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73243 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now