TBR-CT - Training From The BACK Of The Room Certified Trainer
TBR-CT - Training from the BACK of the Room Certified Trainer
Exam (elaborations)
PET CT Review Questions with Correct Answers
0 view 0 purchase
Course
TBR-CT - Training from the BACK of the Room Certified Trainer
Institution
TBR-CT - Training From The BACK Of The Room Certified Trainer
Exam of 8 pages for the course TBR-CT - Training from the BACK of the Room Certified Trainer at TBR-CT - Training from the BACK of the Room Certified Trainer (PET CT Review)
How do you correct for attenuation? - answerCT AC Map
Cs137/Ge68 Transmisson
Why is CT better for attenuation correction in PET? - answerDecrease noise on
attenuation map
Decrease acquisition time
Better anatomic info.
How are x-rays produced? - answerBremsstrahlung radiation - (braking radiation) A
charged particle interacts with an atom by entering the electron shell, slowing down, and
changing direction before exiting the electron shell. The atom emits the Brems Ray in
the form of an x- ray to get rid of the excess energy.
Characteristic radiation - electron ejected from inner shell, energy released as
characterisic x-rays as outer shell electrons drop into vacancies.
How are x-rays produced in an x-ray tube - answerCurrent is applied to the filament of
the cathode (-), this produces an electron cloud (and increases mAs). The electron
cloud is accelerated towards anode (+) when voltage is applied to the anode (increasing
kVp). The electrons strike the anode on the target producing x-rays.
When you increase kVp = - answerIncrease x-ray energy
Increase penetration of object
Decrease noise
Decrease beam hardening
Increase pt. dose
Decrease contrast
When you increase mA = - answerIncrease # of x-rays
Decrease noise
Increase contrast
Increast pt. dose
Hounsfield unit for water? - answer0
Hounsfield unit for air? - answer-1000
Hounsfield unit for bone? - answer1000
, What is reconstruction kernel? - answerAn algorithm applied to raw data that
determines the amount of smoothing during reconstruction process. It is necessary to
use more than one reconstruction kernel because of the different densities in the body.
What is the window width and level? - answerIt controls how the image is displayed.
The gray scale and filter is set by the operator to help differentiate tissue densities like
soft tissue or bone.
What is the DAILY QC for CT? - answerTube warmup
Air calibration
CT # accuracy
Image noise at clinical parameters
Eval of tomo uniformity
What pitch does diagnostic CT imaging use? - answerUses a lower pitch to increase
spatial resolution
What pitch does CT use for AC? - answerUses higher pitch (1 or higher)
From which part of the atom is the positron emitted? - answerNucleus
From which part of the atom is the x- ray emitted? - answerelectron shell
2. Define the following: Prompt coincidence - answertotal number of events detected by
the coincidence circuit
2. Define the following: True coincidence: - answerA pair of annihilation photons, from a
single event, striking 2 detectors at the same time
2. Define the following: Random coincidence - answerA false event, when 2 annihilation
photons reach 2 detectors at the same time, but originate from 2 different atoms/events.
↑ with ↑ activity and when 3D mode is used.
2. Define the following: Scattered coincidence - answerOriginated from the same
atom/event, but one or both scatter (Compton) and change direction before reaching 2
detectors at the same time. Approx. 50% of photons scatter
Describe Positron Emission. (What type of parent nucleus? What reaction occurs? What
results from this reaction and in what manner does it travel?) - answerWhen a proton
rich nucleus tries to become more stable it emits a positively charged electron from the
nucleus. The positively charged electron soon attract and collide with an -e causing an
annihilation reaction. This creates two 511 KeV photons that travel at high speeds 180
degrees apart.
What are the T1/2 life for the following
PET Radiopharmaceuticals:
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 julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
