Exam (elaborations)
Chapter 6 CCD. questions and answers already passed 2024
- Course
- Institution
Chapter 6 CCD. questions and answers already passed 2024
[Show more]
Content preview
Chapter 6 CCD / CMOS Image CaptureCharge-coupled devices - correct answer ✔The oldest indirect conversion
digital radiography system used to acquire a digital image
CCD - correct answer ✔X-ray photons interact with a scintillation material,
and the light is transmitted by lenses or fiber optics
- light converted to electricity, where it is stored in capacitors
- Charge = released line by line, & sent to ADC
CCD structure & function - correct answer ✔- light sensitive silicon chip
- Light from scintillator hits chip, & electron-hole pairs are produced (light to
energy conversion)
- Electrons = held in silicon until charge is read out to form the image
Light - correct answer ✔In CCD, the amount of electron-hole pairs is
released to the amount of __________ absorbed.
Readout - correct answer ✔In CCD, electrons are held in a well until when?
An electrical potential well - correct answer ✔In CCD, where are the
electrons held on the detector element?
Bucket brigade scheme - correct answer ✔Voltage gates are opened &
closed at readout to allow the flow of electrons. Electricity is flowing and
image formation is being sent from the detector (1 line at a time) to the ADC
then on to the comp. workstation
, Readout - correct answer ✔Bucket brigade scheme is also known as what?
Very quickly - correct answer ✔Bucket brigade scheme (readout) requires
that the movement of the electrons be carefully timed. This process occurs:
Blooming effect - correct answer ✔Overfull of the DELs will cause what?
Adjacent - correct answer ✔Excess electrons spill out of the DEL into an
__________________ DEL.
Overflow drains - correct answer ✔What are built into the detector to prevent
blooming?
How many incident x-ray photons are absorbed, amount of light produced by
scintillator, wavelength - correct answer ✔The scintillator and the way it is
constructed will determine:
2, Structured & unstructured (turbid) - correct answer ✔How many main
types of scintillators are there? and what are they?
Light - correct answer ✔Scintillators always produce what?
CsI - correct answer ✔Is considered structured (needle-like crystals)
Gd2O2S - correct answer ✔Is considered unstructured (powder-like grains)
Critical contributors - correct answer ✔The optics in a CCD are
______________ _________________ to the quality of the digital 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 LEWISSHAWN55. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81113 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now