Exam (elaborations)
RADIOLOGY FINAL EXAM WITH ALL QUESTIONS PERFECTLY ANSWERED!!
- Course
- Institution
RADIOLOGY FINAL EXAM WITH ALL QUESTIONS PERFECTLY ANSWERED!!
[Show more]
Content preview
RADIOLOGY FINAL EXAM WITH ALL QUESTIONSPERFECTLY ANSWERED!!
Energy
Answers :what occurs when matter is altered
wavelength
Answers :the distance between the crest of one wave and the crest of the next
frequency
Answers :number of wavelengths that pass a given point
radiation components
Answers :the dental x ray machine consists of 3 visible components:
- control panel
- extension arm
- tubehead
Tubehead: metal housing
Answers :the metal body of the tubehead that surrounds the x ray tube and
transformers and is filled with oil. It protects the x ray tube and grounds the high
voltage components.
Tubehead: Insulating oil
Answers :oil that surrounds the x ray tube and transformers inside the tube head
- prevents overheating by absorbing the heat created by the production of x rays
Tubehead seal
, Answers :leaded glass covering of the tubehead that permits the exit of x rays from
the tubehead
xray tube
Answers :the heart of the x ray generating system
tubehead: transformer
Answers :device that alters voltage of incoming electricity
Tubehead: aluminum disks
Answers :- 0.5 mm thick of aluminum placed in the path of the x ray beam
- filter out the non penetrating, longer wavelengths (long and lazy)
tubehead: lead collimator
Answers :- a lead plate with a central hole that fits directly over the opening of the
metal housing where the x ray exits
- Restricts size of x-ray beam
Tubehead: Position-indicating device (PID)
Answers :- open-ended, lead lined cylinder that extends from the opening of the
metal housing of the tubehead
- aims and shapes the x ray beam
Cathode
Answers :- negative electrode
,- consists of a tungsten wire filament in a cup shaped holder made of molybdenum
- supply the electrons necessary to generate x rays
- electrons produced here are accelerated toward the positive anode
The cathode includes the:
Answers :tungsten filament- coiled wire made of tungsten, produces electrons
when heated
molybdenum cup- focuses the electrons into a narrow beam and directs the beam
across the tube toward the tungsten target of the anode
anode
Answers :- positive electrode, consists of a wafer-thin tungsten plate embedded in
a solid copper rod
- converts electrons into x-ray photons
The anodes include:
Answers :tungsten target- plate of tungsten, which serves as a focal spot and
converts bombarding electrons into x-ray photon
copper stem- functions to dissipate the heat away from the tungsten target
Production of Dental X-rays
Answers :- the electrons stay in an electron cloud until the high-voltage circuit is
activated
- when the exposure button is pushed, the high-voltage circuit is activated
, - the molybdenum cup in the cathode directs electrons to the tungsten target into
anode
- when electrons strike the tungsten target, less than 1% of the energy is converted
to x-rays and the remaining 99% is lost as heat
general radiation- braking radiation (bremsstrahlung)
Answers :- the term braking refers to the sudden stopping of high-speed electrons
when the hit the tungsten target in the anode
- produces 70% of the x rays (electrons that hit or pass closely to anode are
converted into x ray photons)
Characteristic radiation
Answers :x-ray photons are produced when electrons replace other electrons in the
inner shell (very few x-rays are produced in this manner)
radiation quality
Answers :- energy or penetrating ability of the x-ray beam
- controlled by the kilovoltage
- x-rays with shorter wavelength have more penetrating power (more energy!)
radiation quantity
Answers :- the number of x-rays produced
- controlled by milliamperage
radiation intensity
Answers :- total energy contained in the x-ray beam in a specific area at a given
time
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 IANWAZASKISTUVIA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now