Exam (elaborations)
Chapter 4 DANB QUESTIONS AND ANSWERS GRADED A+
- Course
- Institution
Exam of 2 pages for the course DANB at DANB (Chapter 4 DANB)
[Show more]
Seller
Follow
julianah420
Reviews received
Content preview
Chapter 4 DANB3 Basic Requirements for Acceptable Radiograph - answer1. All parts must be imaged
as close to natural shapes/sizes.
2. Area must be imaged completely w/ enough tissue
3. Free of errors, show proper density, contrast, definition
Radiolucent - answer Portion of image that is dark/black. Permit the passage of xrays w/
little or no resistance. Pulp chamber/periodontal ligament
Radiopaque - answer Portion of image that is light/white. Radiopaque = dense,
absorb/resist passage of xrays... Enamel, dentin, bone
Density - answerdegree of darkness/image blackening. Light = little dense. Dark = more
dense. Blackness results when xray strike crystals.
Contrast - answerRefers to shades of gray separating dark/light areas. Good contrast =
enough shade to diff between structures.
Sharpness - answerRefers to detail/clarity of outline of structures on radiograph. Can be
affected by pixel size/distribution
Shadow Casting - answerRadiograph = 2D image of 3d object. Referred as Geometric
Factors...
Small focal spot = reduces size of penumbra (shadow around object) - sharper
image/less magnification. 16in PID
Long target-object distance - reduces penumbra/magnification - 16in PID
Short object-film distance - reduces penumbra/mag
Parallel relationship between obj. and film - less distortion
Perpendicular relationship between beam and object and film - prevents distortion
Factors affecting radiograph - answerContrast, Sharpness/definition, Magnification,
Distortion
Contrast... 1. Subject. 2. Kilovoltage (kV).. High kV = low contrast, Low kV = high
contrast. 3. Scatter radiation - don't want, decrease contrast. 4. Film/sensor type. 5.
Exposure - over/under exposed = poor contrast. Processing - improper time/temp = bad
contrast.
Sharpness - answer1.Focal Spot - Small = increase sharpness. Large = decrease
2.Target-image receptor distance - Long = increase sharpness. Short = decrease
3. Object-image receptor distance - Short = Increase sharpness.
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 CA$19.47. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76669 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now