Exam 1.2: Digital X Rays Flashcards Preview

D2: 621 Radiology > Exam 1.2: Digital X Rays > Flashcards

Flashcards in Exam 1.2: Digital X Rays Deck (14)
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1

What are some advantages of Digital X Rays

Less exposure: Endo
Speed of image acquisition
Image manipulation
Electronic Records
Ease of viewing
No darkroom/chemicals

2

What are some disadvantages of Digital X-rays

Cost
Sensor dimension and cords
Infection control
Lack of standardization
Medicolegal

3

What are the two main digital systems?

Direct (Electronic Sensors)

Semi-Direct (Photostimulable Phosphor Plates)

4

How do direct sensors capture the image?

Sensor captures radiation and transfers signal directly to computer

5

How does the Semi direct PSP capture the image

Plates are irradiated producing a latent image in phosphor crystals

Laser scan then transfers image to CPU

6

What is a drawback when using direct sensors on premolar BWs and PAs

Can't capture D of canine and M of 1st PM

7

What are the advantages of Direct Sensors over PSPs

Instant image on screen
If sensor is still in place, you can adjust and retake image

8

What are advantages of PSPs

Accurate positioning
Durable
Flexible
More sizes available
Lower replacement costs
More comfortable

9

What is the range of available films

14-20 lp/mm

10

What is the resolution limit for the human eye

~11 lp/mm

11

What do you sacrifice when you increase resolution?

Contrast

12

What is the goal of DICOM

Try to get universal file formats that allow different software to recognize and transfer digital images seamlessly

13

What does PACS stand for?

Picture Archiving & Communications System

14

What are some practical concern for your private practice regarding digital xrays

Centralized storage and dedicated off site backup

DICOM conformity

Image appearance

HIPPA & Data encryption