Sensors and Digital Imaging part 2

Question 1

size of psp plates

Answer 1

available in same size as dental film

Question 2

what protects the psp plates from the light?

what is the carrier called that makes the light tight?

Answer 2

barrier envelopes

plate transfer box

Question 3

what are the psp plate scanners

Answer 3

scanX (air techniques)
scanX intraoral (air techniques)
DenOptix (gender Dental systems)

Question 4

what is the extra component of direct digital system only for CCD

Answer 4

ADC
analog-to-digital converter

-goes here to be read

Question 5

what is the process/components of direct digital system

Answer 5

1. x-ray source
2. CCD/CMOS
3. digital interface cord
4. ADC for CCD only
5. screen monitor
6. CPU, server, or PACS
7. printer EPR PACs

Question 6

what are the components of the sensor

Answer 6

-plastic housing[simplifier]
-CMOS imaging chip [pixel layer]
-fiber optic face plate [FOP]
-CSI scintillator [optimized for resolution]

Question 7

sensors have 2 areas:

what are the pros and cons of these sensors:

Answer 7

1. external size
2. internal active area- the portion of the sensor producing the image

pro: quick
con: sensor smaller, less comfortable, 70-80% less than actual size

Question 8

what was the first digital sensor device?

what is newer (kinda) and used more?

Answer 8

1. CCD- charged coupling device
2. CMOS- complementary metal-oxide semiconductor

Question 9

this process is where x-ray photons cause ionization of pixel silicone; ejected electrons’ are trapped in the pixel similar to the charge in a battery

Answer 9

digitization for CCD, CMOS

Question 10

this concept is where each pixel is like a tiny battery with its charge equal to the number of electrons trapped inside. the computer records the charge in each pixel and converts it into a gray value

Answer 10

simplified sensor concept

(digitization for CCD, CMOS)

Question 11

inside the computer, the electronics instantaneously “reads” the charge in each pixel, converting the charge into

Answer 11

256 or more shades of gray

Question 12

to be able to manipulate the image, the computer will turn the voltage signal to

Answer 12

numbers and then to shades of gray

Question 13

each pixel is characterized by

Answer 13

its location and intensity

Question 14

sensor thickness:
size:
shape:

Answer 14

4-6mm
same size as dental film
square, rounded or cut

Question 15

sensor image quality

pixel size

Answer 15

15 microns

dental images are not as sharp as film