LESSON 7

Question 1

→ the receiver of the image being exposed

→ either film or digital

Answer 1

IMAGE RECEPTORS

Question 2

can be intraorally or extraorally placed

Answer 2

IMAGE RECEPTORS

Question 3

What are the types of IMAGE RECEPTORS?

Answer 3

Radiographic film

Digital Receptors

Question 4

→ direct action or packet film
→ indirect action film used in conjunction with
intensifying screens in a cassette

Answer 4

Radiographic Film

Question 5

→ solid-state sensors
→ phosphor plates

Answer 5

Digital Receptors

Question 6

refers to the numeric format of the image content & its discreteness

Answer 6

DIGITAL RECEPTORS

Question 7

(2) types of direct digital image receptors available

Answer 7

o Solid-State

o Photostimulable Phosphor Storage Plates

Question 8

uses of DIGITAL RECEPTORS in Intraoral

Answer 8

periapical and bitewing

Question 9

uses of DIGITAL RECEPTORS in Extraoral

Answer 9

panoramic and skull

Question 10

advantages of what?

o eliminates chemical processing
o digital intraoral receptors require less radiation than film,
thus reducing patient exposure
o allows enhancements, measurements, and corrections not
available with film

Answer 10

DIGITAL RECEPTORS

Question 11

disadvantages of what?

o the initial expense of setting up a digital imaging system is relatively high

o certain components are susceptible to rough handling and are costly to replace

o there is a risk of systems becoming obsolete or manufacturers going out of business

o the excellent image quality and comparatively low cost of a properly exposed & processed film keeps film-based radiography competitive with digital alternatives

Answer 11

DIGITAL RECEPTORS

Question 12

These are under of DIGITAL RECEPTORS in?

INTRAORAL

EXTRAORAL

Answer 12

SOLID-STATE SENSORS

Question 13

small, thin, flat, rigid rectangular boxes, usually black & similar in size to intraoral film packets

Answer 13

INTRAORAL

Question 14

→ vary in thickness from about 5-7 mm

→ cabled to allow data to be transferred directly from mouth to
computer
o cables are usually 1-2 m long

Answer 14

INTRAORAL

Question 15

not autoclavable and need to be covered with a protective plastic barrier envelope for infection control purposes

Answer 15

INTRAORAL

Question 16

CCD

Answer 16

charge-coupled device

Question 17

complementary metal oxide semiconductors

Answer 17

CMOS

Question 18

individual pixels, consisting of a sandwich of P- and N-type silicon, are arranged in rows and columns called an array or matrix, above which is a scintillation layer

Answer 18

CCD (CHARGE-COUPLED DEVICE)

Question 19

→ the x-ray photons hit the scintillation layers and are converted to light
→ the light interacts via the photoelectric effect with the silicon to create a charge packet for each individual pixel, which is concentrated by the electrodes

Answer 19

CCD (CHARGE-COUPLED DEVICE)

Question 20

the charge pattern formed from the individual pixels in the matrix represents the latent image

o the image is read by transferring each row of pixel
charges from one row to the next

Answer 20

CCD (CHARGE-COUPLED DEVICE)

Question 21

→ different in way that the pixel charges are read
o each CMOS pixel is isolated from its neighbor and directly connected to a transistor
→ less expensive

Answer 21

CMOS (COMPLEMENTARY METAL OXIDE SEMICONDUCTORS)

Question 22

→ contain CCDs in long, thin, and linear arrays
→ the CCD array is incorporated into (2) different designs of
sensor

Answer 22

EXTRAORAL

Question 23

o flat cassette-sized sensors designed to be retrofitted into
existing film-based panoramic equipment to replace
conventional cassettes

o individually designed sensors as part of completely new
solely digital panoramic or skull equipment

Answer 23

2 different designs of
sensor in EXTRAORAL

Question 24

→ consists of a range of imaging plates that can be used for both intraoral and extraoral radiography

→ the plates are not connected to the computer by a cable

Answer 24

PHOTOSTIMULABLE PHOSPHOR STORAGE PLATES

Question 25

→ once cleared (erased), the plates are reusable
→ intraoral plates need to be inserted into protection barrier
envelopes for control of infection purposes

Answer 25

PHOTOSTIMULABLE PHOSPHOR STORAGE PLATES