Digital Imaging (Ch 25-26)

Question 1

Define the term: analog image

Answer 1

a radiographic image produced by conventional film

Question 2

Define the term: bit-depth image

Answer 2

the number of possible gray-scale combinations for each pixel

Question 3

Define the term: charge-coupled device (CCD)

Answer 3

a solid-state image detector found in the intraoral sensor

Question 4

Define the term: complementary metal oxide semiconductor/active pixel sensor (CMOS/APS)

Answer 4

a silicone-based image detector used in digital imaging

Question 5

Define the term: digital image

Answer 5

an image composed of pixels

Question 6

Define the term: digital imaging

Answer 6

a filmless imaging system; a method of capturing a radiographic image using a digital sensor by breaking it into electronic pieces, and presenting and storing the image using a computer

Question 7

Define the term: digital subtraction

Answer 7

a digital radiography method that reverses the gray scale as an image is being viewed, making radiolucent images appear white and radiopaque images appear black

Question 8

Define the term: direct digital imaging

Answer 8

a method of obtaining a digital image in which an intraoral sensor is exposed to x-radiation to capture a radiographic image that can be viewed on a computer

Question 9

Define the term: digitize

Answer 9

in digital radiography, to convert an image into digital form that, in turn, can be processed by a computer

Question 10

Define the term: indirect digital imaging

Answer 10

a method of obtaining a digital image in which an existing radiograph is scanned and converted into digital form used a charge-coupled device (CCD) camera

Question 11

Define the term: line pairs/millimeter (lp/mm)

Answer 11

a measurement used to evaluate the ability of a computer to capture the resolution/detail of a radiographic image

Question 12

Define the term: pixel

Answer 12

in digital electronic images, digital information is contained in, and presented as, discrete units of information

Question 13

Define the term: sensor

Answer 13

in digital radiography, a small image detector that is placed intraorally to capture a radiographic image

Question 14

Define the term: storage phosphor imaging

Answer 14

a method of obtaining a digital image in which the image is recorded on a phosphor-coated plate and then placed into an electronic processor, where a laser scans the plate and produces an image on a computer

Question 15

Define the term: cone-beam computed tomography (CBCT)

Answer 15

computer-assisted digital imaging in dentistry that uses a cone-shaped x-ray beam to acquire information and present it in three-dimensions

Question 16

Define the term: DICOM data

Answer 16

the universal format for handling, storing, and transmitting three-dimensional images (DICOM = Digital Imaging and Communication in Medicine)

Question 17

Define the term: field of view

Answer 17

the area that can be captured when performing imaging procedures

Question 18

Define the term: multiplanar reconstruction (MPR)

Answer 18

the reconstruction of raw data into images when imported into viewing software to create three anatomic planes of the body

Question 19

Define the term: axial plane

Answer 19

a horizontal plane that divides the body into superior and inferior parts and runs parallel to the ground

Question 20

Define the term: coronal plane

Answer 20

a vertical plane that divides the body into anterior and posterior areas and runs perpendicular to the ground

Question 21

Define the term: sagittal plane

Answer 21

a vertical plane that divides the body into right and left sides and runs perpendicular to the ground

Question 22

Define the term: midsagittal plane

Answer 22

a vertical plane that divides the body into left and right sides directly through the midline of the body

Question 23

Define the term: contrast resolution

Answer 23

the number of gray scale colors available to be chosen for each pixel in the image

Question 24

Define the term: spatial resolution

Answer 24

a measurement of pixel size in multiplanar reconstruction

Question 25

Define the term: three-dimensional digital imaging

Answer 25

an image that demonstrates structures in three dimensions

Question 26

Define the term: three-dimensional volume rendering

Answer 26

a three-dimensional shape that is created from two-dimensional images

Question 27

Define the term: voxel

Answer 27

the smallest element of a three-dimensional image