Chapter 10: Imaging: Conventional and Digital

Question 1

Uses x-ray film and intensifying screen in image formation.

Answer 1

Film Screen Imaging

Question 2

Composed of emulsion spread on a thin transparent sheet of polyester plastic.

Answer 2

Radiographic film

Question 3

Spread on both sides of the polyester base sheet except in special cases like mammography.

Answer 3

Emulsion

Question 4

The film is placed between…

Answer 4

Intensifying Screens

Question 5

Are made of phosphor crystals that will fluoresce when struck by x-rays,

Answer 5

Intensifying Screens

Question 6

2 Types of Processing

Answer 6

Manual & Automatic Processing

Question 7

Any image acquisitioning process that produces an electronic image that can be viewed and manipulated in a computer.

Answer 7

Digital Imaging

Question 8

2 Types of Digital Imaging

Answer 8

Computed & Digital Radiography

Question 9

Contains photostimulable storage phosphor which store the radiation level receive.

Answer 9

Imaging Plate

Question 10

The CR ID Station transfers patient identification data from the modality workstation to the CR cassettes.

Answer 10

ID Tablet

Question 11

It scans the phosphor plate and extract the electronic latent image.

Answer 11

Image Reader

Question 12

Converts signals to digital form

Answer 12

Digital Electronics

Question 13

The latent image in DR is recorded on the electronic device. Cassette-less.

Answer 13

Digital Radiography

Question 14

2 Types of Digital Radiography

Answer 14

Direct and Indirect Capture

Question 15

One which first converts x-rays into light.

Answer 15

Indirect Method

Question 16

Light is emitted when x-rays strike a sensitive phosphor that must be converted to electric signal.

Answer 16

Indirect Imaging

Question 17

Does not require a light-emitting phosphor because x-rays interact directly with the element selenium, creating an electric charge.

Answer 17

Direct Digital Imaging

Question 18

Factors Affecting the Image (Rad. Quality)

Answer 18

Photographic & Geometric Quality

Question 19

Factors Affecting the Image (Rad. Density)

Answer 19

Air, Fat, Muscle, Bone, Metal

Question 20

Controls the current supplied to the filament of the x-ray tube.

Answer 20

mAs

Question 21

Time of exposure in seconds.

Answer 21

sec

Question 22

Voltage applied across the x-ray tube; energy of the x-rays

Answer 22

kVp

Question 23

Distance from the source of radiation to the image receptor.

Answer 23

Distance

Question 24

Increases the overall density of the image.

Answer 24

Fog

Question 25

Devices attached to the x-ray tube to reduce exposure field size thus decrease a proportion of the amount of scatter radiation.

Answer 25

Cones and Collimators

Question 26

Variations in density available on the radiograph.

Answer 26

Contrast

Question 27

Contrast inherent in the atomic part being examined.

Answer 27

Subject Contrast

Question 28

Any medium introduced into the anatomic part being radiographed that has a different radiation-absorbing potential increases the contrast.

Answer 28

Contrast Media

Question 29

A device placed between the patient and the image receptor that absorbs scatter radiation emitted by the patient before it reaches the film and therefore decreases density.

Answer 29

Grid

Question 30

The position of the x-ray beam does affect contrast.

Answer 30

X-ray Beam Angle

Question 31

A false representation of the true shape of the object.

Answer 31

Image Distortion

Question 32

The alignment of the object in relation to the x-ray tube and image receptor will determine the shape as seen in the radiograph.

Answer 32

Beam Alignment

Question 33

Distortion and Magnification result when the object of interest is located at some distance away from the image receptor.

Answer 33

Object-to-Image Distance

Question 34

Magnification can be reduced by increasing the SID

Answer 34

SID

Question 35

May be defined as the distinctness with which images of structures are recorded for viewing.

Answer 35

Radiographic Detail

Question 36

Geometric unsharpness is directly proportional to the size of the focal spot size; the smaller the focus, the sharper the structure lines

Answer 36

X-ray Tube Focal Spot Size

Question 37

Detail in the image is also controlled by the distance from the focus to the object or patient.

Answer 37

Focal-Object Distance