1ST QUIZ

Question 1

exactness of representation of the patient’s anatomic structures on the radiograph within the useful density range

Answer 1

Radiographic Quality

Question 2

radiograph that exactly reproduces the anatomic part.

-needed by radiologist to be able to make accurate diagnosis

Answer 2

HIGH QUALITY RADIOGRAPHS

Question 3

contain information that is difficult for human eye to interpret, which can lead to repeated X-rays or missed diagnosis

Answer 3

POOR QUALITY RADIOGRAPHS

Question 4

THREE MAJOR INTERRELATED CATEGORIES OF RADIOGRAPHIC QUALITY

Answer 4

Film factors
geometric factors
subject factors

Question 5

THREE IMPORTANT CHARACTERISTICS OF RADIOGRAPHIC QUALITY

Answer 5

HIGH RESOLUTION

• LOW NOISE

• PROPER SPEED

Question 6

is the ability to visually detect separate objects on a radiograph

Answer 6

resolution

Question 7

2 TYPES OF RESOLUTION

Answer 7

spatial resolution
contrast resolution

Question 8

refers to the bone versus soft tissue interface

Answer 8

spatial resolution

Question 9

spatial resolution is measured in

Answer 9

LINE PAIRS PER MILLIMETER (1P/mm)

Question 10

are terms commonly used when referring to spatial resolution

Answer 10

Details or visibility of detail

Question 11

degree of sharpness of on a radiograph

Answer 11

Detail

Question 12

allows the viewer to see detail because image and optical density are adequate.

Answer 12

visibility of detail

Question 13

contrast differences between similar tissues such as liver and spleen.

Answer 13

contrast resolution

Question 14

THREE COMPONENTS OF RADIOGRAPHIC NOISE

Answer 14

FILM GRAINiNESS
STRUCTURE MOTTLE
QUANTUM MOTTLE

Question 15

distribution and size the silver-halide of crystals in the emulsion of the film.

Answer 15

Film graininess

Question 16

similar to pilm graininess but refers to the phosphor of the radiographic screen rather than silver-halide crystals.

-is equally inherent and it contributes to little radiographer noise.

Answer 16

structure mottle

Question 17

Principal cause of the radiographic noise. -refers to the randomness with which a low. number of x-ray photons interact with the. intensifying screens.

Answer 17

quantum mottle

Question 18

ability of an x-ray film to respond to an X-ray exposure.

Answer 18

speed or sensitivity

Question 19

they are affected by image receptor speed.

Answer 19

RESOLUTION and NOISE

Question 20

Proper speed on the film-screen combination, limits patient dose but produces ____

Answer 20

high resolution, low noise radiograph.

Question 21

FAST IMAGE RECEPTORS

Answer 21

• (400, 600, and above)

•HIGH noise and Low resolution

Question 22

SLOW IMAGE RECEPTORS

Answer 22

(50,100, 200, and 300)

•Low noise and HIGH resolution

Question 23

performed when a STEP-WEDGE image is flashed onto an x-ray film to simulate an exposure

Answer 23

sensitometry

Question 24

performed when a STEP-WEDGE image is flashed onto an x-ray film to simulate an exposure- if not available, ______ maybe imaged.

Answer 24

ALUMINUM STEP-WEDGE

Question 25

image shows the shades of gray, which demonstrate radiographic contrast or variations in optical density

Answer 25

step wedge

Question 26

measures the light transmitted through the step-wedge increments

Answer 26

densitometer

Question 27

used in processing ac in imaging departments -used by film manufacturing to determine the characteristics of x-ray film.

Answer 27

sensitometry and densitometry

Question 28

•Testing sensitometry and Densitometry are similar, but the optical density (OD) numbers for film characteristics are plotted on _____

Answer 28

SEMI-LOGARITHMIC GRAPH.

Question 29

when OD is plotted in semi-logarithmic graph paper, the result is a

Answer 29

characteristic curve

Question 30

parts of characteristic curve

Answer 30

Toe and shoulder

Question 31

It is relationship between optical density and radiationbexposure plotted on a graph.

Answer 31

Hand D CURVE (HUSTER AND DRIFFIELD CURVE)

Question 32

slope of straight line portion

Answer 32

film contrast

Question 33

determine on the log op Relative exposure scale. Fast speed film film to the right the lept and low speed

Answer 33

speed

Question 34

range of exposure in the diagnostically useful range of the charactensfic curve.

Answer 34

latitude

Question 35

•HIGH EXPOSURE LEVEL

Answer 35

Shoulder

Question 36

Low exposure level

Answer 36

Toe

Question 37

Intermediate exposure levels -Region in which the optical density number from a properly exposed radiograph appear. When a characteristic curve is plotted from. densitometry numbers, CONTRAST, GRADIENT, and SPEED can be easily determined.

Answer 37

Straight line portion

Question 38

what are the characteristics that can be seen when characteristic curve is plotted from. densitometry numbers,

Answer 38

CONTRAST, GRADIENT, and SPEED

Question 39

are devices that measures optical density used to perform sensitometry and densito- metry.

Answer 39

Aluminum step wedge or Penetrometer & Densitometer

Question 40

a device that has a light source focused through a pinhole

Answer 40

DENSiTOMETER

Question 41

-numerical value calculated between the level. of light incident on a processed step wedge image (lo) and level. mitted through that film. light trans- it is a logarithmic function

Answer 41

optical density

Question 42

what are the characteristics that curve shows

Answer 42

film contrast speed latitude

Question 43

radiographic application

Answer 43

Fast image receptors slow image receptors