FILM MODULE 4

Question 1

refers to the fidelity with which the anatomical structure that is being examined is rendered on the radiograph.

Answer 1

radiographic image quality

Question 2

A radiograph that faithfully reproduces structure and tissues is identified as a

Answer 2

high quality radiograph

Question 3

To produce high-quality images, radiographers apply knowledge of the three major interrelated categories of radiographic quality

Answer 3

factors, geometric factors, and subject factors.

Question 4

The most important characteristics of radiographic image quality

Answer 4

resolution, contrast resolution, noise, and artifacts.

Question 5

is the ability to image two separate objects and visually distinguish one from the other.

Answer 5

redolution

Question 6

refers to the ability to image small objects that have high subject contrast, such as a bone–soft tissue interface, a breast microcalcification, or a calcified lung nodule.

Answer 6

spatial resolution

Question 7

is the ability to distinguish anatomical structures of similar subject contrast such as liver–spleen and gray matter–white matter.

Answer 7

contrast resolution

Question 8

is a term that is borrowed from electrical engineering

Answer 8

noise

Question 9

The flutter, hum, and whistle heard from an audio system constitute audio noise that is inherent in the design of the system.

Answer 9

noise

Question 10

is the random fluctuation in the optical density (OD) of the image.

Answer 10

radiographic noise

Question 11

refers to the distribution in size and space of silver halide grains in the emulsion.

Answer 11

film graininess

Question 12

is similar to film graininess but refers to the phosphor of the radiographic intensifying screen.

Answer 12

structure mottle

Question 13

to the random nature by which x-rays interact with the image receptor.

Answer 13

quantum mottle

Question 14

somewhat under the control of the radiologic technologist and is a principal contributor to radiographic noise in many radiographic imaging procedures.

Answer 14

quantum mottle

Question 15

NOTE

Answer 15

The use of high-mAs, low-kVp and of slower image receptors reduces quantum mottle.

Question 16

term used to loosely describe the sensitivity of film to x-rays. Resolution and noise are intimately connected with speed.

Answer 16

speed

Question 17

if the image receptor is fast what will be the noise and spatial resolution, and contradt

Answer 17

high noise, lowspatial reso and low contrast

Question 18

study of the relationship between the intensity of exposure of the film and the blackness after processing.

Answer 18

sensitometry

Question 19

H & D curve

Answer 19

Hurter and Driffield

Question 20

The two principal measurements involved in sensitometry

Answer 20

exposure to the film and the percentage of light transmitted through the processed film.

Question 21

Base plus fog OD has a range of approximately

Answer 21

0.1 to 0.3

Question 22

All images on the radiograph are larger than the objects they represent, a condition

Answer 22

magnification

Question 22

The ability of an image receptor to respond to a low x-ray exposure is a measure of its sensitivity or, more commonly,

Answer 22

speed

Question 23

It refers to the range of exposures over which the image receptor responds with ODs in the diagnostically useful range.

Answer 23

latitude

Question 24

Three principal geometric factors that affects radiographic quality:

Answer 24

1.Magnification
2.Distortion
3.Focal-spot blur

Question 25

relationship of Latitude and contrast

Answer 25

inversely proportional

Question 26

agnification is desirable and is carefully planned into the radiographic examination. This type of examination is called

Answer 26

Mmagnification radiography

Question 26

Unequal magnification of different portions of the same object is called

Answer 26

shape distortion

Question 27

Distortion depends on:

Answer 27

1. Object thickness
2. Object position
3. Object shape

Question 28

most important factor for determining spatial resolution

Answer 28

focal sot blur

Question 29

what is the size of the focal spot blur in anode and cathod side

Answer 29

anode small
cthode large