Exam 2 Medical Image

Question 1

What is the magnification factor?

Answer 1

Image Size/Object Size

Question 2

Photometry is the science of the:

Answer 2

response of the human eye to visible light

Question 3

The purpose of Digital Imaging and Communications in Medicine (DICOM) is to:

Answer 3

transfer images

Question 4

High penetrability = High ___________ rays

Answer 4

quality

Question 5

The IDC codes were developed by the American Medical Association.

Answer 5

False

Question 6

___ is misrepresentation of object size & shape on the image.

Answer 6

Distortion

Question 7

The production of heat in the anode __ directly with increasing x-ray tube current.

Answer 7

Increases

Question 8

All of the following are types of filtration, except:

Answer 8

Compounding filters

Question 9

What principal factors influence the shape of the x-ray emission spectrum? (Select all the apply.)

Answer 9

1. Electrons with low KE
2. Relatively thick target causing multiple interactions of projectile electrons with lower energy
3. Added filtration

Question 10

Adaptation of computer technology to mimic the human mind in cognitive activities is _______________.

Answer 10

Artificial Intelligence

Question 11

Visibility of Image Detail is best measured by ___

Answer 11

contrast resolution

Question 12

___ is the computer programs that tell the hardware what to do and how to store and manipulate data.

Answer 12

Software

Question 13

The ___ changes the amplitude and shift of an X-ray Emission Spectrum.

Answer 13

kVp

Question 14

List the stages of digital radiographing in order.

Answer 14

1. Capture
2. Coupling
3. Collection

Question 15

The probability of Compton scattering depends on the atomic number of the target atom. (T/F)

Answer 15

F

Question 16

When assessing image quality, what would be considered a geometric factor?

Answer 16

Image Blur

Question 17

postprocess technique, Image inversion

Answer 17

Makes Image White/Black

Question 18

postprocess technique, Subtraction (DSA)

Answer 18

Improve image contrast

Question 19

postprocess technique, Pixel shift

Answer 19

Correct a image for patient motion

Question 20

postprocess technique, Region of Interest (ROI)

Answer 20

Determines average pixel value for use in quantitave imaging

Question 21

When selecting technique factors, keep exposure time as ___ as possible to ensure penetrability.

Answer 21

High

Question 22

Image Receptor sometimes referred to a ____.

Answer 22

cassette

Question 23

Bremsstrahlung x-rays have a ___of energies.

Answer 23

Range

Question 24

Flatfielding is used to

Answer 24

reduce noise & improve contrast

Question 25

PAC's primary use is to:

Answer 25

store digital images

Question 26

Software computer components include (3)

Answer 26

1. Bits 2. Words 3. Bytes

Question 27

PACS primary purpose is to

Answer 27

store and share images electronically

Question 28

Sthenic is

Answer 28

"Strong active" average patients

Question 29

Hypersthenic

Answer 29

Thin, but healthy appearing

Question 30

Hyposthenic

Answer 30

Big frame usually over weight

Question 31

Asthenic

Answer 31

Small, frail

Question 32

Increasing filtration _____________ the average energy of an x-ray beam and x-ray intensity _______________.

Answer 32

Increases, decreases

Question 33

The CPT codes were developed by the American Medical Association. (T/F)

Answer 33

True

Question 34

Process by which very high-energy x-rays can escape interaction with electrons and the nuclear electric field and can be absorbed directly by the nucleus is:

Answer 34

Photodisintegration

Question 35

Image artifacts can typically be minimized through proper alignment. (T/F)

Answer 35

False

Question 36

Absorption of an x-ray by ionization is:

Answer 36

Photoelectric Effect

Question 37

What is the relationship between x-ray intensity & mAs

Answer 37

Direct relationship

Question 38

Image inversion, a post-processing manipulation, refers to:

Answer 38

Turning white-black & black-white

Question 39

If the kVp are increased, then the electron kinetic energy will ____________.

Answer 39

increase

Question 40

Sharpness of Image Detail describes the ability to see the detail on the image. (T/F)

Answer 40

False

Question 41

What does "Annotation" do

Answer 41

Labes the images

Question 42

What does "window and level" do

Answer 42

expand digital gray scale

Question 43

What does "magnification" do

Answer 43

Improve visualization and spatial resolution

Question 44

What does "image flip" do

Answer 44

Reorient image presentation

Question 45

What characteristic of radiographic quality is improved by using reduced x-ray exposure time?

Answer 45

Motion blur

Question 46

An increase in mAs which increases the number of x-rays produced, ___________ the amplitude of the spectrum.

Answer 46

increase

Question 47

Contrast resolution refers to:

Answer 47

ability to distinguish between and to image similar tissues

Question 48

Barium is considered a ___ contrast agent.

Answer 48

positive