Test 3

Question 1

In digital radiography the latent image is formed on the

Answer 1

Radiation detector

Question 2

In digital fluoroscopy each matrix pixel represents

Answer 2

Atomic number and mass density

Question 3

In digital radiography the brightness o the image is determined by

Answer 3

Pixel values

Question 4

Digital imaging could only be developed after advances were made in

Answer 4

Microprocessors and semiconductor memory

Question 5

Computed radiography developed in the 1970s with the use of _______ as the image receptor

Answer 5

Phosphor

Question 6

Scanned projection radiography was developed as a complement to

Answer 6

Computerized tomography

Question 7

What is the most recent development in digital radiography image receptors

Answer 7

Direct capture solid state devices

Question 8

Digital radiography first began to be used in clinical settings in the

Answer 8

1980s

Question 9

In digital radiography spatial resolution is improved with increased

Answer 9

Matrix ️size

Question 10

The dynamic range determines the degree of ______ in the image

Answer 10

️contrast ️resolution

Question 11

Special ️resolution is determined by the ratio of ______to _______

Answer 11

Field of view matrix ️size

Question 12

Scanned projection radiography differs from conventional radiography in the lack of

Answer 12

Scattered X-rays

Question 13

In scanned beam radiography the spacial ️resolution is determined by the

Answer 13

Number of detectors

Question 14

The primary limitation of framed beam radiography is

Answer 14

Long scanning time

Question 15

Computed radiography used a ______ for latent image formation

Answer 15

Photostimulable phosphor

Question 16

Conventional X-ray tubes an cassettes are used with _______ radiography systems

Answer 16

Computed

Question 17

Direct digital uses what to convert xray to electric signal

Answer 17

Amorphous selenium

Question 18

Direct digital benefits

Answer 18

Speed- immediate image
Better ️resolution (no diverging light)
Dose lower than CR

Question 19

Direct digital limitations

Answer 19

Must buy new equipment
Mobile/ tabletop considerations
Scatter will create image problems

Question 20

The science of ______ is the study of the response of the human eye to light

Answer 20

Photometry

Question 21

What is the basic photometry can unit

Answer 21

Lumen

Question 22

The decreasing luminous intensity with increasing distance from the source of light follows

Answer 22

Inverse square law

Question 23

A digital display monitor is best viewed

Answer 23

Straight on

Question 24

A liquid crystal is a material in a ______ state

Answer 24

State between a liquid and a solid

Question 25

Almost all digital images in medical imaging are viewed and interpreted in a

Answer 25

Digital display device

Question 26

A digital display device with higher megapixels has better spacial ️resolution T/F

Answer 26

True

Question 27

Almost all medical flat panel digital display devices are

Answer 27

Monochrome liquid crystal displays

Question 28

Medical flat panel display devices are identified by the

Answer 28

Number of pixels

Question 29

Compared to CRTs AMLCDs have

Answer 29

Better ️contrast Better gray scale definition Less intrinsic noise

Question 30

An advantage to viewing the AMLCDS screen is that the image quality is equally good viewed from any angle T/F

Answer 30

False

Question 31

The ambient light at a digital image workstation should be

Answer 31

Near darkness

Question 32

Processing the digital image is done____ and post processing is done_____

Answer 32

Automatically | Manually

Question 33

Flat fielding is accomplished through automatic calibration images called ______ and ______

Answer 33

Offset images and gain images

Question 34

Reregistering an image to correct for pt motion is done with

Answer 34

Pixel shift

Question 35

A compilation of the mean pixel value within a region of interest is performed for

Answer 35

Quantitative radiology

Question 36

Post processing includes

Answer 36

Image inversion Annotation Pixel shift

Question 37

_______ is corrected by the application of an offset voltage

Answer 37

Image lag

Question 38

PACS stands for

Answer 38

Picture Archiving and Communication Systems

Question 39

Within a PACS network the secretarial workstation and the viewing workstation would both be called

Answer 39

Clients

Question 40

The national standard for image transmission in teleradiology is the ______ format

Answer 40

DICOM

Question 41

Text data and email are generated at a ______ workstation in PACS

Answer 41

RIS Radiology Information System

Question 42

Image file size is determined by______size and gray scale

Answer 42

Matrix

Question 43

What is the file size of an image with a 1026 x 1026 matrix and a 2.5 byte gray scale

Answer 43

2.6 MB | 1026x1026=1052676x2.5=263169 bytes

Question 44

Scotopic is

Answer 44

Night vision controlled by RODS | AKA Rods vision

Question 45

Rod cells see in

Answer 45

Black and white and in dark light

Question 46

Photopic is

Answer 46

Day vision controlled by cone cells | Aka comes vision

Question 47

DICOM stands for

Answer 47

Digital Image communication in Medicine

Question 48

What is HL7

Answer 48

Software standards established for exchanging info in health care

Question 49

Two systems for film digitizes (scanners)

Answer 49

Laser | CCD linear array

Question 50

Hard copy = | Soft copy =

Answer 50

Hard - can hold in hand | Soft- viewed on monitor

Question 51

What is a CRT

Answer 51

Old school big bulky monitor

Question 52

What is LCD (AMLCDS)

Answer 52

Flat screen new school monitor

Question 53

Digital imaging techniques are always applied to

Answer 53

CT Ultrasound MRI

Question 54

T/F DR is hard wired to CPU

Answer 54

True