Digital Radiology

Question 1

What is the primary difference between film based and digital radiology?

Answer 1

Images are electronically captures, recorded and viewed at a computer terminal instead of using film and a view box

Question 2

The conventional screen film cassette is replaced by a reusable receptor called a _______

Answer 2

Detector

Question 3

Broad term for computers and components used to capture, transfer, store, retrieve and display medical digital information

Answer 3

PACS (Picture Archiving and Communication Systems)

Question 4

Unlike traditional screen film radiography, kVp has _____ effect on the contrast or latitude of the digital image

Answer 4

little to no effect

Question 5

The number of electrons trapped by the digital image receptor during an x-ray exposure is _____ related to the intensity of the xray beam

Answer 5

linearly

Question 6

Digital images have more ____ (more sahdes of gray) than film images

Answer 6

latitude

Question 7

Digital images can display ____ ____ body parts while simultaneously displaying soft tissue

Answer 7

high contrast

Question 8

_______ tools allow for viewing only bone or soft tissue from a single exposure

Answer 8

Subtraction

Question 9

While the radiation dose of CR systems is comparable to film-based systems _____ ____ is NOT.

Answer 9

Spatial resolution

Question 10

The spatial resolution of a general screen/film system is __-__ line pairs per _____

Answer 10

7-8, millimeter

Question 11

The spatial resolution of CR systems is often less than half that of general screen/film, ranging from ___-___ line pairs per ____

Answer 11

2.5-5, millimeter

Question 12

In the majority of applications, ___ does not perform as well as ___ in the spatial resolution category

Answer 12

CR does not perform as well as film

Question 13

CR is better than film in what area? (Which also impacts the diagnostic utlility of images)

Answer 13

Contrast resolution

Question 14

What imagine systems are available for viewing within several seconds of exposure?

Answer 14

CCDs and flat panel receptor digital imaging

Question 15

What imaging system has the disadvantage of having to be processed similarly to a cassette?

Answer 15

Computed Radiography

Question 16

Higher ___ does not affects the quality of the image as it is no longer affecting contrast and latitude in digital imaging

Answer 16

kVp

Question 17

In what circumstances are images unable to be corrected in digital imaging?

Answer 17

Patient motion, gross errors in exposure settings

Question 18

What has the highest possible standard of quality in image management?

Answer 18

DICOM

Question 19

The ____ signal (from the light emitted by the scintillating screens) is converted to a digital signal

Answer 19

analog

Question 20

The more bits the _____ the contrast resolution

Answer 20

higher

Question 21

The digital signal is represented as between __ and __ bits

Answer 21

8 and 12

Question 22

______ offers easy access to specialists who provide timely consultations on your ECG, radiograph or ultrasound images

Answer 22

Telemedicine

Question 23

The radiographic image is digitized into millions of tiny squares known as ____ aka ____ ____

Answer 23

pixels, picture elements

Question 24

Pixels are arranged into ____ and ____

Answer 24

rows and columns

Question 25

Matrix sizes depend on the digital _____

Answer 25

modality

Question 26

DR uses ____ pixels X ____ pixel matrix

Answer 26

2000 x 2500

Question 27

Each pixel represents an _____ _____

Answer 27

electronic signal

Question 28

The _____ corresponds to the intensity of the xray signal at any given location

Answer 28

pixel

Question 29

The smaller the pixel the ____ the image resolution

Answer 29

better

Question 30

Pixel size determines the _____ resolution

Answer 30

spatial

Question 31

Actual spatial resolution is determined by ____ size, image ____ plate, and the _____ ____ used

Answer 31

pixel size, image detector plate, mathematical algorithm