Quiz 3

Question 0

Client server based

Answer 0

• network systems
• images sent directly to archive server
• display workstation is client
• tech chooses where to send images

Question 1

RIS

Answer 1

• radiology information system

* holds radiology pt. Data

Question 2

Client server based; advantages/disadvantage

Answer 2

Advantage:
•all exams available to all in PACS 
•only one person can open an image
Disadvantage:
•if it goes down the whole system goes down 
•network dependent

Question 3

Distributed system

Answer 3

• Network system
• images stored in workstation until deleted
• can be sent anywhere on network

Question 4

Distributed system; advantages/disadvantages

Answer 4

Advantage:
•if server goes down images still on workstation
•can be sent to many locations at the same time
•less dependent on network
Disadvantage:
•only one person can work on it at one time
•harder for radiologist to read

Question 5

Web based

Answer 5

• network system

* images are stored centrally & not locally

Question 6

Web based; advantages/disadvantages

Answer 6

Advantages:
•greater flexibility with hardware/easier
Disadvantages:
•can be limiting cuz of hardware 
•dependent on network  connection

Question 7

Hanging protocols

Answer 7

•how images are displayed on the monitor

Question 8

Widow/level

Answer 8

Widow:
•represents gray levels CONTRAST
Level
•manipulates brightness

Question 9

MIP

Answer 9

• maximum/minimum intensity projection used when viewing structures
• used in CT to view contrast media in vessels

Question 10

MPR

Answer 10

•3D rendering technique

Question 11

VRT

Answer 11

•applies colors on CT images

Question 12

Stitching

Answer 12

•multiple images to create one complete image

Question 13

Archive server

Answer 13

•image storage

Question 14

DAS

Answer 14

•direct attached storage

Question 15

NAS

Answer 15

• network attached storage

* attached to network

Question 16

SAN

Answer 16

• storage area network
• high speed network
• linking different kinds of data storage

Question 17

Film digitizer

Answer 17

•scans analog film converting it to digital information

Question 18

Dry imagers

Answer 18

•used heat to process films

Question 19

CQI

Answer 19

• continuous quality improvement

* focuses on process rather than people or service

Question 20

How often should you check luminance , image quality, & geometric distortion

Answer 20

•daily

Question 21

Predetector collimation

Answer 21

•acts like a grid reduces scatter on CT

Question 22

Prepatient collimation

Answer 22

•reduces pt dose & determines the thickness of tissue slice

Question 23

Xray beam is attenuated according to what

Answer 23

• density
• atomic #
• the higher the atomic # the more attenuation

Question 24

Efficiency of scintillation detectors & gas detectors

Answer 24

•45%

Question 25

Gas detectors contain

Answer 25

•xenon or xenon krypton

Question 26

Computer temperature/humidity

Answer 26

• temp-below 20*

* humidity-less than 30%

Question 27

Uses pencil beam & water bag filtration

Answer 27

•early scanners CT

Question 28

MTF

Answer 28

• modulation transfer function

* expresses spatial resolution

Question 29

ERF

Answer 29

•edge response function

Question 30

Translation

Answer 30

•one pass or one sweep

Question 31

What gets applied to a sign wave to allow faster processing to manipulate the sign wave mathematically

Answer 31

•Fourier transformation

Question 32

What allows us to rotate the tube 360 degrees around the pt

Answer 32

•Slip ring technology

Question 33

Do we care about focal spot size in CT

Answer 33

•no

Question 34

Teleradiography

Answer 34

•allows films to be scanned & sent to radiologist

Question 35

CAD

Answer 35

•diagnoses suspicious densities

Question 36

Weakest link in digital chain

Answer 36

•the monitor

Question 37

4th generation CT disadvantage

Answer 37

• high pt dose
• high cost
• rotations limited by cables

Question 38

Array processor

Answer 38

•number crunching calculations

Question 39

Hounsfield

Answer 39

•helped to create CT