lesson 5

Question 1

occurs prior to image being displayed where the
algorithms determine the image histogram, detector defects, are
removed

Answer 1

Preprocessing

Question 2

• the technologist does it to prepare the image for the radiologist through various user functions.
• may also be performed by the radiologist to produce specialized image to
  aid the diagnosis.

Answer 2

Postprocessing

Question 3

used to blacken out the
white collimation borders, effectively eliminating veil glare

Answer 3

automatic shuttering

Question 4

the unexposed borders
around the collimation edges allow excess light to enter the eye

Answer 4

Veil glare

Question 5

When anatomy or the area of interest is too large to fit on one image receptor, multiple images can be BLANK together using specialized software programs

Answer 5

Image Stitching

Question 6

Allows the selection of
preset terms and/or
manual text input and
can be particularly
useful when such
additional information is
necessary

Answer 6

Image Annotation

Question 7

it is the patient’s name, date of birth, health-care facility, patient ID, and examination date

Answer 7

Patient Demographics

Question 8

refers to the maximum high
voltage applied across an X-ray tube to produce the X-rays. (penetrability) affects
contrast

Answer 8

kVp

Question 9

a measure of radiation produced (milliamperage) over a set amount of time (seconds) via an x-ray tube. (dose) affects density

Answer 9

mAs

Question 10

the distance from the tube to the receptor. (influences factors such as contrast, distortion, magnification, and optical density)

Answer 10

SID

Question 11

a measure of radiation in the relevant image region on the receptor

Answer 11

Exposure Index (EI)

Question 12

The reference exposure is obtained when an image is
optimally exposed. It may be set by the manufacturer or by the local imaging center and is dependent on the body part, view, procedure, and imaging receptor

Answer 12

Target Exposure Index (EIT)

Question 13

quantifies how much the actual EI varies from the
EIT

Answer 13

Deviation Index (DI)

Question 14

a method of radiation dose monitoring used in radiographic and fluoroscopic studies. It
provides one indication of the radiation dose received by a patient and is the measurement used in dose audits

Answer 14

Dose area product (DAP) or kerma area product (KAP)

Question 15

used as an indication of
the dose received by the skin

Answer 15

Cumulative Air Kerma

Question 16

aims to estimate the highest dose to a single area of the skin (Gy). It gives a better estimation of deterministic risk

Answer 16

Peak Skin Dose (PSD)