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Unit 1 Terms

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Unit 1 Terms

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Unit 1 Terms

Created by

Natalie Leal
Natalie Leal
United States

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Unit 1 Terms
 

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Unit 1 Terms

by Natalie Leal
A
B
C
D
E
F
G
H
I
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y

Starts with A

Anything unwanted on the image that can interfere with seeing anatomy or pathology.

Starts with B

The number of bits used to store each pixel value; influences image contrast and contrast resolution

Starts with C

The ability to distinguish structures with similar tissue density or thickness as separate entities

Starts with D

How efficiently the detector converts x-rays into a useful image signal.

Starts with E

A number used to indicate the amount of exposure reaching the image receptor

Starts with F

Considered preprocessing, this is a software correction that is performed to equalize the response of each pixel to a nonuniform X-ray beam. Corrects anode heel, dead pixels, and tiling artifacts.

Starts with G

This artifact is caused by: Improper grid alignment, Incorrect SID, Improper tube angulation. Results in uneven image brightness.

Starts with H

The x-axis has the pixel brightness value and is related to the amount of exposure to the image plate; the y-axis displays the number of pixels with that brightness value for each exposure

Starts with I

the amount of luminous flux incident per unit area, or the amount of light that is projected onto a given surface. Expressed in Lux. Examples: collimator light, ambient light in the room

Starts with K

This unit is the same as DAP and is the product of the total air kerma and the area of the x-ray beam at the entrance of the patient.

Starts with L

This is the luminous intensity per unit of projected area of source, or the amount of light that is emitted or scattered from a particular source. Expressed in Nits. Examples: Monitors and lightboxes

Starts with M

A measure of how much detail from the part is actually recorded in the image. Formula: information recorded in the image divided by information recorded in the part.

Starts with N

The system’s “detail limit”, the highest spatial frequency it can accurately record before information is lost. If sampling occurs less than twice per cycle, information is lost…

Starts with O

__ of 500% and underexposures as low as 60% can be rescaled without losing image quality.

Starts with P

_____ or diagnostic display devices are those that will be used for the interpretation of diagnostic images by radiologists and other providers.

Starts with Q

This artifact is caused by quantum mottle, which is the statistical fluctuation in the number of photons per unit area that contribute to image formation.

Starts with R

A systematic process catalogs rejected images identifies the reason for the repeat helps minimize or eliminate future repeats.

Starts with S

the ability of an imaging system to create separate images of closely spaced high-contrast (black-and-white) objects

Starts with T

This artifact is caused by: Differences between detector elements. Appears as: Subtle brightness variations Corrected with: Flat-fielding software.

Starts with U

Too little exposure to the image receptor; digital processing may correct brightness, but noise can still remain.

Starts with V

The useful anatomy data selected from the histogram before the image is sent to the LUT for rescaling.

Starts with W

This controls image brightness in digital modalities.

Starts with X

On a histogram, this shows the pixel brightness value and is related to exposure to the image plate.

Starts with Y

On a histogram, this displays the number of pixels with each brightness value. Frequency

 
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