Transcript Artifact - El Camino College

ARTIFACTS:
AN UNWANTED DENSITY
ON THE FILM
http://www.xray2000.co.uk/
1
Artifacts - Types
 Processing
Artifacts
 Exposure
Artifacts
 Handling
& Storage Artifacts
2
Processing Artifacts






Emulsion pickoff
Chemical fog
Guide-shoe marks
Water marks
Chemical spots
Guide-shoe & roller scratches
3
Developer Spots
4
Water spot
5
Discolored film due to
hypo (fixer) retention.
Chemicals not washed
off – over time will turn
film brown
6
Scratch marks from rollers in
automatic processor.
7
Exposure Artifacts







Motion
Improper patient position
Wrong screen-film match
Poor film/screen contact
Double exposure
Warped cassette
Improper grid position
8
Artifact
9
10
Blurred image due to
patient motion
11
PATIENT ARTIFACT JEWERLY
12
Handling & Storage
Artifacts






Light fog
Radiation fog
Static
Kink marks
Scratches
Dirty cassettes
13
Crimping /cresent mark
14
Double Exposure
2 exposures made on top of each other –
from poor handling of cassettes
15
16
Static electricity
17
Dirt on screen mimicking a foreign object.
18
Scratch marks from
improper handling.
19
Light fog
20
Kink mark or nail pressure mark
21
cast
22
POOR SCREEN CONTACT
23
Patient motion
24
motion
25
Double
exposure
Child
26
Poor
screen
contact
27
Double exposure
28
?
29
?
30
31
Pt
clothing
32
Hip
replacement
33
34
2 chest tubes in the patient
Patient swallowed batteries
What size are they?
35
36
PATHOLOGY NOT
ARTIFACT
37
Name &
cause
of this?
38
scratches
39
Digital image
Mis-
Registration
error
40
Roller marks from film stuck –
then pulled from processor
41
Hardware
In cervical
spine
42


Dust in imaging plate can
cause white marks on image
Both in film/screen and
computed radiography
43
E E G MONITOR
44
What do
you
See?
2
exposures
45
46
47
Evaluating Images
What do you think?
48
See anything
wrong
with
this
image?
49
Contrast? What influences this? (kVp in f/s)
50
Collimation – reducing the size of beam
helps to improve the image, and reduce the dose
to the patient
51
?
52