問題一覧
1
what is the suggested SID for chest - extremities -
- 72 cm SID - 40 cm SID
2
- use of attenuating material - this absorb low energy x-rays Materials are: tungsten, copper, aluminum
Filtration
3
attenuating material that reduces the intensity of the beam to half its value
Half Value Layer
4
use of devices to confine x-ray ex. Collimators, cones/cylinder, diaphragms
Beam Limitation
5
does automatic collimation
Positive Beam Limitation
6
this absorbs scatter radiation
Grid
7
Types of Grid
- Parallel - Cris Cross
8
called the concept that color of light emitted must match the light sensitivity of the film
Spectral Matching
9
What are the 2 processing errors?
- Overexposed - Underexposed
10
What happens when the chemical temperature is too hot? causes chemical fog What happens when the chemical temperature is too cold?
- Density increases - Density decreases
11
What affects recorded detail? MDFS
- Motion - Distance - Focal Spot Size - SID/OID
12
2 Types of Motion
- Voluntary - Involuntary
13
distortion of definition on an image
Object Unsharpness a.k.a Blurring
14
focal spot that causes image sharpness
Small Focal Spot
15
the shadow on the side, causes unsharpness
Penumbra
16
shadow focused on the object
Umbra
17
- determines image quality - determine amount of detail - determined first by geometry of image formation
Sharpness
18
magnification of anatomical structure
Size Distortion
19
Shape distortion is caused by _____?
Angles
20
When the chemical is new, the factor is ? When the chemical is old, the factor is ?
- Increased - Decreased