Basics Flashcards
The more kVP the more …
Energy
Quality
Penetration
Scatter
KVP is highly associated with what?
Imagine density
For extremities would a larger or smaller FSS be preferable ?
Smaller
mAs will increase …
Amount of photons and interaction
Patient absorbed dose
IMAGE DENSITY
mAs is associated with
Quantity
Density
kVp is associated with
Quality
Penetration
Contrast
Radio-opaque is described as ?
White area where xrays have been absorbed
Radio lucent is described as
Black areas where transmission has occurred and little absorption. E.g air
Density is
The degree of blackening in an image
Is long scale association with a low or high kVP
High
Symptoms of RA
Swollen and inflamed synovial membrane
Bone erosion
Sympotoms of OA
Calcification
‘Bone on bone
Thinned cartilage
What projection is used to image bone age ?
PA of left hand
What is the FFD for a bone age projection ?
76cm (DR)
At what age does the scaphoid bone ossify ??
4-6 years
What are the 2 routine hand projections ?
PA
PA oblique
PA hand key points
Centre @ 3rd MCP joint
KVP - 45
Mas - 2.5
Fine focus, no grid
What size imagine plate would be used in CR for a PA hand?
24x30cm
Critique of a PA hand
No rotation (symmetry)
No super imposition.
No soft tissue overlap
Joint space open
What is a lateral projection of the hand best used for ?
Foreign body localisation
Fracture alignment
What is PA of both hands sometimes used for ?
Evaluation of arthritis conditions
What is Norgaard method used for??
Rheumatoid Arthiritis
mAS
kVp
Centre
LATERAL HAND
4.5
50
2nd MCP joint
Critique of lateral hand
Phalanges are forearm Superinposed
Thumb free of SI and of motion
KVP
MAS
CENTRE
NORGAARD
45
2.5
Between hands at MCP joint level
Norgaard critique
Midshafts of 2-5 free of SI
MCP joints open
Imaging plate size of PA and PA oblique and lateral of hand
PA’s : 24x30
Lateral : 18x24
Standard finger projections
PA
PA OBLIQUE
LATERAL
KVP
MAS
CENTRE
PA FINGER
42
2
PIP joint
KVP
MAS
CENTRE
PA oblique
42
2
PIP JOINT
KVP
MAS
CENTRE
LATERAL FIGNER
42
2
PIP
Critique of lateral finger
Concave of bone surface is anterior
Little overlap
Open joint space
Imaging plates for finger projections
Fit them all on 18x24
Standard thumb projections
AP/PA
PA oblique
Lateral
KVp
MAS
Centre
ap of thumb
42
2
MCP
Critique of thumb PA/AP
Trapezium included
KVP
MAS
CENTER
PA OBLIQUE THUMB
42
2 MCP
Critique PA oblique thumb
Trapezium visible
45 degree angle of thumb
KVP
MAS
CENTRW
LATERAL OF THUMB
42
2
MCP
Critique lateral thumb
Trapezium
Concave surface on anterior of thumb
Name all the types of fractures
Incomplete Transverse Oblique Spiral Comminuted Avulsion Butterfly Segmental Green stick Torus