Finger Anatomy
What finger is the first digit?
Thumb
What is the correct central ray for a PA projection of the 3rd digit?
Perpendicular to the 3rd digit PIP joint
Which bones make up the palm of the hand?
Metacarpals
What is the central ray for a PA hand projection?
Perpendicular to the third digit MCP joint
Wilhelm Roentgen
What does PIP stand for?
Proximal Interphalangeal Joint
Which two joint spaces should be open on a PA projection of any digit?
IP and MCP
How many bones are in one hand and wrist?
27
How much is the hand rotated for a PA oblique projection?
45 degrees
The X signified the unknown type of radiation.
What does MCP stand for?
Metacarpophalangeal joint
How many degrees is the finger obliqued for a PA oblique projection of the digit?
45 degrees.
Which carpal bone is the smallest?
Pisiform
What is the correct central ray for a lateral hand projection?
Perpendicular to the second digit MCP joint
Where are technical factors such as mAs and kVp set and who sets them?
At the control panel by the tech.
Which digit only has two phalanges?
Thumb
Should the anterior surfaces of the phalanges be convex or concave on a lateral projection?
Which carpal bone is moon-shaped?
Lunate
Which three metacarpal bodies have minimal overlap on a PA oblique projection of the hand?
third, fourth, & fifth
Where are X-rays produced?
In the X-ray tube
Which is more proximal on a phalange? The head or base?
Base.
Is the PA or AP thumb projection more magnified?
PA
What shape are metacarpals posteriorly?
Convex
On a fan lateral projection of the hand, what 3 things should be superimposed?
Metacarpals, distal radius, distal ulna
What is the path of radiation?
X-ray tube -> collimators -> to the patient -> to the image receptor -> image on the monitor.