Norm Rad - Midterm Flashcards
The central ray beam comes out in what shape?
Cone Shape
What is part position?
The position of the body part being exposed to the beam.
What is meant by postural attitude?
The patient position. Ex: recumbent, seated, standing.
In case of extreme obesity what positioning is best and why?
Recumbent to displace adipose tissue.
What is the tube?
The portion of the machine where X-Ray radiation is produced and directed towards the patient.
What is tube tilt and do you do it for every film?
The angle of the X-Ray machine tube. Yes
What is an aka for Tube/Film Distance? What does it mean?
Focal/Film Distance
- the distance between the tube and the film. Most @ 40 inches
What is the portion of the x-ray machine which houses the grid and the cassette called?
The Bucky
What is the purpose of the Cassette?
Allows unexposed film to be in a lighted room unaffected.
What is known as the mechanism inside the tube utilized to limit the exposure field?
Collimation
What is the terminology used to describe towards the head or I-S?
Cephalad
What does Caudal mean?
Towards the feet or S-I
What does the single letter marker do?
It is a single letter that indicates the patient’s appropriate side of the body that is closest to the film during exposure.
What does RAO stand for?
Right anterior oblique
Describe the correct placement of the Markers
- never obstruct any anatomical structure with the marker
- carefully place markers so that they are not collimated out of the exposed area of the film
- do not place markers in the area of the nameplate.
What are the name of the markers that have a mercury ball inside a small dome or bubble?
Mitchell markers
What happens to the ball in the Mitchell markers when the bucky is upright?
The balls will be located at the bottom of the dome.
When the balls are centrally located where is the bucky?
Centrally located.
What is the patient position for a Lateral Cervical view?
Patient’s coronal plane is perpendicular to the bucky.
Do you want to shoot into concavity or convexity for a scoliosis? Why
Concavity
- because of the crash and scatter phenomenon
What does the lateral cervical view demonstrate?
Body heights and widths Disc height Cervical curvature ADI Sella Turcica Prevertebral soft tissue Airways
What should the ADI for adults be? Children?
Adults: less than 3mm
Kid: less than 5mm
What does ADI stand for and what are its boundaries?
Atlanto dental interval - space from the back of the anterior tubercle to the front of the odontoid process.
What is the AP normal range of the sella turcica in the lateral cervical view? The SI normal range?
Normal: 5-16mm
Average: 11 mm
Normal: 4-12 mm
Average: 8 mm
What interspace is found at C1-3 levels?
Retropharyngeal Interspace
The retrotracheal interspace is located at what vertebral levels?
C4-5