Chapter 1 Flashcards
Image Receptor
The device that receives the energy of the x-ray beam and forms the image of the body part
4 Types of Image Receptors
- Cassette with Film
- Photostimulable Storage Phosphor Image Plate (PSP IP)
- Solid State Digital Detectors (Digital Radiography/DR)
- Fluoroscopic Image Receptor
Superimposition
The relationship of an atomic superimposition to size, shape, position, and angulation
Adjacent Structures
Each anatomic structure must be compared with adjacent structures and reviewed to ensure the structure is present and properly shown
Optical Density (OD)
Defined as the degree of blackening and brightness displayed on a digital display monitor
Density shows as
Blackening
Contrast
The difference in density between any two areas on a radiograph
Low contrast images displays…
Many density levels
High contrast images display…
Few density levels
Magnification
Anatomy on a radiograph always appears larger than its actual size so no other structure other than skin can be in contact with the IR
Object-to-Image Receptor distance (OID)
How far the body part is from the IR
Source-to-Image Receptor distance (SID)
How far the x ray tube is from the IR
Magnification increases with increased _____ and decreased _____
Increased OID
Decreased SID
Anatomic Position on Radiographs
Oriented on the display device this way. In this manner, the patient’s left side is on the viewer’s right side and vice versa.
PA Projection
Patient’s anterior (front) chest is placed closest to the IR
AP Projection
Patient’s posterior (back) placed closest to the IR
Exceptions to Anatomic Position in radiographs
Hands, fingers, wrists, feet, and toes
Lateral Radiographs
Patient’s right or left side placed against the IR. Hands up
Voluntary Breathing
Skeletal muscles. Controlled by CNS. These muscles perform the movement of the body initiated by the individual. Examples include nervousness, discomfort, mental illness, excitability, fear, age, and breathing
Involuntary Breathing
Organ muscles controlled by the autonomic nervous system and muscles contract rhythmically. Involuntary motion caused by heart pulsation, chill, peristalsis, tremor, spasm, and pain
All Radiographs must include:
Date
Patient’s Name or Identification #
Right or Left Marker
Institution Identity
Patient’s Age or DOB
Time of Day
Name of Physician
Position of Patient
