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Radiology Terminolog

QuestionAnswer
Scatter radiation The result of either classical scattering or the Compton effect.
Secondary radiation Radiation produced by the photoelectric effect.
Photoelectric effect One of three interactions of radiation with the human body tissues. In this effect, the x-ray photon is totally absorbed in the body tissue.
Grid ratio The effectiveness of a grid.
Grid lines Images on the radiograph produced by strips of lead placed in front of the cassette.
Stationary Grids High-frequency grids that do not move during exposure but they produce grid lines.
Grid cut-off Decreased radiographic density frequently accompanied by the appearance of obvious grid lines.
Parallel grid lead strips in a grid precisely aligned to the x-ray beam at a specific source-image distance. A grid whose radius is infinity.
Grid frequency The number of lead strips per inch in a grid.
Grid radius The focusing of
Abduction Away from body
Inversion Hand or foot turned inward
Midsagittal Dives body into equal right and left sections
Midcoronal Divides body into anterior and posterior sections
Transverse Cross-sectional slices of the body
Radiograph Images illustrated on x-ray film
Projection Path of beam
Anatomical Position Patient standing with palms up, head straight, arms at the side
Supine Lying on back
Prone Lying on front
Recumbent Patient lying down, not standing up
Trendelenburg Head lower than feet
Dorsal Back
Ventral Front
PA Central ray path from posterior to anterior
AP Central ray from anterior to posterior
Lateral Patient on side
Oblique Part angled sometimes 45 degrees
Decubitus Horizontal beam
Caudal Tube angled toward feet
Cephalic Toward head
Pronate To turn arm so that palm of hand faces down
Projection (Central Ray) Describes path of radiation as it goes from x-ray tube through patient to film.
Decubitus projection Patient is lying down and CR is parallel to horizon
Left Posterior Oblique Patient is lying face up with right side up and left side down.
Proximal Near the source
Inferior Below
Superior Above
Distal Farthest from the source
Flexion Bending of part
Extension Straightening of part
Right Anterior Oblique Patient's right anterior surface touching cassette at a 45-degree angle.
Medial Refers to parts toward the midline or middle of a part.
JRCERT Agency that accredits programs in RT
ASRT National professional society for technologists.
IEMA State agency that licenses technologists.
ARRT Certifying agency
ISSRT State professional society for technologists
What term refers to the study of the function of body organs? Physiology
Which term refers to a general body position? Recumbent
Deep Farther from the skin surface
Contralateral On the opposite side
Ipsilateral On the same side
Superficial Near the skin surface
Cephalad Toward the head end of the body
Caudad Away from the head end
AEC Automatic exposure control
mAs Milleampere-second
ASIS Anterior superior iliac spine
US Ultrasound
Plantar Sole of the foot
Intermediate Between a more medial and more lateral structure
Parietal Wall or lining of a body cavity
Visceral Covering of an organ
Dorsum Top or anterior surface of the foot or posterior surface of hand
Circumduction Circular movement of limb away from body
Rotation Turning or rotating of body/body part around its axis
Tilt Tipping or slanting a body part slightly
Fowler's Position Head higher than feet
Lithotomy Position Supine position with knees and hip flexed and thighs abducted and rotated externally, supported by ankle supports (Pap Smear)
Sim's Position Recumbent position with patient lying on left anterior side with left leg extended and right knee/thigh partially flexed
Dorsal Recumbent Lying on back
Ventral Recumbent Lying face down
Decubitus Position Patient lying down, CR is horizontal and parallel with floor
Lordotic Position Patient leans backward in upright position, with only shoulder in contact with IR
Lateral Projection Perpendicular CR enters either side of body/part, passes traversely along coronal plane, and exits opposite side
Tangential Projection CR directed toward outer margin of a curved body surface to profile body part just under surface
True Position Specifically indicates that body part must be placed exactly in anatomic position
Axial Projection Longitudinal angulation of CR with long axis of body or body part, 10 degrees or more
Created by: ladypolaris14
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