F's Flashcards
feline polyarthritis:
A progressive, noninfectious, erosive or nonerosive inflammation of multiple joints with or without bone proliferation.
feline capital physeal dysplasia syndrome
A condition of unknown etiology in which osteonecrosis of the
femoral neck leads to pathologic fracture at the capita lphysis. May be unilateral or bilateral (if unilateral, the contralateral
limb often is affected within 6 to 12 months).
fibrous joint
A bony union with little mobility and lacking a joint cavity (e.g., sutures of the skull, attachment of hyoid bones to petrous temporal bone, attachment of tooth to alveolar bone). Other names: synarthrodial joint, synarthrosis.
field of view
Area of the body through which the primary x-ray beam passes. Field of view should be restricted to the area of interest by collimating the x-ray beam. Restriction of the field of view helps maximize image quality, minimize scatter radiation, and decrease distortion.
filament
A thin, threadlike conducting wire with a high melting point that forms the cathode (negative) part of the x-ray tube. It is the source of electrons.
filling defect
Anything that prevents contrast medium from occupying a hollow organ or space. Presents as a less opaque area(s) on a positive contrast study and a more opaque area(s) on a negative contrast study. May be caused by pathology or artifact.
film:screen system
Refers to a conventional radiography set up with a piece of x-ray film sandwiched between two intensifying screens and housed in a light-proof cassette.
fistulography
A radiographic contrast study used to investigate a fistulous tract or draining wound. Fistulogram
flail chest
Refers to instability of the thoracic wall caused by sequential segmental rib fractures that result in a portion of the chest wall becoming functionally detached. Flail chest is an emergency situation that results in paradoxical respiratory movements (detached portion is pulled inward during inspiration and pushed outward during expiration).
flexion
The bending of a limb or body part. Contrast extension.
fluoroscopy
A radiologic procedure using x-rays and a fluorescent screen to create real-time radiographic movies of anatomic structures. Fluoroscopy commonly is used to evaluate swallowing, GI motility, dynamic respiratory diseases,movements of the diaphragm, and for interventional studies. Patient and nearby personnel are exposed to relatively high levels of radiation. Modern fluoroscopy systems allow images to be viewed via electronic intensification, which enhances visibility and decreases exposure.
fluid level
The interface between fluid and gas, demonstrated by using a horizontal x-ray beam (e.g., standing lateralradiograph, erect ventrodorsal radiograph). Gas must be presentto document the fluid level (need to see gas-fluid interface).
focal spot
The area on the anode target of an x-ray tube that is struck by electrons and from which x-rays are emitted.
focal film distance (FFD)
The distance from the focal spot to the film or detector. Other names: source-to-image detector distance (SID), focal-receptor distance (FRD).
fogging
Refers to the nondiagnostic blackening (or graying) of a film radiograph. May be caused by scatter radiation, visible light, pressure, heat, or chemicals.
