Development Of Modern Radiology Flashcards
Three general types of x-ray examinations
Radiography
Fluoroscopy
Computed Tomography
uses film or a solid-state image receptor and usually an x-ray tube mounted from the ceiling on a track that allows the tube to be moved in any direction.
Radiography
usually conducted with an x-ray tube located under the examination table. The radiologist is provided moving images on a television monitor or flat panel display.
Fluoroscopy
It uses a rotating x-ray source and detector array.
Computed tomography
External Components of an X-ray Machine
Support Structure
Protective Housing Glass/Metal Enclosure
It consists of two perpendicular sets of ceiling-mounted rails. This
allows for both longitudinal and transverse travel of the x-ray tube.
A telescoping column attaches the x-ray tube housing to the rails, allowing for variable source-to-image receptor distance.
Ceiling Support System
has a single column with rollers at each end, one attached to a ceiling mounted rail and the other attached to a floor-mounted rail.
Floor-to-Ceiling Support System
These systems are ceiling mounted and provide for very flexible x-ray tube positioning. The image receptor is attached to the other end of the C-arm from the x-ray tube.
C-Arm Support System
-A thin section of a glass/metal envelope through which useful beam emerges.
Window
The type of glass that is used in the construction of x-ray tubes is _____
pyrex
A region of the anode target in which electrons interact to produce x-rays. The size of the small focal spot ranges 0.1-1 mm while the large focal spot is 0.3-2 mm.
Focal Spot
Used when small body parts are being imaged. •Used when better spatial resolution is required. Associated with the small filament.
Small focal spot
Used when large body parts are being imaged.
Associated with the large filament.
Large focal spot
Atoms that have the same atomic number but different atomic mass numbers
Isotopes
Atomic nuclei that have the same atomic mass number but different atomic numbers
Isobars
