Del Medical EPEX Omniflex IV, Руководство по обслуживанию

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EPEX/Omniflex IV System Service Manual
GL-10 Glossary
RISC Reduced Instruction Set Computer.
Roentgen The unit of radiographic exposure dose designed by the symbol R. One
R of exposure will produce in tissue an absorbed dose of approximately
one rad. Named after Wilhelm Conrad Roentgen, the scientist that
discovered X-rays in 1895.
Roentgen Equivalent Man
(REM) A unit that measures radiation in terms of the energy involved (the same
as RAD), weighted by a factor related to the type of radiation. For the
types of radiation used in radiologic procedures this factor is equal to
one, so the REM is equivalent to the RAD.
RSNA Radiological Society of North America.
Scan Term used to describe the computerized images (pictures) generated by
CT, MRI, ultrasound, and nuclear medicine studies. These might be
referred to as a CT scan, MR scan, thyroid scan, bone scan, and so on.
SCR Silicon Controlled Relay.
SCSI Small Computer System Interface.
Secondary Factors Factors that describe the quality of a finished radiograph – density,
contrast, detail, and distortion.
Sharpness The ability of the imaging system to record sharply defined margins, or
abrupt edges. An unsharp edge may be easily seen if contrast is high, but
a sharp edge may be poorly visible if contrast is low.
Shonin Name of the clearance needed to sell in Japan.
SID Source to Image Distance.
Signal-to-Noise Ratio
(S/N Ratio) The ratio of the peak amplitude of the signal to the rms value of the
noise.
Softcopy The image output when displayed on monitors or workstations.
Soft Tissue Radiographic technique that demonstrates anatomical details of soft
tissue.
Solaris Sun Microsystems’ commercial version of the UNIX operating system.
Source to Image Distance
(SID) The distance from the source of the X-rays to the detector.
Spatial Resolution Property of distinguishing two equal sized adjacent objects in the same
place. Refers to the number of pixels in a specified area.