18
5. Word List
Slit Measurement Using Digital Image
RTI Slit Camera User’s Manual
1.0B
(From the IEC 788 standard)
Reference
direction
”
For a RADIATION SOURCE, specified direction to which
characteristics such as TARGET ANGLE, RADIATION
FIELD, and specifications with respect to the imaging
quality of the RADIATION SOURCE, are referenced.”
(From the IEC 788 standard)
Reference plane
”
In diagnostic X-ray equipment for an EFFECTIVE FOCAL
SPOT,
plane
perpendicular
to
the
REFERENCE
DIRECTION
containing
the
point
at
which
the
REFERENCE AXIS intersects with the ACTUAL FOCAL
SPOT.
By convention, the point of intersection forms the center of
the EFFECTIVE FOCAL SPOT.”
(From the IEC 788 standard)
RMS
Root Mean Square, a proposed new method of focal spot
,
(From the IEC 788 standard)
Slit
Narrow but long opening between two solid materials. In
this case the slit is 10 µm wide and 5 mm long. The
material is Tantalum. These specifications comply with the
IEC 60336 standard.
Width
For measurements over the width of the FOCAL SPOT,
the direction of evaluation shall be, in general, normal to
the direction for LENGTH.
(Free from the IEC 60336
standard)
The width is normally perpendicular to the perpendicular
projection of the anode cathode axis on the REFERENCE
PLANE.