Users Manual Part 7

IBA | H-16 | Clinical User’s Guide
Volume 1 - Treatment Session
Glossary of Terms
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Read-only Memory (ROM)
A type of computer memory. See also: Programmable ROM, Random Access
Memory.
Rectifier
A device, which, by its construction characteristics, converts alternating current into
a pulsating direct current.
Regulator
The section in a power supply that maintains the output of the power supply at a
constant level even if experiencing changes in load current or input line voltage.
Revolutions per Minute (rpm)
A metric used to track the number of times per minute an object makes a complete
revolution.
Ripple Frequency
The frequency of the ripple current. In a full-wave rectifier, it is twice the input line
frequency.
Ripple Voltage
The alternating component of unidirectional voltage. The alternating component is
small compared to the direct component.
Safety Redundant Control Unit (SRCU)
There is one SRCU dedicated to the cyclotron, the ESS beam stop, and the CBTV,
and one SRCU for each TR. Controls devices and systems associated with the safety
system. See also: Accelerator Control Unit, Treatment Control Unit.
Saturation
The point in a tube where a further increase in plate voltage no longer produces an
increase in plate current. At this point, the upper limit of the conduction capabilities
of the tube has been reached.
Screen Grid
A grid placed between a control grid and the plate. Usually maintained at a positive
potential.
Segment
A segment is a single patient irradiation, corresponding to a unique equipment
configuration, including a specified dose, which will be delivered generally without
interruption, with no motion of any Patient Positioning Device (PPD).