Users Manual Part 7

Clinical User’s Guide IBA | H-15|
Volume 1 - Treatment Session
Glossary of Terms |
Proton Therapy System (PTS)
The equipment provided by IBA that aligns patients, and produces and delivers
proton beam. This system includes all equipment within the treatment facility, the
Treatment Control System (TRCS), and Therapy Safety System. See also: Treatment
Control System, Therapy Safety System.
Pulse Width Modulation (PWM)
The Accelerator Operator uses Pulse Width Modulation to verify the duty cycle of a
train of pulses.
Quiescence
The operating condition of a circuit when no input signal is being applied to the
circuit.
Radiation Therapy Technologist (RTT)
A clinical worker of the treatment center.
Radio Frequency (RF)
Any frequency between normally audible sound waves and the infrared light portion
of the spectrum, lying between ~10 kilohertz and ~one million (10
6
) megahertz.
Random Access Memory (RAM)
A type of computer memory technology. See also: Programmable ROM, Read-only
Memory.
Range Compensator
A patient-specific item attached to the block when required and used to modify the
beam range as required by the treatment plan for the patient. A block of range
shifting material, shaped on one face (normally the upstream face) in such a way that
the distal end of the proton field in the patient takes the shape of the distal end of
the target volume. . The range compensator is supported and positioned by the PBS
Dedicated snout and is normally located downstream of the block. See also: Nozzle,
Snout.
Range Verifier
Located inside the jaws of the variable collimator (Y-jaws) and inserted into the beam
path when needed. Only used to detect large discrepancies in beam range or range
modulation. See also: Nozzle, Ionization Chamber.
Range Verifier Electronic Unit (RVEU)
Located on the rotating catwalk of the gantry. An electronic device that interfaces
with a range verifier and integrates the current from 29 brass plates of the range
verifier. See also: Electronic Unit.