Users Manual Part 7

Clinical User’s Guide IBA | H-17|
Volume 1 - Treatment Session
Glossary of Terms |
Setpoint (SP)
Value entered on UI screens of the TRCS. The entered value correlates to a voltage,
current, or distance. See also: Treatment Control System.
Solid State Amplifier (SSA)
Located in the Power Supply Room (PSR) downstream from the low-level RF 1W
amplifier. The pre-driver amplifier that is part of the RF system. See also: Accelerator,
Low-level RF, Final Power Amplifier, Intermediate Power Amplifier.
Space Charge
An electrical charge distributed throughout a volume or space.
Spread-out Bragg Peak (SOBP)
Indicates the area where the radiation dose is delivered to a target.
Table Top Coordinate System (TTCS)
One of the coordinate systems supported by the Treatment Control System (TRCS).
See also: Treatment Control System, Coordinate System.
Te t r o d e Tu b e
A four-electrode electron tube containing a plate, cathode, control grid, and screen
grid.
Therapy Safety System (TSS)
Ensures the safety of any people (patients and/or facility personnel) by monitoring all
facility equipment (for example, proton beam, etc.) that may cause injury to any
people (patients and/or facility personnel) and has the primary function of preventing
injury to any people (patients and/or facility personnel). See also: Treatment Control
System.
Thermionic Emission
Emission of electrons from a solid body as a result of elevated temperature.
Transconductance
A measure of the change in plate current to a change in grid voltage with the plate
voltage held constant. Transconductance (gm) is usually expressed in microhms or
milliohms.
Mathematically, gm =
g
p
E
I