Users Manual Part 7

Clinical User’s Guide IBA | H-19|
Volume 1 - Treatment Session
Glossary of Terms |
Variable Collimator (VC)
One of the BMDs located inside the nozzle downstream from the retractable X-ray
tube. The VC provides the ability to limit the transversal size of the proton beam by
using a pair of symmetric jaws in the X direction and another pair of symmetric jaws
in Y direction. The jaws are used to circumscribe the beam field in order to limit the
neutron field received by a patient. See also: Nozzle, Gantry, Range Verifier.
Variable Collimator Electronic Unit (VCEU)
Located on the rotating catwalk of the gantry. An electronic device that interfaces
with a variable collimator. See also: Electronic Unit.
VersaModule Eurocard (VME)
(for example, VMEbus cards or VME cards).
A VersaModule Eurocard is a bus or computer data path device that can be integrated
into different hardware systems.
Vertical Steering Magnet
A small, separate dipole magnet deflecting the beam in the vertical plane providing
minor trajectory adjustment. The amplitude of deflection is relatively small compared
to a full-sized dipole magnet. See also: Horizontal Steering Magnet, Trim Coil.
Volt (V)
The standard unit of potential difference and electromotive force in the International
System of Units (SI).
Voltage Gain
Ratio of voltage across a specified load.
Voltage Regulation (Vreg)
Voltage regulation is achieved when the output voltage reaches a stable value
determined from input and feedback parameters.
Watt (W)
A unit of electrical energy equal to 1 joule per second.
X-ray (XR)
Radiation of extremely short wavelength. Typically between 0.1nm and 1nm.
X-ray Electronic Unit (XREU)
Located on the rotating catwalk of the gantry. An electronic device that interfaces
with the motion actuator of an x-ray tube. See also: Electronic Unit.