Users Manual Part 7

Clinical User’s Guide IBA | H-3|
Volume 1 - Treatment Session
Glossary of Terms |
Beam Modifying Device (BMD)
A device placed in or out of the beam in the Energy Selection and Beam Transport
System (ESBTS) and nozzle used to effect, define, or modify beam characteristics.
For the ESBTS, they alter the beam energy and define the beam emittance. They
include the degrader, divergence limiting collimator, diversion limiting slit,
momentum limiting slit, and final collimator.
Beam Profile Monitor (BPM)
A device located along the beam line allowing characterization of the beam without
blocking the beam. Each BPM includes two grids of vertical and horizontal
conductors on which the beam current is measured. See also: Energy Selection and
Beam Transport System.
Block
One of the patient specific BMDs. The block is used to shape the transverse
extension of the proton beam to the shape of the target. Each block is supported and
positioned by a snout. See also: Beam Modifying Device
Cathode
The general name for any negative electrode.
Center of Gravity (CoG)
That point in a body or system around which its weight is evenly distributed or
balanced and may be assumed to act.
Celsius (C), degree
A unit of measure used to indicate temperature.
Central Management Workstation (CMW)
The computer workstation located in the MCR. See also: Main Control Room,
Treatment Room, Treatment Control Room.
Choke
An inductor used to impede the flow of pulsating dc or ac by means of self-
inductance.
Clockwise (CW)
Rotation in the direction in which the hands of a clock move.