Simulator Flashcards
A machine that uses x-ray tube but imitate all of the mechanical, geometrical and optical features of the treatment plan.
Simulator
Purpose of Simulator
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Determining thr extent of the tumor and location of critical organs
Tumor localization
Verifies the accuracy of treatment plan
Treatment verification
2 types of simulator
X-ray simulator
CT simulator
C shaped, structural support the gantry (both x-ray tube and image intensifier)
Gantry Arm
The fixed point in space where the gantry rotates
Isocenter
Location: central point of rotation of the gantry arm used to measure the gantry angle
Protractor
Has a large and small focal spot
X-ray tube
Small focal spot ahould not be greater than
0.6 mm
To obtain a sharp image of the field defining wires
X-ray tube
Similar to digital x-ray. Used for taking portal images
Beam view
Converts x-ray image into light image
Image intensifier
Location: other side of the gantry arm
Image intensifier
A device which a patient is positioned during treatment or simulation
Patient table top
For body alignment
Fiducial plate or Reticle
Plexiglass/plastic tray imbedded with lead markers at regular intervals
Fiducial plate or Reticle
Positioned in the head of the gabtry but the field defining waves and the accessory holding
Fiducial plate or Reticle
Mounted on the collimator/gantry head
Accessory holder
Serves as a block tray holder and an electron cone adapter
Accessory holder
Optical Distance Indicator (ODI) also called as
Rangefinder
Projects a scale onto the px’s skin which corresponds to the SSD. Mounted near the collimator.
Optical Distance Indicator (ODI) also called as
Comprise most of the gantry head
Collimator assembly
Location: collimator assembly
They represent the edge of the treatment field within the larger image that is defined by the beam limiting devices
Field Defining Wars
Made of 2-3mm of lead. Define the size and axis of the beam.
Beam Restricting Diaphragms
