Section 1 Part 10: Auxiliary Systems

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21 Terms

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Auxillary Systems

  1. Modulator cabinet

  2. Vacuum system

  3. Pressure system

  4. Cooling system

  5. Automatic frequency control system (AFC)

  6. Record and Verify System

  7. Beam Stopper

MV
PC
BRA

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  1. Vacuum System

    Purpose:

  1. Keeps electron gun from burning out (like a lightbulb filament exposed to air)

  2. Keeps foreign particles (air) out of the system (otherwise electrons would collide with air and cut down efficiency)

  3. provides low pressure needed for operation of other internal components

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  1. Pressure system purpose

pressurizes waveguide with freon or sulfur hexafluoride (SF6)

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  1. cooling system purpose

  • what water do you need to use

  1. dissipates heat

  2. keeps accelerator and other structures “in tune”

Steam distilled water only

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  1. Automatic Frequency Control System (AFC)

  • continually senses optimum operating frequency of the accelerator to maximize output

  • Keeps klystron/magnetron in tune

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Record and Verify Systems purpose

Provide set-up parameters for tx setup and delivery

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V&R systems typically monitor:

  1. MUs

  2. Gantry Position

  3. Field size

  4. Collimator rotation

  5. Table position

  6. Beam modifiers

  7. TX totals

  8. arc vs fixed beam settings

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R&V systems are highly recommended for:

  • 3D tx plans

  • other complex setups

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What happens if you set the parameters on the R&V system incorrectly on the first day of treatment?

Errors will continue on subsequent txs

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  1. Beam Stopper

    • purposes

  1. Reduce shielding needs (blocks 99.9% of beam)

  2. Counterbalance to tx head weight

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Beam stopper disadvantages

  1. Hard to work with (if not retractable)

  2. More expensive in the long run: each subsequent linac purchased will need a beam stopper

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PART 2

PART 2

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PSA stand for

Patient Support Assembly

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  • Couch range:

  • How much weight do they support

  • Extended SSD and low couch ranges

  • up to 200kg (450lbs)

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Console contains:

  • VTD: Video Terminal Display

  • Interlocks

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Interlocks used to be called:

faults

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term. Interlocks

Designed to protect patients, staff and equipment

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Common Patient Safety interlocks:

  1. Beam Energy

  2. Beam Symmetry

  3. Dose

  4. Dose Rate

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Machine Protection Interlocks

  1. HVPS

  2. Water Cooling

  3. Vacuum

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Emergency OFF buttons

Cut all power to the machine

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Main Circuit Breaker

  • location

  • what does it do

  • within 10ft of console

  • cuts all power to the whole tx room