Pencil-beam scanning
Pencil beam scanning is the practice of steering a beam of radiation or charged particles across an object. It is often used in proton therapy, to reduce unnecessary radiation exposure to surrounding non-cancerous cells.
Ionizing radiation
[edit | edit source]Ionizing radiation photons or x-rays (IMRT) use pencil beam scanning to precisely target a tumor.[1] Photon pencil beam scans are defined as crossing of two beams to a fine point.
Charged particles
[edit | edit source]Several charged particles devices used with Proton therapy cancer centers use pencil beam scanning.[2] The newer proton therapy machines use a pencil beam scanning technology.[3] This technique is also called spot scanning.[4] The Paul Scherrer Institute was the developer of spot beam.[5]
Intensity Modulated Proton Therapy
[edit | edit source]Varian's IMPT system uses all pencil-beam controlled protons where the beam intensity can also be controlled at this small level. This can be done by going back and forth over a previously radiated area during the same radiation session.[citation needed]
See also
[edit | edit source]- Pencil (mathematics)
- Pencil (optics)
- Radiation treatment planning
- mean free path
- Monte Carlo method for photon transport
- Hybrid theory for photon transport in tissue
- Diffusion theory
- Monte Carlo method
- Varian Medical Systems
References
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