Pencil-beam scanning

It is often used in proton therapy, to reduce unnecessary radiation exposure to surrounding non-cancerous cells.

Ionizing radiation photons or x-rays (IMRT) use pencil beam scanning to precisely target a tumor.

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.

[4] The Paul Scherrer Institute was the developer of spot beam.