Mitsubishi Electric's Particle Beam Treatment System accelerates hydrogen or carbon ions up to 200,000 kilometers per second (approximately 70% the speed of light) via the main accelerator, and irradiates the tumor through the treatment delivery system. The acceleration of ions creates a particle beam with high kinetic energy, and particle beam therapy takes full advantage of this phenomenon by adjusting the location of the Bragg peak to the tumor site, thus concentrating the radiation on the tumor rather than close to the body's surface.
Mitsubishi Electric has 40 years of experience and know-how in the fields of radiation therapy and accelerator systems. We combined these two fields of technology to develop our particle beam treatment systems, and in 2002 the proton type was granted certification as an authorized medical device. In 2005, the carbon and proton type that allows the use of carbon ion particle beams became the first such device in the world to be granted official certification as a medical device.
Main Specifications
| Proton Type | Carbon and Proton Type | |||
|---|---|---|---|---|
| Particle Type | Proton | Carbon ion | Proton | |
| Energy | 70 - 250 MeV | 70 - 380 MeV / u | 70 - 250 MeV / u | |
| Accelerator Type | Synchrotron | Synchrotron | ||
| Dose Rate | 2.0 Gy / min. or greater | 2.0 Gy / min. or greater | ||
| Treatment Room Configuration | Max. 6 rooms | Max. 6 rooms | ||
| Type of Beam Line | (1) Fixed-angle treatment room | (2) Fixed-angle treatment room | ||
| (available in horizontal, 45-degree or vertical) | (available in horizontal, 45-degree or vertical) | |||
| (2) Rotating gantry treatment room | (2) Rotating gantry treatment room | |||
| Treatment Field Size (Region of dose uniformity within ±2.5%) |
(1) Fixed field treatment room (large field) | (1) Fixed field treatment room (large field) | ||
| Max. 15 cm x 15 cm | Max. 15 cm x 15 cm | |||
| (2) Fixed field treatment room (small field) | (2) Fixed field treatment room (small field) | |||
| Max. Φ10 cm | Max. Φ10 cm | |||
| (3) Rotating gantry treatment room | (3) Rotating gantry treatment room | |||
| Max. Φ20 cm | Max. Φ20 cm | |||
| Field Enlargement Method | Wobbler method | Wobbler method | ||
| SOBP | Device | Ridge filter | Ridge filter | |
| Range Adjustment | Device | Range shifter | Range shifter | |
| Adjustment Range | 0.5 - 127.5 mm (0.5 mm pitch) | 0.5 - 127.5 mm (0.5 mm pitch) | ||
| Patient Positioning | Device | Laser pointer (for rough positioining) | Laser pointer (for rough positioining) | |
| + X-ray (for precision positioning) | + X-ray (for precision positioning) | |||
| Accuracy | Within 2 mm | Within 2 mm | ||
Note: SOBP (Spread-Out Bragg Peak): Bragg peak is spread out to extend the region of high dose
Peripheral Device Configuration for Particle Beam Treatment System
