High accuracy and speed for daily machine parameter verification Daily machine parameter verification used from commissioning to machine QA, without compromising between high accuracy and speed.
Compatible with: Carbon Compatible, Cyclotrons, Synchro-Cyclotron, Proton Therapy, TG224
Used for: Commissioning PT, Annual QA PT, Monthly QA PT
What you need to know about Lynx PT
Technology
The Lynx detector consists of a box composed by a scintillating screen of gadolinium-based plastic material which converts the energy lost by ionizing radiation into photons. This light is reflected to photodiodes of a CCD camera outside the irradiation field. To avoid the saturation of the camera, iris aperture can be changed, as well as the gain. The detector signal from the CCD camera is digitalized at a 10-bit depth.
The Lynx detector is easy to setup. It can be operated on the treatment couch. Data is transferred to a PC via Ethernet (previous version used Firewire).
Lynx is supported by the following software solutions:
- Lynx2D
- myQA Lynx plug-in
Technical specifications
- Scintillation screen thickness: 0.4 mm
- Energy range: 60Co at 25 MV in photons /4 to 25 MeV in electrons/ 230 MeV Protons
- Active surface area: 300 x 300 mm² (600 x 600 pixels)
- Pixel size: 4.65 x 4.65 um²
- Effective spacial resolution: 0.5 mm
- Geometric distortion: ≤ 0.3 mm for the central zone of ≤ 280 x 280 mm²; ≤ 0.8 mm elsewhere
- Image acquisition: CCD camera
- Video camera: 1024 x 1024, 12-bit resolution
- Sampling time: 7 images / secondes
- Dose linearity within +/- 1.5%
- Spot sigma: Variation < 100 um
- Dimensions: 360 x 370 x 600 mm
Accessories
- Calibration plate for Lynx PDR1602
Sphinx with Lynx Publication
Placidi et.al. “ Range Resolution and Reproducibility of a Dedicated Phantom for Proton PBS Daily Quality Assurance .” Zeitschrift Für Medizinische Physik 28, no. 4 (December 1, 2018): 310–17.
Conclusion The proposed combination of the Lynx ® + Sphinx ® systems appear to be suitable as a device for daily QA of proton range for PBS proton therapy, even under extreme, and very unlikely, set-up and beam delivery uncertainties.
