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Highest accuracy and speed for daily machine QA and commissioning
The finest resolution for spot characterization and Machine QA
Daily machine parameter verification used from commissioning to machine QA, without compromise between high accuracy and speed
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 in 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 set up. It can be operated on the treatment couch. Data is transferred to a PC via Ethernet (the previous version use Firewire).
Lynx is supported by the following software solutions:
The Lynx detector is characterized by IBA Dosimetry Lab and Fimel. Different corrections have to be applied to the response of the Lynx detector:
Both corrections are determined using a full iris aperture (i.e. 100%). If the detector is not used with a full iris aperture, a correction must be applied. This iris aperture correction (*.dia file) is determined between a full iris aperture (100%) and an iris aperture of 40%.
Beside these corrections, before each detector irradiation session, a background correction is automatically measured to remove both thermal and electronic noise of the camera from the following acquisitions.
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.
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