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FLASH-RT has proven beneficial in preclinical studies. However, the lack ofaccurate real time 2D dosimetry is a limiting factor. In this work, aninnovative solution for 2D real time dosimetry in UHDR electron beams ispresented. The in-house developed ImageDosis system consists of a scientificcamera, with high temporal resolution, and a coating, containing 12% ofY$_3$Al$_5$O$_{12}$:Ce$^{3+}$ as scintillating material. Reference dosimetrywas performed by means of radiochromic film, and a(C$_{38}$H$_{34}$P$_2$)MnBr$_4$ point scintillator was used to validate thepulse discrimination properties of the ImageDosis system. Irradiations wereperformed in two centers (Antwerp and Orsay), with an ElectronFlashaccelerator, with varying number of pulses, pulse length, pulse repetitionfrequency (PRF) and energy. Also, the temporal resolution and 2D propertieswere investigated. For doses > 3.5 Gy, the ImageDosis showed a linear doseresponse up to at least 13 Gy. No dose rate dependence was found for an averagedose rate up to 140 Gy/s, a dose per pulse up to 2 Gy and a PRF up to 300 Hz.The ImageDosis system showed capable of measuring the dose of the individualpulses up to a PRF of 250 Hz, but did not detect 3% of the pulses, becausethese pulses were delivered during the dead time of the camera. The maximaldifference in FWHM of the field size between the ImageDosis system and thereference was 3.6%. For a nominal field size of 100 mm and 120 mm, a decreasedoutput was observed on the superior part of the field. The ImageDosis systemshowed linear dose response and no dose rate nor energy dependence. It showedcapable of discriminating and measuring the dose of individual pulses andpromising 2D characteristics that need further optimization.

An innovative dose rate independent 2D Ce-doped YAG scintillating  dosimetry system for time resolved beam monitoring in ultra-high dose rate  electron FLASH radiation therapy