First DQE measurment of 500 µm thick Si hybrid pixel sensor with Photon counting readout for X-ray medical imaging M.Caria, J.Chaput, L.Sarry, B.Surre.

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Presentation transcript:

First DQE measurment of 500 µm thick Si hybrid pixel sensor with Photon counting readout for X-ray medical imaging M.Caria, J.Chaput, L.Sarry, B.Surre IWORID Glasgow

IWORID B.SURRE2 Introduction Aim: to measure system DQE following a standart protocole Requirements: –IEC –RQA 5 (~ 70 kVp) –Flat field corrected data

IWORID B.SURRE3 Establishment of Standard X-ray spectrum Adjust kVp of generator to get RQA 5 spectrum such as: Spectrum Added filtration (mm Al) HVL (mm Al) RQA 3107 RQA RQA RQA

IWORID B.SURRE4 Measurement geometry

IWORID B.SURRE5 Tube RQA 5

IWORID B.SURRE6 Set up ? Well known Photon counting chip = MEDIPIX 2 (chip set just above the noise) Bump bonded with 500 µm thick Si detector MUROS 2 interface Medisoft Thanks to the MEDIPIX collaboration

IWORID B.SURRE7 Depletion voltage 20 % overdepletion  120 V

IWORID B.SURRE8 Conversion function Pixel size 55x55 µm² Fluence: 91 #/(pixel.µGy) Slope: 5.9 count/(pixel.µGy) G=6.5%

IWORID B.SURRE9 MTF (ESF) N = 1/tan( α ) = 12 Oversampling = mm/12 Angle α

IWORID B.SURRE10 SNR ? 20 flood images to compute the flat field coefficients

IWORID B.SURRE11 ESF, RQA 5, 10 mAs

IWORID B.SURRE12 7. Step (300 pts), RQA 5, 10 mAs Step(x)=ESF(x-x_shift)-ESF(x)

IWORID B.SURRE13 DFT(Step) (300 pts), RQA 5, 10 mAs MTF(f)=|DFT(real step,f)|/|DFT(perfect step,f)|

IWORID B.SURRE14 DFT(Step) (300 pts), RQA 5, 10 mAs MTF(f)=|DFT(real step,f)|/|DFT(perfect step,f)|

IWORID B.SURRE15 DFT(Step) (300 pts), RQA 5, 10 mAs MTF(f)=|DFT(real step,f)|/|DFT(perfect step,f)|

IWORID B.SURRE16 MTF, RQA 5, 10 mAs

IWORID B.SURRE17 MTF, RQA 5, 10 mAs

IWORID B.SURRE18 MTF, RQA 5, 10 mAs Presampling resolution: 7.7 lp/mm Visible detail limit = 0.3

IWORID B.SURRE19 RQA 5 dose

IWORID B.SURRE20 RQA 5

IWORID B.SURRE21 RQA 5 DQE(f) = GxMTF²/NTF²

IWORID B.SURRE22 NPS considerations & calculation Can we consider our results correct? >>> Calculations and simulations…

IWORID B.SURRE23 Experimental NPS dose

IWORID B.SURRE24 Simulated NPS dose

IWORID B.SURRE25 NPS comparison: sim & exp

IWORID B.SURRE26 1-D NPS comparison, 2 directions

IWORID B.SURRE27 1-D NPS comparison

IWORID B.SURRE28 1-D NPS comparison Interpolation increases the low frequencies

IWORID B.SURRE29 Conlusions DQE has been calculated on 500 µm thick Si, bonded to a MEDIPIX2 chip A standard measure protocol have been used DQE is not so evident to find… How to improve this DQE ? (remember medicine) Next step: comparison with detectors of different thickness, study in parallel with detectors from the market, further calculations…

IWORID B.SURRE30 Acknowledgements The MEDIPIX collaboration J.CHAPUT, M.CARIA L.SARRY You, for your attention