Abstract
The spatial frequency dependent detective quantum efficiency (DQE) of a CsI-CMOS x-ray detector was measured in two operating modes: a high dynamic range (HDR) mode and a high sensitivity (HS) mode. DQE calculations were performed using the IEC-62220-1-2 Standard. For detector entrance air kerma values between ~7 μGy and 60 μGy the DQE is similar in either HDR mode or HS mode, with a value of ~0.7 at low frequency and ~ 0.15 – 0.20 at the Nyquist frequency fN = 6.7 mm− 1. In HDR mode the DQE remains virtually constant for operation with Ka values between ~7 μGy and 119 μGy but decreases for Ka levels below ~ 7 μGy. In HS mode the DQE is approximately constant over the full range of entrance air kerma tested between 1.7 μGy and 60 μGy but kerma values above ~75 μGy produce hard saturation. Quantum limited operation in HS mode for entrance kerma as small as 1.7 μGy makes it possible to use a large number of low dose views to improve angular sampling and decrease acquisition time.
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References
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© 2012 Springer-Verlag Berlin Heidelberg
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Patel, T., Klanian, K., Gong, Z., Williams, M.B. (2012). Detective Quantum Efficiency of a CsI-CMOS X-ray Detector for Breast Tomosynthesis Operating in High Dynamic Range and High Sensitivity Modes. In: Maidment, A.D.A., Bakic, P.R., Gavenonis, S. (eds) Breast Imaging. IWDM 2012. Lecture Notes in Computer Science, vol 7361. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31271-7_11
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DOI: https://doi.org/10.1007/978-3-642-31271-7_11
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-31270-0
Online ISBN: 978-3-642-31271-7
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