Optimization of Medipix-2 threshold masks for spectroscopic X-ray imaging

Procz, S.; Lubke, J.; Mix, Michael; Fiederle, M.

doi:10.1109/nssmic.2008.4775176

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…It also illustrates that the same improvements of the CZT detector spectral response can be achieved with the position sensitive (pixel) detectors. By reading signals from several adjacent pixels and from the cathode, it is possible to locate origins of the electron clouds within areas of ~100x100 µm 2 or smaller (depending on a pixel size) in x-y directions and ~500 µm in the z direction [12,13]. This allows one to calibrate and correct the response from each voxel of the CZT crystal including the deviations caused by Te inclusions.…”

Section: E Correcting Small-scale Variations Caused By Te Inclusionsmentioning

confidence: 99%

Te Inclusions in CZT Detectors: New Method for Correcting Their Adverse Effects

Bolotnikov

Babalola

Camarda

et al. 2010

IEEE Trans. Nucl. Sci.

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Abstract-Both Te inclusions and point defects can trap the charge carriers generated by ionizing particles in CdZnTe (CZT) detectors. The amount of charge trapped by point defects is proportional to the carriers' drift time and can be corrected electronically. In the case of Te inclusions, the charge loss depends upon their random locations with respect to the electron cloud. Consequently, inclusions introduce fluctuations in the charge signals, which cannot be easily corrected. In this paper, we describe direct measurements of the cumulative effect of Te inclusions and its influence on the response of CZT detectors of different thicknesses and different sizes and concentrations of Te inclusions. We also discuss a means of partially correcting their adverse effects.

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Section: E Correcting Small-scale Variations Caused By Te Inclusionsmentioning

confidence: 99%

Te Inclusions in CZT Detectors: New Method for Correcting Their Adverse Effects

Bolotnikov

Babalola

Camarda

et al. 2010

IEEE Trans. Nucl. Sci.

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“…The output of the Charge Sensitive Amplifier (CSA) in the pixel electronics reflects the movement of charge carriers in the sensor due to the bias voltage. The detectors were equalized by count rate equalization [30], which is a good compromise between equalization effort and spectral uniformity. It gives a better result than standard equalization with the electronics noise floor.…”

Section: A Detectors and Sensorsmentioning

confidence: 99%

“…use of the K α fluorescence of different metals [30]. The low threshold (E min ) of all Medipix3RX and Timepix1 detectors was set to the same value of 5.0 ± 0.2 keV for all contrast and dose measurements.…”

Section: A Detectors and Sensorsmentioning

confidence: 99%

Investigation of CdTe, GaAs, Se and Si as Sensor Materials for Mammography

Procz

Roque

Ávila

et al. 2020

IEEE Trans. Med. Imaging

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Despite the benefits of mammography investigations, some studies have shown that X-ray exposure from the mammography screening itself can statistically cause breast cancer in a small fraction of women. Therefore, a dose reduction in mammography is desirable. At the same time, there is a demand for a higher spatial resolution in mammographic imaging. The most promising way to achieve these goals is the use of advanced photonprocessing semiconductor X-ray detectors with optimum sensor materials. This study addresses the investigation of the optimum semiconductor sensor material for mammography in combination with the photon-processing detector Medipix3RX. The influence of K-shell fluorescence from the sensor material on the achievable contrast-to-noise ratio is investigated, as well as the attenuation efficiency. The three different sensor materials, CdTe, GaAs, and Si are studied, showing advances of CdTe-sensors for mammography. Furthermore, a comparison of the contrast-to-noise ratio between a clinical Se-detector and Medipix3RX detectors with Si-and CdTe-sensors is shown using a self-produced mammography phantom that is based on real human tissue.

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“…XRF is the third option for detector energy response calibration based on mono-energetic spectrum. In order to produce mono-energetic fluorescent X-rays, a fluorescent target with high atomic number (Z) is illuminated by high energy X-rays or gamma-rays from either radioactive isotopes [51, 53, 62] or laboratory X-ray sources [33, 63–66]. When the energy of the incident photons exceeds the binding energy (e.g.…”

Section: Photon Counting Detector Characterizationmentioning

confidence: 99%