Energy weighting technique in Quantum Computed Tomography using a MPGD

Carramate, L. F. N. D.; Oliveira, C.; Silva, A L M; Silva, A M da; Santos, J.M.F. dos; Veloso, J.F.C.A.

doi:10.1088/1748-0221/6/02/c02002

Cited by 13 publications

(20 citation statements)

References 10 publications

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“…It is the basis for methods like the Energy Weighting Technique (EWT) [3] and the Basis Material Decomposition (BMD) [4,5]. Different types of detectors have this capability, as for example the Medipix2 [6] and the MicroHole & Strip Plate (MHSP) [7,8]. The Medipix2 is a pixelated single photon counting solid state detector that comprises an adjustable energy threshold.…”

Section: Jinst 8 C03022mentioning

confidence: 99%

“…These detectors allow energy selective (or even material selective) imaging that gives the possibility to enhance structures inside the object depending on their attenuation coefficients [7,9].…”

Section: Jinst 8 C03022mentioning

confidence: 99%

“…To perform the energy weighting technique, the number of events of each energy channel, S i , is multiplied by a factor, called the weighting factor, w i . The weighted sum of the contribution of each channel of the spectrum gives the intensity of a picture element (pixel) of the projection matrix, S, according to [3,7]:…”

Section: Energy Weighting Techniquementioning

confidence: 99%

See 2 more Smart Citations

Energy resolving CT systems using Medipix2 and MHSP detectors

Carramate

Nachtrab

Firsching³

et al. 2013

J. Inst.

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Energy resolved imaging has been possible with a newest generation of radiation detectors with photon counting and spectroscopic capabilities. This innovation gives the possibility to enhance the image quality by applying techniques using the energy information. In this work two X-ray Computed Tomography (CT) Systems were assembled with two different energy resolving detectors: Medipix2 and MicroHole & Strip Plate (MHSP). These detectors have the aforesaid characteristics and showed a good performance for X-ray imaging. The Energy Weighting Technique (EWT) and Basis Material Decomposition (BMD) techniques were applied with good results. An improvement of 31% in the CNR was achieved by applying the EWT in the MHSP data and, using Medipix2, two basis materials (Carbon based and Aluminium) were decomposed successfully with densities close to the real values.

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Section: Jinst 8 C03022mentioning

confidence: 99%

Section: Jinst 8 C03022mentioning

confidence: 99%

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Energy resolving CT systems using Medipix2 and MHSP detectors

Carramate

Nachtrab

Firsching³

et al. 2013

J. Inst.

Self Cite

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“…Moreover, a fine time evolution of the energy spectrum and counting rates should be provided to analyze variable or transient radiation. Multi-parameter analysis performed at very high fluence rates (410 6 photons mm À 2 s À 1 ) can be very helpful in the development of advanced energy resolved photon counting detectors, recently proposed in diagnostic medicine (computed tomography and mammography), industrial imaging and security screening [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A digital approach for real time high-rate high-resolution radiation measurements

Gerardi

Abbene

2014

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tModern spectrometers are currently developed by using digital pulse processing (DPP) systems, showing several advantages over traditional analog electronics. The aim of this work is to present digital strategies, in a time domain, for the development of real time high-rate high-resolution spectrometers. We propose a digital method, based on the single delay line (SDL) shaping technique, able to perform multi-parameter analysis with high performance even at high photon counting rates. A robust pulse shape and height analysis (PSHA), applied on single isolated time windows of the detector output waveforms, is presented.The potentialities of the proposed strategy are highlighted through both theoretical and experimental approaches. To strengthen our approach, the implementation of the method on a real-time system together with some experimental results are presented. X-ray spectra measurements with a semiconductor detector are performed both at low and high photon counting rates (up to 1.1 Mcps).

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“…Due to the increasing X-ray and gamma ray applications like synchrotron light experiments [1,2], non-destructive X-ray inspection of objects [3] and the new energy-selective imaging techniques in diagnostic X-ray medicine (mammography, computed tomography) [4,5], new spectroscopic systems with high-rate-resolution capabilities are required. Concerning the medical applications, typical diagnostic X-ray beams are characterized by photon fluence rates higher than 10 6 photons mm −2 s −1 and, in this hard environment, the development of high performance systems is still a great challenge.…”

Section: Introductionmentioning

confidence: 99%

Energy resolution and throughput of a new real time digital pulse processing system for x-ray and gamma ray semiconductor detectors

Abbene¹,

Gerardi²,

Raso³

et al. 2013

J. Inst.

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New generation spectroscopy systems have advanced towards digital pulse processing (DPP) approaches. DPP systems, based on direct digitizing and processing of detector signals, have recently been favoured over analog pulse processing electronics, ensuring higher flexibility, stability, lower dead time, higher throughput and better spectroscopic performance. In this work, we present the performance of a new real time DPP system for X-ray and gamma ray semiconductor detectors. The system is based on a commercial digitizer equipped with a custom DPP firmware, developed by our group, for on-line pulse shape and height analysis. X-ray and gamma ray spectra measurements with cadmium telluride (CdTe) and germanium (Ge) detectors, coupled to resistivefeedback preamplifiers, highlight the excellent performance of the system both at low and high rate environments (up to 800 kcps). A comparison with a conventional analog electronics showed the better high-rate capabilities of the digital approach, in terms of energy resolution and throughput. These results make the proposed DPP system a very attractive tool for both laboratory research and for the development of advanced detection systems for high-rate-resolution spectroscopic imaging, recently proposed in diagnostic medicine, industrial imaging and security screening.

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Energy weighting technique in Quantum Computed Tomography using a MPGD

Cited by 13 publications

References 10 publications

Energy resolving CT systems using Medipix2 and MHSP detectors

Energy resolving CT systems using Medipix2 and MHSP detectors

A digital approach for real time high-rate high-resolution radiation measurements

Energy resolution and throughput of a new real time digital pulse processing system for x-ray and gamma ray semiconductor detectors

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