SNR performance comparison of dual-layer detector and dual-kVp spectral CT

Heismann, Björn J.; Wirth, Stéfan

doi:10.1109/nssmic.2007.4436953

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…Fast kV switching allows the energy to be changed for each adjacent projection which approximates simultaneous acquisition and has the potential for plaque characterization 50. A spectrally sensitive detector, such as a sandwich detector, uses distinct detector materials 51 to separate different energy levels from each layer 52. This gives simultaneous acquisition of each projection, but is challenged by poor energy discrimination.…”

Section: Image Acquisitionmentioning

confidence: 99%

CT Angiography: Current Technology and Clinical Use

Kumamaru

Hoppel

Mather

et al. 2010

Radiologic Clinics of North America

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Section: Image Acquisitionmentioning

confidence: 99%

CT Angiography: Current Technology and Clinical Use

Kumamaru

Hoppel

Mather

et al. 2010

Radiologic Clinics of North America

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“…When we normalize both detected spectra to 1, we obtain the system weighting functions of the two energy bins. The overlap reaches around 60% and is thus comparably larger than the 40 to 50% overlap of dual kVp or dual-source CT, [24]. This indicates that the dual-energy measurement capabilities of direct conversion detectors are significantly affected by low energy shift mechanisms in the Detector Response Function.…”

Section: Resultsmentioning

confidence: 95%

Spectral and spatial resolution of semiconductor detectors in medical X- and gamma ray imaging

Heismann

Henseler

Niederloehner

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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Abstract-In X-and gamma ray based medical systems, detector performance is a key driver for diagnostic quality. Over the last years and decades, indirect conversion scintillator detectors have become the standard for many medical applications including X-ray Radiography, Computed Tomography and SPECT. Recently, direct conversion semiconductor detectors based on CdTe and CdZnTe (CZT) have come into focus, as they might offer improved or additional performance for specific applications. In this paper we use generic physical models to compare the spatial and spectral resolution of both detector types. The spatial resolution is quantified by the Modulation Transfer Function (MTF). We find that the direct conversion of quanta leads to an approximately sinc-like MTF. In comparison, the MTF of a pixelized scintillator detector shows a mid-frequency drop due to optical signal cross-talk.The spectral resolution of both detector types is described by the Detector Response Function (DRF). It yields the probability density D(E, E ) to measure an incoming quantum of energy E as the output energy E . As a general result we find that fluorescence X-ray cross-talk on one hand and charge sharing and optical cross-talk on the other hand significantly influence the DRF in both detector types. We compare the two detector types in a Computed Tomography application. For an integrating scintillator detector, a Poisson excess noise is observed and quantified. For a counting semiconductor detector, we describe the signficant low-energy shift in D(E, E ). The weighting functions of a two bin counting detctor are analyzed and compared to tube-based approaches. The results are summarized to show the trade-off between spectral and spatial resolution in medical imaging with direct conversion detectors.

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“…Dual Source CT (DSCT) [13]. The kVp switching mechanism is generally a better method than the sandwich detector mechanism for dual energy CT applications, particularly from SNR perspective [14]. Figure 3 shows an example of dual .…”

Section: Dual Energy Ctmentioning

confidence: 99%

Dual Energy Computed Tomography for Checked Baggage Screening

Ying

Naidu

2009

Handbook of Pattern Recognition and Computer Vision

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Over the past decades, Computed Tomography (CT) theories, technologies, and applications have undergone rapid development and deployment. Although CT was developed as an imaging technique primarily for medical diagnosis, its applications in areas outside the medical field have gained increasing attention. In particular, CT combined with pattern recognition techniques has been used in Explosives Detection Systems (EDS) for Automated Threat Detection (ATD) in checked baggage screening. In this chapter, we describe dual energy x-ray CT technologies and associated ATD techniques used for checked baggage screening at airports.

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SNR performance comparison of dual-layer detector and dual-kVp spectral CT

Cited by 5 publications

References 8 publications

CT Angiography: Current Technology and Clinical Use

CT Angiography: Current Technology and Clinical Use

Spectral and spatial resolution of semiconductor detectors in medical X- and gamma ray imaging

Dual Energy Computed Tomography for Checked Baggage Screening

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