Energy Measurement of X-rays in Computed Tomography for Detecting Contrast Media

Kanno, Ikuo; Uesaka, Akio; Nomiya, Seiichiro; Onabe, Hideaki

doi:10.3327/jnst.45.15

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…The ES CT values from acrylic regions, however, depended on the acrylic thickness through which the x-rays passed. We did not observe this variation in CT values in the acrylic region when the energy of each x-ray was measured using a conventional CdZnTe detector [2].…”

Section: Introductionmentioning

confidence: 60%

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Computed tomography for iodine contrast media detection using energy information measured by a current-mode detector

Kanno¹,

Imamura²,

Mikami³

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

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To exploit the energy information of x-rays in computed tomography (CT), we developed a current-mode detector that gave the energy distribution of the incident x-rays. The CT value obtained for a given material in a phantom depended on the x-ray path length through the phantom. To ensure a constant CT value for a given material, we prepared response functions as a function of the x-rays path length and applied these response functions in the unfolding process. When using response functions that depended on the x-ray path length, the CT values obtained were constant for a given material. In addition, the CT values obtained for iodine contrast media were greater than the values obtained using conventional current CT, especially for higher x-ray tube voltages.

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Section: Introductionmentioning

confidence: 60%

“…As shown in Ref. [2], by exploiting the x-ray events at energies above and below the K-edge of iodine, the absorption effect by iodine is clearly observed, despite the difficulties induced by the x-ray tube voltage and the subject thickness. This method is called energy subtraction (ES) CT.…”

Section: Introductionmentioning

confidence: 81%

Computed tomography for iodine contrast media detection using energy information measured by a current-mode detector

Kanno¹,

Imamura²,

Mikami³

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

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show abstract

“…On the other hand, the CT value in the iodine region differs clearly from the one in the acryl region in the ES measurement. The CT value for the ES method has been shown to be proportional to the iodine thickness [6]. An iodine thickness of 1 µm could be detected with the ES method because the CT value -0.09 0.02 -0.09 0.02 differences between the center and fringe of the iodine region is nearly 0.02 using the ES method whereas it is 0.002 using the current method.…”

Section: Ct Measurementmentioning

confidence: 98%

“…[1] Furthermore, the FIX-ES method was shown to be twice as sensitive to iodine as the current measurement method. [2] Journal logo…”

Section: Introductionmentioning

confidence: 99%

Energy subtraction computed tomography measured by current-mode detector

Kanno

Imamura

Mikami

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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For the reduction of exposure dose in contrast media detection with x-ray transmission measurements, the energy measurement of x-rays and the energy subtraction (ES) method have been shown to be effective. To make the ES method applicable, a novel detector for unfolding the x-ray energy distribution was proposed by the authors. As an application of this novel detector, a CT image was reconstructed with ES data and compared with the image reconstructed using electric current data.

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Simulation Study on Unfolding Methods for Diagnostic X-rays and Mixed Gamma Rays

Hashimoto

Ohtaka

Ara

et al. 2009

Journal of Nuclear Science and Technology

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A photon detector operating in current mode that can sense X-ray energy distribution has been reported. This detector consists of a row of several segment detectors. The energy distribution is derived using an unfolding technique. In this paper, comparisons of the unfolding techniques among error reduction, spectrum surveillance, and neural network methods are discussed through simulation studies on the detection of diagnostic X-rays and gamma rays emitted by a mixture of 137 Cs and 60 Co. For diagnostic X-ray measurement, the spectrum surveillance and neural network methods appeared promising, while the error reduction method yielded poor results. However, in the case of measuring mixtures of gamma rays, the error reduction method was both sufficient and effective.

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Energy Measurement of X-rays in Computed Tomography for Detecting Contrast Media

Cited by 9 publications

References 6 publications

Computed tomography for iodine contrast media detection using energy information measured by a current-mode detector

Computed tomography for iodine contrast media detection using energy information measured by a current-mode detector

Energy subtraction computed tomography measured by current-mode detector

Simulation Study on Unfolding Methods for Diagnostic X-rays and Mixed Gamma Rays

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