Energy subtraction computed tomography measured by current-mode detector

Kanno, Ikuo; Imamura, Rikizo; Mikami, Kenta; Hashimoto, Makoto; Ohtaka, Masahiko; Ara, K.; Nomiya, Seiichiro; Onabe, Hideaki

doi:10.1016/j.nima.2009.05.092

Cited by 4 publications

(3 citation statements)

References 6 publications

(9 reference statements)

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“…4) Although the CT values in the iodine contrast region of the phantom were larger than the ones obtained by a conventional current measurement CT, the CT values in the homogeneous acrylic region were dependent on the thickness of acrylic through which the X-rays passed before interacting with the detector. This defect was the result of an insufficient unfolding method, because the CT values in the acrylic region were constant when the energy of each X-ray was measured as shown in Fig.…”

Section: Introductionmentioning

confidence: 79%

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Unfolding Method with X-ray Path Length-Dependant Response Functions for Computed Tomography Using X-ray Energy Information

Imamura

Mikami

Minami

et al. 2010

Journal of Nuclear Science and Technology

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The computed tomography (CT) values obtained by the energy subtraction method with a transXend detector, which measured X-rays as current and gave the corresponding X-ray energy information, show the disadvantage that the CT values are dependent on the thickness of a homogeneous phantom. In order to obtain constant CT values for a uniform material, a new unfolding method is proposed using variable response functions of the transXend detector according to the X-ray path length in the phantom. The CT values measured using the new unfolding method are discussed with respect to the energy range used in the unfolding process, the number of segment detectors, and the substrate of the segment detectors.

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Section: Introductionmentioning

confidence: 79%

“…4) This indicates that response functions as a function of X-ray path length are necessary for the unfolding process. We describe the method of obtaining response functions as a function of X-ray path length for CT measurements in the following section.…”

Section: Brief Description Of the Transxend Detectormentioning

confidence: 99%

Unfolding Method with X-ray Path Length-Dependant Response Functions for Computed Tomography Using X-ray Energy Information

Imamura

Mikami

Minami

et al. 2010

Journal of Nuclear Science and Technology

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“…Initial studies that compared energy subtraction CT and conventional current measurement CT on a simple phantom, using the transXend detector, have been reported elsewhere. 11) …”

Section: Discussionmentioning

confidence: 99%

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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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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Energy subtraction computed tomography measured by current-mode detector

Cited by 4 publications

References 6 publications

Unfolding Method with X-ray Path Length-Dependant Response Functions for Computed Tomography Using X-ray Energy Information

Unfolding Method with X-ray Path Length-Dependant Response Functions for Computed Tomography Using X-ray Energy Information

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

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

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