A Current-Mode Detector for Unfolding X-ray Energy Distribution

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

doi:10.3327/jnst.45.1165

Cited by 15 publications

(29 citation statements)

References 6 publications

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“…As described in the previous paper, RF measurement for the phantom material was necessary prior to CT measurement [7]. Used materials for RF measurement were the same ones with the phantom for CT measurement: slabs of different thicknesses were prepared for each material in the phantom.…”

Section: Methodsmentioning

confidence: 99%

“…In previous studies [7] [8], the RF was estimated by using the same material with the one of phantom for CT measurement. In this study, we demonstrated two different analysis scenarios.…”

Section: Methodsmentioning

confidence: 99%

“…When the transXend detector is used for X-ray transmission measurement, the relationship between the measured electric currents and the X-ray energy distribution is expressed in terms of following matrix equation [7]:…”

Section: The Relationship Between the Measured Currents And X-ray Enementioning

confidence: 99%

“…To overcome the problems associated with photon-counting CT and dualenergy CT, we have proposed a novel energy-resolved CT by using a transXend detector [7]. The schematic drawing of the transXend detector is shown in Figure 1 of [7].…”

Section: Introductionmentioning

confidence: 99%

“…The schematic drawing of the transXend detector is shown in Figure 1 of [7]. The transXend detector consists of several segmented detectors aligned in the X-ray incident direction and measures X-rays as electric currents.…”

Section: Introductionmentioning

confidence: 99%

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Effective Atomic Number Measurement with Energy-Resolved Computed Tomography Using Two-Dimensional “transXend” Detector

Iramina¹,

Nakamura²,

Mizowaki³

et al. 2018

IJMPCERO

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Introduction: We have previously developed an effective atomic number (Z eff ) measurement method using linear attenuation coefficients (LACs) obtained by energy-resolved computed tomography (CT) with one-dimensional (1D) detector. The energy-resolved CT was performed with a "transXend" detector, which measured X-rays as electric current and then gave X-ray energy distribution with unfolding analysis using pre-estimated response function (RF). The purpose of this study is to measure Z eff by the energy-resolved CT using a flat panel detector (FPD). Methods: To demonstrate a 2D transXend detector, we developed the stripe absorbers for the FPD. Eleven human tissue-equivalent material rods which were grouped into four material categories were measured by X-rays with 120 kVp tube voltage, 2.3 mA tube current, and 1.0 s exposure time. Z eff is measured by the ratio of LACs with two different pseudo-monochromatic X-ray energies. RFs of each rod material were estimated by numerical calculation. First, we employed the RF estimated for the same rod material (self-RF scenario). Second, we employed the RF estimated for the different rod materials in the same material category (cross-RF scenario). The purpose of the cross-RF scenario was to find representative rod materials in each material category. Results: Upon the self-RF scenario, measured Z eff s were systematically underestimated. Median relative error to theoretical Z eff was −6.92% (range: −7.89% -−4.60%). After normalizing measured Z eff s to the theoretical one for Breast, median relative error improved to −0.75% (range: −1.79% -+1.73%). Upon the cross-RF scenario, the representative rod materials were found in two material categories. Conclusion: Z eff measurements were performed by energy-resolved CT using 2D transXend detector with numerically-estimated RF data. Normalized Z eff s for How to cite this paper: Iramina, H., Nakamura, M., Mizowaki, T. and Kanno, I.

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Section: Methodsmentioning

confidence: 99%

“…In previous studies [7] [8], the RF was estimated by using the same material with the one of phantom for CT measurement. In this study, we demonstrated two different analysis scenarios.…”

Section: Methodsmentioning

confidence: 99%

Section: The Relationship Between the Measured Currents And X-ray Enementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effective Atomic Number Measurement with Energy-Resolved Computed Tomography Using Two-Dimensional “transXend” Detector

Iramina¹,

Nakamura²,

Mizowaki³

et al. 2018

IJMPCERO

Self Cite

View full text Add to dashboard Cite

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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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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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A Current-Mode Detector for Unfolding X-ray Energy Distribution

Cited by 15 publications

References 6 publications

Effective Atomic Number Measurement with Energy-Resolved Computed Tomography Using Two-Dimensional “transXend” Detector

Effective Atomic Number Measurement with Energy-Resolved Computed Tomography Using Two-Dimensional “transXend” Detector

Energy subtraction computed tomography measured by current-mode detector

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

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