Effective atomic number measurement with energy-resolved X-ray computed tomography

Kanno, Ikuo; Yamashita, Yoshiki; Kimura, Masashi; Inoue, Fukutaro

doi:10.1016/j.nima.2014.11.072

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…To make the transXend detector system two-dimensional, we used a FPD and stripe absorbers which consist of two different absorbers A and B in a lattice shape, as shown in Figure 1 [9]. With the stripe absorbers …”

Section: Two-dimensional Transxend Detectormentioning

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: Two-dimensional Transxend Detectormentioning

confidence: 99%

“…Yamashita et al reported that Z eff of aluminum was measured within 1% error, where the error was defined as (Z eff − Z)/Z [8]. Kanno et al also reported that relative error of measured Z eff s of water and acrylic were within 3% [9]. Both studies were performed by the 1D transXend detector.…”

Section: Introductionmentioning

confidence: 99%