Triple-sensitivity high-spatial-resolution X-ray computed tomography using a cadmium-telluride detector and its beam-hardening effect

Yoshida, Sohei; Satô, Eiichi; Oda, Y.; Yoshioka, Kunihiro; Moriyama, Hodaka; Watanabe, Manabu

doi:10.1016/j.apradiso.2020.109089

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…However, the energy-dispersive effect of cone-beam PCCT was lower than that of first-generation PCCT. Subsequently, we developed a first-generation beam-hardening CT (BHCT) scanner 7,8 using analog and digital amplifiers and confirmed the effective energy increase with increasing amplification factor. In the present research, major objectives are as follows: to perform fundamental experiments of cone-beam BHCT, to improve the spatial resolution below 100 m, to increase the effective photon energy by increasing digital amplification factor, and to carry out I-K-edge CT using I contrast media.…”

Section: Introductionmentioning

confidence: 94%

Energy-dispersive x-ray computed tomography utilizing beam hardening

Sato,

Ito,

Moriyama

et al. 2023

Applications of Digital Image Processing XLVI

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To perform energy-dispersive x-ray computed tomography (EDCT), we constructed a computer program to amplify the digital values of raw radiograms. The CT scanner consists of an x-ray generator with a 0.1-mm-focus tube, a turntable, a flat panel detector (FPD), and a personal computer (PC). An object on the turntable is irradiated by the x-ray generator, 1.3-magnified 720 radiograms are taken by the FPD, and tomograms are reconstructed using the PC. Utilizing the digital amplifier, the object projections obtained using low-energy photons disappeared with increasing amplification factor at a constant maximum value, and the effective energy increased according to increases in the amplification factor by beam hardening. Using the beam-hardening CT (BHCT) scanner, high-contrast tomography for various objects was performed by controlling effective energy. In particular, fine blood vessels were observed by K-edge CT using iodine media.

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Section: Introductionmentioning

confidence: 94%

Energy-dispersive x-ray computed tomography utilizing beam hardening

Sato,

Ito,

Moriyama

et al. 2023

Applications of Digital Image Processing XLVI

Self Cite

View full text Add to dashboard Cite

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Near-infrared-ray computed tomography with an 808 nm laser beam and high spatial resolutions

Satô

Oda

Yoshida

et al. 2021

Review of Scientific Instruments

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To increase the penetrating photons and to improve the spatial resolution in near-infrared-ray computed tomography (NIR-CT), we used an 808 nm laser module. The NIR photons are produced from the laser module, and an object is exposed to the laser beam. The laser power is controlled by the applied voltage, and the photodiode detects photons penetrating through the object. To reduce scattering photons from the object, a 1.0-mm-diameter graphite pinhole is set behind the object. The spatial resolutions were improved using a 1.0-mm-diameter 5.0-mm-length graphite collimator and were ∼1 × 1 mm2. The NIR-CT was accomplished by repeating the object-reciprocating translations and rotations of the object using the turntable, and the ray-sampling-translation and rotation steps were 0.1 mm and 0.5°, respectively. The scanning time was 19.6 min at a total rotation angle of 180°. Triple-sensitivity CT was accomplished using amplifiers, and a graphite rod in the chicken fillet was visible when increasing amplification factor.

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Fully digitalized triple-energy x-ray computed tomography with high spatial resolutions using beam hardening

Ito,

Sato,

Moriyama

et al. 2024

Review of Scientific Instruments

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To regulate the effective photon energy with a constant tube voltage and to perform enhanced K-edge x-ray imaging, we built a prototype fully digitalized triple-energy x-ray computed tomography (TECT) scanner utilizing beam hardening. An object on the turntable is irradiated by a 0.1-mm-focus x-ray tube at 1.4-time-magnification. 720 raw radiograms are obtained using a flat panel detector, and 512 tomograms are reconstructed. With an increasing digital amplification factor, the gray raw-density projections obtained using low-energy-photon absorption disappeared at a constant maximum raw density, and the effective energy was increased by x-ray beam hardening. TECT was performed at digital amplifier factors below 3.0, and the effective energy increased with increasing amplification factors. In particular, fine blood vessels were visible using gadolinium-K-edge CT.

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Triple-sensitivity high-spatial-resolution X-ray computed tomography using a cadmium-telluride detector and its beam-hardening effect

Cited by 4 publications

References 9 publications

Energy-dispersive x-ray computed tomography utilizing beam hardening

Energy-dispersive x-ray computed tomography utilizing beam hardening

Near-infrared-ray computed tomography with an 808 nm laser beam and high spatial resolutions

Fully digitalized triple-energy x-ray computed tomography with high spatial resolutions using beam hardening

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