High Sensitive X-ray Microcalorimeter Using Bi–Au Microabsorber for Imaging Applications

Kudo, Hiroyuki; Arakawa, Takahiro; Ohtsuka, S.; Izumi, T.; Shoji, Shuichi; Sato, Hirotaka; Kobayashi, H.; Möri, K.; Homma, Takayuki; Osaka, Tetsuya; Iyomoto, Naoko; Fujimoto, R.; Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Oshima, Tai; Futamoto, K.; Takei, Yoh; Ichitsubo, T.; Fujimori, T.; Ishisaki, Yoshitaka; Morita, U.; Koga, T.; Shinozaki, Kazuo; Sato, Kousuke; Ohashi, T.; Kuroda, Yoshihiro; Onishi, M.; Otake, K.; Beppu, F.

doi:10.1143/jjap.43.1190

Cited by 7 publications

(1 citation statement)

References 16 publications

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“…The development of pixelated CZT, 23 HPGe, 24 Si-pin, 25 and microcalorimeter 26 detectors, capable of measuring the spatial and energy distribution of the transmitted and scattered x-ray beam, has prompted us to investigate the potential for using this type of detector for imaging Compton scatter. With our algorithm, the scatter that would normally degrade the image SNR may be used to enhance it.…”

Section: Introductionmentioning

confidence: 99%

An iterative three‐dimensional electron density imaging algorithm using uncollimated Compton scattered x rays from a polyenergetic primary pencil beam

2006

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X-ray film-screen mammography is currently the gold standard for detecting breast cancer. However, one disadvantage is that it projects a three-dimensional (3D) object onto a two-dimensional (2D) image, reducing contrast between small lesions and layers of normal tissue. Another limitation is its reduced sensitivity in women with mammographically dense breasts. Computed tomography (CT) produces a 3D image yet has had a limited role in mammography due to its relatively high dose, low resolution, and low contrast. As a first step towards implementing quantitative 3D mammography, which may improve the ability to detect and specify breast tumors, we have developed an analytical technique that can use Compton scatter to obtain 3D information of an object from a single projection. Imaging material with a pencil beam of polychromatic x rays produces a characteristic scattered photon spectrum at each point on the detector plane. A comparable distribution may be calculated using a known incident x-ray energy spectrum, beam shape, and an initial estimate of the object's 3D mass attenuation and electron density. Our iterative minimization algorithm changes the initially arbitrary electron density voxel matrix to reduce regular differences between the analytically predicted and experimentally measured spectra at each point on the detector plane. The simulated electron density converges to that of the object as the differences are minimized. The reconstruction algorithm has been validated using simulated data produced by the EGSnrc Monte Carlo code system. We applied the imaging algorithm to a cylindrically symmetric breast tissue phantom containing multiple inhomogeneities. A preliminary ROC analysis scores greater than 0.96, which indicate that under the described simplifying conditions, this approach shows promise in identifying and localizing inhomogeneities which simulate 0.5 mm calcifications with an image voxel resolution of 0.25 cm and at a dose comparable to mammography.

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Section: Introductionmentioning

confidence: 99%

An iterative three‐dimensional electron density imaging algorithm using uncollimated Compton scattered x rays from a polyenergetic primary pencil beam

2006

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Microstructure and electrical transport in electrodeposited Bi films

Moral‐Vico

Camón

Pobes

et al. 2019

Journal of Electroanalytical Chemistry

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The semimetal character of bismuth and its large photon absorbing power make of this element the most suitable absorber material for X-ray low temperature detectors. This application requires coatings of Bi with thicknesses and properties that only electrodeposition methods may achieve.Although there are studies on electrodeposition of bismuth for these detectors and other devices, the process is not straightforward and has not been sufficiently studied in terms of the desired final properties, neither the effect of different parameters is well known or easily reproduced. This work reports the influence of two different electrolytes, of the deposition method, and of heating and stirring on the structure, microstructure and transport properties of bismuth films. Typically, rhombohedral Bi is obtained upon electrodeposition with very good crystallinity, and some crystal preferential orientation, while significant empirical correlations are found among electrochemical parameters, microstructure, and resistivity. Such correlation allows the identification of the deposition parameters for coatings that yield the optimal functional properties.

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Evaluation of 256-pixel TES microcalorimeter arrays with electrodeposited Bi absorbers

Morita

Yamakawa

Fujimori

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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High Sensitive X-ray Microcalorimeter Using Bi–Au Microabsorber for Imaging Applications

Cited by 7 publications

References 16 publications

An iterative three‐dimensional electron density imaging algorithm using uncollimated Compton scattered x rays from a polyenergetic primary pencil beam

An iterative three‐dimensional electron density imaging algorithm using uncollimated Compton scattered x rays from a polyenergetic primary pencil beam

Microstructure and electrical transport in electrodeposited Bi films

Evaluation of 256-pixel TES microcalorimeter arrays with electrodeposited Bi absorbers

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