Investigation of dual-energy X-ray photon counting using a cadmium telluride detector and two comparators and its application to photon-count energy subtraction

Hagiwara, Osahiko; Satô, Eiichi; Watanabe, Manabu; Sato, Yuich; Oda, Y.; Miyata, Hiroshi; Osawa, Akihiro; Enomoto, Toshiyuki; Kusachi, Shozo; Ehara, Shigeru

doi:10.7567/jjap.53.102202

Cited by 19 publications

(7 citation statements)

References 15 publications

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“…To carry out fundamental experiments concerning the K-edge CT using I and gadolinium (Gd) media, we constructed several first-generation energy-dispersive CT scanners [10] [11] [12] using CdTe detectors for measuring X-ray spectra. Using these scanners, thick blood vessels are observed at high contrasts, since the energy resolution has been improved to approximately 1% at 122 keV.…”

Section: Introductionmentioning

confidence: 99%

Dual-Energy X-Ray Computed Tomography Scanner Using Two Different Energy-Selection Electronics and a Lutetium-Oxyorthosilicate Photomultiplier Detector

Hagiwara¹,

Satô²,

Oda³

et al. 2017

IJMPCERO

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To obtain two kinds of tomograms at two different X-ray energy ranges simultaneously, we have constructed a dual-energy X-ray photon counter with a lutetium-oxyorthosilicate photomultiplier detector system, three comparators, two microcomputers, and two frequency-voltage converters. X-ray photons are detected using the detector system, and the event pulses are input to three comparators simultaneously to determine threshold energies. At a tube voltage of 100 kV, the three threshold energies are 16, 35 and 52 keV, and two energy ranges are 16 -35 and 52 -100 keV. X-ray photons in the two ranges are counted using microcomputers, and the logical pulses from the two microcomputers are input to two frequency-voltage converters. In dual-energy computed tomography (CT), the tube voltage and current were 100 kV and 0.29 mA, respectively. Two tomograms were obtained simultaneously at two energy ranges. The energy ranges for gadolinium-L-edge and K-edge CT were 16 -35 and 52 -100 keV, respectively. The maximum count rate of dual-energy CT was 105 kilocounts per second with energies ranging from 16 to 100 keV, and the exposure time for tomography was 19.6 min.

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Section: Introductionmentioning

confidence: 99%

Dual-Energy X-Ray Computed Tomography Scanner Using Two Different Energy-Selection Electronics and a Lutetium-Oxyorthosilicate Photomultiplier Detector

Hagiwara¹,

Satô²,

Oda³

et al. 2017

IJMPCERO

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“…To measure X-ray spectra, we usually use a fairly available cadmium telluride (CdTe) detector with a photon energy resolution of 1% at 122 keV, and the detector has been applied to a linear X-ray scanner in a photon-counting energy-dispersive computed tomography (ED-CT) systems (Matsukiyo et al, 2011;Shimamura et al, 2014;Hagiwara et al, 2014). Subsequently, a preclinical ED-CT system with a CdTe detector array (Feuerlein et al, 2008;Wang et al, 2011) has been developed to perform enhanced K-edge CT using contrast media in Medical Imaging.…”

Section: Introductionmentioning

confidence: 99%

Measurement of X-ray spectra using a Lu2(SiO4)O-multipixel-photon detector with changes in the pixel number

Yamaguchi

Satô

Oda

et al. 2015

Applied Radiation and Isotopes

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To measure X-ray spectra with high count rates, we developed a detector consisting of a Lu2(SiO4)O [LSO] crystal with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrents flowing through the MPPC are converted into voltages and amplified by a high-speed current-voltage amplifier, and event pulses from the amplifier are sent to a multichannel analyzer to measure spectra. We used three MPPCs of 100, 400 and 1600 pixels/mm(2), and the MPPCs were driven under pre-Geiger mode at a temperature of 20 °C. At a tube voltage of 100 kV and a tube current of 5.0 μA, the maximum count rate was 12.8 kilo-counts per second. The event-pulse widths were 200 ns, and the energy resolution was 53% at 59.5 keV using a 100-pixel MPPC.

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“…Small field dosimetry is complicated due to electron disequilibrium, steep dose gradient and perturbation due to different densities of the detector and the medium [3]. They have demonstrated that due to excellent spatial resolution EBT3 Radio-chromic films can be used as economical small field dosimeter with high sensitivity, reproducibility and ease of use.In the paper titled BDual-energy high-count-rate X-ray computed tomography scanner using a cerium-doped yttrium aluminum perovskite crystal and a smallphotomultiplier tube^Tsukuru Sato et al have developed a dual energy (DE) computed tomography (CT) scanner using detector which consisting of a cerium doped yttrium aluminum perovskite and a Photo Multiplier Tube (PMT), to improve both the spatial and energy resolution at two different energies for improved imaged quality [4,5].In the paper titled BTriple-energy high-count-rate X-ray computed tomography scanner using a cadmium telluride detector^Eiichi Sato et al have developed a triple energy (TE) computed tomography scanner using detector which * Arun Chougule …”

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confidence: 99%

“…In the paper titled BDual-energy high-count-rate X-ray computed tomography scanner using a cerium-doped yttrium aluminum perovskite crystal and a smallphotomultiplier tube^Tsukuru Sato et al have developed a dual energy (DE) computed tomography (CT) scanner using detector which consisting of a cerium doped yttrium aluminum perovskite and a Photo Multiplier Tube (PMT), to improve both the spatial and energy resolution at two different energies for improved imaged quality [4,5].…”

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Editorial

Chougule

Stoeva

2018

Health Technol.

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BEvery once in a while, a new technology, an old problem, and a big idea turn into an innovation^-Dean Kamen Radiation therapy is a leading branch in cancer management these days. This branch is highly influenced by technical development and innovation in radiation treatment delivering and diagnosing equipment with high accuracy and precision. Radiation treatment is an effective, personalized cancer treatment that has benefited from technological advancements. Given that these advances have played a central role in the success of radiation therapy as a major component of comprehensive cancer care [1,2].The purpose of this special issue is to provide a platform to discuss new ideas of emerging technology for the field and to recognize areas for greater research investment. Expert clinicians and scientists discussed innovative technology in radiation oncology, in particular as to how these technologies are being developed and translated to clinical practice in the face of future challenges and opportunities.In this issue we have included technologies encompassed topics in functional imaging, treatment devices, nanotechnology, and information technology (IT), radiation dosimetry. The technical, quality and safety performance of these technologies is also considered. A major theme of the issue was the growing importance of innovation in the domain of process automation, oncology informatics and better diagnosis. This issue includes five papers which were presented during AOCMP-AMPICON2017 in Jaipur, India. The selection criteria of papers is on the basis of innovative original ideas, economical technology development, automation, radiation dosimetry in field of radio-diagnosis and radiotherapy.In the paper titled BDevelopment of a CMOS-based Optical Computed Tomography System (CMOS-OCT) for 3D Radiotherapy Dosimetry^Nurul Farah Rosli et al. have shown characteristics of in-house developed 3D imaging system named BOptical Computed Tomography (OCT) for ensuring radiotherapy dose delivered to PRESAGE™ dosimeters. It reconstructs dose distributions delivered to the radiochromic PRESAGE™ that changes its colour when irradiated. The results show that the system is capable of capturing the projection images of a 3D translucent object with good linearity and uniformity.In the paper titled BAn inexpensive method of Small Photon Field Dosimetry with EBT3 Radiochromic FilmÂ nkurMourya et al. have developed a MATLAB program to use EBT3 Radiochromic films as a dosimeter for small field dosimetry. Small field dosimetry is complicated due to electron disequilibrium, steep dose gradient and perturbation due to different densities of the detector and the medium [3]. They have demonstrated that due to excellent spatial resolution EBT3 Radio-chromic films can be used as economical small field dosimeter with high sensitivity, reproducibility and ease of use.In the paper titled BDual-energy high-count-rate X-ray computed tomography scanner using a cerium-doped yttrium aluminum perovskite crystal and a smallphotomultiplier tube^Tsukuru S...

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Investigation of dual-energy X-ray photon counting using a cadmium telluride detector and two comparators and its application to photon-count energy subtraction

Cited by 19 publications

References 15 publications

Dual-Energy X-Ray Computed Tomography Scanner Using Two Different Energy-Selection Electronics and a Lutetium-Oxyorthosilicate Photomultiplier Detector

Dual-Energy X-Ray Computed Tomography Scanner Using Two Different Energy-Selection Electronics and a Lutetium-Oxyorthosilicate Photomultiplier Detector

Measurement of X-ray spectra using a Lu2(SiO4)O-multipixel-photon detector with changes in the pixel number

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