Search Results - "Kojima, Tsukasa"

Deep-learning reconstruction for ultra-low-dose lung CT: Volumetric measurement accuracy and reproducibility of artificial ground-glass nodules in a phantom study by Mikayama, Ryoji, Shirasaka, Takashi, Kojima, Tsukasa, Sakai, Yuki, Yabuuchi, Hidetake, Kondo, Masatoshi, Kato, Toyoyuki

“…The lung nodule volume determined by CT is used for nodule diagnoses and monitoring tumor responses to therapy. Increased image noise on low-dose CT degrades…”
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Right Ventricular Strain With 4-Dimensional Computed Tomography Identifies Pulmonary Hypertension in Adults With Repaired Tetralogy of Fallot by Shimomiya, Yamato, Nagao, Michinobu, Kogure, Tomohito, Asagai, Seiji, Inoue, Akihiro, Yamamoto, Atsushi, Sakai, Shuji, Inai, Kei, Shirasaka, Takashi, Kojima, Tsukasa, Yabuuchi, Hidetake

“…Background: This study evaluated right ventricular (RV) volume, strain, and morphology using cardiac 4-dimensional computed tomography (4D-CT) to detect…”
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Characteristics of the deep learning-based virtual monochromatic image with fast kilovolt-switching CT: a phantom study by Katsuyama, Yuna, Kojima, Tsukasa, Shirasaka, Takashi, Kondo, Masatoshi, Kato, Toyoyuki

“…Purpose We assessed the physical properties of virtual monochromatic images (VMIs) obtained with different energy levels in various contrast settings and…”
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Low-radiation dose scan protocol for preoperative imaging for dental implant surgery using deep learning-based reconstruction in multidetector CT by Sakai, Yuki, Kitamoto, Erina, Okamura, Kazutoshi, Takarabe, Shinya, Shirasaka, Takashi, Mikayama, Ryoji, Kondo, Masatoshi, Tatsumi, Masato, Kojima, Tsukasa, Kato, Toyoyuki, Yoshiura, Kazunori

“…Objectives This study aimed to investigate the impact of a deep learning-based reconstruction (DLR) technique on image quality and reduction of radiation…”
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New transluminal attenuation gradient derived from dynamic coronary CT angiography: diagnostic ability of ischemia detected by 13N-ammonia PET by Kojima, Tsukasa, Nagao, Michinobu, Yabuuchi, Hidetake, Yamasaki, Yuzo, Shirasaka, Takashi, Kawakubo, Masateru, Fukushima, Kenji, Kato, Toyoyuki, Yamamoto, Atsushi, Nakao, Risako, Sakai, Akiko, Watanabe, Eri, Sakai, Shuji

“…Coronary computed tomography angiography (CCTA) has low specificity for detecting significant functional coronary stenosis. We developed a new transluminal…”
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Influence of beam hardening in dual-energy CT imaging: phantom study for iodine mapping, virtual monoenergetic imaging, and virtual non-contrast imaging by Kanatani, Risa, Shirasaka, Takashi, Kojima, Tsukasa, Kato, Toyoyuki, Kawakubo, Masateru

“…In this study, we investigated the influence of beam hardening on the dual-energy computed tomography (DECT) values of iodine maps, virtual monoenergetic (VME)…”
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Low Radiation Dose and High Image Quality of 320-Row Coronary Computed Tomography Angiography Using a Small Dose of Contrast Medium and Refined Scan Timing Prediction by Shirasaka, Takashi, Nagao, Michinobu, Yamasaki, Yuzo, Kojima, Tsukasa, Kondo, Masatoshi, Hamasaki, Hiroshi, Kamitani, Takeshi, Kato, Toyoyuki, Asayama, Yoshiki

“…The aim of the study was to investigate the feasibility of coronary computed tomography (CT) angiography with a low kilovoltage peak scan and a refined scan…”
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Importance of the heart rate in ultra-high-resolution coronary CT angiography with 0.35 s gantry rotation time by Kojima, Tsukasa, Shirasaka, Takashi, Yamasaki, Yuzo, Kondo, Masatoshi, Hamasaki, Hiroshi, Mikayama, Ryoji, Sakai, Yuki, Kato, Toyoyuki, Nishie, Akihiro, Ishigami, Kousei, Yabuuchi, Hidetake

“…Purpose We investigated the effects of the heart rate (HR) on the motion artifact in coronary computed tomography angiography (CCTA) with…”
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A deep learning model based on fusion images of chest radiography and X-ray sponge images supports human visual characteristics of retained surgical items detection by Kawakubo, Masateru, Waki, Hiroto, Shirasaka, Takashi, Kojima, Tsukasa, Mikayama, Ryoji, Hamasaki, Hiroshi, Akamine, Hiroshi, Kato, Toyoyuki, Baba, Shingo, Ushiro, Shin, Ishigami, Kousei

“…Purpose Although a novel deep learning software was proposed using post-processed images obtained by the fusion between X-ray images of normal post-operative…”
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Feasible scan timing for 320-row coronary CT angiography generated by the time to peak in the ascending aorta by Shirasaka, Takashi, Nagao, Michinobu, Yamasaki, Yuzo, Kojima, Tsukasa, Kondo, Masatoshi, Shimomiya, Yamato, Kamitani, Takeshi, Honda, Hiroshi

“…A 320-row CT scanner can briefly scan the entire heart. Therefore, the feasible scan timing is required. The aim of this study was to propose a refined method…”
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Effect of scan mode and focal spot size in airway dimension measurements for ultra-high-resolution computed tomography of chronic obstructive pulmonary disease: A COPDGene phantom study by Mikayama, Ryoji, Shirasaka, Takashi, Yabuuchi, Hidetake, Sakai, Yuki, Kojima, Tsukasa, Kondo, Masatoshi, Yoshikawa, Hideki, Kato, Toyoyuki

“…•UHRCT using the super high resolution (SHR) mode could improve measurement accuracy.•The small focal spot contributed to an accurate evaluation of a small…”
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Efficacy of periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) for shoulder magnetic resonance (MR) imaging by Nagatomo, Kazuya, BSc, RT, Yabuuchi, Hidetake, PhD, Yamasaki, Yuzo, PhD, Narita, Hiroshi, MSc, RT, Kumazawa, Seiji, PhD, RT, Kojima, Tsukasa, MSc, RT, Sakai, Noriyuki, BSc, RT, Masaki, Masahumi, RT, Kimura, Hiroshi, PhD

“…Abstract Objectives To elucidate the utility of PROPELLER for motion artefact reduction on shoulder MRI and to examine the influence of streak artefacts on…”
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The Feasibility of Deep Learning-Based Reconstruction for Low-Tube-Voltage CT Angiography for Transcatheter Aortic Valve Implantation by Kojima, Tsukasa, Yamasaki, Yuzo, Matsuura, Yuko, Mikayama, Ryoji, Shirasaka, Takashi, Kondo, Masatoshi, Kamitani, Takeshi, Kato, Toyoyuki, Ishigami, Kousei, Yabuuchi, Hidetake

“…The purpose of this study is to evaluate the efficacy of deep learning reconstruction (DLR) on low-tube-voltage computed tomographic angiography (CTA) for…”
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A novel fast kilovoltage switching dual-energy CT with deep learning: Accuracy of CT number on virtual monochromatic imaging and iodine quantification by Kojima, Tsukasa, Shirasaka, Takashi, Kondo, Masatoshi, Kato, Toyoyuki, Nishie, Akihiro, Ishigami, Kousei, Yabuuchi, Hidetake

“…•Deep learning spectral CT is a novel dual-energy CT with deep learning.•Deep learning spectral CT generates complete sinograms using deep learning views.•Deep…”
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Image quality improvement with deep learning‐based reconstruction on abdominal ultrahigh‐resolution CT: A phantom study by Shirasaka, Takashi, Kojima, Tsukasa, Funama, Yoshinori, Sakai, Yuki, Kondo, Masatoshi, Mikayama, Ryoji, Hamasaki, Hiroshi, Kato, Toyoyuki, Ushijima, Yasuhiro, Asayama, Yoshiki, Nishie, Akihiro

“…Purpose In an ultrahigh‐resolution CT (U‐HRCT), deep learning‐based reconstruction (DLR) is expected to drastically reduce image noise without degrading…”
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Volumetric measurement of artificial pure ground-glass nodules at low-dose CT: Comparisons between hybrid iterative reconstruction and filtered back projection by Sakai, Noriyuki, Yabuuchi, Hidetake, Kondo, Masatoshi, Kojima, Tsukasa, Nagatomo, Kazuya, Kawanami, Satoshi, Kamitani, Takeshi, Yonezawa, Masato, Nagao, Michinobu, Honda, Hiroshi

“…Highlights • Volumetry of pure ground-glass nodule using low-dose computed tomography was evaluated. • Hybrid Iterative Reconstruction provided lower…”
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Dynamic flow imaging using 320-detector row CT and motion coherence analysis in coronary aneurysms associated with Kawasaki disease by Shimomiya, Yamato, Nagao, Michinobu, Yamasaki, Yuzo, Shirasaka, Takashi, Kondo, Masatoshi, Kojima, Tsukasa, Nishie, Akihiro, Yamamura, Kenichiro, Honda, Hiroshi

“…Introduction We propose a new dynamic flow imaging using 320-detector row CT, and investigate the assessment of coronary flow in aneurysms of Kawasaki disease…”
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Efficacy of the radial acquisition regime (RADAR) for acquiring head and neck MR images by Kojima, Tsukasa, Yabuuchi, Hidetake, Narita, Hiroshi, Kumazawa, Seiji, Yamasaki, Yuzo, Yano, Yuki, Sakai, Noriyuki, Kurihara, Yoichi, Hisada, Kiyoshi, Masaki, Masafumi, Kimura, Hiroshi

“…To investigate the efficacy of the radial acquisition regime (RADAR) for acquiring head and neck MR images. 15 healthy volunteers underwent imaging with 4…”
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New transluminal attenuation gradient derived from dynamic coronary CT angiography: diagnostic ability of ischemia detected by 13 N-ammonia PET by Kojima, Tsukasa, Nagao, Michinobu, Yabuuchi, Hidetake, Yamasaki, Yuzo, Shirasaka, Takashi, Kawakubo, Masateru, Fukushima, Kenji, Kato, Toyoyuki, Yamamoto, Atsushi, Nakao, Risako, Sakai, Akiko, Watanabe, Eri, Sakai, Shuji

“…Coronary computed tomography angiography (CCTA) has low specificity for detecting significant functional coronary stenosis. We developed a new transluminal…”
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Reversed-phase high-performance liquid-chromatography of 2,8-dihydroxyadenine in serum and urine with electrochemical detection by Kojima, T, Nishina, T, Kitamura, M, Kamatani, N, Nishioka, K

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