Search Results 1-20 of 94

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  • Comparison of Detectability for the New Image Processing and Conventional Image Processing by ROC Analysis: A Phantom Study of Chest Radiography  [in Japanese]

    Kiriki Masato , Kotoura Noriko , Osaki Takao , Nakagawa Hideo , Nakamura Mitsuru , Fujikawa Keita , Nakamura Kenji , Kikuchi Keisuke , Hama Yasuhiko , Hagiwara Yu

    … <p>The purpose of this study is to compare the detectability of diseases the new image processing and the conventional image processing by receiver operating characteristic (ROC) analysis and to show the usefulness of the new image processing. … The mean area under the curve (AUC) calculated from the over 20 years group was 0.754 for the new processing and 0.771 for the conventional processing (p value=0.651, 95% confidence interval=−0.084/0.049 (lower bound/upper bound)). …

    Japanese Journal of Radiological Technology 76(2), 203-209, 2020


  • Cerebral Arterial Stiffness as A New Marker of Early Stage Atherosclerosis of The Cerebral Large Artery in Acute Stroke

    Fu Xian , Li Xianliang , Xiong Li , Li Xuelong , Huang Ruxun , Gao Qingchun

    … Eighty-one acute ischemic stroke (AIS) patients with 154 C-M segments who were successfully evaluated with digital subtraction angiography, ccPWV, carotid intima–media thickness (cIMT), and brachial–ankle pulse wave velocity were enrolled into this study. … ccPWV and cIMT presented good diagnostic values for evaluating early stage CMSA in the receiver operating characteristic curve analyses. …

    Journal of Atherosclerosis and Thrombosis 26(9), 783-791, 2019


  • Development and Evaluation of a PC-controlled LED Photometer Utilizing a Microcontroller  [in Japanese]

    KATANO Hajime

    … The intensity of the emitting light is controlled from PC through the USB communication interface and the digital/analog converter of the microcontroller. … The intensity data of the light passed through the sample is sent to a PC through the analog/digital converter of the microcontroller and is handled to calculate the absorbance, Abs. …

    BUNSEKI KAGAKU 68(6), 381-386, 2019


  • A Grading Scale for Pial Collaterals in Middle Cerebral Artery Total Occlusion Based on Time-of-flight MR Angiography Source Images

    Yuan Huai Wu , Ji Ren Jie , Wang An Li , Lin Ya Jie , Chen Han Feng , Xu Zi Qi , Peng Guo Ping , Luo Ben Yan

    … <p>Purpose: To verify whether a new grading based on time-of-flight magnetic resonance angiography source images (TOF-MRAsi) can reflect the abundance of pial collaterals, in patients with total occlusion of M1 segment of middle cerebral artery in the chronic stage.</p><p>Methods: In this single-center retrospective study, consecutive patients with total occlusion of M1 segment of middle cerebral artery, with both magnetic resonances angiography and digital subtraction angiography image were included. …

    Magnetic Resonance in Medical Sciences 18(1), 62-69, 2019


  • The role of breast tomosynthesis in a predominantly dense breast population at a tertiary breast centre: breast density assessment and diagnostic performance in comparison with MRI

    Förnvik Daniel , Kataoka Masako , Iima Mami , Ohashi Akane , Kanao Shotaro , Toi Masakazu , Togashi Kaori

    … Objectives: To compare breast density measured on digital breast tomosynthesis (DBT) (BI-RADS-based breast composition and fully-automatic estimation) and magnetic resonance imaging (MRI) (BI-RADS amount of fibroglandular tissue), and to evaluate the diagnostic performance in terms of sensitivity and specificity of DBT and MRI in a predominantly dense breast population. … Digital mammography images were analysed for breast percent density (PD) using the Libra software tool. …

    European radiology 28(8), 3194-3203, 2018-08


  • The Measurement of X-ray Fluoroscopy Input-output Characteristics in Angiography System  [in Japanese]

    Hagihara Yoshiaki , Umehara Takayoshi , Matsumoto Kazuma , Fujita Tomoko , Ikeuchi Youko , Fujikawa Keita , Takahashi Yoshiyuki , Kotoura Noriko

    … The area to measure the digital value was selected at the center of the irradiation field, and the dosimeter was placed at the right side of the area, which was selected to measure the digital value. … We obtained a characteristic curve from the measured dose and the digital value. …

    Japanese Journal of Radiological Technology 73(2), 96-103, 2017


  • Circulating cell-free DNA-based epigenetic assay can detect early breast cancer

    Uehiro Natsue , Sato Fumiaki , Pu Fengling , Tanaka Sunao , Kawashima Masahiro , Kawaguchi Kosuke , Sugimoto Masahiro , Saji Shigehira , Toi Masakazu

    … Thus, the aim of the present study was to develop a highly sensitive cfDNA-based system for detection of primary breast cancer (BC) using epigenetic biomarkers and digital PCR technology. … Epigenetic markers for BC detection were selected, and a droplet digital methylation-specific PCR (ddMSP) panel with the selected markers was established. …

    Breast Cancer Research 18(1), 2016-12-19


  • Examination for Effectiveness of Scatter Correction in Portable Chest Radiography  [in Japanese]

    Ichikawa Hajime , Ono Takaaki , Sawane Yasuhiro , Terabe Mitsuaki , Yamaguchi Minoru , Shimada Hideki

    … <i>Methods</i>: Digital radiographies were performed without anti-scatter grid (grid), with the scatter correction and with the grid ratio of 3 : 1 in this study. … The area under the receiver operating characteristic curve for the grid technique was higher than that for the scatter correction technique (0.888 vs. 0.855), although no significant difference was found between the grid and the scatter correction technique (p> …

    Japanese Journal of Radiological Technology 72(12), 1207-1215, 2016


  • Evaluation of restenosis after carotid artery stenting using acceleration time in carotid ultrasonography  [in Japanese]

    KAMIYA Yuki , MORI Misako , KURIKI Ayako , MIZUMA Keita , ICHIKAWA Hiroo , KAWAMURA Mitsuru

    … The stenosis was measured by CT or digital angiography in 16 patients (22 examinations) using the NASCET method. … In a receiver operating characteristic curve analysis, the sensitivity and specificity of ICA-AcT using 107.7 msec as a cut-off were 85.7% and 88.4%, respectively, for predicting PSV > …

    Neurosonology 28(2), 54-58, 2015

    J-STAGE  Ichushi Web 

  • Comparative Study of Patient Identifications for Conventional and Portable Chest Radiographs Utilizing ROC Analysis  [in Japanese]

    Kawashima Hiroki , Hayashi Norio , Ohno Naoki , Matsuura Yukihiro , Sanada Shigeru

    … ROC analysis was conducted to calculate the average area under ROC curve obtained by each observer (AUCave), and a statistical test was performed using the multi-reader multi-case method. …

    Japanese Journal of Radiological Technology 71(8), 663-669, 2015

    J-STAGE  Ichushi Web 

  • G1000102 Dynamic Characteristics Simulator for Seawater Desalination Plant  [in Japanese]

    SANO Tadashi , TSUKADA Nobuhiro , OKUMA Keiji

    … This HILS system mounted simulation model of the plant on a digital signal processor (DSP). … In modeling of constituent equipment, characteristic curve was linearized locally for reducing analysis time, and analysis accuracy was improved by reducing time inclement. …

    The Proceedings of Mechanical Engineering Congress, Japan 2015(0), _G1000102--_G1000102-, 2015


  • Investigation on Classification of Benign and Malignant Masses on Mammograms by Use of Modified Local Ternary Pattern  [in Japanese]

    MURAMATSU Chisako , ZHANG Min , HARA Takeshi , Endo Tokiko , FUJITA Hiroshi

    … With the selected features, the classification performance was 0.82 in terms of the area under the receiver operating characteristic curve. …

    IEICE technical report. 113(410), 327-330, 2014-01-26


  • Accuracy of a Digital Weight Scale Relative to the Nintendo Wii in Measuring Limb Load Asymmetry

    Kumar NS Senthil , Omar Baharudin , Joseph Leonard H , Hamdan Nor , Htwe Ohnmar , Hamidun Nursalbiyah

    … [Purpose] The aim of the present study was to investigate the accuracy of a digital weight scale relative to the Wii in limb loading measurement during static standing. … Limb loading measurements were obtained using a digital weight scale and the Nintendo Wii in static standing with three trials under an eyes-open condition. …

    Journal of Physical Therapy Science 26(8), 1205-1207, 2014

    J-STAGE  Ichushi Web 

  • Diagnostic Detection Performance of a Simulated Nodule in Chest Computed Tomography Images and Gray and Color Nuclear Medicine Images: Comparison between a Medical Liquid Crystal Display Monitor and an Ordinary Liquid Crystal Display Monitor  [in Japanese]

    Okumura Eiichiro , Kamimae Riyou , Miyashita Kenta , Ueda Rina , Kanmae Yusuke , Kubo Mikayo , Shirasaka Natsumi , Takeda Taiki , Hashimoto Noriyuki

    … We collected 72 chest CT image slices obtained from an LSCT phantom with simulated signals composed of various sizes and CT values and 78 slices of monochrome and color nuclear medicine images obtained from a digital phantom with a simulated signal composed of various sizes and radiation levels. … Six observers performed receiver operating characteristic (ROC) analysis using a continuous scale. … The area under the ROC curve (AUC) was calculated for each monitor. …

    Japanese Journal of Radiological Technology 70(8), 757-767, 2014

    J-STAGE  Ichushi Web 

  • The degree of microRNA-34b/c methylation in serum-circulating DNA is associated with malignant pleural mesothelioma

    Muraoka Takayuki , Soh Junichi , Toyooka Shinichi , Aoe Keisuke , Fujimoto Nobukazu , Hashida Shinsuke , Maki Yuho , Tanaka Norimitsu , Shien Kazuhiko , Furukawa Masashi , Yamamoto Hiromasa , Asano Hiroaki , Tsukuda Kazunori , Kishimoto Takumi , Otsuki Takemi , Miyoshi Shinichiro

    … In this study, we estimated the degree of miR-34b/c methylation in serum-circulating DNA using a digital methylation specific PCR assay (MSP). … The melting temperature (Tm) of each PCR product was examined using a melting curve analysis. … For a digital MSP assay, 40 wells were analyzed per sample. …

    Lung Cancer 82(3), 485-490, 2013-12


  • A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system.

    Utsunomiya Satoru , Monzen Hajime , Akimoto Mami , Mukumoto Nobutaka , Ishihara Yoshitomo , Shiinoki Takehiko , Nakamura Mitsuhiro , Miyabe Yuki , Sato Sayaka , Matsuo Satoru , Hiraoka Masahiro

    … We investigated the neonatal entrance-surface dose (ESD) and doses of scattered radiation emitted by a digital mobile X-ray system. … In the present study, the following three experiments were performed on frequently used X-ray-imaging condition: (1) the digital characteristics of the FPD were evaluated; …

    Radiological physics and technology 6(1), 157-161, 2013-01

    IR  Ichushi Web 

  • A Range-Extended and Area-Efficient Time-to-Digital Converter Utilizing Ring-Tapped Delay Line

    WANG Xin-Gang , WANG Fei , JIA Rui , CHEN Rui , ZHI Tian , YANG Hai-Gang

    … This paper proposes a coarse-fine Time-to-Digital Converter (TDC), based on a Ring-Tapped Delay Line (RTDL). … Experimental results show that the measured characteristic curve has high-level linearity; …

    IEICE Transactions on Electronics E96.C(9), 1184-1194, 2013


  • Development of the characteristic curve of the computed radiography system by means of moving multi-slits  [in Japanese]

    TAKEGAMI Kazuki , HAYASHI Hiroaki , KIMOTO Natsumi , MAEHATA Itsumi , NONOMIYA Izumi , FUKUDA Ikuma , KONISHI Yuki

    … When the characteristic curve of a phosphor plate is obtained, the fading effect should be considered. … Therefore, we have developed a new experimental apparatus which can measure the characteristic curve in a short period of time using only a single exposure. …

    Medical Imaging and Information Sciences 30(3), 53-56, 2013

    J-STAGE  Ichushi Web  Cited by (1)

  • J044011 Deformation Behavior of Magnetic Shape Memory Alloy films  [in Japanese]

    MURASAWA Go , KOHL Manfred , SEBASTIAN Sebastian

    … The phase transformation band nucleations were measured using Stress Drop Analysis (SDA) in macroscopic stress-strain curve, and strain fields were measured using Digital Image Correlation (DIC) method. … Results showed that the phase transformation band size distribution displayed distinctive characteristic. …

    The Proceedings of Mechanical Engineering Congress, Japan 2013(0), _J044011-1-_J044011-4, 2013


  • Investigation of Image Quality Identification Utilizing Physical Image Quality Measurement in Direct- and Indirect-type of Flat Panel Detectors and Computed Radiography  [in Japanese]

    YOKOI Tomohiro , TAKATA Tadanori , ICHIKAWA Katsuhiro

    … For each system, the digital characteristic curve, the presampled modulation transfer function (MTF), and the normalized noise power spectrum (NNPS) were measured. …

    Japanese Journal of Radiological Technology 67(11), 1415-1425, 2011-11-20

    J-STAGE  Ichushi Web  References (20) Cited by (1)

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