Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Makoto Hirama"'
Publikováno v:
Journal of Clinical Ultrasound. 25:183-188
We created a new imaging technique that detects and emphasizes turbulence, which is a characteristic of blood flow in hepatocellular carcinoma. We devised two indices that determine a characteristic tumor flow, the bi-directional and low-peak indices
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79f0e0acc5d16831a6b40d220402491d
https://doi.org/10.1002/(sici)1097-0096(199705)25:4<183::aid-jcu5>3.0.co
https://doi.org/10.1002/(sici)1097-0096(199705)25:4<183::aid-jcu5>3.0.co
Publikováno v:
Journal of the American Society of Echocardiography. 8:621-630
A new method has been developed for measuring the volume flow rate of blood flowing through large vessels or outflow tracts of the heart. In this article we describe the principle of a method that can reduce the dependence of the Doppler angle of flo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f203c67f2bdc153a022228c1cfd01830
https://doi.org/10.1016/s0894-7317(05)80375-x
https://doi.org/10.1016/s0894-7317(05)80375-x
Autor:
Nobuo Yamazaki, Masaaki Uematsu, Masakazu Yamagishi, Kunio Miyatake, Akihiro Sano, Norio Tanaka, Makoto Hirama, Yoshitake Mine
Publikováno v:
Journal of the American College of Cardiology. 25:717-724
Objectives. The aim of this study was to examine the accuracy and validity of a newly developed tissue Doppler imaging system in in vitro and in vivo studies. Background. Because quantitative measurement of wall motion velocity in real time is still
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b050ff1a04c9131e387ad16880b1c49
https://doi.org/10.1016/0735-1097(94)00421-l
https://doi.org/10.1016/0735-1097(94)00421-l
Publikováno v:
Applied optics. 20(3)
An iterative technique is proposed for improving the quality of reconstructions from projections when the number of projections is small or the angular range of projections is limited. The technique consists of transforming repeatedly between image a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f082798099bad58c5e89cd2d5b55fa3
https://pubmed.ncbi.nlm.nih.gov/20309122
https://pubmed.ncbi.nlm.nih.gov/20309122
Autor:
Makoto Hirama, Kiyoshi Okazaki, Kinya Takamizawa, Yasuaki Takehara, Kazuhiro Iinuma, Masafumi Kondo
Publikováno v:
Ultrasound in Medicine & Biology. 16:65-72
An in vivo local sound speed estimation technique, using the crossed beam method, has been proposed and its applicability was evaluated. At first, the potential of this technique was studied by a mapping simulation using the ray tracing technique fol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0246ca7b4000b1900a10d8bb161a3cc4
https://doi.org/10.1016/0301-5629(90)90087-s
https://doi.org/10.1016/0301-5629(90)90087-s
Autor:
Norio Tanaka, Makoto Hirama, Hisao Matsuda, Akihiro Sano, Masaaki Uematsu, Masakazu Yamagishi, Kunio Miyatake, Nobuo Yamazaki
Publikováno v:
Journal of the American College of Cardiology. 26(1)
Objectives.This study was performed to assess a new indicator of regional left ventricular contraction determined by a two-dimensional tissue Doppler imaging technique.Background.Recent studies have demonstrated that instantaneous tissue motion veloc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39be21cc03aaa553acb927aac5905434
https://pubmed.ncbi.nlm.nih.gov/7797755
https://pubmed.ncbi.nlm.nih.gov/7797755
Publikováno v:
The Journal of the Acoustical Society of America. 128:965
An ultrasonic imaging apparatus, including an ultrasonic probe including an ultrasonic vibration element configured to transmit and receive an ultrasonic wave in a scanning direction in an object in which a contrast media has been injected; a transmi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b7f840108eff795487b20ffeb821854
https://doi.org/10.1121/1.3481758
https://doi.org/10.1121/1.3481758
Autor:
S. Nagata, Makoto Hirama, Naohisa Kamiyama, Hisao Matsuda, Masaaki Uematsu, Kunio Miyatake, Masakazu Yamagishi, Shintaro Beppu, Yoshitaka Mine
Publikováno v:
Journal of the American College of Cardiology. 25:205A
Detection of myocardial opacification after intravenous injection of contrast is of great diagnostic value. To achieve this goal. we applied harmonic imaging to myocardial contrast echocardiography. Contrast agents emit strong harmonics at double the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8ad50290218e93abf654a309f6ac0b4
https://doi.org/10.1016/0735-1097(95)92308-r
https://doi.org/10.1016/0735-1097(95)92308-r
Autor:
Norio Tanaka, Nobuo Yamazaki, Yoshitaka Mine, Akihiro Sano, Masakazu Yamagishi, Kunio Miyatake, Makoto Hirama
Publikováno v:
Japanese Journal of Applied Physics. 33:3141
We developed a new color Doppler system by which Doppler signals associated with tissue motion can be determined, and called it the tissue Doppler imaging (TDI) system. Using high-speed scanning, the frame rate was 26–38 F/s, and the pulse repetiti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19aef50c57b72bd2b78f7d10a9112d1a
https://doi.org/10.1143/jjap.33.3141
https://doi.org/10.1143/jjap.33.3141
Publikováno v:
The Journal of the Acoustical Society of America. 70:756-762
The concept of data selection during image formation is proposed to enhance ultrasonic images obtained by focusing through turbulent media. In this approach, a focused transducer array is used in transmit to concentrate the ultrasonic energy at a des
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cad98a84258450ba62d08e6e7ad54a87
https://doi.org/10.1121/1.386913
https://doi.org/10.1121/1.386913