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1. 发明专利

JPH0698878A METHOD AND APPARATUS FOR MRI NUMERICAL SIMULATION 失效
公开(公告)号：JPH0698878A
公开(公告)日：1994-04-12
申请号：JP24296392
申请日：1992-09-11
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： NAKATANI CHITOSE , TANIGUCHI AKIRA , BITO YOSHITAKA , YAMAMOTO ETSUJI
IPC分类号： A61B5/055 , G01R33/46
摘要： PURPOSE:To provide MRI numeral simulation method and apparatus which are effective as tool to develop a more sophisticated MRI apparatus by clarifying a nuclear resonance phenomenon. CONSTITUTION:A pulse sequence is generated at the step 401, image information of a specimen at the step 402 and information on characteristics of the apparatus at the step 403. At the step 404, a transient matrix is formed based on those obtained at the steps 401, 402 and 403. At the steps 405 and 406, a numerical computation and a calculation of MR signals according to the pulse sequence. At the step 405, a numerical computation section is formed to solve a Bloch's equation for each pixel to perform a calculation for magnetization. At the step 407, a processing such as fast Fourier transform is performed for the MR signal obtained at the step 405 to reconstruct an tomographic image of the specimen. The results are displayed at the step 408. This enables the realization of fast and highly accurate high performance MRI numeral simulation.

2. 发明专利

JPH05285140A 失效
公开(公告)号：JPH05285140A
公开(公告)日：1993-11-02
申请号：JP8857292
申请日：1992-04-09
申请人： HITACHI LTD
发明人： SHINOMURA RYUICHI , KATAKURA KAGEYOSHI , NAKATANI CHITOSE , NARENDORA SANGUBI
IPC分类号： A61B8/12
摘要： PURPOSE:To safely insert the device even into a minute part, while photographing the front of a catheter in a blood vessel by installing an ultrasonic transmitter/receiver in which the direction for transmitting or receiving an ultrasonic wave is varied by a signal frequency, and a guide wire hole, and providing them in the catheter. CONSTITUTION:Plural vibrator arrays 1, 1 are arranged symmetrically against the center shaft of a catheter 2, and they are held in a truncated chevron shape by an acoustic damping material 6. Also, the tip part of the catheter 2 is covered with a transparent protective material 10, and also, the part between each vibrator array 1, 1 is formed by an acoustic coupling material 8. On the other hand, an ultrasonic beam in the prescribed direction is absorbed by plural acoustic absorbers 3, 3. Also, each vibrator array 1, 1 is coupled to a signal processor of the outside of the catheter 2 by a signal line 9. Moreover, in the center shaft position of the catheter 2, a guide rail 5 consisting of a tube which a guide wire 4 passes through is provided. In this case, each scanning face 7, 7 of the ultrasonic beam is driven by the same or different center frequency, and scanned.

3. 发明专利

JPH05285131A 失效
公开(公告)号：JPH05285131A
公开(公告)日：1993-11-02
申请号：JP8857192
申请日：1992-04-09
申请人： HITACHI LTD
发明人： SHINOMURA RYUICHI , KATAKURA KAGEYOSHI , NAKATANI CHITOSE , NARENDORA SANGUBI
IPC分类号： A61B8/00
摘要： PURPOSE:To provide the ultrasonic device for picking up a target object such as a blood vessel, etc., with high resolution by driving an ultrasonic transmitter by a small number of signal lines, and scanning electrically an ultrasonic beam. CONSTITUTION:The ultrasonic device is provided with plural ultrasonic transmitter/receivers whose transmitting or receiving direction is varied by a signal frequency, and constituted so that at least two of them have different frequency characteristics. The ultrasonic transmitter/receiver is constituted of vibrator arrays 1, 2 inverted and polarized alternately. Also, this ultrasonic device is constituted by providing plural ultrasonic transmitter/receivers whose transmitting or receiving direction is varied by a signal frequency, and providing the ultrasonic transmitter/receivers in which at least two of them have different frequency characteristics in a catheter 11, and the ultrasonic transmitter/receiver is constituted of vibrator arrays 1, 2 inverted and polarized alternately. Accordingly, the target direction is scanned by a high frequency ultrasonic beam and a target object can be photographed with high resolution.

4. 发明专利

JPH05245128A 失效
公开(公告)号：JPH05245128A
公开(公告)日：1993-09-24
申请号：JP4823392
申请日：1992-03-05
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , TANIGUCHI AKIRA , YAMAMOTO ETSUJI , NAKATANI CHITOSE , ONODERA YUKARI
IPC分类号： A61B5/055 , G01R33/28 , G01R33/32
摘要： PURPOSE:To reduce a body motion artifact by calculating data for showing a body motion from projection data, correcting the projection data, based on its data, and correcting the body motion. CONSTITUTION:Projection data (nu, theta) (-pi/2

5. 发明专利

JPH05161654A ULTRASONIC DIAGNOSTIC DEVICE 失效
公开(公告)号：JPH05161654A
公开(公告)日：1993-06-29
申请号：JP33660491
申请日：1991-12-19
申请人： HITACHI LTD
发明人： MIWA YUICHI , MASUZAWA YUTAKA , NAKATANI CHITOSE , KIKUCHI TAKAFUMI , KONDO SHINICHI
IPC分类号： A61B8/14 , G01N29/06 , G06Q50/22 , G06Q50/24 , G06T1/00 , G16H10/60
摘要： PURPOSE:To provide the ultrasonic diagnostic device for deriving a position having the largest possibility that a point reflecting body exists, together with likelihood of its existence, from a point reflecting body image having an expansion of two dimensions on an ultrasonic tomographic image. CONSTITUTION:An ultrasonic receiving signal detected by a probe 2 passes through a parallel A/D converter 3 and is fetched to a CPU 5, and data of an ultrasonic tomographic image is sent to an image display device 6. From a luminance distribution of a closed loop area on an image designated by a point reflecting body area designating part 7, a secondary curve for approximating it is calculated by a point reflecting body position estimating part 8, its peak position is set as a point reflecting body position, and also, from the sum total of errors of the luminance distribution and the secondary curve, likelihood of the point reflecting body position is calculated. In such a way, the ultrasonic diagnostic device by which a user is not troubled for determining a position of a point reflecting body having an expansion of two dimensions on the tomographic image is provided.

6. 发明专利

JPH0367690B2 失效
公开(公告)号：JPH0367690B2
公开(公告)日：1991-10-23
申请号：JP1497682
申请日：1982-02-03
申请人： HITACHI LTD
发明人： OGAWA TOSHIO , KATAKURA KAGEYOSHI , ISHIKAWA KYOSHI , NAKATANI CHITOSE , KOIKE NORIO
IPC分类号： A61B8/00 , A61B1/00 , A61B1/04 , A61B8/12 , A61B10/00 , G02B23/24

7. 发明专利

JPH0294579A ELECTROSTRICTIVE PORCELAIN COMPOSITION FOR ULTRASONIC VIBRATOR 失效
公开(公告)号：JPH0294579A
公开(公告)日：1990-04-05
申请号：JP24412788
申请日：1988-09-30
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： MASUZAWA YUTAKA , SADAMURA SHIGERU , TAKEUCHI HIROYUKI , ITO YUKIO , NAKATANI CHITOSE
IPC分类号： C04B35/00 , C04B35/46 , H01L41/187 , H04R17/00 , H04R17/08
摘要： PURPOSE:To obtain a composite electrostrictive material made of electrostrictive porcelain composition and polymer substance and having high performance and an ultrasonic vibrator and an ultrasonic probe to be controlled at its electroacoustic conversion efficiency according to a bias electric field intensity by holding powder of specific porcelain composition in sheetlike polymer or vertically burying many fine columnar porcelains of the composition in the sheet face of the polymer. CONSTITUTION:The composition of an electrostrictive porcelain for an ultrasonic vibrator is generated by a general formula (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3, where 0.05

8. 发明专利

JPH01283979A ELECTRODE MADE OF COMPOSITE PIEZOELECTRIC MATERIAL AND FORMATION THEREOF 失效
公开(公告)号：JPH01283979A
公开(公告)日：1989-11-15
申请号：JP11243688
申请日：1988-05-11
申请人： HITACHI LTD
发明人： NAKATANI CHITOSE , TAKEUCHI HIROYUKI
IPC分类号： H01L41/45
摘要： PURPOSE:To prevent deterioration of an electrode by holding a composite piezoelectric material to a predetermined shape depending on the strength of the electrodes formed on the front of the composite piezoelectric material. CONSTITUTION:A composite piezoelectric material 101 is shaped and held depending on electrodes 104, 105 formed on the composite piezoelectric material 101. More specifically, since a sensor has a predetermined shape, so that when making a sensor using the composite piezoelectric material 101, the shape of the composite piezoelectric material 101 is made analogous to the shape of the sensor depending on the strength of the electrodes 104, 105. In this way, during the process of forming the sensor, it is not required that the composite piezoelectric material 101 be deformed. Accordingly, the electrodes made of the composite piezoelectric material can be prevented from deteriorating.

9. 发明专利

JPH01244683A MANUFACTURE OF COMPOUND PIEZOELECTRIC BODY 失效
公开(公告)号：JPH01244683A
公开(公告)日：1989-09-29
申请号：JP7148288
申请日：1988-03-25
申请人： HITACHI METALS LTD , HITACHI LTD
发明人： ARAI YASUO , SADAMURA SHIGERU , NAKATANI CHITOSE
IPC分类号： H01L41/45
摘要： PURPOSE:To enable the easy and efficient manufacture of compound piezoelectric body of high performance and high precision wherein electro-mechanical coupling-coefficient is large and acoustic impedance is small, by retaining pillar type piezoelectric members in an integrated body with an organic body compound of organic material. CONSTITUTION:On the upper surface of a PZT plate 10 of (t) thick, a plurality of trenches 12 intersecting with each other in the form of a mesh are formed, whose widths and depth are w1, w2 and d (d w1) are arranged at pitches 2p1, and a belt type conducting layer composed of conducting layer metal material is formed. Then the masking materials 15 are exfoliated and eliminated.

10. 发明专利

JPH01244682A MANUFACTURE OF COMPOUND PIEZOELECTRIC BODY 失效
公开(公告)号：JPH01244682A
公开(公告)日：1989-09-29
申请号：JP7148188
申请日：1988-03-25
申请人： HITACHI METALS LTD , HITACHI LTD
发明人： ARAI YASUO , SADAMURA SHIGERU , NAKATANI CHITOSE
IPC分类号： H01L41/45
摘要： PURPOSE:To enable easy and efficient manufacture of a compound piezoelectric body of high performance and high precision wherein electro-mechanical coupling-coefficient is large and acoustic impedance is small, by forming a piezoelectric board as a pillar type piezoelectric members of minute dimension, and retaining the pillar type piezoelectric members in an integrated body with an organic body compound of organic material. CONSTITUTION:On the upper surface of a PZT plate 10 of t0 thick, a plurality of trenches 11 intersecting each other in the form of a mesh are formed, whose width and depth are (w) and d1 (d1

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