专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

81. 发明专利

JP2002034950A MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR TRANSMITTING DATA THEREOF 失效
公开(公告)号：JP2002034950A
公开(公告)日：2002-02-05
申请号：JP2000224151
申请日：2000-07-25
申请人： TOSHIBA CORP
发明人： HOSHINO TSUTOMU , KUHARA SHIGEHIDE
IPC分类号： G01R33/28 , A61B5/055 , G01R33/32 , G06T1/00
摘要： PROBLEM TO BE SOLVED: To transmit image data from a data collecting device to a host computer at high speed even when the display frame rate is controlled by the data transmission, and to increase the number of images displayed per unit time. SOLUTION: Data are collected and restructured as an image in a data collecting/restructuring device 11, and the post-treatment is applied to the image data. Then the post-treated image data are compressed and transmitted to the host computer 12 via a data bus 14. The compressed data transmitted via the data bus 14 are depressed in the host computer 12, and the pre-treatment before display is applied to the depressed image data to be displayed.

82. 发明专利

JP2001327480A MAGNETIC RESONANCE IMAGING INSTRUMENT 失效
公开(公告)号：JP2001327480A
公开(公告)日：2001-11-27
申请号：JP2001065256
申请日：2001-03-08
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE
IPC分类号： G01R33/48 , A61B5/055
摘要： PROBLEM TO BE SOLVED: To reduce N/2 artifacts and bloodstream artifacts without sacrificing imaging time and S/N in an image picking-up method using multiple echoes. SOLUTION: A magnetic resonance imaging instrument is provided with a transmission coil 2 which generates an RF pulse to a subject existing in a static magnetic field, a gradient coil 3 which generates a gradient magnetic field pulse, and a sequence control section 10 which excites the nuclear spin of the subject one time with the RF pulse and, continuously, controls the coils 2 and 3 to continuously generate a plurality of echoes. The imaging instrument is also provided with a plurality of independent reception coils 41 and 42 which receive the echoes and a computer 12 which generates a plurality of odd numbered images respectively corresponding to the reception coils 41 and 42 based on the odd numbered echoes contained in the received echoes, a plurality of even numbered images respectively corresponding to the coils 41 and 42 based on the even numbered echoes contained in the received echoes, a first image by synthesizing the plurality of odd numbered images based on the plurality of sensitivity distributions of the coils 41 and 42, and a second image by synthesizing the plurality of even numbered images based on the sensitivity distributions.

83. 发明专利

JP2001178698A OPEN TYPE MAGNETIC RESONANCE INSTRUMENT 失效
公开(公告)号：JP2001178698A
公开(公告)日：2001-07-03
申请号：JP36617999
申请日：1999-12-24
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE , SUGIMOTO HIROSHI
IPC分类号： A61B5/055 , G01R33/383 , G01R33/385
摘要： PROBLEM TO BE SOLVED: To provide an open-type magnetic resonance instrument in which an operator can easily approach a patient when the patient performs paracentesis treatment, etc. SOLUTION: A lower magneticity generating means for generating a magnetostatic field in the open type magnetic resonance diagnosing device is made to be smaller than an upper magneticity generating means, or the lower magneticity generating means is eliminated so that a footstep part is arranged on the side surface of a frame lower part 13.

84. 发明专利

JPH0884709A MAGNETIC RESONANCE VIDEO APPARATUS 失效
公开(公告)号：JPH0884709A
公开(公告)日：1996-04-02
申请号：JP22068294
申请日：1994-09-14
申请人： TOSHIBA CORP
发明人： MORI KIYOMI , KUHARA SHIGEHIDE
IPC分类号： G01R33/385 , A61B5/055
摘要： PURPOSE: To keep rising time and falling time of electric current constant by arranging a gradient magnetic field power source for supplying power to a gradient magnetic field coil to accumulate the power supplied from a power source unit by a plurality of power accumulation means. CONSTITUTION: A capacitor for resonance which is charged with a proper voltage is selected with an S4 from among capacitor banks 3b. An input waveform different in amplitude between the same amplitude side on a positive/negative basis and the same polarity side on the positive/negative basis is inputted into a gradient magnetic field amplifier 3a from a pulse generation source 21 and S2 and S3 are turned ON. Here, electric current rises at a time constant determined by resonance conditions of the capacitor for resonance and a gradient coil L1 and when it reaches a desired current value, the S2 is turned OFF. With this OFF operation, the current flows to a D1 and the S3 and furthermore, the S3 is turned Off at a specified time so that electromagnetic energy stored in the gradient coil L1 is accumulated again in the capacitor C4 for resonance as electric charge energy. This allows the keeping of the rising and falling time of the electric current constant.

85. 发明专利

JPH0871058A MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPH0871058A
公开(公告)日：1996-03-19
申请号：JP21298494
申请日：1994-09-06
申请人： TOSHIBA CORP
发明人： KANAYAMA SHOICHI , CALDERON ARTURO , KASAI YOSHIMORI , KUHARA SHIGEHIDE
IPC分类号： G01R33/48 , A61B5/055 , G01R33/56 , G01R33/563 , G01N33/48
摘要： PURPOSE: To form an image of brain function, an image of a blood vessel and an image of a shape in a short time by providing a plurality of data collecting means for collecting respectively data emphasizing a signal from a blood flow part, data obtaining an information on the shape of a subject to be inspected and data emphasizing the change in ununiformity of a magnetic field caused by the change in the amt. of blood flow. CONSTITUTION: A magnetic resonance signal received by a probe 9 is detected in a receiving part 11 and then, it is input into a electronic computor 13 through a data collecting part 12 and reconstituting processing of an image is performed. In this case, an RF pulse and a slice gradient magnetic field are applied to selectively excite a subject to be inspected. Then, field echos are successively generated by switching of the read gradient magnetic field and an image emphasizing the change in ununiformity of the magnetic field is obtd. by the third echo wherein a long transverse relaxation time for obtaining a contrast emphasizing a parameter reflecting the change in phase of a nuclear spin is obtd. In addition, a shape image is formed by using the second echo utilizing an empty time during the third echo collection.

86. 发明专利

JPH07184879A MAGNETIC RESONANCE VIDEO SYSTEM 失效
公开(公告)号：JPH07184879A
公开(公告)日：1995-07-25
申请号：JP34704793
申请日：1993-12-27
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE
IPC分类号： G01R33/48 , A61B5/055 , G01N33/48
摘要： PURPOSE:To photograph an image of blood vessel and an image of brain function in a short time and to discriminate easily a cortex part and a vein part by collecting data wherein a signal from a blood vessel part is emphasized or data wherein change in ununiformity of a static magnetic field is emphasized and data wherein change in ununiformity of a magnetic field is emphasized. CONSTITUTION:A magnet 33 of a static magnetic field and an inclined coil 35 are respectively driven by an electric source 34 and a driving electric source 36. A uniform static magnetic field and an inclined magnetic field, having a linear inclined magnetic field distribution being in the same direction as the static magnetic field and in three directions being at right angles each other, are loaded thereby on an examine to be inspected 37. A high-frequency signal is transmitted to a probe 39 from a transmitting part 40 and a high-frequency magnetic field is loaded on the examine to 37. After rectangular phase detection of a magnetic resonance signal received by the probe 39 is performed in a receiving part 41, the signal is transferred to a data collecting part 43 and, after A/D conversion is performed, it is transferred to an electronic computer 44. In the electronic computer 44, image reconstitution processing is performed based on the magnetic resonance signal transmitted from the data collecting part 43 and the image obtd. is displayed on a display 46.

87. 发明专利

JPH02149250A MAGNETIC RESONANCE IMAGE DEVICE 失效
公开(公告)号：JPH02149250A
公开(公告)日：1990-06-07
申请号：JP30246888
申请日：1988-11-30
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE , SATO KOZO
IPC分类号： G01R33/44 , A61B5/055 , G01R33/48 , G01R33/561
摘要： PURPOSE:To enable very high speed imaging with high resolution by generating a gradient echo at both sides of a spin echo and pertinently setting at least one of an encoding step amount (interval on Fourier space) and the sequence thereof. CONSTITUTION:In order to excite selectively the magnetization of a target slice portion in a subject 5, slicing gradient magnetic field Gs in a (z) direction is applied, using a gradient electric field generation coil 3 via a drive circuit 4 and a 90-degree selection excitation pulse as high frequency electric field RF is added with a probe 7 via a transmitter part 8 in the condition. The predetermined core magnetization of the specific slice portion in the subject 5 is selectively excited and magnetic resonance is thereby generated. Furthermore, the pulse width of gradient magnetic field Ge for phase encoding immediately after the spin echo is made a half of the pulse amplitude of the gradient magnetic filed Ge for phase encoding. According to the aforesaid construction, decoder density is doubled and it is unnecessary to extend time required for data collection.

88. 发明专利

JPH01238848A MAGNETIC RESONANCE IMAGE DEVICE 失效
公开(公告)号：JPH01238848A
公开(公告)日：1989-09-25
申请号：JP6356988
申请日：1988-03-18
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE
IPC分类号： G01R33/44 , A61B5/055 , A61B10/00 , G01N24/08 , G01N33/48 , G01R33/48
摘要： PURPOSE:To correct picture distortion, by a method wherein each pixel value is displayed by means of an absolute value. CONSTITUTION:Since a magnetic resonance image device has a picture value divided into a Real part and an Imaginary part by means of a phase error in an encode direction due to movement of an object, display is made by means of an absolute value. As a result, an ultrahigh speed magnetic resonance image picture having decreased picture distortion due to movement of an object can be formed.

89. 发明专利

JPS6486960A MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPS6486960A
公开(公告)日：1989-03-31
申请号：JP24435787
申请日：1987-09-30
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE
IPC分类号： A61B10/00 , A61B5/055 , G01N24/08 , G01R33/48
摘要： PURPOSE:To remove the strain of an image by the waveform of a gradient magnetic field at the time of high speed imaging, by reconstituting an image on the basis of the sampling data of a magnetic resonance signal obtained during a steady period except the periods of the rising and falling parts of a reading gradient magnetic field. CONSTITUTION:A static magnetic field magnet 1 and a gradient magnetic field forming coil 3 uniformly apply a static magnetic field and a gradient magnetic field to an object 5 to be examined. A high frequency magnetic field is further applied to the object 5 to be examined from a probe 7 under the control of a system controller 10 and the echo signal received by the probe 7 is sent to a computer 12 to be subjected to image reconstituting processing and displayed on an image display 14. The switching waveform of a reading gradient magnetic field generates waveform at rising and falling parts to become the strain of an image. The reconstitution of an image is performed only during a steady period except the rising and falling parts. As a result, a good reconstituted image having no strain is obtained.

90. 发明专利

JPS6486959A MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPS6486959A
公开(公告)日：1989-03-31
申请号：JP24435687
申请日：1987-09-30
申请人： TOSHIBA CORP
发明人： KUHARA SHIGEHIDE
IPC分类号： G01R33/32 , A61B5/055 , A61B10/00 , G01R33/44 , G01R33/48 , G01R33/561 , G01R33/565
摘要： PURPOSE:To obtain a good image by the simple control of a system, by detecting and storing the peak positions of a plurality of echo signals in such a state that a phase encoding gradient magnetic field is not applied and reconstituting an image on the basis of a predetermined number of sampling data centering around said positions. CONSTITUTION:When a sequence for high speed imaging is performed in such a state that no phase encoding gradient magnetic field is applied, an echo signal of a similar waveform is obtained at every reversal by the switching of a reading gradient magnetic field and the peak position of the echo signal is detected. When this peak position is stored and a predetermined number of sampling data are used in the reconstitution of an image centering around said peak position, a correct reconstitution result is obtained even when the peak position is shifted. When feedback is applied to the drive source of a gradient magnetic field forming coil 3 on the basis of the peak position to automatically adjust the timing or positive/negative amplitude value of the switching of a reading gradient magnetic field, offset or the like, a peak interval becomes constant. Therefore, the complicated control of the system is unnecessary and a correct reconstituted image is obtained.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式