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5050608 System for indicating a position to be operated in a patient's body
New Patents
5045791 NUCLEAR MAGNETIC RESONANCE IMAGING METHOD Etsuji Yamamoto, Hideki Kohno, Akishima, Japan assigned to Hitachi Ltd; Hitachi Medical Corporati A three-dimensional NMR imaging method using phase encoding field gradients along two direction is disclosed. The measurement of an NMR signal is repeated in such a manner that among all combinations of a plurality of magnitudes of gradient prepared for the phase encoding field gradient along one of the two directions and a plurality of magnitudes of gradient prepared for the phase encoding field gradient along the other direction, combinations in which the magnitude of the phase encoding field gradient along the one direction is not larger than a predetermined value, are selected preceding the remaining combinations. A first image reconstruction processing is performed for data trains acquired on the basis of the precedently selected combinations, thereby obtaining a crude image. The crude image is displayed to confirm whether the location of measurement is proper or not. After the confirmation, the remaining combinations are successively selected to continue the measurement of the NMR signal and a second image reconstruction processing is performed for all of data trains acquired, thereby obtaining a detailed image.
5050608 SYSTEM FOR INDICATING A POSITION TO BE OPERATED IN A P’ATIENT’S BODY Eij Watanabe, Shiny Manaka, Yukio Kosugi, Tokyo, Japan assigned to Medirand Inc An articulated arm has a plurality of arms connected to each other by joints. A pointer is connected to one of the plurality of arms. The arm nearest the poi:nter is the foremost arm of the articulated arm. .Angular displacement sensors are provided at joints of the articulated arm, for producing angular signals. Tomographical images of a patient’s body are displayed on a cathoderay tube. The angular signals are converted to tomographical position signals corresponding to the tomographical images on the cathode-ray tube. In response to the tomographical position signals, the position of the tip of the pointer is
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displayed on the cathode-ray tube with a mark. The system can be used, for example, in locating a position on a patient’s body where an operation is to be performed.
5050611 ULTRASONIC IMAGING APPARATUS Kinya Takamizawa, Makoto Hirama, Hironobu Hongo, Utsunomiya, Japan assigned to Kabushiki Kaisha Toshiba An ultrasonic imaging apparatus comprises an ultrasonic transducer for outputting ultrasonic beams and converting echo waves of the ultrasonic beams to a B-mode echo signal corresponding to a B-mode for obtaining a tomographic image and a D-mode echo signal corresponding to a D-mode for obtaining Doppler data, a transmitter circuit for driving the transducer for generating the ultrasonic beams for scanning a subject, a receiver circuit including a gain control circuit for controlling the gain of the B-mode and D-mode echo signals output from the ultrasonic transducer so that the level of the B-mode echo signal is made to equal to that of the D-mode echo signal and for outputting gain-controlled echo signals, and A/D converter for converting the gain-controlled signals to digital signals, and a delay/addition circuit for delaying the digital signals and adding them to output a received signal, a B-mode processor circuit for producing a B-mode image signal from the received signal, a D-mode processor circuit for producing Doppler data from the received signal, and a display for displaying the B-mode image signal and D-mode data.
5051698 NMR IMAGING SYSTEMS Roge Ordidge, Nottingham, United Kingdom assigned to National Research Development Corporation Enhanced NMR images of a desired portion of an object are obtained by obtaining a plurality of NMR responses of the object each response comprising information from a plurality of smaller volumes within the object and by combining together the plurality of NMR responses by addition or subtraction to obtain enhanced images from the selected smaller volumes.
5045791 NUCLEAR MAGNETIC RESONANCE IMAGING METHOD Etsuji Yamamoto, Hideki Kohno, Akishima, Japan assigned to Hitachi Ltd; Hitachi Medical Corporati A three-dimensional NMR imaging method using phase encoding field gradients along two direction is disclosed. The measurement of an NMR signal is repeated in such a manner that among all combinations of a plurality of magnitudes of gradient prepared for the phase encoding field gradient along one of the two directions and a plurality of magnitudes of gradient prepared for the phase encoding field gradient along the other direction, combinations in which the magnitude of the phase encoding field gradient along the one direction is not larger than a predetermined value, are selected preceding the remaining combinations. A first image reconstruction processing is performed for data trains acquired on the basis of the precedently selected combinations, thereby obtaining a crude image. The crude image is displayed to confirm whether the location of measurement is proper or not. After the confirmation, the remaining combinations are successively selected to continue the measurement of the NMR signal and a second image reconstruction processing is performed for all of data trains acquired, thereby obtaining a detailed image.
5050608 SYSTEM FOR INDICATING A POSITION TO BE OPERATED IN A P’ATIENT’S BODY Eij Watanabe, Shiny Manaka, Yukio Kosugi, Tokyo, Japan assigned to Medirand Inc An articulated arm has a plurality of arms connected to each other by joints. A pointer is connected to one of the plurality of arms. The arm nearest the poi:nter is the foremost arm of the articulated arm. .Angular displacement sensors are provided at joints of the articulated arm, for producing angular signals. Tomographical images of a patient’s body are displayed on a cathoderay tube. The angular signals are converted to tomographical position signals corresponding to the tomographical images on the cathode-ray tube. In response to the tomographical position signals, the position of the tip of the pointer is
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displayed on the cathode-ray tube with a mark. The system can be used, for example, in locating a position on a patient’s body where an operation is to be performed.
5050611 ULTRASONIC IMAGING APPARATUS Kinya Takamizawa, Makoto Hirama, Hironobu Hongo, Utsunomiya, Japan assigned to Kabushiki Kaisha Toshiba An ultrasonic imaging apparatus comprises an ultrasonic transducer for outputting ultrasonic beams and converting echo waves of the ultrasonic beams to a B-mode echo signal corresponding to a B-mode for obtaining a tomographic image and a D-mode echo signal corresponding to a D-mode for obtaining Doppler data, a transmitter circuit for driving the transducer for generating the ultrasonic beams for scanning a subject, a receiver circuit including a gain control circuit for controlling the gain of the B-mode and D-mode echo signals output from the ultrasonic transducer so that the level of the B-mode echo signal is made to equal to that of the D-mode echo signal and for outputting gain-controlled echo signals, and A/D converter for converting the gain-controlled signals to digital signals, and a delay/addition circuit for delaying the digital signals and adding them to output a received signal, a B-mode processor circuit for producing a B-mode image signal from the received signal, a D-mode processor circuit for producing Doppler data from the received signal, and a display for displaying the B-mode image signal and D-mode data.
5051698 NMR IMAGING SYSTEMS Roge Ordidge, Nottingham, United Kingdom assigned to National Research Development Corporation Enhanced NMR images of a desired portion of an object are obtained by obtaining a plurality of NMR responses of the object each response comprising information from a plurality of smaller volumes within the object and by combining together the plurality of NMR responses by addition or subtraction to obtain enhanced images from the selected smaller volumes.