Abstract: A raw data space or k-space having a frequency encoding axis and a phase encoding axis orthogonal to each other are divided into three regions in the direction of the phase encoding axis which are composed of a central region and two side regions on both sides of the central region. The central region is occupied by one of an even-numbered echo group and an odd-numbered echo group, while each of the side regions is occupied by the other echo group. Thereby, artifacts are reduced which are caused by moving or flowing spins.

Abstract: A specific region extraction method of a medical image includes a step of displaying an image selected by a user from among a plurality of tomographic plane images aligned in a predetermined direction, on a display, generating a plurality of sectional plane images by designating a plurality of sectional positions for the tomographic plane image displayed, tracing a profile of a focus in each sectional plane image by using a data input device by a user, and determining profile data of a specific region in each tomographic plane image using coordinates of pixel data extracted by the tracing operation by interpolation.

Abstract: An X-ray TV camera apparatus having a function to switch a visual field of an X-ray image, comprising an X-ray generating apparatus, an image intensifier for converting X-ray information by an X-ray which was generated from the X-ray generating apparatus and passed through an object to be examined into an optical image, a TV camera for converting the optical image from the image intensifier into the video signal, a switch to switch the visual field of the X-ray image on the image intensifier, and a correcting circuit to shading correct the video signal so that the video signal from the TV camera gives a uniform image in accordance with the visual field switched by the switch.

Abstract: An X-ray imaging apparatus is constructed with a combination of an X-ray image intensifier, a relay optical system, and a video camera with avalanche multiplication camera tube. The video camera is controlled by an image acquisition circuit, a synchronizing signal generation circuit, and an applying voltage control circuit. The applying voltage control circuit for controlling the voltage to be applied to the video camera with avalanche multiplication camera tube controls the applying voltage on the basis of image data in an image memory so that the gray scale level of a detected visible image is corrected.

Abstract: Radiation is generated toward a patient. A radiographic region of the radiation covers a predetermined field-of-view. Both of a stereotactic radiation producing filter and a radiographic radiation producing filter are transported in such a way that the stereotactic radiation producing filter and the radiographic radiation producing filter sequentially intercept the beam axis between the patient and a generation position for the radiation. When the stereotactic radiation producing filter is located on the beam axis, it forms the radiation into radiation required for stereotactic radiosurgery. When the radiographic radiation producing filter is located on the beam axis, it forms the radiation into radiation required for radioscopy. Radiation present within the radiographic region is detected with employment of a radiation detecting unit positioned opposite to the generation position of the radiation with respect to the patient.

Abstract: A radiation detector providing with a multi-channels photodiode formed on a substrate and having its individual channels isolated from each other by a plurality of channel isolation lines respectively, a scintillator cut along the channel isolation lines to be formed with a plurality of grooves into which a plurality of isolation plates isolating the individual channels from each other are inserted respectively, and a light shield coated on or bonded to each of both ends of the scintillator located in the direction of groove cutting.

Abstract: An ultrasonic diagnostic apparatus includes a circuit for detecting a portion which changes more than a predetermined magnitude in the received echo signal, the portion being a changing point corresponding to a measurement point to be measured within the inspected object, a circuit for measuring an elapsed time until the changing point is detected from a timing point at which the echo signal is detected, a circuit for obtaining luminance values in correspondence with the elapsed time as display luminance values of the measurement point, and a circuit for displaying the measurement point within the inspected object by the luminance values thus obtained.

Abstract: In a magnetic resonance imaging apparatus, picture quality of a tomographic image is prevented from deteriorating by reducing the influence due to a change in environmental magnetic field around magnetic field generating means. A phase correcting circuit for correcting the phase of a correcting current supplied to correcting magnetic field coils is provided in a correction control circuit which amplifies a detection signal representative of the change in the environmental magnetic field from a magnetic field sensor. This enables to correct the phase of a correcting magnetic field generated from the correcting magnetic field coils. The difference between the phase of the change in the environmental magnetic field and the correcting magnetic field generated by the correcting magnetic field coils can be reduced.

Abstract: In an illuminating method for nuclear magnetic resonance inspection, the progress of inspection is visually informed to a patient so that the patient can easily and surely keep himself or herself at rest during a scanning period, thereby improving accuracy of the inspection and allowing the patient to feel more at ease. Control signals indicating the progress of inspection are supplied from a control circuit to an illumination control circuit. The illumination control circuit changes, based on the control signals, the intensity, color, etc. of light emitted from a magnet cavity illuminating panel in accordance with the progress of inspection. It is thus possible to visually inform the patient of the progress of inspection, improve accuracy of the inspection, and illuminate a magnetic field generating space for suppressing a feeling of uneasiness felt by the patient.

Abstract: An ultrasonic diagnostic apparatus has a probe having a plurality of channels, a receiving circuit for dividing receiving signals from the probe to deliver them in the form of "K" (K being an integer which is 2 or more) blocks each having a predetermined number of channels, a selector circuit for selecting signals corresponding to respective ones of the blocks from output signals of the receiving circuit and delivering the selected signals, a signal distributor for selecting the output signals of the receiving circuit in the mode of single beam reception and selecting the output signals of the selector circuit in the mode of simultaneous parallel beam reception, "K" delay circuits connected to outputs of the signal distributor and each having the predetermined channels, and a switch for switching the "K" delay circuits to series connection in the mode of single beam reception and switching the "K" delay circuits to parallel connection in the mode of simultaneous parallel beam reception.

Abstract: An X-ray fluorograph and radiograph apparatus including an X-ray television camera having an avalanche multiplication operation type image pick-up tube having an input/output characteristic in which increment of an output reduces gradually against increase of dose of incident X-rays and a unit for setting X-ray latitude and a multiplication factor of an image pick-up tube to optimum values for inputted radiograph conditions by controlling a voltage value applied to the image pick-up tube and a value of a stop of an optical system, and making it possible to obtain X-ray latitude at 1,000 or more.

Abstract: A plurality of Doppler image data corresponding to a plurality of sliced planes of an object which are different from one another, respectively, are received. The plurality of Doppler image data shows distributions of first and second moving directions and moving velocities of a moving substance in the object on the plurality of sliced planes, respectively. First and second data showing distribution corresponding to each of a plurality of velocity ranges of the moving velocities among the distribution of the first and second moving direction, respectively, of the moving substance on each of the sliced planes is obtained based on the Doppler image data. Each of first and second three-dimensional image data is obtained based on the data corresponding to each of the plurality of velocity ranges and also corresponding to all of the plurality of sliced planes among all of the first and second data, respectively.

Abstract: RF coils for a nuclear magnetic resonance device having following features separated or combined at an intersecting portion of two conductive loops disposed so that sensitive directions thereof are substantially perpendicular to a direction of a static magnetic field and that the conductive loops intersect each other with a predetermined interval; (1) conductors of conductive loops are narrowed; (2) neighborhood of intersecting portion is grounded; and (3) a member having a small dielectric constant is put inside of an intersecting portion.

Abstract: The present invention relates to an ultrasonic probe to be inserted into the body of a subject for image-processing a diagnostic target thereof by ultrasonic waves transmitted to and received from the inside of the body and, more particularly, to an internal examination ultrasonic probe which can be directly installed on a palpation finger. The ultrasonic probe includes a transducer array for transmitting and receiving the ultrasonic waves; a housing for supporting the transducer array, which housing is provided with a device for installing a fingertip of an operator therein; and electric wiring members connected to the transducer array and extending from the housing to the outside so that transmission and reception signals of the ultrasonic waves are supplied therethrough.

Abstract: A nuclear magnetic resonance apparatus receives nuclear magnetic resonance signals from an object under test with an RF probe which is an array of coils, implements down-frequency conversion with frequency converters for the received signals in multiple channels such that the frequency bands of the converted signals do not virtually overlap, filters the converted signals with band pass filters each operating to cut off frequency bands of other channels, hybridizes the filtered signals of multiple channels to form a hybridized signal, and produces an image from the hybridized signal.

Abstract: An ultrasonic Doppler blood flow measuring apparatus comprises a plurality of frame memories for storing information pieces about a blood flow speed in a unit of frame, circuits for comparing blood flow speed information pieces at corresponding addresses on the plurality of frame, memories and determining a speed difference, a circuit for comparing the speed difference with a predetermined threshold value and determining a blood flow at the corresponding address as an arterial flow when the speed difference exceeds the threshold value but as a venous flow when the speed difference is below the threshold value, and a circuit for displaying the determined arterial and venous flows in different colors.

Abstract: A stereotactic radiosurgery including a collimator adapted movably to an irradiation head, a driving apparatus for changing a position of the collimator while keeping a position relation in which a center line of a hole of the collimator coincides with a line connecting an apex of a radiation cone and a center portion of the focus, and a control apparatus for detecting a position error between an irradiating direction of the radiation and the center portion of the focus, driving the collimator driving apparatus and moving the collimator to a position at which the detected position error is offset.

Abstract: A gradient magnetic field irradiation method comprising irradiating RF pulses and a slice plane selection gradient magnetic field to excite an atomic nucleus of a slice plane, irradiating then first, second and third frequency encoding gradient magnetic fields under the following condition and receiving NMR signals during the irradiation of the third frequency encoding gradient magnetic field:(A) (1/k)-(4/n)+1=0where a ratio of intensity of the first, second and third frequency encoding gradient magnetic field is k:n:1;(B) the irradiation time of the first and second frequency encoding gradient magnetic fields is T/k and 2T/n, respectively, when the irradiation time of the third frequency gradient magnetic field is 2T; and(C) a time interval between the start timing of the irradiation of the first frequency encoding gradient magnetic field and the start timing of the irradiation of the second frequency encoding gradient magnetic field is equal to a time interval between the start timing of the irradiation of

Abstract: A multi-elements radiation detector provides isolation plates each having a uniform light reflectance on the surface, excellent reproducibility and uniform performance for enhancing an X-ray spatial efficiency and a light transmission efficiency and is intended to improve a detection efficiency and an S/N of a reconstructed image so that the detector may be used for a digital X-ray imaging system, in particular, an X-ray computed tomography system. In the multi-elements radiation detector, each isolation plate isolating the adjacent elements from each other includes a thin plate made of Mo. On the surfaces of the thin plate, there are provided organopolysiloxane membranes obtained by hydrolyzing and condensing organosilicate such as CH.sub.3 Si(OCH.sub.3).sub.3 so that those surfaces are formed to be specular-reflective. On the films, there are formed reflective multi optical thin films composed of a combination of Al, MgF.sub.2 and TiO.sub.3.

Abstract: A frequency transfer type phase adjustment apparatus for frequency-transferring a plurality of reception signals derived from arrayed ultrasonic transducer elements into low frequency components by mixing these reception signals with a reference signal, and for applying delays to these low frequency components so as to be summed with each other, comprises small delay circuits for applying very short delays to the respective reception signals before being frequency-transferred; and a quantizing delay circuit for applying delays obtained by multiplying a delay time unit by an integer, to the respective reception signals after being frequency-transferred. A ratio of the delay time unit to one-cycle period of the reference signal is equal to an integer ratio. Phase shifters are inserted into either the output sides or the input sides of the mixers for the respective signal channels used for the frequency transfer operation.