Abstract: In a power Doppler ultrasonic blood flow display apparatus, according to a moving signal Z representing moving of a blood flow display region, display changing means comprising changers (77, 78) and a change controller (79) displays a B-mode image also to a blood flow display region (84) while the blood flow display region (84) is moved, and displays a blood flow image when the moving of the blood flow display region (84) is stopped. Consequently the B-mode image of the target can be easily caught even while the blood flow display region is moved.

Abstract: Method and apparatus for generating Doppler sounds, even when there are segmented Doppler modes, wherein I and Q components of a Doppler signal are respectively converted into left and right sound signals in accordance with Hilbert transformation, then, a segmented waveform, interposed between zero crossing points of the left and right sound signals, is take out so as to created a positive side segmented waveform, obtained by rendering the sign of the segmented waveform positive, and so as to create a negative side segmented waveform, obtained by rendering the sign of the segmented waveform negative, then, respective pairs of positive side segmented waveforms and negative side segmented waveforms of respective segmented waveforms are made continuous in order of appearance of the segmented waveforms so as to create double lengthened sound signals which are then joined to produce a continuous sound signal.

Abstract: An ultrasonic diagnostic method and apparatus are provided for enhancing real-time performance, enlarging visual field, and improving S/N ratio without sacrificing any of real-time performance, visual field and S/N ratio by field into two or more sections; generating sounding waves forming a main lobe and grating lobes to scan the sections of the visual field respectively by the main lobe and the grating lobes; separately and directively processing an echo wave received along the direction of the main lobe and echo waves received along the directions of the grating lobes to form images of the sections separately; and combining the images of the sections to display an image of the visual field.

Abstract: A method for quantitatively determining bone mineral mass by a CT system, comprising scanning an objective region together with a plurality of samples produced by mixing a water equivalent material with various ratios of a standard material equivalent to bone mineral mass and determining the bone mineral density of the objective region with reference to the CT numbers of the samples, wherein a plurality of samples are scanned together with the objective region at one or multiple levels of tube voltage and a corrected CT number of each sample is calculated by substituting the CT number of each of the samples with the CT number of blood or a standard material equivalent to blood. By scanning at a single level of tube voltage, bone mineral density is determined, on the basis of the CT number of the objective region and with reference to the corrected CT numbers.

Abstract: An object of the present invention is to provide an ultrasonic diagnostic apparatus, which detects a moving part and a stationary part within the same frame and selects a suitable arithmetic averaging coefficient for each of them and thereby keeps well its characteristic to follow up an image and maintains its capability to reduce noises sufficiently. The invention attaining the above mentioned object is characterized by that it comprises:a frame memory for storing old data which are signals received on a previous occasion;a weighting function generator obtaining, for each pixel, differential data as the absolute value of the difference between new data, which are signals currently input thereto, and old data read from the frame memory for calculating arithmetic-averaging coefficients ".omega." and "1-.omega." as weighting functions, which are functions of the new data or the old data and the differential data;a new data multiplier for multiplying, for each pixel, the new data by the data "1-.omega.

Abstract: An object of the present invention is to eliminate the bad effect on the image quality caused by the production of a sharp difference in signal strength at the DC view due to the T2 relaxation and to prevent the contrast of the MRI image from becoming a mixture of different multiple contrasts. The DC view is shifted to become a view virtually in the middle of one block by adding an offset phase gradient amount to each phase gradient and, further, the low-frequency region is arranged to be contained in one block.

Abstract: This invention provides an RF drive circuit of MR apparatus capable of controlling the drive voltage of the RF coil, inclusive of the correction of the quadrature balance. The RF drive circuit for quadratically driving the RF coil of MR apparatus comprises a voltage monitor means for monitoring the voltages on the 0.degree.-port and 90.degree.-port of the RF coil, a feedback voltage generation means for producing, from the monitored voltages on the 0.degree.-port and 90.degree.-port, a feedback voltage that corresponds to a component of a revolving magnetic field formed in the RF coil, with the magnetic field component being in the field revolving direction and coupling with a spin system, and a drive voltage control means for controlling, based on the feedback voltage, the drive voltage to be applied to the RF coil.

Abstract: In an ultrasonic diagnostic apparatus which uses at least part of an array of a plurality of ultrasonic vibrators as an aperture for ultrasonic beam formation, sends ultrasonic waves into an object, receives echoes from the object, delays the output echo signals of a plurality of vibrators participating in receiving the echoes by a given quantity, adds up the delayed echo signals for echo beam forming, and forms a picture of an internal structure of the object by using the signals obtained by echo beam forming, the echo beam forming is characterized by forming a plurality of partial apertures in an aperture of an array of ultrasonic vibrators, delaying the echo signals provided by groups of vibrators included in the plurality of partial apertures by a given quantity determined so that a plurality of echo beams having a common focal point are formed, adding up the delayed echo signals of each group, detecting the respective sums of the delayed echo signals of the groups, and adding up the respective detected s

Abstract: The invention realizes a double type coil used as a slant coil to generate a slant magnetic field for MRI, and the double type coil has small impedance and short length in comparison with the prior art. According to the invention, current path patterns constituted by a current path in spiral shape and a plurality of current paths in horseshoe shape surrounding the spiral path are formed respectively on the double semi-cylinder surfaces having the axis commonly. Directions of spirals on the two cylinder surfaces are opposite to each other. In the plural horseshoe-shaped paths on the two cylinder surfaces, a circuit is opened at the end on the same side of the cylinder. These current paths are all connected in series over the two surfaces thereby one current path is formed.

Abstract: An NMR imaging method for imaging with isotropic pixel resolution and a short scan time by applying a non-square scan matrix matched to the sectional shape of a subject, wherein a non-square scan matrix is set with different vertical and horizontal dimensions corresponding to the sectional form of a subject and scan data is collected under two-dimensional Fourier transformation by setting the longer sides of the matrix in the direction of projection and the shorter sides in the warp direction, while simultaneously displaying an image in a non-square image matrix wherein a length corresponds to projection width A on one side and whose length corresponds to M/N time of projection width A (where M: number of view, N: number of sample in the direction of projection, and M<N) on the other.

Abstract: An object of the present invention is to realize a radiotherapeutic system whereby the process from the stage of making a diagnosis of a body to be examined for obtaining information of position, size, shape etc. of the diseased part and making up a therapeutic plan of such items as the area to be irradiated by a radiation to the stage of positioning of the area to be irradiated on the body being examined and applying the radiation to the body can be reasonably executed with little trouble.

Abstract: An image forming apparatus is capable of starting image reconstruction simultaneously with the start of scan. A pipe-line system image forming apparatus having an intermediate buffer between a date acquition device and an image reconstruction device, and the apparatus is characterized in that there is provided a path for supplying data from the data acquisition device directly to the image reconstruction device, whereby the first scan data is sent also to the image reconstruction device simultaneously with sending data to the intermediate buffer so as to immediately start image reconstruction according to the scan data.

Abstract: An object of the present invention is to obtain an ultrasonic diagnostic apparatus including a CFM system which is designed so that the algorithm for computing a flow velocity or the like can be changed easily.The ultrasonic diagnostic apparatus according to the present invention comprises an A/D converter that converts a Doppler signal obtained by coherent detection of the echo reflected from an object of inspection into a digital signal, and a flow velocity computing section that determines a blood flow velocity and velocity dispersion on the basis of the Doppler signal from the A/D converter. The flow velocity computing section includes an MTI filter and a computing unit that determines a blood flow velocity and velocity dispersion by processing an output signal from the filter, both the MTI filter and the computing unit comprising respective digital signal processors (DSPs).

Abstract: An image reconstruction process and apparatus, for obtaining a two-dimensional enlarged image of high quality, without causing unnecessary increase in the quantity of calculations; wherein data in a frequency space is filtered with a filter having frequency characteristics of an inverse function of an amplitude-transmitting function to be performed thereafter, then image reconstructing the data obtained through the filtering process to provide image reconstruction data; interpolating the image reconstruction data at interior division points of 1:3 and 3:1 of adjacent data; and forming image display by using the interpolated image reconstruction data as the image display data.

Abstract: A method in accordance with the present invention which can make a load imposed on a computer lighter in the case of carrying out the deconvolution processing by use of the computer even when the range of a blur is due to the X-rays radiated from afocal points, wherein the method is characterized by producing data of each channel of an X-ray detector by the weighted addition of the data measured from alternating channels selected from a plurality of channels proceeding and a plurality of channels succeeding the concerned channel.

Abstract: An object of the invention is to provide imaging method of separation of water and fat in MRI wherein separation error due to unevenness of the magnetic field or the like is removed and the quantitativeness exists. The invention is characterized in that S.sub.o scan with phases of magnetization vectors of water and fat being coincident at the spin echo signal receiving state, S.sub.1 scan with phases of the magnetization vectors being different by 180.degree., and S.sub.2 scan with phases of the magnetization vectors being different by 90.degree. are performed, and quantitative difference of water and fat is calculated from the image data of the S.sub.1 scan and the S.sub.2 scan and a separation image of water and fat is obtained from the absolute value image of the S.sub.o scan and the S.sub.1 scan. According to the invention, since the absolute value images of the S.sub.o scan and the S.sub.

Abstract: An ultrasonic diagnostic device according to the present invention in which a driving mechanism for driving vibrators in an opening port for the transmission of ultrasonic waves with weighting can be the one of low cost and low heat loss is characterized in that a plurality of driving signals for driving a plurality of vibrators in an opening port for the transmission of ultrasonic waves are made to have different waveforms from each other for weighting.

Abstract: The present invention for realizing an ultrasonic diagnosis apparatus for displaying a high-quality image having a smaller amount of speckle noise is characterized in that receiving signals of a plurality of sound rays each having a different directionality within a range of bearing resolution of an ultrasonic beam are subjected to correlation processing to determine a receiving signal for the portion of one sound ray, and an image is formed on the basis of receiving signals thus determined, thereby eliminating speckle noise. Correlation processing in its simplest form may be addition averaging processing.

Abstract: The method for restricting a region for magnetic resonance imaging, in accordance with the present invention, comprisinga step of measuring a spin-echo signal from an object by a pulse sequence of Fourier transformation technique;a step of measuring a spin-echo signal from an object by a pulse sequence comprising adding a selective 180.degree..+-.x pulse and a selective 180.degree..+-.y pulse following a 180.degree. pulse in the pulse sequence of Fourier transform technique, the integral of gradient magnetic fields for selection thereof being 0; anda step of reconstructing an image from the addition or subtraction between the spin-echo signals measured by the two sequences.

Abstract: An ultrasound diagnosing device in which resolving power becomes uniform in a direction orthogonal to a scanning direction of sound rays over a wide range from the shallow to the deep. Ultrasound signals are transmitted and received by changing combination of the arrays associated with transmission and/or receiving of the ultrasound waves depending on a depth of an object for observation by using an ultrasound probe incorporating a plurality of unidimensional arrays of a plurality of ultrasound oscillators arranged in parallel and an acoustic lens having intrinsic focal points for every array on the side of an ultrasound radiation face of these arrays.