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.