Abstract: The MR imaging apparatus for quantifying a microscopic motion in a tissue of a patient comprises a magnet, a gradient coil, a gradient power source, an RF coil, an RF coil, a transmitter, a receiver, a sequencer and a computer system. The sequencer comprises an encoding variable circuit for varying a number at which same phase encoding gradients are repeatedly applied. The encoding variable circuit preferably varies a number of applying so that a number of applying around the phase encoding gradient zero is more than a number of applying out the phase encoding gradient zero. The computer system comprises a sampling circuit for sampling the echo data as multiple echo data by each phase encoding gradient. The computer system further comprises an averaging circuit for averaging the multiple echo data by each phase encoding gradient and a calculating circuit for calculating a predetermined coeffcient related to the microscopic motion using the averaged echo data.

Abstract: An image interpolation apparatus receives an image signal in the frequency domain. The image signal is supplied to a filter circuit. The output of the filter circuit is transformed by a two-dimensional fourier transformation circuit into a filtered image signal in the spatial domain. The filtered image signal is linearly interpolated by an interpolation circuit to enlarge or reduce the image representing the image signal. The filter circuit, the fourier transformation circuit and the interpolation circuit are under the control of a processor. The processor sets the filter circuit a filter function representing the inverse of the modulated transfer function of the interpolation circuit to compensate for the degradation caused by the modulated transfer function of the interpolation circuit.

Abstract: A three-dimensional image processing apparatus includes a first three-dimensional memory for storing first voxel data representing a three-dimensional CT image, a level detector for comparing the first voxel data with CT values of an epidermis, a bone, and a blood vessel, second three-dimensional memories for storing second voxel data (binary) of the epidermis, the bone, and the blood vessel obtained by the level detector, a distance detector for detecting distances between a predetermined projection plane in a three-dimensional space and the second voxel data, a minimum detector for detecting a distance between the projection plane and one of the second voxel data of the epidermis, bone, and blood vessel, which is closest to the projection plane, and a surface image generating circuit for shading minimum values of pixels in the projection plane to generate a surface image.

Abstract: A local cerebral blood flow measuring apparatus includes an expiratory tube arranged along a slice within a photography area of a gantry, and a sensor for detecting end of expiration. The expiratory tube includes a chamber for storing only an end tidal air, in synchronism with the end of expiration detected by the sensor. The end tidal air storage chamber and a subject to be examined are scanned with X-rays from the gantry, in synchronism with the end tidal air. The tracer concentration of the end tidal air storage chamber is measured by means of data derived from the gantry.

Abstract: In a CT imaging apparatus, tracer gas such as Xenon is drawn via a pipe into a patient in synchronism with X-ray tomographic data acquisition. The tracer gas inhalation is controlled by a data acquisition controller through a valve driver. The tracer gas concentrations in the local cerebral tissue and air expired from the patient are measured in the image analysis device. The first-mentioned tracer gas concentration is measured before its saturation in the patient. The partition coefficients of the local cerebral portions are calculated in the calculation device from the ratio of the first area to the second area. The first area is defined by the first curve representing the tracer gas concentration of the local cerebral tissue, while the second area is defined by the second curve representing the tracer gas concentration of the air expired by the patient.