Tokyo Shibaura Electric Co., Ltd.

Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Tamon Inouye

Hiroyuki Mizutani

Toshio Uehara

Kiyoto Saito

Susumu Nishida

Tadatoki Yoshida

A image is constructed from nuclear magnetic resonance image data which represent a characteristic of an object. Data are collected using the saturation-recovery method and the inversion-recovery method; a first and second image are produced from data from each method, respectively; and a third image is produced from the first and second image, depending only on a single relaxation time.

Imaging method and apparatus for obtaining spin-lattice relaxation time

An image reconstruction apparatus of the present invention comprises units for measuring projection data from a number of angular directions within an angular range less than 180.degree. with respect to a subject, a unit for performing parallel displacement of the projection data so that the subject may substantially be located within a specific region corresponding to said angular range, a unit for calculating a Fourier coefficient for expanding the displaced that into a Fourier series, and units for reconstructing a slice image of the subject by means of the calculated Fourier coefficient.

Image reconstruction apparatus and process

A computerized tomography system and method using penetrating radiation having a radiation source for radiating penetrating radiation into the interior of a thin sliced layer portion of a subject, in a manner that it expands substantially in a fanned fashion, a detector for substantially dividing the radiation after passing through said sliced layer portion into a plurality of radiation beams diverging at a defined angle, thereby detecting the intensity of said beams, a moving unit for substantially linearly scanning each of said beams at least once in a direction transverse of said sliced layer portion, a data processing unit for reconstructing an image of said sliced layer portion on the basis of detected data delivered from said detector, and a display unit for displaying said image on the basis of the results of said reconstruction.

Computed tomography apparatus and method using penetrating radiation

In a method and an apparatus for performing computed tomography using radiation, the apparatus includes a data selecting unit which divides into a plurality of groups and stores the projection data signals provided by a multitude of radiation beams being projected along several different directions through a slice to be imaged in a subject and penetrating the slice from the external circumference of it with each of the groups corresponding to the beams penetrating along selected directions within a specific scan sector less than 180.degree.; a Fourier transform unit for calculating sample values for the one-dimensional Fourier transform of a projection function formed by each group of said projection data signals; a function calculating unit for calculating sample values for the one-dimensional Fourier transforms as mentioned above for a plurality of projecting directions selected outside said specific scan sector; and a reconstruction unit for calculating the absorption coefficient distribution of the radiation beams in said slice from both said sets of sample values, and a display unit.

Method and apparatus for performing computed tomography

An apparatus and method for tomographic analysis comprising a detecting system for detecting a number of radiation beams having penetrated a sectional area of a subject and producing projection data signals; a CPU and a memory for applying a filter function to the projection data signals by a convolution integration or by a computational technique included in a filtered-back projection, thereby calculating modified projection data signals, and conducting back projection operations only with respect to points in a partial region or subsection of the sectional portion area by means of the modified projection data, thereby calculating the radiation beam absorption coefficients at said points, the integral operation used in the calculation of the modified projection data signals being limited to an interval in which the quality of an image of said partial region or subsection to be displayed can exclusively be improved by the filter function; and a display unit for displaying the image of the partial region on the basis of said absorption coefficients.

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Kawasaki, Japan

Tamon Inouye