Kabushiki Kaisha Toshiba

Yusuke Toki

Masahiro Ozaki

Manabu Hiraoka

Naoki Sugihara

Yasuo Nobuta

Makoto Hayashibara

Takeo Nabatame

Masao Yamahana

Hiroyuki Onuki

Ichiro Yamagishi

Masakuni Fujise

Tatsuya Ban

Yoshihiko Aochi

Tetsuro Hada

Yukihiro Ogawa

A computerized tomography apparatus is disclosed which reconstructs a tomography image of data from multi-directional projection data in a period of time less than the time required for a scan operation for data acquisition and displays the tomography image after a lapse of a given period of time from the termination of the scan operation. This avoids the time interval between scan and image display becoming irregular. Accordingly, tomography images can be displayed successively like motion picture to observe the internal movements of a section of a human body under examination in real time.

Computerized tomography apparatus

A computer tomography apparatus of the present invention can select one of an ON state in which X-ray radiation is performed to continuously acquire projection data and an OFF state in which acquisition of projection data is stopped, and even in the OFF state, rotation of an X-ray tube is continued, thus allowing quick switching from the OFF state to the ON state.

Computer tomography apparatus

In an X-ray CT scanner, a first field of view corresponding to a reconstructed area of an image to be displayed is set. An original image data are reconstructed on the basis of a plurality of projection data in a patient in response to the first field of view. Whether or not an imaged region in the patient is larger than the first field of view is judged according to referring the original image data. A second field of view including the imaged region wholly is set in case that the imaged region is larger in area than the first field of view. Beam hardening correction data are produced on the basis of the projection data in the second field of view. The projection data are processed into the image corresponding to the first field of view with an aid of the correction data.

X-ray CT scanner and method of collecting image data in the same

A method and a apparatus for helical scan imaging in an X-ray CT, in which the initial set up operation can be achieved easily and accurately. In this X-ray CT apparatus, relative motion of a bed plate and an X-ray source is automatically controlled according to a desired imaging region specified by the operator such that the bed plate and the X-ray source are relatively moved through a distance covered by a scanning region appropriate for collecting the data required to reconstruct tomographic images for the desired imaging region. The scanning region includes the desired imaging region and supplementary interpolation data regions, located at the ends of the desired imaging region and utilized in carrying out interpolations for deriving data in the desired imaging region, and initial acceleration region accounting an initial acceleration of the bed plate, and a final deceleration region accounting a final deceleration of the bed plate.

Method and apparatus for helical scan imaging in X-ray computed

A method and an apparatus for a helical scan imaging in an X-ray CT, in which the initial set up operation can be achieved easily and accurately. In this X-ray CT apparatus, a relative linear motion of the bed plate and the X-ray source is automatically controlled according to the desired imaging region specified by the operator such that the bed plate and the X-ray source is relatively linearly moved through a distance covered by a scanning region appropriate for collecting the data required in order to reconstruct the tomographic images for the desired imaging region. The scanning region includes the desired imaging region and the supplementary interpolation data regions, located at ends of the desired imaging region and utilized in carrying out interpolations for deriving data in the desired imaging region; an initial acceleration region for accounting an initial acceleration of the bed plate; and a final deceleration region for accounting a final deceleration of the bed plate.

A method and an apparatus for a helical scan imaging in an X-ray CT, in which the initial set up operation can be achieved easily and accurately. In this X-ray CT apparatus, a linear motion of the bed plate is automatically controlled according to the desired imaging region specified by the operator such that the bed plate is linearly moved through a distance covered by a scanning region appropriate for collecting the data required in order to reconstruct the tomographic images for the desired imaging region. The scanning region includes: half main data regions, each covering a half rotation (180.degree.) part of a main data region for each of slice planes located at ends of the desired imaging region; supplementary data regions, each covering a half rotation (180.degree.) adjacent to each of the half main data regions; an initial acceleration region for accounting an initial acceleration of the bed plate; and a final deceleration region for accounting a final deceleration of the bed plate.

A method and an apparatus for specifying slice planes in an X-ray CT, capable of specifying a slice plane corresponding to the desired tomographic image easily and accurately. In the apparatus, scans of the body to be examined are carried out and the projection data stored in the large capacity memory first. Then, a scanogram of the body to be examined is displayed, on which a cursor is controlled in order to specify the desired slice planes corresponding to the desired tomographic images to be reconstructed. Then, the desired tomographic images are reconstructed for the desired slice planes indicated by the cursor by using an appropriate part of the projection data stored in the memory which corresponds to the desired slice planes indicated by the cursor. Either one of the helical scan and the multi-scan can be used for collecting the data to obtain the scanogram and the tomographic images.

Growing community of inventors

Utsunomiya, Japan

Yusuke Toki