Hitachi, Ltd.

Toshie Sasaki

Yoshihiko Nagamine

Kazuo Hiramoto

Naoki Miyamoto

Kikuo Umegaki

Toru Umekawa

Taeko Matsuura

Shinichi Shimizu

Seishin Takao

Takao Kidani

Rika Baba

A radiotherapy system acquires an image which is necessary for positioning of a patient for radiation treatment and enables grasping of a positional relationship of a target in a treatment radiation irradiated state, a radiation passing area and a critical organ. An X-ray imaging device is attached to the rotatable support device and configured to apply X-rays to the subject from plural directions while rotating around the subject to perform X-ray imaging. A target recognizing device recognizes a three-dimensional position of the target in the subject from X-ray images acquired by the X-ray imaging device; and CT image generating devices are configured to select, from the X-ray images acquired by the X-ray imaging device, the images in which the position of the target recognized by the recognizing device satisfies the treatment radiation irradiation condition for the motion tracking treatment to perform image reconstruction and generate a cone beam CT image.

Radiotherapy system

An object of the present invention is to easily maintain the couch positioning accuracy and reduce the couch positioning time while resolving the complexity of input operations by the operator at the time of couch positioning. To accomplish the above object, calculation points are set to a CT image at the time of treatment planning, and the 3D coordinates of the set calculation point are set to a DRR image. When a couch positioning unitloads the DRR image from an image server, it reads the coordinates of calculation points set to the DRR image and displays them on the monitortogether with the DRR image. Further, when DR image data is loaded into the couch positioning unit, the DR image is displayed on the monitorand calculation points set to the DRR image are set also to the DR image.

Couch positioning system for radiotherapy, treatment plan unit, and couch positioning unit

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Tokyo, Japan

Toshie Sasaki