National Institutes for Quantum and Radiological Science and Technology

Hamamatsu-photonics K.k.

National Institute of Radiological Sciences

National Institutes for Quantum Science and Technology

National Institutes for Quantum Science

Technology Atox Co., Ltd.

Hideaki Tashima

Taiga Yamaya

Mitsuo Watanabe

Eiichi Tanaka

Go Akamatsu

An image is reconstituted by iterative approximation, a PET event updated image is produced by updating a current image using a PET event, a Compton event updated image is produced by updating the current image using a Compton event, the PET event updated image and the Compton event updated image that have been independently produced are weighted and added together, and the current image is updated using an image obtained by addition processing. In this way, PET events and Compton events, which have different properties, can be used in combination to efficiently and stably reconstitute images, improving image quality.

Medical image processing device, computer program, and nuclear medicine device

By a technique different from conventional techniques, quality of an image obtained by nuclear medicine imaging is improved. In an image processing device, a first reconstruction process section generates, by a reconstruction process with respect to list mode data acquired by a PET device, an initial image indicating a concentration distribution of a radioactive substance. A scatter component derivation section derives, from the initial image, scatter component projection data indicating a scatter component of radiation rays by scatter estimation simulation. A second reconstruction process section generates, by a reconstruction process with respect to the scatter component projection data, a low resolution scatter image indicating the scatter component and having a resolution lower than that of the initial image. An upscaling process section generates an upscaled scatter image having a resolution identical with that of the initial image by upscaling the low resolution scatter image.

Image processing device, image processing system, and image processing method

A partial-ring PET device, in which some of coincidence radiation detectors to be arranged in a ring shape around a field of view for detecting lines of response of annihilation radiations are missing, is compensated for a drop in image quality due to the missing of the coincidence radiation detectors by including single gamma-ray radiation detectors for detecting at least either one of the annihilation radiations as a single gamma-ray. This can reduce missing of projection angles and reduce artifacts in PET images.

Partial-ring PET device and PET device

An inclined PET device is provided in which the cut plane of a detector ring upon which a plurality of PET detectors are disposed is inclined so that it does not intersect perpendicularly with the long axis of a bed that carries a subject to be examined and in which an open space that passes through the bed in a direction perpendicular to the long axis thereof is formed, in order to enable access to the subject to be examined. The PET detectors are disposed and stacked in a direction parallel to the long axis of the bed. Thereby, the number of PET detectors is reduced and device cost is reduced, while the detector ring as well as the device can be miniaturized. At the same time, the open space that passes through the bed in a direction perpendicular to the long axis can be preserved.

Inclined pet device and pet combined device

A helmet-type PET device includes a helmet portion (hemispherical detector) and an added portion (jaw portion detector, an ear portion detector, or a neck portion detector). The helmet portion includes a PET detector so as to cover a parietal region of an examination target. The added portion is positioned to dispose a PET detector at a part other than the parietal region of the examination target. PET measurement is performed using both an output from the PET detector at the helmet portion and an output from the PET detector at the added portion.

Growing community of inventors

Chiba, Japan

Hideaki Tashima