Image diagnosis apparatus and image diagnosis method

Abstract

A detector detects gamma-rays emitted from inside an imaging region. An acquisition unit acquires a plurality of first projection data sets associated with a plurality of projection angles via the detector. An attenuation-correction unit attenuation-correct the plurality of first projection data sets based on a first CT image associated with the imaging region to generate a plurality of second projection data sets associated with the plurality of projection angles. An index calculation unit calculates an index based on the plurality of second projection data sets. The index is corresponding to a degree of positional offset between the imaging region at the time of acquisition of a plurality of third projection data sets associated with the first CT image and the imaging region at the time of acquisition of the plurality of first projection data sets.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from a prior Japanese application No. 2008-328027 filed on December 24, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an image diagnosis device and an image diagnosis method for performing image diagnosis by combining PET (Positron Emission Tomography) and X-ray CT (Computed Tomography). Background technique [0004] There is an imaging diagnostic apparatus that performs image diagnosis by combining PET and X-ray CT (hereinafter referred to as a PET-CT apparatus). A PET-CT device is a device obtained by integrating a PET device and an X-ray CT device using the same bed. The cross section of the PET image and the cross section of the CT image are set so as to be physically consistent. [0005] However, since the PET image and the CT image cannot be taken at the same time, there may be a...

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Problems solved by technology

In addition, even if a breathing protocol with a small position shift is used, the effect may not be sufficient in some cases.

Or, sometimes the breathing method requested by the subject cannot be carried out

Furthermore, the calibration method of physically measuring the positional displacement may not be able to perform accurate positional alignment due to insufficient PET positional resolution (approximately 5mm)

[0009] In this way, although various methods have been proposed to solve the positional offset between PET images and CT images, sometimes they cannot effectively function

Moreover, there is no method or index to quantitatively measure the positional offset between PET images and CT images in the human body

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