US 2014/0212016 A1 · X-RAY CT APPARATUS AND IMAGE CORRECTION METHOD

Abstract

There is provided an X-ray CT apparatus capable of correcting the unevenness of the contrast concentration due to discontinuities in time between slices in contrast imaging using a Prospective Triggering method. In an X-ray CT apparatus 1, projection data in a specific phase of the heart is obtained by performing a scan by emitting X-rays after a predetermined time from the detection of the R wave of electrocardiogram information at each position of the heart in the body axis direction. An image processing device 4 reconstructs a tomographic image on the basis of collected projection data, calculates the projection data collection time in each scan from electrocardiogram information collected from an electrocardiograph 5, calculates the time between scans on the basis of the calculated projection data collection time, and corrects a concentration difference so as to change smoothly for an image of a position in the body axis direction in a range according to the time between scans.

Claims12

Dependent claims

An X-ray CT apparatus that acquires a tomographic image of an object by collecting electrocardiogram information of the object from an electrocardiograph, performing a scan in synchronization with the collected electrocardiogram information, and reconstructing projection data obtained by the scan, the X-ray CT apparatus comprising:

a data collection unit that acquires projection data in a specific phase of a heart intermittently in a plurality of time phases in each position of the heart in a body axis direction by emitting X-rays at a predetermined timing to perform a scan;
a reconstruction unit that reconstructs a tomographic image at each position in the body axis direction on the basis of the projection data acquired by the data collection unit;
a correction unit that calculates a time between scans from a certain scan to a next scan and corrects a concentration difference, which occurs between respective tomographic images, for a tomographic image of a body-axis-direction range determined according to a length of the calculated time between scans;
and
a display unit that displays an image generated on the basis of the tomographic image corrected by the correction unit.

2 more elements

An image correction method in an X-ray CT apparatus that acquires a tomographic image of an object by collecting electrocardiogram information of the object from an electrocardiograph, performing a scan in synchronization with the collected electrocardiogram information, and reconstructing projection data obtained by the scan, the image correction method comprising:

a data collection step of acquiring projection data in a specific phase of a heart intermittently in a plurality of time phases in each position of the heart in a body axis direction by emitting X-rays at a predetermined timing to perform a scan;
a reconstruction step of reconstructing a tomographic image at each position in the body axis direction on the basis of the acquired projection data;
a correction step of calculating a time between scans from a certain scan to a next scan and correcting a concentration difference, which occurs between respective tomographic images, for a tomographic image of body-axis-direction range determined according to a length of the calculated time between scans;
and
a display step of displaying an image generated on the basis of the corrected tomographic image.

2 more elements

Dependencies are inferred from the claim text.

X-ray ct apparatus and image correction method

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X-ray ct apparatus and image correction method

Life of this patent

Abstract

Claims12