X-ray CT apparatus and image correction method

摘要

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.

主权项

1. 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:
An imaging processor configured to implement: 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 contrast 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.