Image processing apparatus
View Patent ↗An image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to acquire pieces of change information indicating temporal changes in computed tomography (CT) values of a myocardium and a right ventricular of a subject based on a plurality of chronologically consecutive images that are generated by an X-ray CT apparatus by scanning the subject to which a contrast agent is administered. The processing circuitry is configured to correct the piece of change information on the myocardium based on the piece of change information on the right ventricular.
1. An image processing apparatus comprising:
processing circuitry configured to
acquire pieces of change information indicating temporal changes in computed tomography (CT) values of a myocardium and a right ventricular of a subject based on a plurality of chronologically consecutive images that are generated by an X-ray CT apparatus by scanning the subject to which a contrast agent is administered; and
correct the piece of change information on the myocardium based on the piece of change information on the right ventricular.
2. The image processing apparatus according to claim 1 , wherein the processing circuitry is configured to correct the piece of change information on the myocardium based on a time at which the CT value of the piece of change information on the right ventricular indicates a peak.
3. The image processing apparatus according to claim 2 , wherein the processing circuitry is configured to correct, by linear interpolation, the piece of change information on the myocardium in a predetermined period including the time indicating the peak of the piece of change information on the right ventricular.
4. The image processing apparatus according to claim 3 , wherein
the processing circuitry is configured to
acquire a piece of change information on a blood vessel that supplies blood to the myocardium, and
correct, by linear interpolation, the piece of change information on the myocardium in the predetermined period based on a time at which a CT value of the piece of change information on the blood vessel indicates a peak.
5. The image processing apparatus according to claim 2 , wherein the processing circuitry is configured to perform a scaling process on the piece of change information on the right ventricular in a certain period including the time indicating the peak, and perform a subtraction process of subtracting the piece of change information obtained through the scaling process from the piece of change information on the myocardium to thereby correct the piece of change information on the myocardium.
6. The image processing apparatus according to claim 5 , wherein the processing circuitry is configured to perform the scaling process such that a single extreme value is obtained when the piece of change information on the myocardium obtained through the subtraction process is differentiated.
7. The image processing apparatus according to claim 6 , wherein the processing circuitry is configured to perform the scaling process such that a single extreme value is obtained when the piece of change information on the myocardium obtained through multiple times of the subtraction process is differentiated.
8. The image processing apparatus according to claim 1 , wherein
the processing circuitry is further configured to determine whether a correction process on the piece of change information on the myocardium is to be performed based on a time at which the CT value of the piece of change information on the right ventricular indicates a peak,
the processing circuitry is configured to correct, when the correction process on the piece of change information on the myocardium is to be performed, the piece of change information on the myocardium.
9. The image processing apparatus according to claim 8 , wherein when a time at which the CT value of the piece of change information on the right ventricular indicates a peak and a time at which the CT value of the piece of change information on the myocardium indicates a maximum value fall within a predetermined time range, the processing circuitry is configured to determine that the correction process on the piece of change information on the myocardium is to be performed.
10. The image processing apparatus according to claim 8 , wherein when the CT value of the piece of change information on the myocardium indicates a maximum value between the time at which the CT value of the piece of change information on the right ventricular indicates a peak and the time at which the CT value of the piece of change information on the blood vessel that supplies blood to the myocardium indicates a peak, the processing circuitry is configured to determine that the correction process on the change information on the myocardium is to be performed.