X-ray computed tomography apparatus

1. An X-ray computed tomography apparatus comprising:

a plan storage unit configured to store a plan for sequentially executing a plurality of scans to acquire a plurality of projection data sets;

a scan information storage unit configured to store scan information including the plurality of projection data sets; and

a scan control unit configured to determine, based on the scan information until an interruption of the scan being executed, a scan interruption position corresponding to a time at which the scan being executed is interrupted and to resume the interrupted scan in the plan from the scan interruption position, wherein at least one of the plurality of scans comprises a first scan and a second scan after the first scan, the first scan and the second scan acquiring the plurality of projection data sets during a stationary state of a top to allow generation of image data, and

the scan control unit is configured to:

calculate a halt position in the first scan and the second scan based on the plurality of projection data sets for the first scan and the second scan that are stored in the scan information storage unit;

if the halt position is in the first scan, determine the position as of start of the first scan as a resumption position and resume the first scan from the resumption position; and

if the halt position is after the first scan and before the second scan or in the second scan, resume the second scan from a start position of the second scan.

2. The apparatus of claim 1 , wherein the scans are different one another.

3. The apparatus of claim 2 , the apparatus further comprising;

a rotating frame configured to rotatably support an X-ray tube configured to generate X-rays and an X-ray detector configured to detect X-rays transmitted through an object on a top; wherein

the scan control unit is configured to determine the scan interruption position as a position of the rotating frame and a position of the top based on the plan and the scan information when the plan is interrupted.

4. An X-ray computed tomography apparatus comprising:

a plan storage unit configured to store a plan for sequentially executing a plurality of scans to acquire a plurality of projection data sets;

a scan information storage unit configured to store scan information including the plurality of projection data sets; and

a scan control unit configured to determine, based on the scan information until an interruption of the scan being executed, a scan interruption position corresponding to a time at which the scan being executed is interrupted and to resume the interrupted scan in the plan from the scan interruption position, wherein the plurality of scans comprises at least one helical scan to acquire one or more of the projection data sets through X-ray irradiation during movement of a top, and wherein the scan control unit is configured to resume the helical scan when the helical scan is interrupted, such that:

if a number of the projection data sets for the helical scan that are stored in the scan information storage unit is equal to or greater than a predetermined margin number, the scan control unit resumes the helical scan from the scan interruption position as of past acquisition of the projection data set for the helical scan that is prior to the latest projection data set by the margin number; and

if the number of the projection data sets for the helical scan that are stored in the scan information storage unit is less than the margin number, the scan control unit determines the scan interruption position as of start of the helical scan as a resumption position, and resumes the helical scan from the resumption position.

5. An X-ray computed tomography apparatus comprising:

a plan storage unit configured to store a plan for sequentially executing a plurality of scans to acquire a plurality of projection data sets;

a scan information storage unit configured to store scan information including the plurality of projection data sets;

a scan control unit configured to determine, based on the scan information until an interruption of the scan being executed, a scan interruption position corresponding to a time at which the scan being executed is interrupted and to resume the interrupted scan in the plan from the scan interruption position; and

an operation unit configured for input of a start time of a specific scan of the plurality of scans, a resumption time of the specific scan after start of the specific scan, and an X-ray irradiation duration in the specific scan, wherein the scan control unit is configured to:

if the input resumption time of the specific scan is between the input start time of the specific scan and a scheduled end time at which the X-ray irradiation duration since the input start time of the specific scan completes, resume the specific scan from a position as of start of the specific scan; and

if the input resumption time is on or after the scheduled end time, stop the specific scan.

6. An X-ray computed tomography apparatus comprising:

a plan storage unit configured to store a plan for sequentially executing a plurality of scans to acquire a plurality of projection data sets;

a scan information storage unit configured to store scan information including the plurality of projection data sets; and

a scan control unit configured to determine, based on the scan information until an interruption of the scan being executed, a scan interruption position corresponding to a time at which the scan being executed is interrupted and to resume the interrupted scan in the plan from the scan interruption position, wherein the plurality of scans comprises a specific scan and a post scan after the specific scan, wherein the apparatus further comprises an operation unit configured for input of a start time of the specific scan, a start time of the post scan after start of the specific scan, and a duration between the start time of the specific scan and a scheduled start time of the post scan, and wherein the scan control unit is configured to:

if the input start time of the post scan is between the input start time of the specific scan and the scheduled start time, start the post scan at the scheduled start time; and

if the input resumption time of the post scan is on or after the scheduled start time, stop the start of the post scan.