X-ray computed tomographic apparatus

An X-ray computed tomographic apparatus, comprising:

• a gantry configured to acquire projection data of an arbitrary range in a body axial direction of a subject by continuously moving a tabletop on which said subject is laid down and by continuously rotating an X-ray tube about said subject;
• a reconstructing portion configured to reconstruct image data from said acquired projection data;
• and
• a tube current value determining portion configured to determine plural tube current values respectively corresponding to plural positions within said range, on the basis of a distance, specified or selected by an operator, that said tabletop moves while said X-ray tube rotates once or an index thereof, and an image quality level specified or selected by said operator.

An X-ray computed tomographic apparatus, comprising:

• a gantry configured to acquire projection data of an arbitrary range in a body axial direction of a subject by continuously moving a tabletop on which said subject is laid down and by continuously rotating an X-ray tube about said subject;
• a reconstructing portion configured to reconstruct image data from said acquired projection data;
• a tube current value determining portion configured to determine plural tube current values respectively corresponding to plural positions within said range, on the basis of an image quality level specified or selected by an operator;
• and
• a display portion configured to display a graph showing a spatial change of tube current values corresponding to said plural tube current values.

An X-ray computed tomographic apparatus, comprising:

• a gantry configured to acquire projection data related to a subject;
• a reconstructing portion configured to reconstruct image data from said acquired projection data;
• a sample image storage portion configured to store data of plural sample images corresponding to plural image quality levels;
• and
• a display portion configured to display a sample image corresponding to an image quality level selected by an operator.

An X-ray computed tomographic apparatus, comprising:

• a gantry configured to acquire projection data related to a subject;
• a reconstructing portion configured to reconstruct image data from said acquired projection data according to reconstruction processing selected by an operator from plural types of reconstruction processing;
• and
• a tube current value determining portion configured to determine a tube current value on the basis of said selected type of reconstruction processing and an image quality level specified or selected by said operator.

An X-ray computed tomographic apparatus, comprising:

• a gantry configured to acquire projection data of an arbitrary range in a body axial direction of a subject by continuously moving a tabletop on which said subject is laid down and by continuously rotating an X-ray tube about said subject;
• a reconstructing portion configured to reconstruct image data from said acquired projection data;
• a tube current value determining portion configured to determine plural tube current values respectively corresponding to plural positions within said range, on the basis an image quality level specified or selected by an operator;
• and
• a control portion that dynamically controls a tube current of said X-ray tube in association with movement of said tabletop, according to said determined plural tube current values.