To provide a technique which enables reconstruction of a highly precise image effective for utilization for diagnosis, and which can reduce a dosage.
This X-ray CT apparatus is equipped with a reconstruction means for reconstructing a pre-scanned image of a subject to be examined from X-ray transmission data based on pre-scanning, and for reconstructing a main-scanned image of the subject from X-ray transmission data based on main scanning; a judging means for judging the start of the main scanning on the basis of a change in the CT value of the pre-scanned image; and a scanning controlling means for performing the main scanning, while changing a helical pitch toward the terminal end of a direct image reconstruction area from a stopped position of a bed by the pre-scanning, on the basis of the result of judging by the judging means. The scanning controlling means starts the main scanning at the starting end of the image reconstruction range with a first helical pitch enabling the application of X-rays equivalent to a predetermined number of views, and continues the main scanning by changing the first helical pitch to a second predetermined helical pitch, after the application of the X-rays equivalent to the predetermined number of views.
COPYRIGHT: (C)2008,JPO&INPIT
MAEDA TATSURO
OKUMURA YOSHIKAZU
TSUKAGOSHI SHINSUKE
TOSHIBA MEDICAL SYS CORP
| JP2006051234A | 2006-02-23 | |||
| JP2006528892A | 2006-12-28 | |||
| JP2004033778A | 2004-02-05 | |||
| JP2002102218A | 2002-04-09 | |||
| JPH10127621A | 1998-05-19 | |||
| JP2001212131A | 2001-08-07 | |||
| JP2006051234A | 2006-02-23 | |||
| JP2006528892A | 2006-12-28 | |||
| JP2004033778A | 2004-02-05 | |||
| JP2002102218A | 2002-04-09 |
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