Title:
X-RAY CT DEVICE AND PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/137011
Kind Code:
A1
Abstract:
This X-ray CT device uses iterative reconstruction to obtain a CT image with the desired noise reduction or X-ray reduction ratio. An iterative approximation reconstruction unit (136) is provided which, from measured projection data obtained by an X-ray detection unit of the X-ray CT device, iteratively reconstructs a CT image in a reconstruction range of a subject, and iteratively corrects the CT image such that calculated projection data, calculated through forward projection of a CT image, is the same as the difference between measured projection data detected by the X-raw detection unit and calculated projection data. The iterative approximation reconstruction unit is provided with a parameter determination unit (151), an iterative correction unit (152), and a table unit (153) which calculates in advance the relation between each parameter used in the iterative reconstruction, and noise reduction or X-ray reduction ratio in the CT image. The parameter determination unit (151) determines the parameters from a calculation table in the table unit (153) depending on the desired reduction ratio.
Inventors:
YAMAKAWA KEISUKE (JP)
KOJIMA SHINICHI (JP)
KOJIMA SHINICHI (JP)
Application Number:
PCT/JP2015/053044
Publication Date:
September 17, 2015
Filing Date:
February 04, 2015
Export Citation:
Assignee:
HITACHI MEDICAL CORP (JP)
International Classes:
A61B6/03
Domestic Patent References:
| WO2012147471A1 | 2012-11-01 | |||
| WO2013008702A1 | 2013-01-17 |
Foreign References:
| US20130129178A1 | 2013-05-23 |
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
Polaire Intellectual Property Corporation (JP)
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