Title:
ABSORPTION COEFFICIENT IMAGE ESTIMATION METHOD, ABSORPTION COEFFICIENT IMAGE ESTIMATION PROGRAM, AND POSITRON CT DEVICE EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2018/220686
Kind Code:
A1
Abstract:
In this absorption coefficient image estimation method, an absorption coefficient value is corrected in step S8 (μ = μ'+α×μoff) on the basis of a mathematical relationship in which the difference between a value of a non-quantitative image μ' in a region Ω and a known absorption coefficient value (a value of a true absorption coefficient image) can be approximated by α×μoff obtained by multiplying an offset image μoff by a factor α. Therefore, in the absorption coefficient image having the absorption coefficient value μ corrected by the step S8 (μ = μ'+α×μoff), a systematic error becomes small. As a result, a quantitative absorption coefficient image can be created, and accurate absorption correction of a radioactive image becomes possible.
Inventors:
KOBAYASHI TETSUYA (JP)
Application Number:
PCT/JP2017/019944
Publication Date:
December 06, 2018
Filing Date:
May 29, 2017
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
G01T1/161
Foreign References:
| US20150193927A1 | 2015-07-09 | |||
| JP2015519555A | 2015-07-09 |
Other References:
LI, YUSHENG ET AL.: "Transmission-less attenuation estimation from time-off-flight PET histo-images using consitsensy equations", PHYSICS IN MEDICINE AND BIOLOGY, vol. 60, no. 16, 21 August 2015 (2015-08-21), pages 6563, XP020287693, DOI: 10.1088/0031-9155/60/16/6563
LI, QUANZHENG ET AL.: "Joint estimation of activity image and attenuation sinogram using time-of-flight positron emission tomography data consistency condition filtering", JOURNAL MEDICAL IMAGING, vol. 4, no. 2, 26 April 2017 (2017-04-26), pages 023502, XP055634118, DOI: 10.1117/1.JMI.4.2.023502
See also references of EP 3633411A4
LI, QUANZHENG ET AL.: "Joint estimation of activity image and attenuation sinogram using time-of-flight positron emission tomography data consistency condition filtering", JOURNAL MEDICAL IMAGING, vol. 4, no. 2, 26 April 2017 (2017-04-26), pages 023502, XP055634118, DOI: 10.1117/1.JMI.4.2.023502
See also references of EP 3633411A4
Attorney, Agent or Firm:
SUGITANI Tsutomu (JP)
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