NDLI: Estimation of 6-Degree-of-Freedom (6-DOF) Rigid-Body Patient Motion from Projection Data by the Principal-Axes Method in Iterative Reconstruction

Content Provider	IEEE Xplore Digital Library
Author	Bing Feng King, M.A.
Copyright Year	2006
Description	Author affiliation: Dept. of Radiol., Univ. of Massachusetts Med. Sch., Worcester, MA (Bing Feng; King, M.A.)
Abstract	We developed a method for estimating and compensating rigid-body translation and rotation from scatter-and-attenuation-compensated projection data in iterative reconstruction when multiple projection angles are acquired at the same time. During reconstruction, both the non-attenuated and attenuated line-integrals are calculated. Their ratios are then multiplied times the scatter-corrected projection data to obtain estimated scatter-and-attenuation-compensated projection data. At the end of each iteration, the sets of compensated projection data for the angles acquired at the same time are then employed to calculate the center-of-mass and the inertia tensor. These are used to estimate the location and orientation of the patient by the principle-axes method. The estimated motion is applied in the next iteration to reposition the estimated slices and attenuation map in the projector and back-projector to match the pose of the patient at time the projections were acquired. To evaluate our method, we simulated an acquisition of the MCAT phantom with a 3-head SPECT system and imaged the Data Spectrum anthropomorphic phantom on a 3-head IRIX SPECT system. In simulations the phantom translated and rotated by the same amount 9 times. A numerical projector modeling the motion, attenuation, and distance-dependent blurring was used to generate the projection data. Poisson noise was added and 30 noise-realizations were generated. In the experiment with the anthropomorphic phantom, 4 360-degree acquisitions were performed with the phantom translated or rotated beforehand. A motion-present dataset was made by mixing the 4 acquisitions.
Starting Page	2695
Ending Page	2698
File Size	367332
Page Count	4
File Format	PDF
ISBN	1424405602
ISSN	10957863
DOI	10.1109/NSSMIC.2006.356436
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Motion estimation Iterative methods Imaging phantoms Image reconstruction Scattering Attenuation Anthropomorphism Noise generators Tensile stress Numerical models
Content Type	Text
Resource Type	Article

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Estimation of 6-Degree-of-Freedom (6-DOF) Rigid-Body Patient Motion From Projection Data by the Principal-Axes Method in Iterative Reconstruction

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Estimation of 6-Degree-of-Freedom (6-DOF) Rigid-Body Patient Motion from Projection Data by the Principal-Axes Method in Iterative Reconstruction

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