SPECT ATTENUATION RELATED ARTIFACTS AND THEIR REMOVAL BY ATTENUATION CORRECTION IN UNIFORM AND NON-UNIFORM ATTENUATING OBJECTS USING ITERATIVE RECONSTRUCTION ALGORITHMS

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KALANTARI FARAZ; RAJABI HOSSEIN; SAGHARI MOHSEN; EMAMI ALIREZA

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Journal Paper

Paper Information

Journal: Iranian Journal of Nuclear Medicine Year:2010 | Volume:18 | Issue:SUPPLEMENT 1 Page(s): 96-96

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Title

SPECT ATTENUATION RELATED ARTIFACTS AND THEIR REMOVAL BY ATTENUATION CORRECTION IN UNIFORM AND NON-UNIFORM ATTENUATING OBJECTS USING ITERATIVE RECONSTRUCTION ALGORITHMS

Author(s)

KALANTARI FARAZ | RAJABI HOSSEIN | SAGHARI MOHSEN | EMAMI ALIREZA

Keywords

SPECT

ATTENUATION ARTIFACT CORRECTION

ITERATIVE RECONSTRUCTION

Abstract

Introduction: Photon attenuation is one of the main causes of quantitative errors and artifacts in SPECT. CT based attenuation map is necessary to correct for this effect accurately. A number of attenuation related artifacts are described. A fast and memory efficient algorithm is proposed for attenuation correction.Methods: In our CT based attenuation correction algorithm, attenuated projections of an arbitrary estimation are calculated. These projections are compared with real projections. The error due to comparison updates the first arbitrary image. This iterative procedure continues till there is no difference between mathematical and real projections. To consider the effect of Poisson noise during reconstruction, EM statistical reconstruction is used. The effect of attenuation is enrolled in both projection and backprojection steps. To accelerate the reconstruction algorithm, a rotating image in a fix grid with bilinear interpolation is used to simplify ray tracing for creating mathematical projections. OSEM with much faster convergence rate is also used instead of MLEM as iterative algorithm. Different phantom configurations with uniform and non-uniform attenuation map are used to evaluate the accuracy of this algorithm. Projections free from the effect of attenuation were also simulated. Reconstructed image from these attenuation free projections is considered as reference image. Normalized mean square error between reference and corrected image and image contrast were used for quantitative evaluation of this algorithm.Results: contrast of central hot spot reduced to about half of its real contrast due to attenuation. Non-uniformities, like hot skin, bright long related spots and colds bone related spots were also created in non-corrected images due to attenuation. All attenuation related artifacts removed after attenuation correction. NMSE is reduced from 1 in non-corrected images to 0.1 in corrected images. Much better fit in line profile of corrected images and reference images were also observed.Conclusion: By using more suitable models for image formation it is possible to reconstruct images with much higher quantitative and qualitative accuracy which is essential in both diagnostic and image guided therapy procedures.

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APA: Copy

KALANTARI, FARAZ, RAJABI, HOSSEIN, SAGHARI, MOHSEN, & EMAMI, ALIREZA. (2010). SPECT ATTENUATION RELATED ARTIFACTS AND THEIR REMOVAL BY ATTENUATION CORRECTION IN UNIFORM AND NON-UNIFORM ATTENUATING OBJECTS USING ITERATIVE RECONSTRUCTION ALGORITHMS. IRANIAN JOURNAL OF NUCLEAR MEDICINE, 18(SUPPLEMENT 1), 96-96. SID. https://sid.ir/paper/571548/en

Vancouver: Copy

KALANTARI FARAZ, RAJABI HOSSEIN, SAGHARI MOHSEN, EMAMI ALIREZA. SPECT ATTENUATION RELATED ARTIFACTS AND THEIR REMOVAL BY ATTENUATION CORRECTION IN UNIFORM AND NON-UNIFORM ATTENUATING OBJECTS USING ITERATIVE RECONSTRUCTION ALGORITHMS. IRANIAN JOURNAL OF NUCLEAR MEDICINE[Internet]. 2010;18(SUPPLEMENT 1):96-96. Available from: https://sid.ir/paper/571548/en

IEEE: Copy

FARAZ KALANTARI, HOSSEIN RAJABI, MOHSEN SAGHARI, and ALIREZA EMAMI, “SPECT ATTENUATION RELATED ARTIFACTS AND THEIR REMOVAL BY ATTENUATION CORRECTION IN UNIFORM AND NON-UNIFORM ATTENUATING OBJECTS USING ITERATIVE RECONSTRUCTION ALGORITHMS,” IRANIAN JOURNAL OF NUCLEAR MEDICINE, vol. 18, no. SUPPLEMENT 1, pp. 96–96, 2010, [Online]. Available: https://sid.ir/paper/571548/en

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