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Improvement of spatial resolution of PIXE-CT using ML-EM algorithm in TIARA

Sato, Takahiro; Koka, Masashi; Kada, Wataru; Yokoyama, Akihito; Okubo, Takeru; Yamazaki, Akiyoshi; Ishii, Yasuyuki; Kamiya, Tomihiro

In order to get better spatial resolution of PIXE-CT, ML-EM (maximum likelihood expectation maximization) iterative algorithm) was used instead of FBP. The ML-EM algorithm had been developed for emission computed tomography such as SPECT (single photon emission computed tomography). It is relatively easy to apply the ML-EM to micro-PIXE because both SPECT and micro-PIXE originated from photon emission phenomena. Moreover, unlike FBP, the ML-EM algorithm has highly resistance against the errors of projection images and is suitable for rare event analyses such as micro-PIXE. As a result, the estimated FWHM is 4.4 $$pm$$ 0.6 $$mu$$m, which is the best performance of PIXE-CT in our study.

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