Evaluation of butterworth post-filtering effects on contrast and signal noise to ratio values for SPECT images reconstruction

Saib, Dyg Masury Ahmad; Azman, Nurul Zahirah Noor; Said, Mohd Aminudin; Aseri, Muhd Izzat Muhd; Al-Marri, Hana Mohammed

doi:10.1016/j.radphyschem.2021.109932

Cited by 1 publication

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“…Both Butterworth and Gaussian filters can be used to compensate for the loss of detail in the image while reducing noise in the image, and therefore are commonly used in image reconstruction. Change of fc and n of the Butterworth filter affects the noise and resolution of the image [21,22].…”

Section: Discussionmentioning

confidence: 99%

Impacts of different reconstruction methods on the image quality of cadmium–zinc–telluride-based single photon emission computed tomography/computed tomography pulmonary perfusion imaging

Wu,

Zhang,

Zhou

et al. 2023

Nuclear Medicine Communications

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Objective The objective was to evaluate the impacts of different reconstruction methods [filtered back projection (FBP) and ordered subset expectation maximization (OSEM)] and different filters (Butterworth filter and Gaussian filter) on the image quality in cadmium–zinc–telluride (CZT)-based single photon emission computed tomography (SPECT)/computed tomography (CT) pulmonary perfusion imaging. Methods A combinations including FBP with Butterworth filter, OSEM with Butterworth filter (OSEM + Butterworth filter ), and OSEM with Gaussian filter (OSEM + Gaussian filter) were used during SPECT image reconstruction. Visual and quantitative parameters [root mean square (RMS) noise, contrast and contrast-to-noise ratio (CNR)] were used to evaluate image quality. Results The OSEM + Gaussian filter had better RMS noise and CNR than those of the FBP + Butterworth filter or OSEM + Butterworth filter, while the OSEM + Butterworth filter had the best contrast. The highest visual scores were obtained by OSEM + Gaussian filter (P < 0.0001). In the lesion size <2 cm group, the contrast (P < 0.01) and visual scores (P < 0.001) of OSEM + Butterworth filter were better than those of the other two groups. In the lesion size ≥2 cm group, the RMS noise and visual scores of OSEM + Gaussian filter were better than those of the other two groups. Conclusion In CZT SPECT/CT pulmonary perfusion imaging, this study recommended the clinical use of the OSEM + Gaussian filter combination for reconstruction in both conventional and larger lesions, the OSEM + Butterworth filter image postprocessing method might be advantageous in small lesions.

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Section: Discussionmentioning

confidence: 99%