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Comparison of PET/MR image quality with and without point spread function algorithm according to reconstruction type  

Park, Chan Rok (Dept. of Nuclear Medicine, Seoul National Univ. Hospital)
Moon, Il Sang (Dept. of Nuclear Medicine, Seoul National Univ. Hospital)
Noh, Gyeong Woon (Dept. of Nuclear Medicine, Seoul National Univ. Hospital)
Publication Information
The Korean Journal of Nuclear Medicine Technology / v.22, no.1, 2018 , pp. 43-45 More about this Journal
Abstract
Purpose In this study, we evaluated image by applying with and without point spread function algorithm(PSF) according to reconstruction type. Materials and Methods Biograph mMR (Siemens, Germany) was used as PET/MR scanner. For phantom study, we used NEMA IEC Body phantom maintaining radioactivity ratio (hotsphere:background = 8:1). To evaluate phantom image quality, percent contrast recovery and signal to noise ratio (SNR) were used by drawing ROI to 4 spheres. In clinical study, the 20 patients who underwent simultaneous PET/MR was selected and set the ROI at liver. we evaluated images as SNR. Results In the phantom results, The percent contrast recovery applying PSF algoritm was high 5 % compared to without PSF algoritm and SNR was also high 11 %. In the clinical study result, we confirmed that The SNR applying PSF algoritm was high 5 % compared to without PSF algoritm. Conclusion We need to simulate a lot of phantom study and clinical analysis to improve image quality for PET/MRI.
Keywords
PET/MR; NEMA IEC Body Phantom; Point Spread Function; Reconstruction;
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