Evaluation of the performance of a high-resolution time-of-flight PET system dedicated to the head and breast according to NEMA NU 2-2012 standard

EJNMMI Physics

Original Research

Takahiro Yamada¹  Shota Watanabe¹  Daisuke Morimoto-Ishikawa¹  Kohei Hanaoka¹  Hayato Kaida²  Kazunari Ishii²  Suzuka Minagawa³  Yoshiyuki Yamakawa³  Tetsuro Mizuta³  Shiho Takenouchi³  Atsushi Ohtani³ 

[1] Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University Hospital, 377-2 Ohno-Higashi, 589-8511, Osakasayama, Osaka, Japan;Division of Positron Emission Tomography, Institute of Advanced Clinical Medicine, Kindai University Hospital, 377-2 Ohno-Higashi, 589-8511, Osakasayama, Osaka, Japan;Department of Radiology, Kindai University Faculty of Medicine, Osakasayama, Japan;Medical Systems Division, Shimadzu Corporation, Kyoto, Japan;

关键词: High resolution;    Dedicated head PET;    Dedicated breast PET;    NEMA;    Performance evaluation;   

DOI  :  10.1186/s40658-022-00518-3

 received in 2022-05-23, accepted in 2022-12-06,  发布年份 2022

来源: Springer

【 摘 要 】

BackgroundThis study evaluated the physical performance of a positron emission tomography (PET) system dedicated to the head and breast according to the National Electrical Manufacturers Association (NEMA) NU2-2012 standard.MethodsThe spatial resolution, sensitivity, scatter fraction, count rate characteristics, corrections for count losses and randoms, and image quality of the system were determined. All measurements were performed according to the NEMA NU2-2012 acquisition protocols, but image quality was assessed using a brain-sized phantom. Furthermore, scans of the three-dimensional (3D) Hoffmann brain phantom and mini-Derenzo phantom were acquired to allow visual evaluation of the imaging performance for small structures.ResultsThe tangential, radial, and axial full width at half maximum (FWHM) at a 10-mm offset in half the axial field of view were measured as 2.3, 2.5, and 2.9 mm, respectively. The average system sensitivity at the center of the field of view and at a 10-cm radial offset was 7.18 and 8.65 cps/kBq, respectively. The peak noise-equivalent counting rate was 35.2 kcps at 4.8 kBq/ml. The corresponding scatter fraction at the peak noise-equivalent counting rate was 46.8%. The peak true rate and scatter fraction at 8.6 kBq/ml were 127.8 kcps and 54.3%, respectively. The percent contrast value for a 10-mm sphere was approximately 50%. On the 3D Hoffman brain phantom image, the structures of the thin layers composing the phantom were visualized on the sagittal and coronal images. On the mini-Derenzo phantom, each of the 1.6-mm rods was clearly visualized.ConclusionTaken together, these results indicate that the head- and breast-dedicated PET system has high resolution and is well suited for clinical PET imaging.

【 授权许可】

CC BY   
© The Author(s) 2022

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