TITLE:
Study of Image Contrast Recovery Coefficient (CRC) of a Large Ring PET Scanner
AUTHORS:
M. M. Ahasan, S. Akter, R. Khatun, M.F. Uddin, M. R. Islam, H. M. Jamil, A. N. Monika, M. A. Rahman, R. P. Das, M. M. Rahman, R. A. Sharmin, M. N. Khanam
KEYWORDS:
PET, Filter, Septa & CRC
JOURNAL NAME:
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology,
Vol.8 No.1,
February
22,
2019
ABSTRACT: Image contrast recovery coefficient (CRC) of a large ring PET scanner “macroPET” was studied with septa and without septa configuration by ac-quiring data from a laboratory made 35.7 cm square phantom filled with 18-F. Images were reconstructed with simple 2D filtered back projection using Hann, Hamming and Parsen filters with different cut-off frequencies aiming to investigate the influence of filter and cut-off frequency on image contrast with septa and without septa mode. Results indicate that the CRC, for both hot and cold lesions, is excellent for diameters ≥ 3 cm using cut-off frequencies > 0.4. For a 2 cm hot lesion CRC is around 0.8 to 0.9. CRC for 1 cm hot and cold lesions is ~0.3, as expected. There is surprisingly little difference between results with and without septa. For hot lesions, septa appear to improve CRC slightly, but for cold lesions CRC is slightly poorer using septa.