Performance of the Iterative OSEM and HYPER Algorithm for Total-body PET at SUVmax with a Low 18F-FDG Activity, a Short Acquisition Time and Small Lesions.

Publication date: Mar 25, 2024

The primary objective of this comparative investigation was to examine the qualitative attributes of image reconstructions utilizing two distinct algorithms, namely OSEM and HYPER Iterative, in total-body 18F- FDG PET/CT under various acquisition durations and injection activities. An initial assessment was executed using a NEMA phantom to compare image quality engendered by OSEM and HYPER Iterative algorithms. Parameters such as BV, COV, and CRC were meticulously evaluated. Subsequently, a prospective cohort study was conducted on 50 patients, employing both reconstruction algorithms. The study was compartmentalized into distinct acquisition time and dosage groups. Lesions were further categorized into three size-based groups. Quantifiable metrics including SD of noise, SUV, SNR, and TBR were computed. Additionally, the differences in values, namely ΔSUV, ΔTBR, %ΔSUV, %ΔSD, and %ΔSNR, between OSEM and HYPER Iterative algorithms were also calculated. The HYPER Iterative algorithm showed reduced BV and COV compared to OSEM in the phantom study, with constant acquisition time. In the clinical study, lesion SUV, TBR, and SNR were significantly elevated in images reconstructed using the HYPER Iterative algorithm in comparison to those generated by OSEM (p < 0. 001). Furthermore, an amplified increase in SUV was predominantly discernible in lesions with dimensions less than 10 mm. Metrics such as %ΔSNR and %ΔSD in HYPER Iterative exhibited improvements correlating with reduced acquisition times and dosages, wherein a more pronounced degree of enhancement was observable in both ΔSUV and ΔTBR. The HYPER Iterative algorithm significantly improves SUV and reduces noise level, with particular efficacy in lesions measuring ≤ 10 mm and under conditions of abbreviated acquisition times and lower dosages.

Concepts Keywords
Algorithms Acquisition time
Ct Image quality
Qualitative Injection activity. Article
Suvmax NEMA
Positron-emission tomography


Type Source Name
disease IDO algorithm
drug DRUGBANK Fludeoxyglucose F-18
disease VO time
disease VO injection
disease IDO quality

Original Article

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