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KMID : 1143620220260020015
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Korean Journal of Nuclear Medicine Technology
2022 Volume.26 No. 2 p.15 ~ p.19
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A Comparative Study of Production of [68Ga]PSMA-11 with or without Cassette Type Modules
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Park Hyun-Sik
Jo Byeong-Min
An Hyun-Ho
Lee Hong-Jin
Lee Jin-Hyeong
Lee Gyeong-Jae
Lee Byung-Chul
Lee Won-Woo
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Abstract
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Purpose: [68Ga]PSMA-11 is needed the high reproducibility, excellent radiochemical yield and purity. In term of radiation safety, the radiation exposure of operator for its production also should be considered. In this work, we performed a comparative study for the fully automated synthesis of [68Ga]PSMA-11 between non-cassette type and cassette type.
Materials and Methods: Two different type of modules (TRACERlab FX N pro for non-cassette type and BIKBox for cassette type) were used for the automated production of [68Ga]PSMA-11. According to the previously identified elution profile, Only 2.5 ml with high radioactivity was used for the reaction. After adjusting the pH of the reaction solution with
HEPES buffer solution, the precursor was added and reacted with at 95 ℃ for 15 minutes. The reaction mixture was separated and purified using a C18 light cartridge. The product was eluted with 50% EtOH/saline solution and diluted with saline. It was completed by sterilizing filter. In the non-cassette type, the aforementioned process must be prepared directly. However, in the cassette method, synthesis was possible simply by installing a kit that was already completed.
Results: Both total [68Ga]PSMA-11 production time were 25±3(non-cassette type) and 23±3 minutes(cassette type). The
radiochemical yield of the non-cassette type(65.5±5.7%) was higher than that of the cassette type(61.6±4.8%) after sterilization filter. The non-cassette type took about 120 minutes of preparation time before synthesis due to washing of synthesizer and reagent preparation. However, since the cassette type does not require washing and reagent preparation, it took about 20 minutes to prepare before synthesis. Both type of synthesizer had a radiochemical high purity(>99%).
Conclusion: The non-cassette type production of [68Ga]PSMA-11 showed higher radiochemical yield and lower cost than
the cassette type. However, The cassette type has an advantage in terms of preparation time, convenience, and quipment maintenance.
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KEYWORD
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[68Ga]PSMA-11, Automated synthesis, 68Ge/68Ga generator
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