PT  - JOURNAL ARTICLE
AU  - Yung Hsiang Kao
AU  - Alicia Corlett
AU  - Katrina Jorna
AU  - Alexander Rhodes
AU  - Dinesh Sivaratnam
TI  - <sup>90</sup>Y PET for Qualitative and Quantitative Assessment of Residual Activity in Delivery Apparatus After Radioembolization
AID  - 10.2967/jnmt.120.258251
DP  - 2021 Jun 01
TA  - Journal of Nuclear Medicine Technology
PG  - 178--179
VI  - 49
IP  - 2
4099  - http://tech.snmjournals.org/content/49/2/178.short
4100  - http://tech.snmjournals.org/content/49/2/178.full
SO  - J. Nucl. Med. Technol.2021 Jun 01; 49
AB  - Assessment of residual activity is critical for quality assurance after 90Y radioembolization. The resin microsphere manufacturer’s indirect method of estimating the residual activity is laborious and vulnerable to inaccuracies. Furthermore, the method cannot localize the exact site of residual activity. 90Y PET/CT for qualitative and quantitative assessment of residual activity has not, to our knowledge, been described. We show an example of 90Y PET/CT of residual activity in the delivery apparatus and catheters packed inside the delivery box. Focally intense residual activity was clearly localized to the stopcock junction. Residual activity was directly quantified by setting the PET volume-of-interest isocontour threshold to 1%.