What is the most appropriate scan timing for intraoperative detection of malignancy using18F-FDG-sensitive gamma probe? Preliminary phantom and preoperative patient ... View Full Text


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Article Info

DATE

2004-04

AUTHORS

Tatsuya Higashi, Tsuneo Saga, Takayoshi Ishimori, Marcelo Mamede, Koichi Ishizu, Toru Fujita, Takahiro Mukai, Seiji Sato, Hironori Kato, Yoshio Yamaoka, Keiichi Matsumoto, Michio Senda, Junji Konishi

ABSTRACT

PURPOSE: To evaluate the appropriate post-injection timing for hand-held-gamma-ray-detecting probe (GDP) scanning for the intraoperative detection of malignancy after preoperative F-18 FDG (FDG) injection. METHODS: Patient study with superficially located cancer was performed on three patients before operation by dual-phase whole-body PET at 2 and 6-7 hr post-injection of FDG (370 MBq), and by probe scanning from the skin at several points at 1, 3, 5, and 7 hr after FDG injection. TNRa (tumor-adjacent-normal ratio) and TNRc (tumor-contralateral-normal ratio) were calculated. Phantom study was also performed to determine basic GDP function. RESULTS: The patient study revealed that tumors showed constant TNRa (0.9-1.3) and TNRc (1.1-3.0) by GDP count rate, and that there was no tendency of an increase in TNRa with time. The standard deviations of GDP count rate were lower at 1-3 hr post-injection compared with those of delayed scans. While delayed PET showed an increase or no change in the tumor FDG uptake, the decrease of normal tissue FDG uptake was not adequate to create higher TNRs. The phantom study revealed that LN model showed TNRa of 1.7 or greater by GDP count rate (cps) when background contained no FDG, but that they showed TNRa of 1.3 or less when the background contained 4% of the LN FDG activity per ml. CONCLUSION: The present study suggests that higher FDG count rate of tumors at 1-3 hr postinjection would be more suitable for the gamma-probe detection compared with lower count rate at 6-7 hr delayed scans with wide standard deviations. More... »

PAGES

105

References to SciGraph publications

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URI

http://scigraph.springernature.com/pub.10.1007/bf02985100

DOI

http://dx.doi.org/10.1007/bf02985100

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035482139

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15195757


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39 schema:description PURPOSE: To evaluate the appropriate post-injection timing for hand-held-gamma-ray-detecting probe (GDP) scanning for the intraoperative detection of malignancy after preoperative F-18 FDG (FDG) injection. METHODS: Patient study with superficially located cancer was performed on three patients before operation by dual-phase whole-body PET at 2 and 6-7 hr post-injection of FDG (370 MBq), and by probe scanning from the skin at several points at 1, 3, 5, and 7 hr after FDG injection. TNRa (tumor-adjacent-normal ratio) and TNRc (tumor-contralateral-normal ratio) were calculated. Phantom study was also performed to determine basic GDP function. RESULTS: The patient study revealed that tumors showed constant TNRa (0.9-1.3) and TNRc (1.1-3.0) by GDP count rate, and that there was no tendency of an increase in TNRa with time. The standard deviations of GDP count rate were lower at 1-3 hr post-injection compared with those of delayed scans. While delayed PET showed an increase or no change in the tumor FDG uptake, the decrease of normal tissue FDG uptake was not adequate to create higher TNRs. The phantom study revealed that LN model showed TNRa of 1.7 or greater by GDP count rate (cps) when background contained no FDG, but that they showed TNRa of 1.3 or less when the background contained 4% of the LN FDG activity per ml. CONCLUSION: The present study suggests that higher FDG count rate of tumors at 1-3 hr postinjection would be more suitable for the gamma-probe detection compared with lower count rate at 6-7 hr delayed scans with wide standard deviations.
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