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Journal of Nuclear Medicine

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Meeting ReportGeneral Clinical Specialties

Quantitative analysis with 123I-MIBG SPECT/CT for pheochromocytoma and paraganglioma

Ryusuke Nakamoto, Yuji Nakamoto, Takayoshi Ishimori, Koya Nakatani and Kaori Togashi
Journal of Nuclear Medicine May 2015, 56 (supplement 3) 147;
Ryusuke Nakamoto
1Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Yuji Nakamoto
1Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Takayoshi Ishimori
1Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Koya Nakatani
1Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Kaori Togashi
1Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Abstract

147

Objectives In 123I- MIBG scintigraphy, an inline SPECT/CT system allows us to get attenuation corrected SPECT images easily using CT data. The purpose of this retrospective study was to evaluate the diagnostic performance of quantitative analysis of 123I-MIBG-SPECT/CT in patients with suspected pheochromocytoma or paraganglioma.

Methods We analyzed 60 patients who were clinically suspected of having pheochromocytoma or paraganglioma, and underwent 123I-MIBG SPECT/CT scan between September 2009 and November 2014. Patients got an intravenous injection of 111 to 222 MBq 123I-MIBG, and SPECT/CT was performed at 6-h post-injection, in addition to obtaining planar images at 6-h and 24-h post-injection. A low-dose unenhanced CT was used for attenuation correction. On SPECT images, we measured SUVmax of retroperitoneal tumors, including pheochromocytoma, paraganglioma and normal organs using newly-developed software. We compared the SUVmax of pheochromocytoma and paraganglioma with that of other retroperitoneal lesions and physiological uptake of adrenal glands. In addition, the diagnostic performance of this technique was assessed by ROC analysis.

Results The mean ± standard deviation of SUVmax of pheochromocytomas and paragangliomas was 12.5±5.76, which was significantly higher (p<0.05) than that of other retroperitoneal lesions (4.46±1.63) and normal adrenal (4.60±1.40). The SUVmax of physiological uptake in parotid glands, submandibular glands, thyroid, heart, liver and adrenal glands was ranging from 7.55±4.38, 5.41±3.48, 9.31±4.23, 8.03±3.23, 14.7±5.06, and 4.60±1.40, respectively. When applying 7.9 as the optimal cut-off value, the sensitivity, specificity, and accuracy were 82.2%, 98.2% and 95.6%, respectively, with the area under the curve of 0.880.

Conclusions Quantitative approach in 123I-MIBG SPECT/CT was clinically feasible, and it demonstrated reasonably high diagnostic performance in differentiating pheochromocytoma and paraganglioma from other retroperitoneal pathology or physiological uptake in adrenal gland.

Research Support We have no research support.

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Journal of Nuclear Medicine
Vol. 56, Issue supplement 3
May 1, 2015
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Quantitative analysis with 123I-MIBG SPECT/CT for pheochromocytoma and paraganglioma
Ryusuke Nakamoto, Yuji Nakamoto, Takayoshi Ishimori, Koya Nakatani, Kaori Togashi
Journal of Nuclear Medicine May 2015, 56 (supplement 3) 147;

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Quantitative analysis with 123I-MIBG SPECT/CT for pheochromocytoma and paraganglioma
Ryusuke Nakamoto, Yuji Nakamoto, Takayoshi Ishimori, Koya Nakatani, Kaori Togashi
Journal of Nuclear Medicine May 2015, 56 (supplement 3) 147;
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