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Nuclear Medicine and Molecular Imaging
Published in: Nuclear Medicine and Molecular Imaging 4/2015

01-12-2015 | Original Article

Comparison of Diagnostic Sensitivity and Quantitative Indices Between 68Ga-DOTATOC PET/CT and 111In-Pentetreotide SPECT/CT in Neuroendocrine Tumors: a Preliminary Report

Authors: Inki Lee, Jin Chul Paeng, Soo Jin Lee, Chan Soo Shin, Jin-Young Jang, Gi Jeong Cheon, Dong Soo Lee, June-Key Chung, Keon Wook Kang

Published in: Nuclear Medicine and Molecular Imaging | Issue 4/2015

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Abstract

Purpose

In-pentetreotide has been used for neuroendocrine tumors expressing somatostatin receptors. Recently, 68Ga-DOTATOC PET has been used with the advantage of high image quality. In this study, we compared quantitative indices between 111In-pentetreotide SPECT/CT and 68Ga-DOTATOC PET/CT.

Methods

Thirteen patients diagnosed with neuroendocrine tumors were prospectively recruited. Patients underwent 111In-pentetreotide scans with SPECT/CT and 68Ga-DOTATOC PET/CT before treatment. The number and location of lesions were analyzed on both imaging techniques to compare lesion detectability. Additionally, the maximal uptake count of each lesion and mean uptake count of the lungs were measured on both imagings, and target-to-normal lung ratios (TNR) were calculated as quantitative indices.

Results

Among 13 patients, 10 exhibited lesions with increased uptake on 111In-pentetreotide SPECT/CT and/or 68Ga-DOTATOC PET/CT. Scans with SPECT/CT detected 19 lesions, all of which were also detected on PET/CT. Moreover, 16 additional lesions were detected on PET/CT (6 in the liver, 9 in the pancreas and 1 in the spleen). PET/CT exhibited a significantly higher sensitivity than SPECT/CT (100 % vs. 54 %, P < 0.001). TNR was significantly higher on PET/CT than on SPECT/CT (99.9 ± 84.3 vs. 71.1 ± 114.9, P < 0.001) in spite of a significant correlation (r = 0.692, P = 0.01).

Conclusion

Ga-DOTATOC PET/CT has a higher diagnostic sensitivity than 111In-pentetreotide scans with SPECT/CT. The TNR on PET/CT is higher than that of SPECT/CT, which also suggests the higher sensitivity of PET/CT. 111In-pentetreotide SPECT/CT should be used carefully if it is used instead of 68Ga-DOTATOC PET/CT.
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Metadata
Title
Comparison of Diagnostic Sensitivity and Quantitative Indices Between 68Ga-DOTATOC PET/CT and 111In-Pentetreotide SPECT/CT in Neuroendocrine Tumors: a Preliminary Report
Authors
Inki Lee
Jin Chul Paeng
Soo Jin Lee
Chan Soo Shin
Jin-Young Jang
Gi Jeong Cheon
Dong Soo Lee
June-Key Chung
Keon Wook Kang
Publication date
01-12-2015
Publisher
Springer Berlin Heidelberg
Published in
Nuclear Medicine and Molecular Imaging / Issue 4/2015
Print ISSN: 1869-3474
Electronic ISSN: 1869-3482
DOI
https://doi.org/10.1007/s13139-015-0356-y

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