Imaging Glioma Extent with 131I-TM-601
David C. Hockaday, BS1,
Sui Shen, PhD2,
John Fiveash, MD2,
Andrew Raubitschek, MD3,
David Colcher, PhD3,
An Liu, PhD3,
Vern Alvarez, PhD4 and
Adam N. Mamelak, MD1
1 Neurosurgery Section, Department of General and Oncological Surgery, City of Hope Cancer Center, Duarte, California
2 Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, Alabama
3 Department of Radio-Immunotherapy, Beckman Research Institute, City of Hope Cancer Center, Duarte, California
4 Transmolecular, Inc., Birmingham, Alabama

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FIGURE 1. Total-body planar images show distribution of 131I-TM-601 immediately after injection (A) and 8 d later (B). Long-term retention of radioactivity at tumor site, with nearly complete elimination elsewhere, was observed in all patient scans. The 7.4-MBq (200 µCi) standard is at bottom.
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FIGURE 2. Graph of average SPECT decay shows that normalized intensity of brightest voxel averaged over all patients drops significantly in 2 d. Expon. = exponential physical decay of 7.4-MBq (200 µCi) sample of 131I-Tm-601 standard over data collection period.
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FIGURE 3. Comparison of T1-Wc MRI-, T2-weighted MRI-, and SPECT-determined tumor volume estimates on day 2.
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FIGURE 4. Comparison of T1-weighted MRI-, T2-weighted MRI-, and SPECT-determined tumor volume estimates on day 8. SPECT day 2 estimates exhibit more uncertainty and generally larger volumes than those on day 8. SPECT day 8 estimates are more centered (but still closer to T2 estimate) and more reliable.
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FIGURE 5. Axial view of T1-Wc (A), coregistered (B), and SPECT (day 8) images.
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FIGURE 6. Coregistered MR/SPECT images for patient 5 on day 2 (A), day 3 (B), and day 8 (C) after injection.
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Copyright © 2005 by the Society of Nuclear Medicine.