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Research ArticleImaging

Parathyroid Imaging: The Importance of Pinhole Collimation with Both Single- and Dual-Tracer Acquisition

William C. Klingensmith, Phillip J. Koo, Adam Summerlin, Bradley W. Fehrenbach, Ramesh Karki, Benjamin C. Shulman, Christopher D. Raeburn and Robert C. McIntyre
Journal of Nuclear Medicine Technology June 2013, 41 (2) 99-104; DOI: https://doi.org/10.2967/jnmt.112.118208
William C. Klingensmith III
1Division of Nuclear Medicine, Department of Radiology, University of Colorado School of Medicine, Aurora, Colorado
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Phillip J. Koo
1Division of Nuclear Medicine, Department of Radiology, University of Colorado School of Medicine, Aurora, Colorado
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Adam Summerlin
1Division of Nuclear Medicine, Department of Radiology, University of Colorado School of Medicine, Aurora, Colorado
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Bradley W. Fehrenbach
1Division of Nuclear Medicine, Department of Radiology, University of Colorado School of Medicine, Aurora, Colorado
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Ramesh Karki
1Division of Nuclear Medicine, Department of Radiology, University of Colorado School of Medicine, Aurora, Colorado
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Benjamin C. Shulman
2Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, Colorado; and
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Christopher D. Raeburn
3Division of GI, Tumor, and Endocrine Surgery, Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado
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Robert C. McIntyre Jr.
3Division of GI, Tumor, and Endocrine Surgery, Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado
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  • FIGURE 1.
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    FIGURE 1.

    Pinhole collimator (A) and parallel-hole collimator (B) images of 99mTc-sestamibi at 15 min and 3 h, and image of 99mTc-sestamibi minus 123I at 15 min, in patient with hyperparathyroidism and 380-mg parathyroid adenoma located inferiorly on right. With pinhole collimation, 2 observers correctly localized adenoma without and with subtraction image with degree-of-certainty grades of 2 and 3 for one observer and 3 and 3 for the other. With parallel-hole collimation, observers did not identify adenoma without subtraction image and did localize adenoma with subtraction image with grades of 1 and 1.

  • FIGURE 2.
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    FIGURE 2.

    Pinhole collimator (A) and parallel-hole collimator (B) images of 99mTc-sestamibi at 15 min and 3 h, and image of 99mTc-sestamibi minus 123I at 15 min, in patient with hyperparathyroidism and 1,010-mg parathyroid adenoma located inferiorly on right. With pinhole collimation, 2 observers correctly localized adenoma without and with subtraction image with degree-of-certainty grades of 3 and 2 for one observer and 3 and 3 for the other. With subtraction image, one observer located adenoma at middle level whereas other localizations were all inferior. With parallel-hole collimation, only one observer identified adenoma without subtraction image, grades of 0 and 1, and both observers localized adenoma with subtraction image with grades of 1 and 1.

  • FIGURE 3.
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    FIGURE 3.

    Performance for each of 4 protocols is shown for correctly localizing position of 37 parathyroid adenomas in 33 patients. Data represent average results for 2 observers.

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    TABLE 1

    Grading Results for Each of 4 Protocols for 37 Adenomas in 33 Patients

    Degree of certainty of location†
    ProtocolObserver0123
    ST-DPA19765
    PinholeB616 (9)8 (1)7
    ST-DPA255 (1)43
    ParallelB178 (7)84
    ST-DP + SA811 (2)6 (3)12 (2)
    PinholeB413 (7)1010
    ST-DP + SA167 (1)7 (1)7 (1)
    ParallelB1212 (2)94
    • ↵† 0 = no adenoma seen; 1 = possible adenoma; 2 = probable adenoma; 3 = definite adenoma.

    • Numbers in parentheses indicate number of localizations that were incorrect.

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    TABLE 2

    Localization Success for Each of 4 Protocols

    Localization success
    ProtocolObserverAdenomasCorrect95% CI
    ST-DPA18/370.490.32–0.66
    PinholeB31/370.840.68–0.94
    ST-DPA12/370.320.18–0.50
    ParallelB20/370.540.37–0.71
    ST-DP + SA29/370.780.62–0.90
    PinholeB33/370.890.75–0.97
    ST-DP + SA21/370.570.39–0.73
    ParallelB25/370.680.50–0.82
    • CI = exact binomial confidence interval.

    • There were 37 adenomas in 33 patients.

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Journal of Nuclear Medicine Technology: 41 (2)
Journal of Nuclear Medicine Technology
Vol. 41, Issue 2
June 1, 2013
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Parathyroid Imaging: The Importance of Pinhole Collimation with Both Single- and Dual-Tracer Acquisition
William C. Klingensmith, Phillip J. Koo, Adam Summerlin, Bradley W. Fehrenbach, Ramesh Karki, Benjamin C. Shulman, Christopher D. Raeburn, Robert C. McIntyre
Journal of Nuclear Medicine Technology Jun 2013, 41 (2) 99-104; DOI: 10.2967/jnmt.112.118208

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Parathyroid Imaging: The Importance of Pinhole Collimation with Both Single- and Dual-Tracer Acquisition
William C. Klingensmith, Phillip J. Koo, Adam Summerlin, Bradley W. Fehrenbach, Ramesh Karki, Benjamin C. Shulman, Christopher D. Raeburn, Robert C. McIntyre
Journal of Nuclear Medicine Technology Jun 2013, 41 (2) 99-104; DOI: 10.2967/jnmt.112.118208
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