Research ArticleBrief Communication

The Need for Increased Awareness About Potential Quality Control Problems in Aging γ-Cameras

Sarah Frye, Ross Frye, Barbara Sterkel, Razi Muzaffar and Medhat M. Osman
Journal of Nuclear Medicine Technology September 2019, 47 (3) 223-226; DOI: https://doi.org/10.2967/jnmt.118.222489

Article Figures & Data

Figures

  • FIGURE 1.
    FIGURE 1.

    (A) Extrinsic QC uniformity image from detector 2 on August 15, 2016 (15 million counts, gray scale). (B) Extrinsic QC uniformity image from detector 2 on August 15, 2016 (15 million counts, thermal intensity increased to 91% [printed in gray scale]). (C) Intrinsic QC uniformity image from detector 2 on August 17, 2016, with mask removed (11.706 million counts, thermal intensity at 12% [printed in gray scale]). (D) Line graph of daily integral uniformity measurements of useful field of view (UFOV). (E) Image of Forte γ-camera at VA Saint Louis Healthcare System, John Cochran Division, St. Louis, MO (5).

  • FIGURE 2.
    FIGURE 2.

    (A) Photograph of windows and ceiling with fluorescent light in Forte γ-camera room. (B) Photograph of second window. (C) Photograph of third window (5). (D) Excerpt from Photonis PMT manual (7).

  • FIGURE 3.
    FIGURE 3.

    (A) Extrinsic QC uniformity image from detector 2 on August 18, 2016 (15 million counts, thermal intensity at 91% [printed in gray scale]), after detector rebuild. (B) Line graph showing QC problems again; arrow points to August 24, 2016, which was after first rebuild. (C) Extrinsic QC uniformity image from detector 2 on August 24, 2016 (15 million counts, thermal intensity at 91% [printed in gray scale]). Extensive modeling (arrows) across field of view is due to PMT excitation; tuning was done to remove modeling (5). UFOV = useful field of view.

  • FIGURE 4.
    FIGURE 4.

    (A) Extrinsic QC uniformity image from detector 2 on August 25, 2016 (15 million counts, thermal intensity at 91% [printed in gray scale]), after second tuning. (B) Line graph showing extrinsic useful field of view on August 25, 2016 (dashed arrow), and extrinsic QC uniformity on September 14, 2016 (solid arrow), which is when detector 2 might have needed another tuning. Another tuning was not needed per the QC results. (C) Intrinsic QC uniformity image from detector 2 on September 14, 2016 (15 million counts, thermal intensity at 91%). Extrinsic QC image was not captured on that day (5). UFOV = useful field of view.

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