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A variable angle slant-hole collimator.

R H Moore, N M Alpert, H W Strauss

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |January 1, 1983
    PubMed
    Summary
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    A novel variable-angle slant-hole (VASH) collimator was successfully constructed using stacked, photoetched tungsten plates. This innovative design allows for adjustable channel inclinations, demonstrating feasibility for adaptable gamma camera imaging systems.

    Area of Science:

    • Medical Imaging
    • Nuclear Medicine
    • Instrumentation

    Background:

    • Gamma camera collimators are crucial for SPECT imaging, influencing image resolution and sensitivity.
    • Traditional collimators have fixed angles, limiting their adaptability to different imaging scenarios.
    • Developing variable-angle collimators can enhance imaging flexibility and performance.

    Purpose of the Study:

    • To demonstrate the feasibility of constructing a variable-angle slant-hole (VASH) collimator.
    • To evaluate the performance characteristics (resolution and sensitivity) of the VASH collimator at various angles.
    • To compare the VASH collimator's performance with a general-purpose (GAP) collimator.

    Main Methods:

    • Constructed a VASH collimator using 160 photoetched tungsten plates (0.125 mm thick) stacked to 2.0 cm height.

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  • Engineered a holder allowing plates to shear, achieving channel inclinations from 0 to 40 degrees.
  • Assessed resolution using a Tc-99m line source and sensitivity using a point source, measuring performance across and along shear directions.

    • Main Results:

    • The VASH collimator achieved a resolution of 1.1 cm FWHM at 0-degree slant, which remained consistent up to 40 degrees.
    • Resolution was comparable in both across and along shear directions.
    • Sensitivity at 0-degree slant was 169 cps/MBq, slightly lower than the GAP collimator's 205 cps/MBq.

    Conclusions:

    • A variable-angle slant-hole collimator can be effectively constructed from laminated, photoetched plates.
    • The VASH collimator maintains consistent resolution across a range of slant angles.
    • This technology shows promise for adaptable and potentially improved gamma camera imaging.