Intraoperative Probe Spatial Resolution-CHAPTER 3
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Questions and Answers

How are spatial resolution and sensitivity related for a given detector?

  • They are directly proportional
  • They are not related
  • They are inversely proportional (correct)
  • They are both constant

    • What factor affects spatial resolution in the context of an intraoperative probe?

  • Battery check
  • Detected activity
  • Scattering medium (correct)
  • Energy window setting

    • What is the purpose of verifying the energy window setting before using an intraoperative probe with multiple radionuclides?

  • To ensure proper operation (correct)
  • To affect spatial resolution
  • To improve sensitivity
  • To perform constancy testing

    • What is the recommended frequency for calibrating semiconductor detectors?

    <p>Quarterly</p> Signup and view all the answers

    Which radionuclide is recommended for constancy testing of an intraoperative probe?

    <p>Cobalt-57</p> Signup and view all the answers

    What is the purpose of the amplifier gain tweaking during calibration?

    <p>To correlate the energy window with the gamma ray photopeak energy</p> Signup and view all the answers

    Why is checking the energy window visually not feasible for most intraoperative probes?

    <p>Unavailability of a multichannel analyzer display</p> Signup and view all the answers

    What problem might be indicated by a lower than expected constancy reading in intraoperative probes?

    <p>Contamination</p> Signup and view all the answers

    What is the purpose of extraneous radiation source in detector's line of sight troubleshooting procedure?

    <p>To troubleshoot lower than expected constancy reading</p> Signup and view all the answers

    Why is it important to test the probe's performance annually?

    <p>To ensure optimal function</p> Signup and view all the answers

    What effect does a scattering medium, such as tissue, have on spatial resolution in the context of an intraoperative probe?

    <p>It degrades spatial resolution</p> Signup and view all the answers

    How are spatial resolution and sensitivity related for a given detector in the context of an intraoperative probe?

    <p>They are inversely related</p> Signup and view all the answers

    What is the recommended radionuclide for constancy testing of an intraoperative probe, and why is it recommended?

    <p>Cobalt-57, due to its photon energies being close to that of Tc-99m</p> Signup and view all the answers

    Why is it important to verify the energy window setting before using an intraoperative probe with multiple radionuclides?

    <p>To ensure accurate detection of the targeted radionuclide</p> Signup and view all the answers

    What is the purpose of calibrating semiconductor detectors quarterly or semiannually?

    <p>To ensure the energy window is correctly centered on the photopeak</p> Signup and view all the answers

    Why is it challenging to visually check the energy window of most intraoperative probes?

    <p>The probes lack a multichannel analyzer display</p> Signup and view all the answers

    What problem might be indicated by a lower than expected constancy reading in intraoperative probes?

    <p>Energy window not correctly centered on photopeak</p> Signup and view all the answers

    In the context of semiconductor detectors, what is the purpose of a daily constancy check?

    <p>To maintain a consistent count rate capability</p> Signup and view all the answers

    Why are most intraoperative probes not equipped with a multichannel analyzer display?

    <p>To reduce the complexity and cost of the probes</p> Signup and view all the answers

    What is the purpose of the recommended quality control test for checking battery daily in semiconductor probes?

    <p>To maintain an optimal count rate capability</p> Signup and view all the answers

    What is the impact on spatial resolution if a scattering medium like tissue lies between the detector and the radiation source?

    <p>It degrades spatial resolution</p> Signup and view all the answers

    What does the operator need to remember about the probe's 'view' of the patient's tissue?

    <p>The probe 'sees' a solid column of tissue extending through the entire patient</p> Signup and view all the answers

    How are spatial resolution and sensitivity related for a given detector in the context of an intraoperative probe?

    <p>They are inversely related; an improvement in sensitivity results in a degradation of spatial resolution</p> Signup and view all the answers

    What is the impact on spatial resolution and sensitivity if there is a change that improves sensitivity in a given detector?

    <p>It degrades spatial resolution but improves sensitivity</p> Signup and view all the answers

    What is the purpose of calibrating semiconductor detectors quarterly or semiannually?

    <p>To ensure the preset energy window correlates with the gamma ray photopeak energy</p> Signup and view all the answers

    Why are most intraoperative probes not equipped with a multichannel analyzer display?

    <p>To make it challenging to visually check the energy window</p> Signup and view all the answers

    In the context of semiconductor detectors, what is the purpose of a daily constancy check?

    <p>To verify that the energy window is correctly centered on the photopeak</p> Signup and view all the answers

    What problem might be indicated by a lower than expected constancy reading in intraoperative probes?

    <p>Incorrect source-detector geometry</p> Signup and view all the answers

    What is the recommended radionuclide for constancy testing of an intraoperative probe, and why is it recommended?

    <p>$^{99m}$Tc, because of its wide clinical use and availability</p> Signup and view all the answers

    Why is checking the energy window visually not feasible for most intraoperative probes?

    <p>Because they lack a visual display for the energy window</p> Signup and view all the answers

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