Intraoperative Probe Spatial Resolution-CHAPTER 3

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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?

Quarterly Signup and view all the answers

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

Cobalt-57 Signup and view all the answers

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

To correlate the energy window with the gamma ray photopeak energy Signup and view all the answers

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

Unavailability of a multichannel analyzer display Signup and view all the answers

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

Contamination Signup and view all the answers

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

To troubleshoot lower than expected constancy reading Signup and view all the answers

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

To ensure optimal function 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?

It degrades spatial resolution Signup and view all the answers

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

They are inversely related Signup and view all the answers

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

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

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

To ensure accurate detection of the targeted radionuclide Signup and view all the answers

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

To ensure the energy window is correctly centered on the photopeak Signup and view all the answers

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

The probes lack a multichannel analyzer display Signup and view all the answers

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

Energy window not correctly centered on photopeak Signup and view all the answers

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

To maintain a consistent count rate capability Signup and view all the answers

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

To reduce the complexity and cost of the probes Signup and view all the answers

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

To maintain an optimal count rate capability 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?

It degrades spatial resolution Signup and view all the answers

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

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

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

They are inversely related; an improvement in sensitivity results in a degradation of spatial resolution 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?

It degrades spatial resolution but improves sensitivity Signup and view all the answers

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

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

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

To make it challenging to visually check the energy window Signup and view all the answers

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

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

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

Incorrect source-detector geometry Signup and view all the answers

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

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

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

Because they lack a visual display for the energy window Signup and view all the answers

Intraoperative Probe Spatial Resolution-CHAPTER 3

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Questions and Answers

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

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

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

What is the recommended frequency for calibrating semiconductor detectors?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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