BIoE 1330 Ch 7-9

bioe-1330-ch-7-9

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310528

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The spatial resolution of a gamma camera can be improved by many factors, including:

Select the correct answer(s).

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Explanation

Decreasing the thickness of the crystal improves resolution, though it also decreases the efficiency of detection. The other options would actually decrease the spatial resolution of the camera

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Regarding different isotopes of the same element, the following are true: I. They have the same number of protons. II. They have the same atomic mass. III. They are chemically identical (ignoring present electron states).

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Explanation

They differ only in numbers of neutrons, which makes their atomic mass differ but not their chemical behavior

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. Which of the following statements is (are) true about the analysis of pulse height in the detection of gamma particles by Anger cameras? I - It permits rejection of Compton scattering. II - It permits rejection of multiple simultaneous gamma photons. III - It is also called Scintillation Spectrometry

Select the correct answer(s).

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Explanation

All are true.

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Which of the following is (are) true about SPECT and PET? I. Each has a corresponding projection modality. II. Each is a tomographic imaging modality based on the emission of gamma particles from within the patient. III. Each requires the use of collimators.

Select the correct answer(s).

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Explanation

PET is not based on a projection modality, though SPECT is. PET does not require the use of collimators, though SPECT does.

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. Which of the following is (are) true about the “line of stability” for nuclides? I. On coordinates of the number of neutrons vs the number of protons, it plots the most stable isotope of each element. II. At low atomic numbers it shows that the atomic mass tends to be twice the atomic number. III. At high atomic numbers, it shows that the number of neutrons tends to be smaller than the number of protons.

Select the correct answer(s).

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Explanation

At high atomic numbers the number of neutrons tends to be larger than the number of protons.

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The following are true of CT and Nuclear Medicine except, or all are true.

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Explanation

All are true.

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Metastable technetium, or Tc-99m, has some desirable properties for a radiotracer, including which of the following? I. It can be produced cheaply on the hospital site for immediate use. II. Its decay yields high-energy photons clustered around a particular energy, allowing for specific detection. III. Its half life is long enough to last through a study but short enough so that the patient can be discharged in a reasonable time

Select the correct answer(s).

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Explanation

All statements are true.

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Unlike in nuclear medicine, in X-ray based imaging modalities,

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Explanation

In nuclear medicine, attenuation is unwanted, since the total radioactivity is the desired imaging parameter. In CT or planar X-ray images, radiation is introduced from outside and attenuation measured.

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Which of the following statements is false about Anger cameras?

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Explanation

Individual gamma photons are indeed counted and located.

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Which of the following is (are) true about the “line of stability” for nuclides? I. Nuclear reactions tend to move towards it. II. Positron emitters are on one side of it, while beta emitters are on the other. III. At higher atomic number, it shows that the number of neutrons tends to be larger than the number of protons.

Select the correct answer(s).

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Explanation

All are true

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Which of the following statements about combined PET/CT scanners is false (or all are true)?

Select the correct answer(s).

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Explanation

The primarily anatomical higher-resolution information from the CT scanner is combined with the primarily physiological lower-resolution information from the PET scanner.

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Metastable technetium, or Tc-99m, has some desirable properties for a radiotracer, including which of the following? I. It can be produced cheaply on the hospital site for immediate use. II. Its decay yields high-energy electrons, known as “beta” particles. III. Its half life is long enough to last through a study but short enough so that the patient can be discharged in a reasonable time

Select the correct answer(s).

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Explanation

Statement II is false. This is an example of metastable isomeric transition, not beta-decay

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Which of the following statements about combined PET/CT scanners is false (or all are true)?

Select the correct answer(s).

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Explanation

: The primarily anatomical higher-resolution information from the CT scanner is combined with the primarily physiological lower-resolution information from the PET scanner.

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Which of the following statements is false about Anger cameras?

Select the correct answer(s).

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Explanation

Lead septa are indeed required to generate a projection image.

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The following are true about positron emitters, except, or all are true

Select the correct answer(s).

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Explanation

All are true.

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