Questions

Answers

1. True or false: The overall accuracy of fluorodeoxyglucose positron emission tomography (FDG PET) imaging in the detection of Alzheimer disease (AD) is superior to that of single-photon emission computed tomography (SPECT)—with a sensitivity and specificity of 87% to 90% and 85% to 90%, respectively, as compared with 58% to 75% and 70% to 80%, respectively, for SPECT.

1. true

2. True or false: In general, the radio-tracer distribution pattern in AD is similar for SPECT and PET. Radiotracer activity is decreased in the posterior parietal and temporal lobes.

2. true

3. True or false: False-positive PET studies for AD are almost always caused by another type of dementia present in the patients evaluated.

3. true

4. True or false: At present, though PET and SPECT are not part of the routine workup of AD, they can be useful for detecting AD early, differentiating AD from other forms of dementia, and monitoring treatment response.

4. true

5.

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