Exam 16: Positron Emission Tomographycomputed Tomography Scanners

The most commonly used radiopharmaceutical for positron emission tomographic imaging is:

If the nucleus contains too many protons, it may emit a: I. positive beta particle II. positron III. proton

¹⁸F-2- fluoro-2-deoxy-D-glucose (FDG) positron emission tomography has not been useful in the localization of epileptic seizures.

The availability of interplane septa allows for the acquisition of positron emission tomography data in two-dimensional mode, which substantially reduces the amount of interplane scatter.

When using FDG for a whole body scan, the uptake waiting period is usually:

In emission imaging an external, photon emitting source rotates about the patient to acquire a(n):

A modern positron emission tomography scanner might contain tens of thousands of small scintillating detectors.

Radioactive fluorine can be chemically substituted for a: I. hydrogen atom II. hydroxyl group III. deoxyglucose

Clinical examples of positron emission tomographic imaging include: I. cardiac studies II. epilepsy studies III. oncology studies

A positron has the same mass as an electron but has a positive rather than a negative charge.

The use of contrast media in computed tomography can lead to artifacts in the reconstructed positron emission tomography data.

One approach to reducing scatter includes introducing __________ between detection rings.

The probability of detecting the photons from an annihilation event from one center of an object is less than that for an event on the periphery.

Another approach to attenuation correction in positron emission tomography is to use the data from a magnetic resonance imaging scan that are registered to the positron emission tomography data.

A disadvantage of using isotopes such as ¹⁵O, ¹³N, and ¹¹C are their:

The ring diameter of most clinical positron emission tomography scanners is about:

The crystals in the construction of a positron emission tomography scanner's detectors are:

Which of the following only looks at the ratio of events acquired with and without the patient in place?

A transmission scan is first acquired without the patient in place, which is called a:

Positron emission tomography with ¹⁸F-2- fluoro-2-deoxy-D-glucose (FDG) is a useful tool in the initial diagnosis, staging, and follow-up of lung cancer.