In the context of imaging techniques, which of the following is true of positron emission tomography?
A. It involves the intravenous introduction of a radioactive tracer, such as technetium-99.
B. It is a nuclear medicine imaging technique that uses an injection of a radioactive tracer chemical to produce a three-dimensional (3-D) image.
C. An opaque dye introduced into the spinal canal through a lumbar puncture helps the physician detect conditions such as tumors, nerve root compression, and disk disease, as well as other diseases within the spinal cord.
D. An X-ray examination helps the physician identify fractures and dislocations or any bone abnormality that may be present.
Answer: B
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