Questions: Which procedure visualizes tissues and organs after administration of a radionuclide? A. Lumbosacral radiography B. Discography C. Myelography D. Densitometry E. Scintigraphy

The answer is the fifth one (E): Scintigraphy.

Explanation for each option:

A. Lumbosacral radiography: This is an imaging technique that uses X-rays to visualize the lumbosacral region of the spine. It does not involve the administration of a radionuclide.

B. Discography: This is a diagnostic procedure used to evaluate back pain. It involves injecting a contrast dye into the spinal discs and using X-ray or CT imaging. It does not use radionuclides.

C. Myelography: This procedure involves the injection of a contrast dye into the spinal canal to visualize the spinal cord and nerve roots using X-ray or CT imaging. It does not involve radionuclides.

D. Densitometry: This is a technique used to measure bone density, often using X-rays or other forms of radiation, but it does not involve the use of radionuclides.

E. Scintigraphy: This is a diagnostic technique that involves the administration of a radionuclide, which emits gamma rays. The emitted radiation is captured by a gamma camera to create images of tissues and organs, making it the correct answer.

In summary, scintigraphy is the procedure that visualizes tissues and organs after the administration of a radionuclide.