Positron emission tomography

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/positron-emission-tomography

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is a PET scan?A PET scan is a special camera that looks inside the body to see how cells work. It uses tiny radioactive molecules that travel to the places the doctor wants to check. The machine records the light that comes out when the molecules give off particles.
2. How does a PET scan find problems inside the body?The PET scanner watches for pairs of bright flashes that come from the same spot in the body. Those flashes happen when a tiny particle called a positron meets an electron and turns into two gamma rays that go in opposite directions. By finding many of those pairs, the machine builds a 3‑D picture of where the radioactive molecules are.

Radiopharmaceutical: A compound containing a radioactive isotope used for diagnostic or therapeutic purposes in medicine.
Beta-plus Decay: A type of radioactive decay where a proton in the nucleus is converted into a neutron, emitting a positron and a neutrino.
Annihilation Coincidence Detection: The simultaneous detection of two gamma rays emitted 180 degrees apart from a positron-electron annihilation event.
Quantitative Imaging: Medical imaging that provides numerical data about the concentration or distribution of a substance within the body.