Positron emission tomography (PET) is a test that uses a special type of camera and a tracer (radioactive chemical) to look at organs in the body. The tracer usually is a special form of a substance (such as glucose) that collects in cells that are using a lot of energy, such as cancer cells.
The Eleventh Amendment was ratified in 1798 in order to overrule the Supreme Courtâs decision that a South Carolina citizen could sue the state of Georgia for money damages.he Eleventh Amendment was ratified in 1798 in order to overrule the Supreme Courtâs decision that a South Carolina citizen could sue the state of Georgia for money damages.
A+E Networks. The 21st Amendment to the U.S. Constitution is ratified, repealing the 18th Amendment and bringing an end to the era of national prohibition of alcohol in America.At 5:32 p.m. EST, Utah became the 36th state to ratify the amendment, achieving the requisite three-fourths majority of statesâ approval.+E Networks. The 21st Amendment to the U.S. Constitution is ratified, repealing the 18th Amendment and bringing an end to the era of national prohibition of alcohol in America. At 5:32 p.m. EST, Utah became the 36th state to ratify the amendment, achieving the requisite three-fourths majority of statesâ approval.