Lecture on Radiopharmaceuticals

These flashcards cover key vocabulary and concepts from the lecture on radiopharmaceuticals, focusing on their definitions, applications, production, and mechanisms.

1. Radiopharmaceuticals

Compounds that portray physiology, biochemistry, or pathology of a body system without causing any perturbation of function.

Combination of:

1. Radionuclide - radioactive molec. that permits external detection

2. Pharmaceutical - biologically active molecule or drug that acts as a carrier and determines localisation and distribution in the body

Radiotracers

Radioactive substances used in radiopharmaceuticals to trace specific physiological or pathologic processes in the body.

Radionuclides

Unstable nuclides that are radioactive and can emit radiation.

Atomic Number

The number of protons in an atom's nucleus, determining the chemical properties of the element.

Mass Number

The total number of protons and neutrons in an atomic nucleus.

SPECT

Single Photon Emission Computed Tomography, a type of nuclear imaging technique.

PET

Positron Emission Tomography, a nuclear medicine functional imaging technique that produces a three-dimensional image.

Beta Emitters

Radionuclides that emit beta particles during radioactive decay.

Alpha Emitters

Radionuclides that emit alpha particles during radioactive decay.

Positron Emission Tomography (PET)

A major tool in nuclear medicine, primarily using 18F for imaging various tissues and tumors.

Tc-99m

Technetium-99m, a widely used radionuclide in nuclear medicine for diagnostic imaging.

Half-life

The time required for half of a radioactive substance to decay.

Generator Production of Radionuclides

A method where a parent radionuclide decays to produce a daughter radionuclide.

Gamma Photons

High-energy photons emitted during radioactive decay, important for imaging in nuclear medicine.

Neutron Activation

A process by which stable isotopes are made radioactive by the absorption of neutrons.

Radiopharmaceuticals for Therapy

Radiopharmaceuticals designed to treat diseases rather than just diagnose them.

Cyclotron Products

Radionuclides produced by bombarding target nuclides with protons in a cyclotron.

Neutron Bombardment

The process of using neutrons to produce isotopes in nuclear reactors.

Receptor Binding

A mechanism of radiopharmaceutical localization where the agent binds to specific receptors on cells.

Chemical Purity

The fraction of the desired radionuclide in a radiopharmaceutical preparation.

Biological Purity

Absence of microorganisms and pyrogens in a radiopharmaceutical preparation.

Radiopharmaceutical Applications

Specific uses of radiopharmaceuticals in detecting or treating various diseases.

Glucose Metabolism in PET

FDG is trapped in tumor cells, allowing imaging of metabolic activity.

Therapeutic Radionuclides

Radionuclides used in therapeutic applications to target specific tissues.

Radiochemical Purity

The fraction of total radioactivity in the desired chemical form.

Diagnostic Radiopharmaceuticals

Radiolabeled molecules designed to produce images of specific disease sites.

Active Transport Mechanism

A process by which radiopharmaceuticals are actively taken up by cells.

Passive Diffusion Mechanism

The movement of radiopharmaceuticals across cell membranes without energy use.

Phagocytosis Mechanism

The process by which cells engulf particles to localize radiopharmaceuticals.

Second Generation Radiopharmaceuticals

Innovative agents designed for improved imaging in nuclear medicine.

Auger Electron Emitters

Radionuclides that emit low-energy electrons during decay, used in targeted therapy.

Antigen Targeting in Therapy

Using antibodies targeting specific antigens for therapeutic radionuclide delivery.

Iodine-131

A radionuclide used for thyroid diagnosis and therapy.

Technetium-99m as a Tracer

Used in various imaging procedures due to its favorable half-life and emission properties.

Molecular Imaging

The process of visualizing biological processes at the molecular and cellular levels using radiopharmaceuticals.