How is radiation dose defined in nuclear medicine?

Radiation dose in nuclear medicine refers specifically to the amount of radiation absorbed by the body from a radiopharmaceutical. This definition is essential because it focuses on the actual biological impact of the radiation administered for diagnostic or therapeutic purposes. Understanding the absorbed dose is critical for assessing the potential risks and benefits associated with radiopharmaceuticals, as it directly relates to how much radiation the tissues will experience and the subsequent biological effects, such as potential harm or therapeutic outcomes.

The concept of absorbed dose is different from simply measuring the total radiation emitted from a radiopharmaceutical, which does not account for what is actually taken up by the tissue. Similarly, knowing the quantity of radioactive material used or the cumulative radiation exposure from all past treatments provides useful context but does not specifically denote the dose that affects the patient’s body during a single procedure. Focusing on the absorbed dose helps ensure that medical professionals can make informed decisions regarding patient safety and treatment efficacy.