Nuclear Medicine is defined as that
branch of medicine in which radioactive materials (unsealed sources of
radiation) are used for the diagnosis and treatment of disease.
It is a medical specialty that uses small
amounts of radioactive materials, known as radiopharmaceuticals, for
diagnostic, therapeutic, and research purposes. These radiopharmaceuticals are
specific for the organ, tumor or tissue, which needs to be studied.
Once injected into a patient these
radiopharmaceuticals localize in the area of interest, which is then imaged
using a special camera. Highly simplified, it is something like taking an X-ray
from the inside out. Nuclear Medicine provides unique information about both
structure and function of nearly every human organ.
It is the ability to characterize and
quantify physiologic function that makes nuclear medicine different from an
X-ray / CT or MRI. As radiopharmaceuticals become more sophisticated, it is
becoming possible to see inside of human beings at the molecular level. Nuclear
medicine technology is a highly patient-oriented field.
It is a vigorous, dynamic field that has
seen dramatic growth over the past two decades and is expected to grow even
more in the near future. New radiopharmaceuticals and imagining technologies
are continually being developed.
Diagnostic imaging of the lungs, brain,
thyroid, stomach, salivary glands, liver, kidneys, bone, heart, adrenal glands
as well as sites of occult infection, is achieved using a sophisticated Gamma
Camera with tomographic facilities linked to computer systems.
Non-imaging procedures e.g. thyroid
uptake tests, GFR estimations and hematological tests are also performed
Nuclear medical procedures are safe, both for the patient and the physicians
and technologist performing the tests. Patients experience little or no
discomfort and do not require anesthesia.
Exposure to radioactivity is monitored
closely, and kept well below safety limits. The radiation exposure is usually
as much and often lowers than the exposure produced by a similar radiological
study such as CT.
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