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Single photon emission computed tomography (SPECT) |
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Single photon emission computed
tomography (SPECT) is a nuclear medicine tomographic
imaging technique using gamma rays.
It is very similar to conventional
nuclear medicine planar imaging using a gamma
camera. |
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However, it is able to provide
true 3D information.This information is typically
presented as cross-sectional slices through the patient,
but can be freely reformatted or manipulated as
required.
SPECT imaging is performed by
using a gamma camera to acquire multiple 2-D images
(also called projections), from multiple angles. A
computer is then used to apply a tomographic
reconstruction algorithm to the multiple projections,
yielding a 3-D dataset. This dataset may then be
manipulated to show thin slices along any chosen axis of
the body, similar to those obtained from other
tomographic techniques, such as MRI, CT, and PET. |
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Application: SPECT can be used to complement any
gamma imaging study, where a true 3D representation can be
helpful. e.g. tumor imaging, infection (leukocyte)
imaging, thyroid imaging or bone imaging.
Because SPECT permits accurate localisation in 3D space, it
can be used to provide information about localised function
in internal organs. e.g. functional cardiac or brain
imaging.
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Radioimmunoassay (RIA) |
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Radioimmunoassay (RIA) is a scientific method used to
test antigens (for example, hormone levels in the
blood) without the need to use a bioassay. |
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It involves mixing known quantities of radioactive
antigen (frequently labeled with gamma-radioactive
isotopes of iodine attached to tyrosine) with antibody
to that antigen, then adding unlabeled or "cold" antigen
and measuring the amount of labeled antigen displaced. |
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What's
new
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Copyright © 2005,
www.cnmumym.org
All rights reserved
Centre For Nuclear Medicine and Ultrasound (CNMU), Post Box No-47,
Mymensingh-2200, Bangladesh
Site
design : Mizanur Rahman (AE), BAEC, e-mail:
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