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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Functional imaging</span></span>
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</style><table class="infobox"><tbody><tr><th colspan="2" class="infobox-above" style="background-color: lightblue">Functional imaging</th></tr><tr><th scope="row" class="infobox-label">Purpose</th><td class="infobox-data">measuring changes in metabolism</td></tr></tbody></table>
<p><b>Functional imaging</b> (or <b>physiological imaging</b>) is a <a href="Medical_imaging" title="Medical imaging">medical imaging</a> technique of detecting or measuring changes in <a href="Metabolism" title="Metabolism">metabolism</a>, blood flow, regional chemical composition, and absorption.
</p><p>As opposed to structural imaging, functional imaging centers on revealing <a href="Physiological" class="mw-redirect" title="Physiological">physiological</a> activities within a certain tissue or organ by employing medical image modalities that very often use <a href="Radioactive_tracers" class="mw-redirect" title="Radioactive tracers">tracers</a> or probes to reflect spatial distribution of them within the body. These tracers are often <a href="Structural_analog" title="Structural analog">analogous</a> to some chemical compounds, like glucose, within the body. To achieve this, isotopes are used because they have similar chemical and biological characteristics. By appropriate proportionality, the <a href="Nuclear_medicine_physician" title="Nuclear medicine physician">nuclear medicine physicians</a> can determine the real intensity of certain substances within the body to evaluate the risk or danger of developing some diseases.
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<div class="mw-heading mw-heading2"><h2 id="Modalities">Modalities</h2></div>
<ul><li><a href="Positron_emission_tomography" title="Positron emission tomography">Positron emission tomography</a> (PET)
<ul><li><a href="Fludeoxyglucose" class="mw-redirect" title="Fludeoxyglucose">Fludeoxyglucose</a> for Glucose metabolism</li>
<li>O-15 as a flow tracer</li></ul></li>
<li><a href="Single-photon_emission_computed_tomography" title="Single-photon emission computed tomography">Single-photon emission computed tomography</a> (SPECT)</li>
<li><a href="X-ray_computed_tomography" class="mw-redirect" title="X-ray computed tomography">Computed tomography (CT) perfusion imaging</a></li>
<li><a href="Functional_magnetic_resonance_imaging" title="Functional magnetic resonance imaging">Functional magnetic resonance imaging</a> (fMRI)
<ul><li><a href="Blood-oxygen-level_dependent" class="mw-redirect" title="Blood-oxygen-level dependent">BOLD</a></li>
<li><a href="Diffusion_MRI" class="mw-redirect" title="Diffusion MRI">Diffusion MRI</a></li>
<li><a href="Perfusion" title="Perfusion">Perfusion (blood flow)</a></li>
<li><a href="Arterial_spin_labeling" class="mw-redirect" title="Arterial spin labeling">Arterial spin labeling MRI</a></li>
<li>Blood volume</li>
<li><a href="Hyperpolarized_carbon-13_MRI" title="Hyperpolarized carbon-13 MRI">Hyperpolarized carbon-13 MRI</a></li></ul></li>
<li><a href="Photoacoustic_imaging_in_biomedicine" class="mw-redirect" title="Photoacoustic imaging in biomedicine">Functional photoacoustic microscopy</a> (fPAM)</li>
<li><a href="Magnetic_particle_imaging" title="Magnetic particle imaging">Magnetic particle imaging</a> (MPI)</li>
<li><a href="Optical_imaging" class="mw-redirect" title="Optical imaging">Optical imaging</a>
<ul><li><a href="Near-infrared_spectroscopy" title="Near-infrared spectroscopy">Near-infrared spectroscopy</a> (NIRS)</li></ul></li></ul>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Biomedical_engineering" title="Biomedical engineering">Biomedical engineering</a></li>
<li><a href="Medical_imaging" title="Medical imaging">Medical imaging</a></li>
<li><a href="PET-CT" class="mw-redirect" title="PET-CT">PET-CT</a></li>
<li><a href="Radiology" title="Radiology">Radiology</a></li>
<li><a href="Functional_neuroimaging" title="Functional neuroimaging">Functional neuroimaging</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://www.scholarpedia.org/article/Functional_imaging">Scholarpedia Functional imaging</a></li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
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