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Positron emission tomography–computed tomography (better known as PET-CT or PET/CT) is a nuclear medicine technique which combines, in a single gantry, a positron emission tomography (PET) scanner and an x-ray computed tomography (CT) scanner, to acquire sequential images from both devices in the same session, which are combined into a single superposed (co-registered) image.
Complete body PET-CT fusion image Brain PET-MRI fusion image. PET scans are increasingly read alongside CT or MRI scans, with the combination (co-registration) giving both anatomic and metabolic information (i.e., what the structure is, and what it is doing biochemically). Because PET imaging is most useful in combination with anatomical ...
Nuclear medicine imaging studies are generally more organ-, tissue- or disease-specific (e.g.: lungs scan, heart scan, bone scan, brain scan, tumor, infection, Parkinson etc.) than those in conventional radiology imaging, which focus on a particular section of the body (e.g.: chest X-ray, abdomen/pelvis CT scan, head CT scan, etc.).
Opting for an alternative type of scan without contrast might result in a 10 to 20 percent reduction in diagnostic accuracy, he said. Other sources of the dye are limited, however.
Types include positron emission tomography (PET) and Single-photon emission computed tomography (SPECT). SPECT is commonly used to diagnose certain diseases. [ 1 ] SPECT imaging is conducting by injecting a radioactive probe (or tracer) into the person's blood stream. [ 1 ]
PET images can be viewed in comparison to computed tomography scans to determine an anatomic correlate. Modern scanners may integrate PET, allowing PET-CT, or PET-MRI to optimize the image reconstruction involved with positron imaging. This is performed on the same equipment without physically moving the patient off of the gantry.
THz-CT Thermoacoustic imaging: Photoacoustic spectroscopy: TAT Ultrasound-modulated optical tomography: Ultrasound: UOT Ultrasound computer tomography: Ultrasound: USCT Ultrasound transmission tomography: Ultrasound: X-ray computed tomography: X-ray: CT, CAT scan 1971 X-ray microtomography [15] X-ray: microCT Zeeman-Doppler imaging: Zeeman effect
Contrast agents can also be injected to study blood flow. However, contrast agents for micro-CT, such as iodine, are difficult to conjugate molecular targets1 with, and thus it is rarely used in molecular imaging techniques. As such, micro-CT is often combined with micro-PET/SPECT for anatomical and molecular imaging in research. [14]
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