What is attenuation correction in SPECT?

What is attenuation correction in SPECT?

Attenuation correction is a mechanism that removes soft tissue artifacts from SPECT images. The size of the patient and the amount of tissue between the heart and the detector lead to attenuation artifacts that adversely affect the image of the heart.

What is attenuation correction pet?

This loss of detection of true coincidence events is called attenuation. It is lower in the body surface than deep in the body, low in lungs, and especially high in dense tissues such as bones, leading to severe artifacts in PET image, unless it is corrected during image reconstruction.

What does attenuation artifact mean?

“Attenuation artifact” observed in a nuclear stress test is due to the reduction in the intensity / strength of signal when it travels through various body tissues of different densities, such as breast tissues, chest wall, and organs under the diaphragm.

What is attenuation map?

Reliable attenuation correction methods for emission tomography require determination of an attenuation map, which represents the spatial distribution of linear attenuation coefficients for the region of the patient’s anatomy that is included in the radionuclide imaging study.

What is attenuation on CT?

PHYSICS OF CT The density of the tissue is in proportion to the attenuation of the x-rays which pass through. Tissues like air and water have little attenuation and are displayed as low densities (dark), whereas bone has high attenuation and is displayed as high density (bright) on CT.

What does soft tissue attenuation mean?

After a stress test, your physician may mention that you have “soft tissue artifact,” or “soft tissue attenuation.” What this means is that soft tissue, such as breast tissue, is showing up on the image created by the stress test.

What does low attenuation mean on CT?

Attenuation is a feature of CT, and low attenuation means that a particular area is less intense than the surrounding.