“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. This may give rise to an apparent “abnormality” in an otherwise normal nuclear stress test.
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What is diaphragmatic breathing artifact?
In healthcare imaging (CT scan), artifact is a misrepresentation of tissue structure. Simply put, it could appear you have a tumor when you actually don't because some artifact changed the image in some way. Diaphragmatic breathing is a fancy way ...
What does attenuation factor mean?
Attenuation is a loss of signal strength measured in dB that reduces a connection’s maximum speed available due to the need for multiple repeat transmissions. Ultimately the attenuation you experience – and how it impacts your business – depends on the distance between you and your C/O. The further the distance, the lower your available ...
What is quality artifact?
What is Signal Quality?
- Signal Quality & Artifacts. Signal Quality refers to how "clean" or true the RR data is as captured by your heart rate monitor. ...
- Artifact Correction. Because of the high degree of accuracy needed to calculate a valid HRV, the signal quality is very important.
- Signal Quality Rating. ...
- Improving Signal Quality. ...
What are artifacts on a stress test?
Answer • An artifact, in this context, is anything that can keep the test from being interpreted correctly. People often think of medical tests as definitive — the stress test shows that either you have blockages in the arteries in your heart or you don't — but it usually is not so clear.
What is mild breast attenuation artifact?
Attenuation artifacts are the most common sources of error in myocardial single-photon emission computed tomography (SPECT) imaging. Breast artifacts are the most frequent causes of false positive planar images in female subjects.
What is attenuation in SPECT?
In SPECT imaging, attenuation is also an important factor. As the emission photon from PET and SPECT tracers travel through the body it can be absorbed or scattered; the combination of these interactions is described as the linear attenuation of the photons.
What is soft tissue attenuation artifact?
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 is attenuation in PET scan?
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 is attenuation correction SPECT CT?
Attenuation correction is a mechanism that removes soft tissue artifacts from SPECT images. Attenuation artifacts vary among patients, but the most common corrections are to artifacts associated with breast attenuation in women and diaphragmatic attenuation in men.
Why are attenuation corrections important in clinical SPECT scans?
Attenuation-corrected SPECT images have demonstrated the ability to better detect areas of viable myocardium, correlate better with positron emission tomography imaging, and provide improved prediction of functional recovery after revascularization.
What is increased attenuation?
The increased lung attenuation pattern develops when the amount of air in the airspaces and in the lumen of the airways decreases (resulting from lung volume decrease or from partial or total filling of the airspaces) and when the soft tissue structures increase in size and/or amount, two phenomena that often occur ...
What is research attenuation?
Attenuation is a statistical concept that refers to underestimating the correlation between two different measures because of measurement error. Because no test or other measurement of any construct has perfect reliability, the validity of the scores between predictor and criterion will decrease.
What are soft tissue artifacts?
The soft tissue artifact (STA) is a phenomenon occurring when the motion of bones or anatomical segments is measured by means of skin markers: the biological tissues between the markers and the bone produce a relative motion bone-markers that leads to inaccuracies in the estimation of rigid body poses or kinematics.
What is an artifact in your heart?
Electrocardiographic artifacts are defined as electrocardiographic alterations, not related to cardiac electrical activity. As a result of artifacts, the components of the electrocardiogram (ECG) such as the baseline and waves can be distorted. Motion artifacts are due to shaking with rhythmic movement.
What is inferior attenuation?
Inferior wall attenuation was defined as reduced activity in the inferior segments with or without involvement of the inferoseptal and/or inferolateral segments.
What is attenuation correction?
Attenuation correction is a mechanism that removes soft tissue artifacts from SPECT images. Attenuation artifacts vary among patients, but the most common corrections are to artifacts associated with breast attenuation in women and diaphragmatic attenuation in men.
What is a soft tissue artifact?
A “soft tissue artifact” may show up on an image produced by a nuclear stress test. 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 is an artifact on a stress test?
One may also ask, what is an artifact on a stress test? Answer • An artifact, in this context, is anything that can keep the test from being interpreted correctly. People often think of medical tests as definitive — the stress test shows that either you have blockages in the arteries in your heart or you don't — but it usually is not so clear.
What is breast attenuation?
What Is a Breast Attenuation Artifact? A breast attenuation artifact is an abnormality seen on images taken during a cardiac stress test. This artifact is generally a benign finding and is caused by the shadow cast by breast tissue over the cardiac tissue being tested. Attenuation artifact errors are the most common errors seen during cardiac ...
How does photon attenuation affect a person's body?
Photon attenuation can be affected by the tracer injected during the test, which aids in visualization on imaging. Attenuation is also affected by a person's body size, camera position during imaging and the depth at which the heart is located within the thorax. In SPECT imaging, if the breast tissue shadow is superimposed over the heart, ...
What is breast attenuation artifact?
BACKGROUND: Breast attenuation artifact is well known for reducing the accuracy of myocardial perfusion imaging in women. The normals were further divided into those with breast attenuation (defined as mean anterior counts <70% maximum) and those without.
What is attenuation correction in pet?
Attenuation is the loss of detection of true coincidence events because of their absorption in the body or due to their scattering out of the detector field of view.
What is an artifact in medical terms?
1. Anything (especially in a histologic specimen or a graphic record) that is caused by the technique used or is not a natural occurrence but is merely incidental. 2. A skin lesion produced or perpetuated by self-inflicted action , such as scratching in dermatitis artefacta. Synonym (s): artefact.
What is a fixed apical defect?
However, pure apical defects were considered as one abnormal coronary territory but were not assigned to any specific coronary territory. The presence of only one abnormal coronary territory was defined as a reversible or fixed perfusion defect that occurred in one vascular territory.
What is a perfusion defect?
In an abnormal scan an area of the myocardium will turn grey slower than the surrounding tissue as the blood (and hence gadolinium) enters more slowly due to a narrowing of the coronary artery supplying it. This is called a perfusion defect and usually represents myocardial ischaemia.
What is ultrasound artifact?
The mirror image artifact is the presentation of objects that are present on one side of a strong reflector, appearing on the other side as well.
What is an artifact on a stress test?
Answer • An artifact, in this context, is anything that can keep the test from being interpreted correctly. People often think of medical tests as definitive — the stress test shows that either you have blockages in the arteries in your heart or you don't — but it usually is not so clear.
