![]() ![]() Necessary cookies are absolutely essential for the website to function properly. If the breast is in the same position during stress and rest imaging, the apparent perfusion defect will be present on both sets of images. Soft tissue attenuation in the breast is a relatively common source of artifactual decreases in radiotracer activity in the anterior myocardial wall and may affect the depiction of activity in the septal and lateral walls as well, depending on the individual patient’s body habitus. May be an actual lack of bloodflow or not, if it is, it may indicate a prior heart attack. What does diaphragmatic attenuation mean? A term used in forms of radio graphic imaging, it denotes an actual or apparent lack of blood flow of the heart muscle potentially caused by the muscles that control the diaphragm. What is the meaning of ‘diaphragmatic attenuation’? Radionuclide imaging of the thorax results in nonuniform myocardial photon activity due to these intervening structures. The heart is surrounded by tissues of varying densities (eg, bone, lungs, and breast). Soft tissue attenuation is one of the more common causes of rMPI artifact. “The phenomenon is often called diaphragmatic attenuation, which is a misnomer. The inferior wall is furthest away from the detector, photons from the inferior wall thus travel longer distances and are attenuated (thinning, weakening, diluting), giving the appearance of reduced uptake. What is diaphragmatic attenuation artifact? The normal limits of TID ratios were 1.19, 1.23 and 1.46 for static and gated MPS on end-diastolic and end-systolic phase, respectively. 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?Īttenuation correction is a mechanism that removes soft tissue artifacts from SPECT images. What does soft tissue attenuation artifact mean?Īfter 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. Physicians typically learn to recognize some of these artifacts to avoid mistaking them for actual pathology. In medical imaging, artifacts are misrepresentations of tissue structures produced by imaging techniques such as ultrasound, X-ray, CT scan, and magnetic resonance imaging (MRI). Internal electrical artifacts can be caused by tremors, muscle shivering, hiccups or, as in the present case, medical devices. External artifacts are usually caused by line current, which has a frequency of 50 Hz or 60 Hz. What causes artifacts on ECG?Ĭauses of electrical artifacts on ECGs are manifold. When a perfusion defect is identified, its location, size, severity, and reversibility must be reported. Summed stress scores of less than 3 are considered normal, whereas scores of 4–7, 8–12, and 13 or higher are indicative of low, intermediate, and high risk for a hard cardiac event. Superimposition of breast tissue over the heart may result in linear areas of relatively increased activity, which is believed to be caused by small-angle scatter from the breast tissue fold. As a result of artifacts, normal components of the EKG can be distorted.īreast artifacts are the most frequent causes of false positive planar images in female subjects. What is an artifact in your heart?Įlectrocardiograph (EKG) artifacts are defined as EKG abnormalities, which are a measurement of cardiac potentials on the body surface and are not related to electrical activity of the heart. 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. An artifact, in this context, is anything that can keep the test from being interpreted correctly.What does artifact mean on a stress test? 7 What is the meaning of ‘diaphragmatic attenuation’?.4 What is artifact mean in medical terms?.1 What does artifact mean on a stress test?.
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