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Facet joints occur in pairs along the length of the. spine. The ones that cause the most problems are the ones in the neck (cervical facet joints) or the. ones in the lower back (lumbar facet joints). A denervation is a procedure that aims to modify the way the pain is transmitted from the facet. joints to the brain.
Reverberation. Reverberation (or reverb) is the persistence of sound in an enclosed space after its generation. It is relatively common artifact that limits the interpretation of the final imaging. This phenomenon is due to continuing repeated echoes between anatomic interfaces which are strong reflectors.hadowing. This very common artifact might be characterized as the âAchilles heelâ of echocardiography and occurs when the transmitted ultrasound beam encounters a medium of significantly different acoustic impedance and as a result is reflected back to the transducer.