Transducers Transducer Covers
120 Lumify Ultrasound System
Philips Healthcare 4535 618 58571_A/795 * MAY 2016
Spectral broadening is a display phenomenon that occurs when the number of energy-bearing
Fourier frequency components increases at any given point in time. As a consequence, the
spectral display is broadened. Spectral broadening can indicate the disturbed flow caused by a
lesion, and therefore it is important diagnostically. However, broadening can also result from
interaction between flow and sample volume size, in which case it is an artifact.
Speed of sound artifacts occur if the sound propagation path to a reflector is partially through
bone, and the speed of sound is greater than in the average soft tissue. Echo position
registration artifacts will be produced. Reflectors appear closer to the transducer than their
actual distance because of this greater speed of sound, resulting in a shorter echo transit time
than for paths not containing bone.
Transducer Covers
To prevent contamination by blood-borne pathogens, sterile transducer covers are required for
needle guidance procedures. Philips recommends the use of qualified covers.
For procedures for using transducer covers, see the instructions provided with the covers.
WARNING
Latex and talc are commonly used in sheaths marketed to help with infection control during
biopsies. Examine the packaging to confirm latex and talc content. Studies have shown that
patients can experience allergic reactions with natural rubber latex. See the FDA Medical
Alert, March 29, 1991, reprinted in “FDA Medical Alert on Latex” on page 35.
WARNING
Sterilized transducers should be used with sterile gel and a sterile transducer cover.
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