IHS Test 1 - Ultrasound

Structures that are [blank_start]anechoic[blank_end] appear black while structures that are [blank_start]hyperechoic[blank_end] appear white.

Put these items in order of what ultrasound travels the fastest to slowest (1 is fastest). [blank_start]1[blank_end]. Bone [blank_start]3[blank_end]. Air [blank_start]2[blank_end]. Liquids

[blank_start]Lower[blank_end] frequencies are needed to image deep structures. [blank_start]High[blank_end] frequencies limit image depth.

[blank_start]Higher[blank_end] frequencies produce better image quality.

Echo brightness is known as [blank_start]gain[blank_end].

Peripheral nerves have a [blank_start]honeycomb[blank_end] pattern.

Label the appearance of vessels with ultrasound.

Arteries are [blank_start]round[blank_end], [blank_start]regular in shape[blank_end], and [blank_start]pulsatile[blank_end].

Veins on an ultrasound are: [blank_start]oval[blank_end], [blank_start]compressible[blank_end], and [blank_start]irregular in shape[blank_end].

Ultrasound appearance: [blank_start]Bone[blank_end] - linear white structure, dark shadow underneath • [blank_start]Fat[blank_end] - dark, unless there is a highly reflective structure such as a tumor • [blank_start]Fascia[blank_end] - highly reflective, appears lighter • Pleura - light with darker cavities • [blank_start]Needle[blank_end] - hyperechoic, appears light, • insertion angle and needle size impact

An ultrasound machine is calibrated to display a returning echo that moves the same wavelength as [blank_start]tissue[blank_end] (1540 m/s). Therefore, artifact will result from returning echoes of bone and gas.

[blank_start]Anisotropy[blank_end] is when a nerve may change in appearance from hypo echoic to hyper echoic as the transducer angle is changed.

[blank_start]Piezoelectricity[blank_end] is the ability of a material to generate an electrical potential following the application of mechanical stress.

Label the following transducer anatomy.

Color doppler is angle-dependent. Red flows [blank_start]toward[blank_end] the transducer and blue flows [blank_start]away[blank_end] from the transducer.

Central venous access is most often performed in the [blank_start]transverse[blank_end] plane.