Quiz 9 quick study guide

Quality Assurance Device Categories

(1) Tissue Equivalent Phantom- object that mimics human tissue

(2) Doppler Phantom- mimics blood vessels

(3) Beam Profile/Slice Thickness- helps evaluate 3rd dimension

Multipurpose Tissue Equivalent Phantom

• made of aqueos gel and graphite particles

• stainless steel pins throughout the tissue to record and identify

• has structures that mimic cysts and masses

Slice Thickness Phantom

• evaluates the elevational plane/elevational resolution

• THINNER slice thickness = better spatial resolution

• contains diffuse scattering that is at an angle to the incident of the beam

Doppler Phantom

• uses a physical moving structure such as a vibrating string, moving belt, or a circulation pump to mimic blood flow

• used for:

  • Depth Resolution, Volume Flow, Velocity Accuracy, Doppler Angle

Fetal Phantom

• fetus is at 21 weeks gestational age