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QM Registry Ch. 14
Ultrasound Equipment Quality Assurance
Question | Answer |
---|---|
axial resolution | minimum reflector spacing along axis of ultrasound beam that results in separate, distinguishable echoes on display |
depth of visualization | depth into pt or phantom at which signals from scattered echoes can create an image; AKA vertical distance measurement |
horizontal distance measurement | QC test for US equipment requiring measurements taken perpendicular to sound beam axis |
lateral resolution | measure of how close two reflectors can be to one another perpendicular to beam axis and still be distinguished as separate |
scan image uniformity | uniformity in brightness of image created with homogeneous phantom |
slice thickness | thickness of image section |
string test | QC test to evaluate velocity measurement accuracy of Doppler devices; also may be used to evaluate lateral and axial resolution in Doppler mode and to determine accuracy of gate registration on duplex Doppler systems |