A patient complains of temporary shading of the vision in one eye.  This symptom is called:

A sonographer switches to a higher frequency transducer.  What effect will that have on aliasing?

With CW Doppler, how many transducer elements are needed at a minimum? 

A long, brightly-echogenic streak is noted in the common femoral vein, which is otherwise patent and compressible.  It moves with probe compression and appears to move with venous flow.  This is most likely:

In one type of Doppler, mean velocity and direction of flow are displayed as a color.  What type of Doppler technique is this?

Most deep venous thrombi become established in the 

A patient presents with bilateral lower extremity edema and nephrotic syndrome.  Thrombus is suspected at which level?

A patient with a  pulmonary embolus might have any of these EXCEPT:

While performing a PPG venous examination on a patient without a tourniquet you obtain an abnormal venous refill time.  In order to determine where the insufficiency is occurring you proceed to apply a tourniquet just above the knee and get a normal venous refill time.  Where is the patient’s insufficiency occurring? 

Venous refilling time by photoplethysmography was 10 seconds without a tourniquet applied and 25 seconds with a tourniquet applied to the lower thigh.  The diagnosis is: