URR OB General Info

Transducer frequency is inversely proportional to:

Depth of penetration

Spatial compounding is also called?

Compound imaging

What is reduced when using spatial compounding?

Clutter and speckle

What does tomographic display allow for?

Display of series of parallel slices obtained in the data set

What is maximum rendering used for?

Evaluation of bony structures

What does inversion mode display?

Fluid filled or hypoechoic structures as solid objects

When is the optimal time for 3D facial evaluation?

Between 23-30 weeks

A 3D evaluation of the endometrium is recommended when the thickness is?

Greater than 5mm

Harmonic imaging produces

Images with better lateral and contrast resolution

When evaluating fetal bones for appropriate ossification, it may be necessary to turn off:

Spatial compounding

Adjusting the dynamic range affects the

Contrast resolution

What is the first step on every 3D ultrasound exam?

Optimize the 2D image

Which 3D reconstruction technique is most useful for evaluating hydrocephalus?

Inversion mode

The S/D ratio is typically used to evaluate the:

The umbilical artery

Reverberation is typically seen in the _____ field of view.

Anterior

What describes the appearance of element damage on an image from a curved transducer?

A vertical linear stripe of no reflected data

What are the two types of bioeffects with ultrasound?

Thermal and Mechanical Cavitation

The thermal index value should be kept at or below _____

0.7

Which type of fetal tissue has the highest risk of thermal bioeffects?

Tissue adjacent to bone

What is the dynamic range of an ultrasound system?

The number of shades of grey displayed on the image