Uss Views

Introduction

A standard set of views is taken to assist with consistent visualisation of structures and in the interpretation of possible abnormalities.

The ultrasound takes a "slice" through the structure, resulting in a 2D image of a 3D structure. It is therefore important to understand the relationship of the anatomy to the image provided.

Images are usually taken through the anterior fontanelle. The posterior fontanelle can be used if needed, and axial images are occasionally taken through the temporal bone.

In the coronal plane, a series of images are taken through the frontal lobes, more posteriorly through the ventricles and thalami, then along the plane of the choroid plexus, then superior to that.

The sagittal images are initially taken in the midline, with images then taken on both sides at the level of the lateral ventricles then periventricular areas.

Frontal lobes

The transducer obtains an image through the frontal lobes. The orbital ridge forms the inferior boundary of this image.

Anterior Horns of the Lateral Ventricles

The transducer is angled back. The CSF in the lateral ventricles appears as a dark image. The lateral ventricles are larger in preterm infants than in term infants. Asymmetry between the lateral ventricles is common and is not necessarily abnormal. The cavum septum pallucidum sits between the lateral ventricles and is often large in preterm infants. The corpus callosum appears above the cavum.

The Third Ventricle

With the transducer shifted slightly further back, the third ventricle appears below both lateral ventricles and the septum pallucidum. It is often small and difficult to see, but can vary considerably in size. The foramen of Monro (connecting lateral and 3rd ventricles) may be clearly seen. The brainstem may be seen as a tree-like shape.

Trigone

Angling further back cuts through the trigones of the lateral ventricles. The choroid plexus fills the lateral ventricles in this view and is prominent in...