Main Interface The main interface consists of a centered 3D image surrounded by optional information boxes. By clicking the title of a box you can easily switch between hiding and showing the content.
In the top left corner you find a basic "You are here" diagram of the human body. The part marked with red color represents your current view.
Beneath this map you find a Quick links box which contains links to all the current 3D images and contents.
The Options box allows you to both access this help screen but also to switch between detail levels.
In the Information box you can find a descriptive text of the current 3D image. The colored words in the text correspond to the objects with the same color in the 3D image.
If you just want to look up what all the colored objects represent you can expand the Color key.
EVA uses a format called QuickTime Virtual Reality (QTVR) which makes the objects movable. To move the object you click the image with your left mouse button and thereafter hold and drag on the picture in the direction that you wish to move the object. You can also use your up, down, left and right keys on your keyboard to rotate the object. You can move 360 degrees in horizontal direction and 180 degrees in vertical direction.
You can zoom in and zoom out of a panorama by clicking on the and buttons in the movie window. You can also zoom in and out with the shift and control keys, on your keyboard, respectively.
When you have zoomed in you can pan in the image in two ways. You can either click the pan button after which you click and drag, with your left mouse button, the 3D image, or you can click and hold the CTRL and the ALT key on your keyboard, at the same time, while clicking and dragging the 3D image in the same way.
When you are zoomed out you can find a 3D cube in the upper right corner, with letters on each side, which helps you orient yourself within the picture. You also see letters in each side of the picture. The letters are abbreviations for different views. A anterior, I Inferior, L left, P posterior,
R right, S superior
The principal arteries of supply to the head and neck are the two a. carotis communis. They ascend in the neck and each divides into two branches: the a. carotis externa, supplying the exterior of the head and face, and the greater part of the neck, and the a. carotis interna, supplying to a great extent the parts within the cranial and orbital cavities.
The cerebral arteries are derived from the a. carotis interna and a. vertebralis , which at the base of the brain form a remarkable anastomosis known as the circulus Willisii . It is formed in front by the anterior cerebral arteries, branches of the a. carotis interna, which are connected together by a. communicans anterior; behind by the two a. cerebri posterior, branches of the a. basilaris , which are connected on either side with the a. carotis interna by a. communicans posterior. The parts of the brain included within this arterial circle are lamina terminalis, chiasma opticum, the neurohypophysis, tuber cinereum, corpus mamillare, and substantia perforata posterior.
a. carotis communis (Common carotid)
a. carotis externa (External carotid) a. carotis interna (Internal carotid) a. vertebralis (Vertebral) circulus willisii (Arterial circle of Willis) a. basilaris (Basilar)
The image is created from a CT (Computer Tomography) data set.
The patient seems to have had some kind of neurosurgery which is indicated by the screws and the cut out piece of bone that can be seen on the forehead. In the a. cerebri anterior you can also see a light, high intensity area which probably is a stent.
The right a. carotis externa illustrates the part of a. carotis externa that supplies the neck and jaw area while the left
one illustrates the part that supplies the exterior head and face.
The patient seems to lack a. communicans posterior which makes circulus willisii incomplete. A. carotis externa dexter seems to have a stenosis at its base.