NewTom VG User Manual rev 4.0 - Image Works

Getting started…
4 Getting started…
This chapter provides a brief introduction for the NewTom VGi system, its power on and off routines and
control devices.
4.1 An introduction to the system
The device NewTom VGi is a panoramic 3D system, dedicated to dento-maxillo-facial area imaging. It
performs the so called "cone-beam" technology.
NewTom VGi is intended for diagnosis of the dento-maxillo-facial complex.
It’s designed for:
imaging of temporo mandibular joints;
imaging of mandibula/jaw for surgical planing;
imaging of nasal/sinus and maxillofacial complex;
A patient is made to lean on the head support and centered by means of 2 laser modules and "scout view"
images.
The scanning system performs a completely rotation around the patient's head. Radiological images are
acquired, that are then automatically processed by the system. The result is the slices set that forms the
reconstructed volume. At the end of this process the axial slices set composes the Volumetric Data. Through
these data it is possible to display coronal and sagittal views of the reconstructed volume in real time.
After defining a Region Of Interest (ROI), from the volumetric data the user can start the creation of a study.
The ROI can be inclined from the volumetric data both to obtain perpendicular images and to correct
positioning errors.
Working on the study data it is possible to create panoramic, transaxial and 3D images. You can also work
on these kinds of images measuring distances, angles, putting comment etc.
Finally new images can be saved inside the study.
The study images can be used to compile a report, that can be then printed and/or saved on a physical
support.
To study in deep these themes please refer to the Software Manual.
4.2 Working principle
According to the cone-beam technology, the source detector system performs a single rotation around the
patient's head, simultaneously acquiring every necessary data for the volumetric reconstruction. Data
acquired each scan step are the digital images corresponding to the radiographic projection. The raw data
set so collected is used in the volumetric tomographic reconstruction process.
This technology brings some advantages:
• direct reconstruction of any set of the scanned object points without passing through axial reconstruction
and data re-formatting;
• total scan time related to the acquisition electronics, rather than to the x-ray tube power and the
mechanics, usually shorter;
• under same conditions of total scan time, less requirements in regards to the source/tube assembly
power and scan mechanics, with constructive and maintenance advantages.
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