Understand 3D Image Quality Factors

What is a Voxel?

If you combine the word “volumetric” and “pixel,” you get the word “voxel”.    A pixel is a two-dimension shape whereas a voxel is a three-dimensional element shaped like a cube.  Typically the smaller the voxel size the more detail is captured in the image.  Voxel determination is often a balance between the size of the area radiating, detail needed and acceptable dose to the patient to achieve the ALARA principle.

What is a voxel diagram

What is a Focal Spot?

The focal spot is the point where the electrons strike the tube’s anodes and result in the x-ray beam being emitted. The size of the focal spot has a direct influence on the resolution of the image.  The smaller the focal spot, the better the image quality. A small focal spot is generally used at relatively lower power settings (KV & MA) resulting in a lower dose to the patient.

What is a focal spot diagram

Rotation – 180° vs. 360°

Note the increased streak artifacts in the half-scan images. Artifacts appeared as streaks radiating from the titanium rods in the phantom due to photon starvation. The streaking is more pronounced in the half-scan 180° images. The half-scan 180° images exhibit an oblong artifact, in contrast to the full 360° images, where the rods appeared as continuous round circles.

Image rotation diagram

Why Navtech’s Team of Dental Imaging Experts Chose The PreXion Explorer

Why Navtech’s Team of Dental Imaging Experts Chose The PreXion Explorer

—Jim DiQuattro, Navtech360


The engineers at PreXion have truly outdone themselves with the Explorer CBCT…It’s 3D perfection! This powerful CBCT system covers all of the bases with a 15×16 single-scan (no stitching) maximum FOV. The Explorer features unrivaled image quality with an industry-first .3mm focal spot and .07 voxel quality. This finally tuned work-of-art provides the patient with ultra low dose exposure by optimized the pulsed irradiation, one-of-a-kind ultra-low mA, and an available tube voltage of 110kV. Combined with its sleek modern look, its live video-guided positioning system, and a 10-year all-parts warranty, and the PreXion Explorer is truly in a league of its own. And wait until you see the price!

Presentation of image quality and Focal PointsUnrivaled Image Quality:

The Explorer combined the industry’s smallest focal spot (.3mm), full 360-degree image acquisition, and a voxel size as small as 70 μm (microns) to deliver the best image quality, and finest detailed CBCT in the industry.

3D Digital Academy: (Image Quality Factors)

Ultra-Low Dose:

Utilizing optimized pulsed irradiation, low mA thanks to its smaller focal spot, and PreXion’s rapid scan technology (2.3s of exposure) you can capture both arches for as low less radiation than a 2D Pan. (~15 mSv.) This allows you to use your new Explorer CBCT, while respectfully following ALARA guidelines, to see what 2D imaging simply can’t?


Superior and Easy Patient Positioning:

Never miss another shot with onboard live video positioning. Easily align the patient’s region of interest, using the patient’s own anatomy means eliminating all the guesswork and corresponding reshoots. 

True 2D Panoramic Images:

Presentation of 2D Panoramic Images

When it comes to 2D pans no 3D image will ever  produce a pseudo pan the same shape quality as a “True” 2D Pan.  PreXion Explorer allows you the best of both worlds…one machine both modalities.

Seal image saying, Industry's Best Warranty10 Year Warranty: 

Yep, a 10-year all-parts warranty (includes sensor) plus 3 years of labor coverage. We obviously have a lot of confidence in our craftsmanship to offer an an-industry-best 10-year warranty. Invest with Navtech & PreXion and you’ll enjoy a decade with total peace of mind.

Our Conclusion

Navtech’s team of experts has either been employed by or worked with all the major manufacturers of 3D CBCT systems dating back to 2001 when the very first CBCT was sold in the United States. Since then, CBCT technology has advanced greatly and it seems that nearly all of the players in dental imaging have introduced their own version of CBCT to the market. There are a lot of good 3D systems on the market and as always we set out to work with those that deliver the very best quality without the crazy markups that come when buying from one of the “Big Box” dental dealers. The challenge is to find an affordable product that delivers superb image quality, provides the lowest possible dose to the patient, is intuitive& easy for your team to use, and comes from a manufacturer that is willing to stand behind your investment with a warranty that exceeds industry standards. We found all that and more in PreXion, both their Excelsior and Explorer CBCT models excel in every category. If you’re looking for a 3d system capable of capturing a large field of view in a single scan that can be used for all facets of dentistry the PreXion Explorer can’t be beaten.