The iNSIde View | North Star Imaging

The iNSIde View

North Star Imaging Blog


Preventive Maintenance of Industrial X-ray System – A Must!

Stephanie Vinger

Service & Technical Training Manger

Industrial X-ray imaging is commonly used as part of design validation and quality control processes across many industrial applications including Aerospace, Automotive, Electronics, Medical, Pharmaceutical, Military and Defense. Similar to medical doctors and specialists checking for cracks and fractures in bones, industrial radiographers and manufacturing engineers use X-ray images to check for cracks and flaws or defects that are not visible to the human eye from the outside of the products being manufactured.  X-ray images are acquired by placing a product/object on a stage between an X-ray tube and X-ray…

Optimizing Defect Detectability

Nate DeRoo

Inspection Services Lab Technician

Setting up a computed tomography scan can be a complicated task when trying to optimize defect detectability. There are many parameters that can be adjusted, and many of them have a direct or inverse relationship with other parameters for your scan. Optimizing these parameters can frequently be a process of trial and error, but if you consider the following you can help reduce some of the time spent optimizing your technique. The first thing to consider is the size of the defects and or features that you would like to image. This will have a very large impact on the technique that you use. Ideally you will…

Industrial Micro-Computed Tomography Uncovering History

Aymeric Beau

Inspection Services Lab Manager

Industrial Micro-Computed Tomography for archaeologists, arts experts, museums and more.  A very powerful and non-destructive technique to examine the inside of an object in 3 dimensions.The increase in capabilities of CT has led to industrial CT scanners being used more often and in more ways than ever before.Within the different worldwide NSI Inspection Service labs, we have seen a tremendous growth of CT scanning requests coming from various industries…

The DICONDE Standard

Mark Aziz

Senior Software Engineer

ASTM1 defines DICONDE as “Digital Imaging and Communication in Nondestructive Evaluation”, and it is a standard for handling, sharing, storing and transmitting information between DICONDE compliant systems. The ASTM DICONDE committee (E07.11) was formed in 1999 to put a NDT standard (DICONDE2) that is based on the medical (DICOM3

Computed Tomography Inspection of Additive Manufactured Components

Pat Carlson

Applications and Training Specialist - Level III

Rapidly expanding into production manufacturing, additive manufacturing (AM) has gained incredible interest in all industry facets. From aerospace applications to simple one off consumer home builds, this technology has immense versatility and use. In additive manufacturing, objects are built by adding layer upon layer of material. With all of these materials in use and knowing that many of these components will be created for critical end use applications in aerospace, medical, or automotive industries to name a few. The challenge becomes; how does the manufacturer inspect these products to ensure safety and…

Taking 3D X-ray Inspection to a New Dimension - 4D CT

Matt Zachman

Inspection Services Lab Technician

You may be wondering what 4D Computed Tomography (CT) is and how does it differ from 3D CT? With 3D CT you will generate a 3D volume of your sample that you are able to rotate, slice through it and adjust your histogram. 4D CT will give you the same benefits as 3D CT, but with the added bonus of motion and time. Sample motion can be captured by either two different scanning techniques, static or dynamic.Static 4D CTStatic 4D CT is the method of creating 4D CT by acquiring multiple CT scans. This is a lot like stop motion animation where a scene is captured and then slight movements…

Did you try binning it?

Nate DeRoo

Inspection Services Lab Technician

What is pixel binning? Pixel binning is a mode that the X-ray detector can run in that takes a 2x2 matrix of pixels and combines them to create one larger pixel. This is done in the hardware internally in the detector so there is no additional processing time for the computer. There are a number of benefits to using pixel binning including better signal level, higher contrast, and faster framerates. The down side to using pixel binning is that there is a loss in image resolution. This decrease in resolution may not have much of a negative effect though, as the contrast sensitivity that…

A New Development for Significantly Reducing Ring Artifact in CT Scans

Brett Muehlhauser

R&D Technical Fellow - ASNT Level III

When performing Computed Tomography, a common artifact that frequently pops its ugly head is a ring artifact. A new Hardware/Software solution from NSI nearly eliminates ring artifacts completely while bringing other benefits to the acquisition process.During a CT scan, pixels that do not respond to the variations in product related attenuation will cause consistent or intermittent tracks along scan trajectories which end up as rings in a CT reconstruction.Another contributor to this artifact is product position. The area of a part that lands directly on the center of the rotational axis has no real…

Advantages of Using Advanced Scanning Styles (Vortex, Subpix, and Mosaix)

Anthony Talberg

Technical Trainer

Standard cone beam scanning is sufficient for many applications, but what about the applications where you cannot fit the part in a single detectors view? Physical size of a sample can be a limitation when trying to achieve a given resolution, or you may be dealing with artifact issues. All of these limitations are the reason that NSI has developed advanced scanning styles to overcome issues you may run into when a challenging application comes in.Vortex scanning is a commonly used scanning style by our NSI experts when a sample is very tall in one direction, such as a baseball bat. When looking for measurement…

Measurement Traceability

Joe Schlecht, PhD

Senior Software Engineer

According to the International Vocabulary of Basic and General Terms in Metrology (VIM) [1], the traceability of a measurement result is demonstrated through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty. This means that not only is it necessary to use a reference standard of length which has an unbroken chain of calibrations, but the uncertainty of the resulting measurements must include the uncertainty of all the links in the calibration chain.While the VIM definition is clear about what is needed for the traceability of a measurement result, it does not…