more accurate measurements. In the context of medi- cal devices, CT scanning is becoming more useful. “Something like a Romer Arm is ideal for measuring engineered joints, where tolerances are actually a little more forgiving,” explained Solberg. “But, there are many instances where the CT scanner is absolutely the only way to go because of its accuracy. A Romer Arm and scanner is capable of holding ±50 microns (0.002”), while our CT Scanner is certifi ed to ±2 mi- crons (0.000078”).” He noted such accuracy certifi ed for metrology is especially critical to the customer. “Only recently have [some] CT scanners been certifi ed by the German VDI/VDE group,” he said, referring to the German standards organization that serves as certi- fying organization for many metrology processes. CT scanning is ideal for many classes of medical parts, those with small and intricate details often hid- den away inside the part. This includes 3D printing, a parts manufacturing technique that seems ideal for making many medical parts, according to Solberg. “It means you can measure that part without having
to cut it open,” he said. Exact Metrology has recently partnered with ProCon X-Ray GmbH, a German de- veloper of X-ray inspection equipment for industrial applications, to sell the ProCon line of CT metrol- ogy devices in the United States. “I think the biggest impact with medical metrology right now is the ongoing development of the CT scanning,” he said. CT scanners like the ProCon allow users to swap out two different power ratings, such as 160 or 225 KV, each with its own advantage. And the smaller desktop models are ideal for smaller medical parts, such as stents or implants, that need critical inside dimensions measured. Recently, Exact Metrology has even entered the direct patient care business in a project to deliver systems that precisely guide radiation treatments ro- botically. Another application of CT scanning some- what directly in patient care is in root canal proce- dures, according to Dr. James Gutmann, DDS and professor emeritus of Texas A&M University (Dallas, TX). He recently described research that exploited
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