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Industrial computed tomography
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<h2 id="types-of-scanners">Types of scanners</h2> <p><i>Line beam scanning</i> is the traditional process of industrial CT scanning.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> X-rays are produced and the beam is <a href="/facts/Collimated_beam/lhd2hhPt">collimated</a> to create a line. The X-ray line beam is then translated across the part and data is collected by the detector. The data is then reconstructed to create a 3-D <a href="/facts/Volume_rendering/cpfXEhYo">volume rendering</a> of the part. </p><p>In <i>cone beam scanning</i>, the part to be scanned is placed on a rotary table.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> As the part rotates, the cone of X-rays produce a large number of 2D images that are collected by the detector. The 2D images are then processed to create a 3D <a href="/facts/Volume_rendering/cpfXEhYo">volume rendering</a> of the external and internal geometries of the part. </p> <h2 id="history">History</h2> <p>Industrial CT scanning technology was introduced in 1972 with the invention of the <a href="/facts/CT_scan/NusPJ2S8">CT scanner</a> for medical imaging by <a href="/facts/Godfrey_Hounsfield/u2BHgbbq">Godfrey Hounsfield</a>. The invention earned him a Nobel Prize in medicine, which he shared with <a href="/facts/Allan_McLeod_Cormack/0SVy7eLY">Allan McLeod Cormack</a>.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> Many advances in CT scanning have allowed for its use in the industrial field for metrology in addition to the visual inspection primarily used in the medical field (medical <a href="/facts/CT_scan/NusPJ2S8">CT scan</a>). </p> <h2 id="analysis-and-inspection-techniques">Analysis and inspection techniques</h2> <p>Various inspection uses and techniques include part-to-CAD comparisons, part-to-part comparisons, assembly and defect analysis, void analysis, wall thickness analysis, and generation of CAD data. The CAD data can be used for <a href="/facts/Reverse_engineering/pmJCV7J7">reverse engineering</a>, geometric dimensioning and tolerance analysis, and production part approval.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p> <h3>Assembly</h3><p> One of the most recognized forms of analysis using CT is for assembly, or visual analysis. CT scanning provides views inside components in their functioning position, without disassembly. Some software programs for industrial CT scanning allow for measurements to be taken from the CT dataset volume rendering. These measurements are useful for determining the clearances between assembled parts or the dimension of an individual feature.</p> <h3>Void, crack and defect detection</h3> <p>Traditionally, determining defects, voids and cracks within an object would require destructive testing. CT scanning can detect internal features and flaws displaying this information in 3D without destroying the part. Industrial CT scanning (3D X-ray) is used to detect flaws inside a part such as porosity,<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> an inclusion, or a crack.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> It has been also used to detect the origin and propagation of damages in concrete.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p><p>Metal casting and moulded plastic components are typically prone to porosity because of cooling processes, transitions between thick and thin walls, and material properties. Void analysis can be used to locate, measure, and analyze voids inside plastic or metal components. </p> <h3>Geometric dimensioning and tolerancing analysis</h3> <p>Traditionally, without destructive testing, full metrology has only been performed on the exterior dimensions of components, such as with a <a href="/facts/Coordinate-measuring_machine/Y0ovwbLf">coordinate-measuring machine</a> (CMM) or with a vision system to map exterior surfaces. Internal inspection methods would require using a 2D X-ray of the component or the use of destructive testing. Industrial CT scanning allows for full non-destructive metrology. With unlimited geometrical complexity, <a href="/facts/3D_printing/lbvWU3t0">3D printing</a> allows for complex internal features to be created with no impact on cost, such features are not accessible using traditional CMM. The first 3D printed artefact that is optimised for characterisation of form using computed tomography CT <a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> </p> <h3>Image-based finite element methods</h3> <p>Image-based finite element method converts the 3D image data from X-ray computed tomography directly into meshes for <a href="/facts/Finite_element_method/eUcfP1vn">finite element analysis</a>. Benefits of this method include modelling complex geometries (e.g. composite materials) or accurately modelling "as manufactured" components at the micro-scale.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> </p> <h2 id="trends-and-developments">Trends and Developments</h2> <p>The industrial computed tomography market is forecast to reach a size of USD 773.45 million to USD 1,116.5 million between 2029 and 2030. Regional trends show that strong market growth is expected, particularly in the Asia-Pacific region, but also in North America and Europe, due to strict safety regulations and preventive maintenance of industrial equipment.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a><a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> Growth is being driven primarily by the ongoing development of CT devices and services that enable precise and non-destructive testing of components. Innovations such as the use of artificial intelligence for automated fault analyses and the development of mobile CT systems are expanding the possibilities.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> </p> <h2 id="developments-for-forensic-science">Developments for Forensic Science</h2> <p>Computed Tomography (CT) has become an increasingly valuable tool in forensic science, particularly in conducting virtual autopsies.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> Unlike traditional autopsies, which require invasive procedures, CT scans allow for non-invasive internal examinations of the body, producing detailed 3D images of bones, organs, and soft tissues.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> This technology is especially useful for detecting fractures, foreign objects (such as bullets or shrapnel), gas embolisms, and signs of trauma that may not be immediately visible externally.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> CT scans can preserve forensic evidence more effectively and are particularly beneficial in cases involving mass disasters, decomposition, or cultural and religious objections to dissection.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> Furthermore, digital imaging from CT can be stored and reviewed multiple times, aiding both legal investigations and educational purposes.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> Overall, CT has enhanced the accuracy, efficiency, and accessibility of post-mortem examinations in forensic contexts. </p> <h3>List of uses of CT scanning in Forensic Science</h3> <p>Sources:<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a><a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a><a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p> <ol><li>Virtual Autopsies (Virtopsies)<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> <ul><li>Non-invasive internal examinations of deceased individuals.</li></ul></li> <li>Detection of Fractures <ul><li>Identification of skull, rib, and other skeletal fractures, especially those not visible externally.</li></ul></li> <li>Visualization of Foreign Objects <ul><li>Location and analysis of bullets, shrapnel, or other embedded materials.</li></ul></li> <li>Assessment of Trauma <ul><li>Differentiation between antemortem (before death) and postmortem (after death) injuries.</li></ul></li> <li>Analysis of Gas Embolisms <ul><li>Identification of air or gas in blood vessels, which may indicate drowning, decompression sickness, or medical malpractice.</li></ul></li> <li>Age Estimation <ul><li>Evaluation of skeletal maturity and dental development in unidentified remains.</li></ul></li> <li>Facial Reconstruction Support <ul><li>High-resolution skull imaging for reconstructing a face digitally.</li></ul></li> <li>Identification of Pathologies <ul><li>Detection of diseases, infections, or chronic conditions that may relate to cause of death.</li></ul></li> <li>Documentation and Archiving <ul><li>Permanent, revisitable digital records of body condition and evidence.</li></ul></li> <li>Comparison with Antemortem Data</li></ol> <ul><li>Matching postmortem CT scans with medical imaging from a person’s lifetime for identification.</li></ul> <ol><li>Explosion and Blast Injury Analysis</li></ol> <ul><li>Assessment of internal damage patterns caused by high-pressure events.</li></ul> <ol><li>Burn Victim Analysis</li></ol> <ul><li>Examining internal structures in severely burned bodies when traditional autopsy is limited.</li></ul> <ol><li>Decomposition Studies</li></ol> <ul><li>Monitoring changes in tissues and gases during the decomposition process.</li></ul> <ol><li>Cultural/Religious Sensitivity</li></ol> <ul><li>Alternative to invasive autopsies when cutting open a body is not permitted.</li></ul> <ol><li>Mass Disaster Victim Identification</li></ol> <ul><li>Efficient imaging of multiple bodies for quick identification and trauma assessment.</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/CT_scan/NusPJ2S8">CT scan</a></li> <li><a href="/facts/Industrial_radiography/q9cEdMFP">Industrial radiography</a></li> <li><a href="/facts/Cone_beam_computed_tomography/MkwdKbfR">Cone beam computed tomography</a>, applications in quality control and <a href="/facts/Metrology/HC0MmLdb">metrology</a>.</li> <li><a href="/facts/PCB_reverse_engineering/uhbdWL2V">PCB reverse engineering</a>, an application of industrial CT to image printed circuit boards non-destructively.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Flisch, A., et al. Industrial Computer Tomography in Reverse Engineering Applications. DGZfP-Proceedings BB 67-CD Paper 8, Computerized Tomography for Industrial Applications and Image Processing in Radiology, March 15–17, 1999, Berlin, Germany. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Woods, Susan (4 June 2010). "3-D CT inspection offers a full view of microparts". MicroManufacturing. Archived from the original on 21 August 2011. Retrieved 27 June 2025. <a href="https://web.archive.org/web/20110821224332/http://micromanufacturing.com/showthread.php?t=876" target="_blank">https://web.archive.org/web/20110821224332/http://micromanufacturing.com/showthread.php?t=876</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"What is industrial CT?". Lumafield. 30 October 2023. Retrieved 27 June 2025. <a href="https://www.lumafield.com/article/what-is-industrial-ct" target="_blank">https://www.lumafield.com/article/what-is-industrial-ct</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Hofmann, J., Flisch, A., Obrist, A., Adaptive CT scanning-mesh based optimisation methods for industrial X-ray computer tomography applications. NDT&E International (37), 2004, pp. 271–278. <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Hofmann, J., Flisch, A., Obrist, A., Adaptive CT scanning-mesh based optimisation methods for industrial X-ray computer tomography applications. NDT&E International (37), 2004, pp. 271–278. <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Zoofan, Brahman. "3D Micro-Tomography - A Powerful Engineering Tool". 3D Scanning Technologies. Archived from the original on 7 July 2011. 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