Reliably calibrating X-ray images required for preoperative planning of THA using a device-adapted magnification factor
Calibrated pelvic X-ray images are needed in the preoperative planning of total hip arthroplasty (THA) to predict component sizes. Errors and mismatch in the size of one or more components are reported, which can lead to clinically relevant complications. Our aim is to investigate whether we can sol...
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| description | Calibrated pelvic X-ray images are needed in the preoperative planning of total hip arthroplasty (THA) to predict component sizes. Errors and mismatch in the size of one or more components are reported, which can lead to clinically relevant complications. Our aim is to investigate whether we can solve the fundamental problem of X-ray calibration and whether traditional X-ray still has a place in preoperative planning despite improved radiological alternatives.
Based on geometric and radiographic principles, we estimate that the magnification factor is adapted to the X-ray device and depends strongly on the source-image distance of the device. We analyse the errors of the various calibration methods and investigate which narrow range can be expected to show that the center of rotation is sufficiently accurate. Based on the results of several CT-scans we defined an adapted magnification factor and validated the degree of measurement accuracy.
The true magnification of objects on X-ray images depends mainly on the device settings. Stem size prediction is possible to a limited extent, with an error margin of 4.3%. Components can be predicted with a safety margin of one size up and down as with CT or 3D images. The prerequisite is that the source-image distance is greater than or equal to 120 cm, the table-image distance is known, and the object-image distance is estimated according to the patient's BMI. We defined a device-adapted magnification factor that simplifies the templating routine and can be used to obtain the most reliable preoperative dimensional measurements that can be expected from X-ray images. We found the error margin of the magnification factor with the highest degrees of prediction and precision.
Preoperative planning is reliable and reproducible using X-ray images if calibration is performed with the device-adapted magnification factor suggested in this paper. |
| doi_str_mv | 10.1371/journal.pone.0307259 |
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Based on geometric and radiographic principles, we estimate that the magnification factor is adapted to the X-ray device and depends strongly on the source-image distance of the device. We analyse the errors of the various calibration methods and investigate which narrow range can be expected to show that the center of rotation is sufficiently accurate. Based on the results of several CT-scans we defined an adapted magnification factor and validated the degree of measurement accuracy.
The true magnification of objects on X-ray images depends mainly on the device settings. Stem size prediction is possible to a limited extent, with an error margin of 4.3%. Components can be predicted with a safety margin of one size up and down as with CT or 3D images. The prerequisite is that the source-image distance is greater than or equal to 120 cm, the table-image distance is known, and the object-image distance is estimated according to the patient's BMI. We defined a device-adapted magnification factor that simplifies the templating routine and can be used to obtain the most reliable preoperative dimensional measurements that can be expected from X-ray images. We found the error margin of the magnification factor with the highest degrees of prediction and precision.
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Based on geometric and radiographic principles, we estimate that the magnification factor is adapted to the X-ray device and depends strongly on the source-image distance of the device. We analyse the errors of the various calibration methods and investigate which narrow range can be expected to show that the center of rotation is sufficiently accurate. Based on the results of several CT-scans we defined an adapted magnification factor and validated the degree of measurement accuracy.
The true magnification of objects on X-ray images depends mainly on the device settings. Stem size prediction is possible to a limited extent, with an error margin of 4.3%. Components can be predicted with a safety margin of one size up and down as with CT or 3D images. The prerequisite is that the source-image distance is greater than or equal to 120 cm, the table-image distance is known, and the object-image distance is estimated according to the patient's BMI. We defined a device-adapted magnification factor that simplifies the templating routine and can be used to obtain the most reliable preoperative dimensional measurements that can be expected from X-ray images. We found the error margin of the magnification factor with the highest degrees of prediction and precision.
Preoperative planning is reliable and reproducible using X-ray images if calibration is performed with the device-adapted magnification factor suggested in this paper.</description><subject>Arthroplasty, Replacement, Hip - instrumentation</subject><subject>Arthroplasty, Replacement, Hip - methods</subject><subject>Biology and Life Sciences</subject><subject>Biomedical materials</subject><subject>Calibration</subject><subject>Computed tomography</subject><subject>CT imaging</subject><subject>Dimensional measurement</subject><subject>Engineering and Technology</subject><subject>Error analysis</subject><subject>Evaluation</subject><subject>Humans</subject><subject>Medical research</subject><subject>Medicine and Health Sciences</subject><subject>Medicine, Experimental</subject><subject>People and Places</subject><subject>Predictions</subject><subject>Preoperative Care - methods</subject><subject>Radiation</subject><subject>Research and Analysis Methods</subject><subject>Safety margins</subject><subject>Tomography, X-Ray Computed - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Brüggemann, Heinrich</au><au>Paulsen, Aksel</au><au>Oppedal, Ketil</au><au>Grasmair, Markus</au><au>Hömberg, Dietmar</au><au>Williams, John Leicester</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reliably calibrating X-ray images required for preoperative planning of THA using a device-adapted magnification factor</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2024-08-22</date><risdate>2024</risdate><volume>19</volume><issue>8</issue><spage>e0307259</spage><pages>e0307259-</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Calibrated pelvic X-ray images are needed in the preoperative planning of total hip arthroplasty (THA) to predict component sizes. Errors and mismatch in the size of one or more components are reported, which can lead to clinically relevant complications. Our aim is to investigate whether we can solve the fundamental problem of X-ray calibration and whether traditional X-ray still has a place in preoperative planning despite improved radiological alternatives.
Based on geometric and radiographic principles, we estimate that the magnification factor is adapted to the X-ray device and depends strongly on the source-image distance of the device. We analyse the errors of the various calibration methods and investigate which narrow range can be expected to show that the center of rotation is sufficiently accurate. Based on the results of several CT-scans we defined an adapted magnification factor and validated the degree of measurement accuracy.
The true magnification of objects on X-ray images depends mainly on the device settings. Stem size prediction is possible to a limited extent, with an error margin of 4.3%. Components can be predicted with a safety margin of one size up and down as with CT or 3D images. The prerequisite is that the source-image distance is greater than or equal to 120 cm, the table-image distance is known, and the object-image distance is estimated according to the patient's BMI. We defined a device-adapted magnification factor that simplifies the templating routine and can be used to obtain the most reliable preoperative dimensional measurements that can be expected from X-ray images. We found the error margin of the magnification factor with the highest degrees of prediction and precision.
Preoperative planning is reliable and reproducible using X-ray images if calibration is performed with the device-adapted magnification factor suggested in this paper.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>39172955</pmid><doi>10.1371/journal.pone.0307259</doi><tpages>e0307259</tpages><orcidid>https://orcid.org/0000-0002-4953-7883</orcidid><orcidid>https://orcid.org/0000-0003-1292-4983</orcidid><orcidid>https://orcid.org/0000-0002-6116-5584</orcidid><orcidid>https://orcid.org/0000-0001-9460-5729</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Arthroplasty, Replacement, Hip - instrumentation Arthroplasty, Replacement, Hip - methods Biology and Life Sciences Biomedical materials Calibration Computed tomography CT imaging Dimensional measurement Engineering and Technology Error analysis Evaluation Humans Medical research Medicine and Health Sciences Medicine, Experimental People and Places Predictions Preoperative Care - methods Radiation Research and Analysis Methods Safety margins Tomography, X-Ray Computed - methods Total hip arthroplasty X-Rays |
| title | Reliably calibrating X-ray images required for preoperative planning of THA using a device-adapted magnification factor |
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