Pre‐operative templating for total hip arthroplasty: How does radiographic technique and calibration marker placement affect image magnification?
| العنوان: | Pre‐operative templating for total hip arthroplasty: How does radiographic technique and calibration marker placement affect image magnification? |
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| المؤلفون: | Mia Holliday, Adam L Steward |
| المصدر: | Journal of Medical Radiation Sciences, Vol 68, Iss 3, Pp 228-236 (2021) Journal of Medical Radiation Sciences |
| بيانات النشر: | Wiley, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Greater trochanter, Materials science, total hip arthroplasty, Arthroplasty, Replacement, Hip, Radiography, magnification, R895-920, Magnification, Imaging phantom, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Medical physics. Medical radiology. Nuclear medicine, 0302 clinical medicine, Calibration, Humans, pre‐operative planning, Radiology, Nuclear Medicine and imaging, Digital radiography, scaling marker, Radiological and Ultrasound Technology, business.industry, Detector, Reproducibility of Results, Original Articles, Radiographic Image Enhancement, 030220 oncology & carcinogenesis, Radiographic Image Interpretation, Computer-Assisted, Calipers, Original Article, Hip Joint, business, Nuclear medicine |
| الوصف: | Introduction Pre‐operative templating using digital radiography is an effective method of planning for total hip arthroplasty (THA) and requires a generalised fixed magnification factor (MF) or external calibration markers (ECM). The effect on image magnification when changing source‐to‐image distance (SID), object‐to‐image distance (OID) and different imaging conditions is not well described. This study aims to quantify the range of effects manipulation of radiographic parameters can have on image magnification across different body habitus and imaging conditions. Methods A simple phantom study was performed. A 25 mm ECM was placed at eight different OID values along the anterior–posterior phantom plane at three different SID values and imaging conditions, and X‐rays were obtained. On each radiograph, the ECM was measured using a line calliper tool by three radiographers and recorded. The MF was calculated and recorded. Results The smallest observed image MF was 1.16, for an 8 cm OID, 120 cm SID with the ECM placed within the central ray and the X‐ray detector in bucky underneath the X‐ray table. The largest image MF was 1.40 for a 15 cm OID, 100 cm SID with the X‐ray detector placed underneath an emergency department imaging trolley. Conclusions Digital pre‐operative templating for THA relies on accurate radiographic positioning and is dependent of the patient body habitus, radiographic parameters and imaging conditions selected by the radiographer. The use of appropriately positioned ECMs – placed medially between the patient’s internally rotated legs at the level of the greater trochanter, lowers the potential for magnification inaccuracies. Digital preoperative templating for total hip arthroplasty (THA) relies on accurate radiographic positioning, and is dependent of the patient body habitus, radiographic parameters and imaging conditions selected by the performing radiographer. Based on the findings of this study, we believe that the use of a generalised magnification factor (MF) does not account for deviation of these factors, and hence can be inaccurate. The use of appropriately positioned external calibration markers (ECM) – placed medially between the patient’s internally rotated legs at the level of the greater trochanter, lowers the potential for magnification inaccuracies. |
| اللغة: | English |
| تدمد: | 2051-3895 2051-3909 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bc90ec9dbcec0882a548a4c98b80e3e https://doaj.org/article/529bc20a80d549109060ff3da72fb9b9 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....2bc90ec9dbcec0882a548a4c98b80e3e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20513895 20513909 |
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