Evaluation of the reliability and accuracy of femur measurements acquired from computed tomography images

Year 2023, Issue: 46 - Special Issue for the Centenary of the Turkish Republic & The 60th Year of the Journal, 90 - 101, 29.10.2023

Öznur Gülhan

https://doi.org/10.33613/antropolojidergisi.1335356

Abstract

The biological profile holds notable significance within forensic assessments, as it plays a crucial role in determining biological identity. Moreover, it possesses substantial potential for applications in fields such as medical legal cases and forensic anthropology. Recent advancements in technology, specifically in the field of computed tomography, have enabled the accurate acquisition of detailed anatomical data from CT scans present in extensive medical repositories. The validity of new methods developed through the application of these techniques should therefore be analyzed. The primary intent of this research was to investigate the measurement accuracy obtained from CT-generated 3D femur models. To investigate the accuracy and reliability of measurements obtained from CT-generated 3D femur models, 3 different studies were conducted. A dataset comprising fifteen femurs was employed for analysis and measurement purposes. The obtained images were subsequently compared to twelve measurements acquired from the dry femora, enabling an assessment of the reliability and accuracy of both measurement protocols. To investigate the effect of CT parameters and soft tissue, 4 femurs were used. The analysis of twelve femur measurements obtained from the CT images processed with OsiriX software was carried out using Excel software packages and SPSS 24.0. From the results of this study, it can be observed that there is no discernible pattern regarding the reliability of image acquisition in any particular way. This implies that both dry femur bone and 3D virtual femur models can be used interchangeably for the 12 metric measurements used in this study, and at the same time, different scanning parameters or soft tissue influence for these measurements do not make a statistically significant difference.

Keywords

3D imaging, CT parameters, metric measurements, femur, forensic anthropology

Bilgisayarlı tomografi görüntülerinden elde edilen femur ölçümlerinin doğruluk ve güvenilirliğinin değerlendirilmesi

Abstract

Biyolojik profil, biyolojik kimliğin tespitinde kritik bir rol oynadığı için adli değerlendirmelerde önemli bir konuma sahiptir. Mevcut güncel iskelet materyallerinin sınırlı olması nedeniyle, bilimsel araştırmalar çağdaş popülasyonları incelemeye yönelmiştir. Özellikle bilgisayarlı tomografi alanındaki son gelişmeler sayesinde, tıbbi arşivlerde bulunan BT taramalarından detaylı anatomik veriler doğru bir şekilde elde edilebilmektedir. Bu araştırmaların zamanla artan kullanımıyla birlikte, bu tekniklerle geliştirilen yeni yöntemlerin uygulanabilirliğini analiz etmek önemlidir. Bu çalışmanın temel amacı, BT ile oluşturulan 3B femur modellerinden elde edilen metrik ölçümlerin doğruluğunu değerlendirmektir. Bu doğruluk değerlendirmesi için 3 farklı çalışma yapılmıştır. Bu çalışmaların ilki, BT görüntülerinden elde edilen ölçümleri referans olarak kullanılan kuru femur örneklerinden elde edilen ölçümlerle karşılaştırmayı amaçlamaktadır. Ayrıca çalışma, BT parametrelerinin ve yumuşak dokunun femurların üç boyutlu BT görüntülerinden elde edilen 12 ölçümün doğruluğu üzerindeki etkisini incelemeyi hedeflemiştir. Analiz ve ölçüm için on beş femurdan oluşan bir veri seti kullanılmıştır. Elde edilen görüntüler daha sonra kuru femurlardan elde edilen 12 ölçümle karşılaştırılarak her iki ölçüm protokolünün güvenilirliği ve doğruluğu değerlendirilmiştir. CT parametlerinin ve yumuşak dokunun etkisini araştırmak için ise 4 femur kullanılmıştır. OsiriX yazılımı kullanılarak işlenen femur görüntülerinden elde edilen on iki ölçüm, Excel yazılım paketi ve SPSS 24.0 kullanılarak analiz edilmiştir. Bu çalışmanın sonuçlarına göre, BT ile görüntü alımının güvenilirliği açısından belirgin bir standart olmadığı gözlemlenebilir. Sonuçlar hem kuru femur kemiği hem de 3B sanal femur modellerinin bu çalışmada kullanılan 12 metrik ölçüm için birbirlerinin yerine kullanılabileceğini ve aynı zamanda bu ölçümler için farklı tarama parametrelerinin veya yumuşak doku etkisinin istatistiksel olarak anlamlı bir fark yaratmadığını göstermektedir.

Keywords

3B görüntüleme, BT parametreleri, metrik ölçüm, femur, adli antropoloji

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