Comparative dose levels between CT-scanner and slot-scanning device (EOS system) in pregnant women pelvimetry

Abdennebi, A. Ben; Aubry, S.; Ounalli, L.; Fayache, M. S.; Delabrousse, Éric; Petegnief, Yolande

doi:10.1016/j.ejmp.2016.12.008

Cited by 15 publications

(6 citation statements)

References 24 publications

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“…An obvious advantage of the low-dose bi-planar radiographs is that it accommodates the patient’s whole body, which enables the patient to pose differently in weight-bearing positions, including standing, sitting, squatting, and standing on one leg. Moreover, the reduced radiation dose is an additional critical advantage, which is 2.5 times lower than the plain X-ray and 4–8 times lower than that of the CT scanner [ 28 , 40 , 41 ]. In addition, it is also difficult for some patients to lie down on the CT examination bed, such as patients with degenerative joint disease and patients with hunchback, making the low-dose bi-planar radiographs a more convenient method for them [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

Assessing component orientation of total hip arthroplasty using the low-dose bi-planar radiographs

Tang

Zhou

et al. 2022

BMC Musculoskelet Disord

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Background Three-dimensional computed tomography (3D CT) reconstruction is the reference standard for measuring component orientation. However, functional cup orientation in standing position is preferable compared with supine position. The low-dose bi-planar radiographs can be used to analyze standing cup component orientation. We aimed to assess the validity and reliability of the component orientation using the low-dose bi-planar radiographs compared with the 3D CT reconstruction, and explore the differences between the functional cup orientation in standing radiographs and supine CT scans. Methods A retrospective study, including 44 patients (50 hips) with total hip arthroplasty (THA), was conducted. CT scans were taken 1 week after surgery and the low-dose bi-planar radiographs were taken in the follow-up 6 weeks later. Component orientation measurement was performed using the anterior pelvic plane and the radiographic coronal plane as reference, respectively. Results The study showed no significant difference in cup anteversion (p = 0.160), cup inclination (p = 0.486), and stem anteversion (p = 0.219) measured by the low-dose bi-planar radiographs and 3D reconstruction. The differences calculated by the Bland–Altman analysis ranged from − 0.4° to 0.6° for the three measured angles. However, the mean absolute error was 4.76 ± 1.07° for functional anteversion (p = 0.035) and 4.02 ± 1.08° for functional inclination (p = 0.030) measured by the bi-planar radiographs and supine CT scans. Conclusions The low-dose bi-planar radiographs are the same reliable and accurate as 3D CT reconstruction to assess post-THA patients’ component orientation, while providing more valuable functional component orientation than supine CT scans.

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Section: Discussionmentioning

confidence: 99%

Assessing component orientation of total hip arthroplasty using the low-dose bi-planar radiographs

Tang

Zhou

et al. 2022

BMC Musculoskelet Disord

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“…The EOS scanner used in this study is a low dose system reducing radiation expose 4 to 8 times compared to a CT scan (Ben Abdennebi et al, 2017) and 2.5 times compared to plain x-rays (Chiron et al, 2017). However, if multiple laxity measurements are conducted the total radiation exposure may become problematic.…”

Section: Limitationsmentioning

confidence: 99%

A novel non-invasive method for measuring knee joint laxity in four dof: In vitro proof-of-concept and validation

Pedersen

Vanheule

Wirix-Speetjens

et al. 2019

Journal of Biomechanics

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Knee joint laxity or instability is a common problem that may have detrimental consequences for patients. Unfortunately, assessment of knee joint laxity is limited by current methodologies resulting in suboptimal diagnostics and treatment. This paper presents a novel method for accurately measuring non-invasive knee joint laxity in four degrees-of-freedom (DOF). An arthrometer, combining a parallel manipulator and a six-axis force/moment sensor, average mean difference for translations of 0.08 mm and an average limit of agreement between-1.64 mm and 1.80 mm. The average mean difference for rotations was 0.10°and the limit of agreement were between-0.85° and 1.05°. The presented method eliminates several limitations present in current methods and may prove a valuable tool for assessing knee joint laxity. Current stress radiography is also only assessing single plane laxity, but is not limited by low reliability (Schulz et al., 2005) or STA (Garavaglia et al., 2007). The radiation exposure from such measurements may, however, induce serious health risks for both the patient and operator making the method unsuitable for many applications (Balonov and Shrimpton, 2012). Joint instability must be assessed in multiple DOF in order to fully understand the complexity of the joint structures and the interplay between ligaments (Hirschmann and Müller, 2015). Neither clinical tests, arthrometry nor 1D stress radiography possesses the potential to obtain this information. Furthermore, these methods potentially over-constrain the joint during measurements, by restricting out-of-plane motion, making it appear more stable and potentially shift the load distribution unnaturally in the joint (Woo et al., 1999). Methods capable of measuring unconstrained knee joint laxity in multiple DOF not restricted by the above limitations are a prerequisite to progress the field of research in knee instability and advance current clinical assessment of joint instability. Novel methods utilizing robotics for assessing knee joint laxity has, therefore, recently emerged (Branch et al., 2015; Lorenz et al., 2015). These methods exercise high repeatability and accuracy in the application of forces, however, they are still limited by their inability to measure true bone motion due to STA. By combining robotic technology with new medical image modalities, the aforementioned limitation can be overcome which may make it possible to conceive a laxity measurement method with high accuracy, multiplanar assessment and unaffected by STA. Therefore, this paper proposes such a novel method for measuring knee joint laxity in multiple DOF, combining parallel manipulator technology and low dose biplanar x-ray acquisition. Methods Development An in vivo arthrometer was custom developed, combining a parallel manipulator (H-820, Physik Instrumente, Germany) and a six axis force/moment (F/M) sensor (Omega85 SI-1900-80, ATI Industrial Automation, USA) (see Fig. 1). The parallel manipulator has a manufacturer reported repeatability of ±1 µm and the F/M sensor has a re...

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“…To transfer the method to non-implanted knee, the alternative is to obtain the 3D model with the CTscan, which increases the overall radiation dose of the protocol. By comparison, based on recent studies, the radiation doses of digital radiography and CT scanner are respectively 20 times [39] and 74% [40] higher than biplanar radiography with EOS system. Therefore, stereoradiography with low dose radiation system [41] represents a valuable alternative when considering in vivo kinematics evaluation.…”

Section: In Vitro Accuracymentioning

confidence: 99%

3D Sequential Kinematics of the Femoro-Tibial Joint of Normal Knee from Multiple Bi-planar X-rays: Accuracy and Repeatability

Langlois

Pillet

Lavaste

et al. 2018

IRBM

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Highlights• The EOS system allows the sequential kinematic analysis of the femoro-tibial joint. • The reliability of the registration of 3D model on 2D views has been quantified. • The accuracy of the registration is inferior to 1.6 mm and 0.4 • . • The repeatability of the registration is 0.3 • , 2.1 • and 1.6 • , for the rotations. • The repeatability of the registration is inferior to 1.8 mm for the translations. Graphical abstract AbstractBackground: Several methods can be used to assess joint kinematics going from optoelectronic motion analysis to biplanar fluoroscopy. The aim of the present work was to evaluate the reliability of the use of biplane radiography to quantify the sequential 3D kinematics of the femoro-tibial joint.Methods: Bi-planar X-rays (EOS imaging) of 12 lower limbs (6 specimens in vitro and 6 subjects in vivo) were taken for various knee flexion angles. 3D personalized models of the femur and the tibia were registered on each pair of views. To quantify the bias, the kinematic parameters calculated from the registered models were compared to those obtained from the tripods embedded in the specimens. Intra and inter-operator repeatability of each parameter were assessed from the registrations made by 3 operators in vivo.Results: In vitro, the bias of the tibia pose estimation obtained from the registration method was inferior to 1.6 mm and 0.4 • . In vivo, the repeatability of the sequential kinematic parameters was inferior to 0.3 • , 2.1 • and 1.8 • , for respectively flexion, varus-valgus and medial-lateral rotation and inferior to 1.8 mm for translations.Conclusion: Compared to simple fluoroscopy, the accuracy of our method based on sequential images was of the same order of magnitude, with better results for the translation in the frontal plane. The low dose of radiation of the EOS system offers promising prospects for a clinical use of this method to assess the femoro-tibial sequential kinematics.

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Comparative dose levels between CT-scanner and slot-scanning device (EOS system) in pregnant women pelvimetry

Cited by 15 publications

References 24 publications

Assessing component orientation of total hip arthroplasty using the low-dose bi-planar radiographs

Assessing component orientation of total hip arthroplasty using the low-dose bi-planar radiographs

A novel non-invasive method for measuring knee joint laxity in four dof: In vitro proof-of-concept and validation

3D Sequential Kinematics of the Femoro-Tibial Joint of Normal Knee from Multiple Bi-planar X-rays: Accuracy and Repeatability

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