Evaluation of the geometric accuracy of computed tomography and microcomputed tomography of the articular surface of the distal portion of the radius of cats

Abstract

T he 3-D geometry of bones and joints can be determined from MRI or CT images, and MRI-based 3-D models of articular surfaces have been reported. 1,2 Geometric accuracy of CT images have been described in several studies, including studies that focused on cortical thickness 3 and geometry of the articular surface. 4-7 Accuracy of CT, cone-beam CT, and micro-CT is influenced by several factors, including beam orientation relative to the scan surface and slice thickness. 3 An increase in the popularity of additive manufacturing has led to the common use of CT data to create 3-D or physical models. Accuracy of additive manufacturing models produced from CT-derived 3-D models has been evaluated with a focus on CT scan variables and CT scan segmentation variables. 8,9 Imaging with CT has been used to assess the shape and relative position of bones, 10 estimate joint loads, 11-13 conduct computational modeling of articular contact, 14,15 assess pathological changes in joints, 16,17 and plan surgical procedures. 18 Evaluation of the geometric accuracy of computed tomography and microcomputed tomography of the articular surface of the distal portion of the radius of cats

Geometric accuracy of an acrylonitrile butadiene styrene canine tibia model fabricated using fused deposition modelling and the effects of hydrogen peroxide gas plasma sterilisation

“…One study reported that the articular surface derived from CT images in small bones (e.g. feline radius) had dimensional errors and lacked precision when used to plan limb corrective osteotomy [32]. However, CT imaging can still be used to accurately evaluate and represent musculoskeletal anatomy [33][34][35][36] because the average deviation of CT-based human femur models from a bone-surface scan is negligible and clinically acceptable [23].…”

Evaluation of computer-aided design software methods for assessment of the three-dimensional geometry of the canine radius

“…Development of the local coordinate systems involved the construction of lines or planes on the basis of anatomic features in a process described as the creation of user-defined landmarks, which is common for measurement of bones with CADS. 12,13,24,34 The repeatability and reliability of these methods were evaluated in control and abnormal radii.…”

“…Because the CADS methods used in the present study were applied to CT images, the results were dependent on the accuracy of the CT sequences. Results of a study 34 conducted to assess the accuracy of CT sequencing of the distal portion of the radius of cats indicate that deviations from articular surfaces are approximately half the width of reconstructed CT slices. If it is assumed that a similar error was present in the CT scans used in the present study, the angular inaccuracy of a CADS-based rendering of a 20-mm-wide radius acquired with a CT slice thickness of 1 mm would be within ± 1.4° at each end of the bone.…”

Shape accuracy of an acrylonitrile butadiene styrene canine tibia model fabricated using fused deposition modelling and the effects of hydrogen peroxide gas plasma sterilisation

“…One study reported that the articular surface derived from CT images in small bones (e.g. feline radius) had dimensional errors and lacked precision when used to plan limb corrective osteotomy [28]. However, CT imaging can still be used to accurately evaluate and represent musculoskeletal anatomy [29][30][31][32] because the average deviation of CT-based human femur models from a bone-surface scan is negligible and clinically acceptable [22].…”