Anatomical evaluation of CT-MRI combined femoral model

Lee, Yeon S; Seon, Jong Keun; Shin, Vladimir; Kim, Gyu Ha; Jeon, Moongu

doi:10.1186/1475-925x-7-6

Cited by 51 publications

(38 citation statements)

References 26 publications

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“…In spite of these errors, the mean surface difference between CT and MRI was ~0.18 mm, thus reasonably small and would not have adversely affected the outcome of the study. These results were also consistent with those of Lee et al [2008], who investigated the accuracy between CT and MRI-based femoral models (0.5±0.3 mm).…”

Section: Discussionsupporting

confidence: 91%

“…Rathnayaka et al (17) and Lee et al (18) have used 3D bone models reconstructed from CT and MRI images to then quantified their surface differences. They reported that the mean errors between the CT and MRI models were as low as 0.23 and 0.5 mm for the human and ovine femora, respectively (17,18). These results suggested that MRI models can be reconstructed with good accuracy as compared to the CT models.…”

Section: Original Articlementioning

confidence: 98%

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Can MRI accurately detect pilon articular malreduction? A quantitative comparison between CT and 3T MRI bone models

Radzi¹,

Dlaska²,

Cowin³

et al. 2016

Quant. Imaging Med. Surg.

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Background: Pilon fracture reduction is a challenging surgery. Radiographs are commonly used to assess the quality of reduction, but are limited in revealing the remaining bone incongruities. The study aimed to develop a method in quantifying articular malreductions using 3D computed tomography (CT) and magnetic resonance imaging (MRI) models.Methods: CT and MRI data were acquired using three pairs of human cadaveric ankle specimens.Common tibial pilon fractures were simulated by performing osteotomies to the ankle specimens. Five of the created fractures [three AO type-B (43-B1), and two AO type-C (43-C1) fractures] were then reduced and stabilised using titanium implants, then rescanned. All datasets were reconstructed into CT and MRI models, and were analysed in regards to intra-articular steps and gaps, surface deviations, malrotations and maltranslations of the bone fragments.Results: Initial results reveal that type B fracture CT and MRI models differed by ~0.2 (step), ~0.18 (surface deviations), ~0.56° (rotation) and ~0.4 mm (translation). Type C fracture MRI models showed metal artefacts extending to the articular surface, thus unsuitable for analysis. Type C fracture CT models differed from their CT and MRI contralateral models by ~0.15 (surface deviation), ~1.63° (rotation) and ~0.4 mm (translation).Conclusions: Type B fracture MRI models were comparable to CT and may potentially be used for the postoperative assessment of articular reduction on a case-to-case basis.

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Section: Discussionsupporting

confidence: 91%

Section: Original Articlementioning

confidence: 98%

Can MRI accurately detect pilon articular malreduction? A quantitative comparison between CT and 3T MRI bone models

Radzi¹,

Dlaska²,

Cowin³

et al. 2016

Quant. Imaging Med. Surg.

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“…All manual adjustments must be performed by a person capable of verifying the segmentation area to minimise the loss of digital image integrity and to avoid minor discontinuities during segmentation. In order to obtain a 3D model with a high geometric accuracy, the person performing the modelling should be familiar with anatomy in order that errors in bone boundary determination are kept to a minimum (Lee et al 2008;Anastasi et al 2009;Rathnayaka et al 2012). Similar observations were made during segmentation of CT data (Rathnayaka et al 2010;Rathnayaka et al 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The potential of both imaging techniques has been harnessed by introducing multimodal imaging which incorporates MRI and CT data. This approach contributes to accurate 3D reconstruction and visualisation of the examined area, and it overcomes the limitations of both imaging methods (Zarucco et al 2006;Blumenfeld et al 2008;Lee et al 2008;Markelj et al 2012).…”

mentioning

confidence: 99%

Low-field magnetic resonance imaging for 3D volume rendering of canine stifle joint pathologies: a case report

Przeworski¹,

Adamiak²,

Głodek³

2017

Vet. Med. - Czech

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This article presents a case report in which complex deformities of the canine stifle joint were visualised using 3D volume rendering of images acquired in a low-field MRI system. The use of low-field MRI for 3D volume rendering has been described in human medicine, but no such reports are available as yet in veterinary medicine. A two-year-old male mongrel dog (8.5 kg body mass) with an unknown previous history of hindlimb lameness was presented to our clinic. The left stifle joint was hyperextended, slightly enlarged and it showed a limited range of motion. Three-dimensional sequences were used to visualise bones of the stifle joint. Optimal values of in-plane spatial resolution were obtained for small structures. The developed 3D model contributed to our understanding of the spatial localisation of bone deformities in the patient, which was crucial in surgical planning. This report shows that three-dimensional models do significantly enhance the clinical applicability of low-field MRI.

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“…The X-ray photon density that emerges when a narrow bean of monochromatic X-rays with energy E (Joules) and intensity I0 (Joules/sec-cm 2 ), passes through a homogeneous material of density  (g/cm 3 ) and atomic number Z can be expressed as:…”

Section: Mathematical Model Of X-ray Ct Transmissionmentioning

confidence: 99%