Geometry of human ribs pertinent to orthopedic chest-wall reconstruction

Mohr, Marcus; Abrams, Eduard; Engel, Christine; Long, William B.; Bottlang, Michael

doi:10.1016/j.jbiomech.2006.05.017

Cited by 109 publications

(81 citation statements)

References 38 publications

(51 reference statements)

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“…The typical range of the height and width of each cross section was found to be 6-8 mm and 11-13 mm respectively, with a through-population standard deviation of approximately 25%. Similar values are provided in Mohr et al [42]. Our ex vivo sheep specimen had typical height and width cross sections in the range of 5-6 mm and 9-11 mm respectively, see Figure 1(C)-(G).…”

Section: Discussionsupporting

confidence: 79%

“…femur, pelvis) potentially concerned by palliative MRgHIFU ablation of bone metastases. Ribs have a particular anatomy with a thin cortical bone, whose thickness is in the order of 1 mm for human ribs [41,42] as well as for our experimental ex vivo set-up. Considering the shear sound speed ¼ 1500 ± 140 m/s and longitudinal sound speed ¼ 2820 ± 40 m/s in cortical bone [44] the respective acoustic wavelengths at 1 MHz are greater than the thickness of the rib cortical bone, possibly involving evanescent waves.…”

Section: Discussionmentioning

confidence: 99%

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Spatio-temporal quantitative thermography of pre-focal interactions between high intensity focused ultrasound and the rib cage

Petrusca

Salomir

Manasseh

et al. 2015

International Journal of Hyperthermia

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Objective: The aim of this paper is to quantitatively investigate the thermal effects generated by the pre-focal interactions of a HIFU beam with a rib cage, in the context of minimally invasive transcostal therapy of liver malignancies. Materials and methods: HIFU sonications were produced by a phased-array MR-compatible transducer on Turkey muscle placed on a sheep thoracic cage specimen. The thoracic wall was positioned in the pre-focal zone 3.5 to 6.5 cm below the focus. Thermal monitoring was simultaneously performed using fluoroptic sensors inserted into the medullar cavity of the ribs and high resolution MR-thermometry (voxel: 1 Â 1 Â 5 mm 3 , four multi-planar slices). Results: MR-thermometry data indicated nearly isotropic distribution of the thermal energy at the ribs' surface. The temperature elevation at the focus was comparable with the pericostal temperature elevation around unprotected ribs, while being systematically inferior, by more than a factor of four on average, to the intra-medullar values. The spatial profiles of the pericostal and intra-medullar thermal build-up measurements could be smoothly connected using a Gaussian function. The dynamics of the post-sonication thermal relaxation as determined by fluoroptic measurements was demonstrated to be theoretically coherent with the experimental observations. Conclusion: The experimental findings motivate further efforts for the transfer towards clinical routine of effective rib-sparing strategies for hepatic HIFU.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Spatio-temporal quantitative thermography of pre-focal interactions between high intensity focused ultrasound and the rib cage

Petrusca

Salomir

Manasseh

et al. 2015

International Journal of Hyperthermia

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“…For this purpose, we manually placed a structure of size 12.4 mm × 7.2 mm, representing a rib cross-section in accordance with [18], close to the skin. We augmented each frame in a US image sequence from the training data with new ultrasound bone shadows by multiplying the input US images with a signal intensity map.…”

Section: Evaluating Tracking Under Shadowingmentioning

confidence: 99%

Robust motion tracking in liver from 2D ultrasound images using supporters

Özkan¹,

Tanner²,

Kastelic³

et al. 2017

Int J CARS

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Purpose: Effectiveness of image-guided radiation therapy with precise dose delivery depends highly on accurate target localization, which may involve motion during treatment due to, e.g., breathing and drift. Therefore, it is important to track the motion and adjust the radiation delivery accordingly. Tracking generally requires reliable target appearance and image features, whereas in ultrasound imaging acoustic shadowing and other artifacts may degrade the visibility of a target, leading to substantial tracking errors. To minimize such errors, we propose a method based on so-called supporters, a computer vision tracking technique. This allows us to leverage information from surrounding motion for improving robustness of motion tracking on 2D ultrasound image sequences of the liver. Methods: Image features, potentially useful for predicting the target positions, are individually tracked and a supporter model capturing the coupling of motion between these features and the target is learned on-line. This model is then applied to predict the target position, when the target cannot be otherwise tracked reliably. Results: The proposed method was evaluated using the Challenge on Liver Ultrasound Tracking (CLUST)-2015 dataset. Leave-one-out cross validation was performed on the training set of 24 2D image sequences of each 1-5 minutes. The method was then applied on the test set (24 2D sequences), where the results were evaluated by the challenge organizers, yielding 1.04 mm mean and 2.26 mm 95%ile tracking error for all targets. We also devised a simulation framework to emulate acoustic shadowing artifacts from the ribs, which showed effective tracking despite the shadows. Conclusions: Results support the feasibility and demonstrate the advantages of using supporters. The proposed method improves its baseline tracker, which uses optic-flow and elliptic vessel models, and yields the state-of-the-art real-time tracking solution for the CLUST challenge.

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“…A shorter end length results in a smaller degree of articulation and improved maneuverability in the thorax, but a minimum length is imposed by the components that must be included. The minimum radius of curvature of the ribs imposes an upper limit on tool end length; from Mohr et al [7] this is approximately 10 cm in adults. From the authors" surgical experience and benchmark relative to endoscopic staplers, 6 cm would result in a maneuverable tool.…”

Section: Device Requirementsmentioning

confidence: 99%

“…The symmetry of the device allows this one direction of articulation to reach a partial hemisphere of screw orientations. From parametric modeling of rib geometry (data from [7]), 60 o will allow full access to multiple anterior fractures through a single posterior incision. The articulation must have a resolution of at least 10 o (the accuracy with which screws must be placed; [8]).…”

Section: Device Requirementsmentioning

confidence: 99%

An Articulating Tool for Endoscopic Screw Delivery

Petrzelka

Menon

Stefanov-Wagner

et al. 2011

Journal of Medical Devices

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This paper describes the development of an articulating endoscopic screw driver that can be used to place screws in osteosynthetic plates during thoracoscopic surgery. The device is small enough to be used with a 12 mm trocar sleeve and transmits sufficient torque to fully secure bone screws. The articulating joint enables correct screw alignment at obtuse angles, up to 60° from the tool axis. A novel articulating joint is presented, wherein a flexible shaft both transmits torque and actuates the joint; antagonist force is provided by a super-elastic spring. Screws are

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Geometry of human ribs pertinent to orthopedic chest-wall reconstruction

Cited by 109 publications

References 38 publications

Spatio-temporal quantitative thermography of pre-focal interactions between high intensity focused ultrasound and the rib cage

Spatio-temporal quantitative thermography of pre-focal interactions between high intensity focused ultrasound and the rib cage

Robust motion tracking in liver from 2D ultrasound images using supporters

An Articulating Tool for Endoscopic Screw Delivery

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