scholarly journals Augmented Active Shape Model Search – towards 3D Ultrasound-based Bone Surface Reconstruction

10.29007/3px6 ◽  
2020 ◽  
Author(s):  
Benjamin Hohlmann ◽  
Klaus Radermacher
Keyword(s):  
Physiological Model ◽  
Patient Specific ◽  
Ultrasound Images ◽  
Bone Surface ◽  
Three Dimensional Model ◽  
In Vivo Evaluation ◽  
Active Shape Models ◽  
Patient Specific Instrumentation ◽  
Active Shape

Patient-specific instrumentation in total knee arthroplasty (TKA), among other medical indications, requires a three-dimensional model of the bones involved. Currently, these are typically segmented from computer tomography images. Ultrasound offers a cheap as well as radiation-less imaging alternative, but suffers from a low signal-to-noise ratio as well as several other image artifacts. The interleaved partial active shape models search (IPASM) adapts a general physiological model to a set of images of a single patient, but suffers from false correspondences being soft tissue interfaces that are interpreted as bone surface. In order to counter this problem, a convolutional neural network (CNN) is applied to preprocess ultrasound images into bone confidence maps. This reduces the average surface distance error in an in-vivo evaluation by 0.7 to 1.3 mm.

The precision of patient-specific instrumentation guides for the positioning of the glenoid component in total reverse shoulder arthroplasty: an in vivo scanographic study

2020 ◽  
Vol 44 (9) ◽  
pp. 1761-1766
Author(s):  
Axel Marcoin ◽  
Cécile Nerot ◽  
Thibault Lestra ◽  
Laurent Blasco ◽  
Antoine Ferrier ◽  
...  
Keyword(s):  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Patient Specific ◽  
Glenoid Component ◽  
Patient Specific Instrumentation

An in vivo evaluation of the effects of feed restriction regimens on wooden breast using ultrasound images as a predictive tool

2020 ◽  
pp. 1-7
Author(s):  
C. T. Simões ◽  
S. L. Vieira ◽  
C. Stefanello ◽  
L. Kindlein ◽  
T. Ferreira ◽  
...  
Keyword(s):  
Feed Restriction ◽  
Ultrasound Images ◽  
Predictive Tool ◽  
In Vivo Evaluation ◽  
Wooden Breast

Verification of in vivo accuracy of Trumatch™ patient-specific instrumentation in total knee replacement using pin-less computer navigation

2016 ◽  
Vol 27 (1) ◽  
pp. 125-132 ◽  
Author(s):  
Nikolai Briffa ◽  
Mohamed A. Imam ◽  
Ravi Mallina ◽  
Ashraf Abdelkafy ◽  
Ajeya Adhikari
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Computer Navigation ◽  
Patient Specific ◽  
Patient Specific Instrumentation ◽  
Total Knee

scholarly journals In vivo visualization of pig vagus nerve ‘vagotopy’ using ultrasound

2020 ◽  
Author(s):  
Megan L. Settell ◽  
Maisha Kasole ◽  
Aaron C. Skubal ◽  
Bruce E. Knudsen ◽  
Evan N. Nicolai ◽  
...  
Keyword(s):  
Vagus Nerve ◽  
Motor Nerve ◽  
Nerve Fibers ◽  
Patient Specific ◽  
Neck Muscle ◽  
Therapeutic Effects ◽  
Ultrasound Images ◽  
Anatomical Landmarks ◽  
Novel Approach

AbstractBackgroundPlacement of the clinical vagus nerve stimulating cuff is a standard surgical procedure based on anatomical landmarks, with limited patient specificity in terms of fascicular organization or vagal anatomy. As such, the therapeutic effects are generally limited by unwanted side effects of neck muscle contractions, demonstrated by previous studies to result from stimulation of 1) motor fibers near the cuff in the superior laryngeal and 2) motor fibers within the cuff projecting to the recurrent laryngeal.ObjectiveThe use of patient-specific visualization of vagus nerve fascicular organization could better inform clinical cuff placement and improve clinical outcomes.MethodsThe viability of ultrasound, with the transducer in the surgical pocket, to visualize vagus nerve fascicular organization (i.e. vagotopy) was characterized in a pig model. Ultrasound images were matched to post-mortem histology to confirm the utility of ultrasound in identifying fascicular organization.ResultsHigh-resolution ultrasound accurately depicted the vagotopy of the pig vagus nerve intra-operatively, as confirmed via histology. The stereotypical pseudo-unipolar cell body aggregation at the nodose ganglion was identifiable, and these sensory afferent fascicular bundles were traced down the length of the vagus nerve. Additionally, the superior and recurrent laryngeal nerves were identified via ultrasound.ConclusionsIntraoperative visualization of vagotopy and surrounding nerves using ultrasound is a novel approach to optimize stimulating cuff placement, avoid unwanted activation of motor nerve fibers implicated in off-target effects, and seed patient-specific models of vagal fiber activation to improve patient outcomes.

3D active shape models of human brain structures: application to patient-specific mesh generation

2015 ◽  
Author(s):  
Nishant Ravikumar ◽  
Isaac Castro-Mateos ◽  
Jose M. Pozo ◽  
Alejandro F. Frangi ◽  
Zeike A. Taylor
Keyword(s):  
Human Brain ◽  
Mesh Generation ◽  
Brain Structures ◽  
Patient Specific ◽  
Active Shape Models ◽  
Shape Models ◽  
Active Shape

In-Vivo Alignment Comparing Patient Specific Instrumentation with both Conventional and Computer Assisted Surgery (CAS) Instrumentation in Total Knee Arthroplasty

2014 ◽  
Vol 29 (2) ◽  
pp. 343-347 ◽  
Author(s):  
William Barrett ◽  
Daniel Hoeffel ◽  
David Dalury ◽  
J. Bohannon Mason ◽  
Jeff Murphy ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Computer Assisted Surgery ◽  
Patient Specific ◽  
Computer Assisted ◽  
Patient Specific Instrumentation ◽  
Total Knee

Segmentation of the common carotid artery with active shape models from 3D ultrasound images

2012 ◽  
Author(s):  
Xin Yang ◽  
Jiaoying Jin ◽  
Wanji He ◽  
Ming Yuchi ◽  
Mingyue Ding
Keyword(s):  
Carotid Artery ◽  
Common Carotid Artery ◽  
3D Ultrasound ◽  
Ultrasound Images ◽  
Active Shape Models ◽  
Shape Models ◽  
Active Shape ◽  
The Common

scholarly journals 3D extended field-of-view of the knee joint bones using ultrasound: Application in orthopaedics

10.29007/p1zn ◽  
2019 ◽  
Author(s):  
Maged Nasan ◽  
Yannick Morvan ◽  
Guillaume Dardenne ◽  
Jean Chaoui ◽  
Eric Stindel
Keyword(s):  
Knee Joint ◽  
False Positive Rate ◽  
Field Of View ◽  
Patient Specific ◽  
Ultrasound Images ◽  
Registration Method ◽  
Extended Field ◽  
Extended Field Of View

Patient Specific Instruments (PSIs) have been introduced into the surgical workflow as a modern way to assist the surgeon in performing femur and tibia resection in Total Knee Arthroplasty (TKA). These PSIs are based on an accurate reconstruction of the surface of the knee’s bones.In this work, we propose two 3D-3D image-based registration methods to reconstruct an extended field-of-view of the knee joint using only a motorized ultrasound transducer. Those methods are: (1) a dense voxel-based registration method, which needs to preprocess the ultrasound images and form an ultrasound volume. Then, computing the Mutual Information (MI) for each relative displacement to align every pair of volumes, (2) a sparse point-based registration method, which takes into account the point set located on the surface of the bone in ultrasound images. This method detects bony features using ORB detector and matches the corresponding points to find the best transformation using Coherent Point Drift (CPD).The preliminary qualitative results performed in vitro show that from a set of consecutive ultrasound volumes, an extended field-of-view can be reconstructed using only ultrasound images without any external trackers. Results of the voxel-based approach show that MI is more robust against noise comparing to other similarity measures. On the other hand, results of point-based approach show that is much faster in computation with a low false-positive rate compared to other feature-detectors like SIFT and SURF. Furthermore, experiments show that CPD is less affected by noisy data compared to the classical ICP, which is promising to continue evaluating our work in vivo.

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