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3D Anatomy

Ivan Wen Wen Lau, Dongting Liu, Lei Xu, Zhanming Fan, Zhonghua Sun
OBJECTIVE: Current diagnostic assessment tools remain suboptimal in demonstrating complex morphology of congenital heart disease (CHD). This limitation has posed several challenges in preoperative planning, communication in medical practice, and medical education. This study aims to investigate the dimensional accuracy and the clinical value of 3D printed model of CHD in the above three areas. METHODS: Using cardiac computed tomography angiography (CCTA) data, a patient-specific 3D model of a 20-month-old boy with double outlet right ventricle was printed in Tango Plus material...
2018: PloS One
Pedro Teixeira Castro, Ana Paula Pinho Matos, Osvaldo Luiz Aranda, Edson Marchiori, Haimon Diniz Lopes Alves, Alessandra Silveira Machado, Ricardo Tadeu Lopes, Heron Werner, Edward Araujo Júnior
OBJECTIVE: The aim of this study was to provide a three-dimensional (3D) microscopic reconstruction of morphological modifications of the fallopian tube (FT) following surgical sterilization (including tuboperitoneal fistula) and ectopic pregnancy (EP) using confocal microtomography (micro-CT). METHODS: Six specimens of FT from elective and emergency surgeries were selected: three remnants of the FT (RFT) from surgical sterilization, including one presenting tuboperitoneal fistula, and three FTs with EP...
March 20, 2018: Journal of Maternal-fetal & Neonatal Medicine
Jamie L Perry, Kazlin Mason, Bradley P Sutton, David P Kuehn
BACKGROUND: Dynamic magnetic resonance imaging (MRI) has been proposed as a non-invasive, child-friendly, reproducible, and repeatable imaging method providing a 3-dimensional view of the velopharyngeal structures and function during speech. However, the value of dynamic MRI as compared to imaging methods such as nasopharyngoscopy is not well understood. The aim of this study was to compare the ability of nasopharyngoscopy and dynamic MRI to accurately identify velopharyngeal closure patterns among adults without cleft palate...
April 2018: Cleft Palate-craniofacial Journal
Shunchang Ma, Pankaj K Agarwalla, Harry R van Loveren, Siviero Agazzi
BACKGROUND AND IMPORTANCE: Persistent trigeminal artery (PTA) is a rare but important anatomic variant that contributes to trigeminal neuralgia (TN). Microvascular decompression (MVD) of the responsible vessel(s) away from the trigeminal nerve provides the most complete and durable relief from TN. The role and technique of MVD for TN associated with a PTA has not been fully defined in the literature. Furthermore, assessment of PTA anatomy intraoperatively with a microscope is challenging...
March 14, 2018: Operative Neurosurgery (Hagerstown, Md.)
Rebecca C Gosling, Paul D Morris, Daniel A Silva Soto, Patricia V Lawford, D Rodney Hose, Julian P Gunn
OBJECTIVES: This study sought to assess the ability of a novel virtual coronary intervention (VCI) tool based on invasive angiography to predict the patient's physiological response to stenting. BACKGROUND: Fractional flow reserve (FFR)-guided percutaneous coronary intervention (PCI) is associated with improved clinical and economic outcomes compared with angiographic guidance alone. Virtual (v)FFR can be calculated based upon a 3-dimensional (3D) reconstruction of the coronary anatomy from the angiogram, using computational fluid dynamics (CFD) modeling...
March 9, 2018: JACC. Cardiovascular Imaging
Xiao Zhou, Mani A Vannan, Zhen Qian
No abstract text is available yet for this article.
May 1, 2018: International Journal of Cardiology
Long Chen, Wen Tang, Nigel W John, Tao Ruan Wan, Jian Jun Zhang
BACKGROUND AND OBJECTIVE: While Minimally Invasive Surgery (MIS) offers considerable benefits to patients, it also imposes big challenges on a surgeon's performance due to well-known issues and restrictions associated with the field of view (FOV), hand-eye misalignment and disorientation, as well as the lack of stereoscopic depth perception in monocular endoscopy. Augmented Reality (AR) technology can help to overcome these limitations by augmenting the real scene with annotations, labels, tumour measurements or even a 3D reconstruction of anatomy structures at the target surgical locations...
May 2018: Computer Methods and Programs in Biomedicine
Wen-Zhao Sun, Dan-Dan Zhang, Ying-Lin Peng, Li Chen, De-Hua Kang, Bin Wang, Xiao-Wu Deng
BACKGROUND: Conventional phantom-based planar dosimetry (2D-PBD) quality assurance (QA) using gamma pass rate (GP (%)) is inadequate to reflect clinically relevant dose error in intensity-modulated radiation therapy (IMRT), owing to a lack of information regarding patient anatomy and volumetric dose distribution. This study aimed to evaluate the dose distribution accuracy of IMRT delivery for nasopharyngeal carcinoma (NPC), which passed the 2D-PBD verification, using a measurement-guided 3D dose reconstruction (3D-MGR) method...
March 15, 2018: Radiation Oncology
Laura J Olivieri, David Zurakowski, Karthik Ramakrishnan, Lillian Su, Fahad A Alfares, Matthew R Irwin, Jenna Heichel, Axel Krieger, Dilip S Nath
BACKGROUND: Postoperative care delivered in the pediatric cardiac intensive care unit (CICU) relies on providers' understanding of patients' congenital heart defects (CHDs) and procedure performed. Novel, bedside use of virtual, three-dimensional (3D) heart models creates access to patients' CHD to improve understanding. This study evaluates the impact of patient-specific virtual 3D heart models on CICU provider attitudes and care delivery. METHODS: Virtual 3D heart models were created from standard preoperative cardiac imaging of ten patients with CHD undergoing repair and displayed on a bedside tablet in the CICU...
March 2018: World Journal for Pediatric & Congenital Heart Surgery
Alberto Zanatta, Luca Bezzi, Nicola Carrara, Cicero Moraes, Gaetano Thiene, Fabio Zampieri
Morgagni is considered the father of pathological anatomy. He died in 1771, 89 years old, and was buried in Saint Maxim church in Padua, where his wife and five of his 15 children were already buried. In 2011, an anthropological analysis confirmed that one of the skulls belonged to the oldest individuals among those found in Morgagni's tomb. A genetic analysis proved a kinship between this skull and the fragments of young individuals (one male and two females), supporting the hypothesis that they were Morgagni and his children...
March 14, 2018: Anthropologischer Anzeiger; Bericht über die Biologisch-anthropologische Literatur
Xiaotian Wu, Joseph A Paydarfar, Ryan J Halter
For a variety of head and neck cancers, specifically those of the oropharynx, larynx, and hypopharynx, minimally invasive trans-oral approaches have been developed to reduce perioperative and long-term morbidity. However, in trans-oral surgical approaches anatomical deformation due to instrumentation, specifically placement of laryngoscopes and retractors, present a significant challenge for surgeons relying on preoperative imaging to resect tumors to negative margins. Quantifying the deformation due to instrumentation is needed in order to develop predictive models of operative deformation...
March 14, 2018: Annals of Biomedical Engineering
Sumit Agrawal, Nadine Schart-Morén, Wei Liu, Hanif M Ladak, Helge Rask-Andersen, Hao Li
OBJECTIVE: We used synchrotron radiation phase contrast imaging (SR-PCI) to study the 3D microanatomy of the basilar membrane (BM) and its attachment to the spiral ligament (SL) (with a conceivable secondary spiral lamina [SSL] or secondary spiral plate) at the round window membrane (RWM) in the human cochlea. The conception of this complex anatomy may be essential for accomplishing structural preservation at cochlear implant surgery. MATERIAL AND METHODS: Sixteen freshly fixed human temporal bones were used to reproduce the BM, SL, primary and secondary osseous spiral laminae (OSL), and RWM using volume-rendering software...
March 2018: Upsala Journal of Medical Sciences
Joseph Tracey, Danny Arora, Christopher E Gross, Selene G Parekh
BACKGROUND: Third generation total talar prostheses (TTPs) are viable options for talar avascular necrosis (AVN) in the absence of neighboring joint pathology. The use of modern three-dimensional (3D) printing allows the production of custom implants that exactly mimic the patient's anatomy. The aim of this study is to determine the accuracy of 3D printing in reproducing a synthetic talus and, in doing so, restoring more normal anatomical relationships. We hypothesize that this mode of replication will restore and maintain normal radiographic alignment of the ankle, subtalar, and forefoot joints in the setting of talar AVN...
March 1, 2018: Foot & Ankle Specialist
Marion Semmler, Michael Döllinger, Rita R Patel, Anke Ziethe, Anne Schützenberger
OBJECTIVE/HYPOTHESIS: Laser-based three-dimensional (3D) imaging allows realistic visualization and absolute measurement of the vocal folds for comprehensive characterization of the oscillation pattern. STUDY DESIGN: Exploratory study with descriptive data analysis in healthy cohort. METHODS: The custom-developed miniaturized measuring device is an endoscopic camera-laser setup for stereo triangulation and suitable for in vivo application...
March 14, 2018: Laryngoscope
Simon Drouin, D Louis Collins
Direct volume rendering has become an essential tool to explore and analyse 3D medical images. Despite several advances in the field, it remains a challenge to produce an image that highlights the anatomy of interest, avoids occlusion of important structures, provides an intuitive perception of shape and depth while retaining sufficient contextual information. Although the computer graphics community has proposed several solutions to address specific visualization problems, the medical imaging community still lacks a general volume rendering implementation that can address a wide variety of visualization use cases while avoiding complexity...
2018: PloS One
Yuji Nakaguchi, Takeshi Oono, Masato Maruyama, Yoshinobu Shimohigashi, Yudai Kai, Yuya Nakamura
In this study, we evaluated the basic performance of the three-dimensional dose verification system COMPASS (IBA Dosimetry). This system is capable of reconstructing 3D dose distributions on the patient anatomy based on the fluence measured using a new transmission detector (Dolphin, IBA Dosimetry) during treatment. The stability of the absolute dose and geometric calibrations of the COMPASS system with the Dolphin detector were investigated for fundamental validation. Furthermore, multileaf collimator (MLC) test patterns and a complicated volumetric modulated arc therapy (VMAT) plan were used to evaluate the accuracy of the reconstructed dose distributions determined by the COMPASS...
March 12, 2018: Radiological Physics and Technology
Hans Peter Dietz, Francesco Scoti, Nishamini Subramaniam, Talia Friedman, Ka Lai Shek
INTRODUCTION AND HYPOTHESIS: Vaginal childbirth clearly has an effect on pelvic floor anatomy, and pregnancy itself also likely plays a role. This study investigated the effects of consecutive pregnancies by comparing pelvic organ support and function in urogynecological patients delivered by cesarean section (CS) only. METHODS: This was a retrospective study using 161 archived data sets of urogynecological patients delivered exclusively by CS presenting with symptoms of pelvic floor dysfunction between 2007 and 2015...
March 12, 2018: International Urogynecology Journal
Takayuki Shijo, Takashi Shirakawa, Masao Yoshitatsu, Keiji Iwata
Stent grafting for complex aortic anatomy remains a challenge. In particular, stent graft collapse (i.e. infolding) is possible when an excessive oversized device is needed. We describe a case of preoperative stent grafting simulation using a three-dimensional (3D) printed model for extensive aortic arch repair in a 69-year-old woman with multiple aneurysms combined with coarctation. The patient was scheduled to undergo staged hybrid repair. A stent graft larger than 28 mm in diameter was needed to deploy into a coarctation of 15 mm in diameter during the 2nd stage of the operation...
March 8, 2018: European Journal of Cardio-thoracic Surgery
Roman I Koning, Abraham J Koster, Thomas H Sharp
Cryo-electron tomography (CET) utilizes a combination of specimen cryo-fixation and multi-angle electron microscopy imaging to produce three-dimensional (3D) volume reconstructions of native-state macromolecular and subcellular biological structures with nanometer-scale resolution. In recent years, cryo-electron microscopy (cryoEM) has experienced a dramatic increase in the attainable resolution of 3D reconstructions, resulting from technical improvements of electron microscopes, improved detector sensitivity, the implementation of phase plates, automated data acquisition schemes, and improved image reconstruction software and hardware...
March 8, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
Isaac V Pratt, James D Johnston, Ernie Walker, David M L Cooper
Cortical bone porosity and specifically the orientation of vascular canals is an area of growing interest in biomedical research and comparative/paleontological anatomy. The potential to explain microstructural adaptation is of great interest. However, the determinants of the development of canal orientation remain unclear. Previous studies of birds have shown higher proportions of circumferential canals (called laminarity) in flight bones than in hindlimb bones, and interpreted this as a sign that circumferential canals are a feature for resistance to the torsional loading created by flight...
March 8, 2018: Journal of Anatomy
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