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https://www.readbyqxmd.com/read/28437349/a-new-navigational-tool-for-pedicle-screw-placement-in-patients-with-severe-scoliosis-a-pilot-study-to-prove-feasibility-accuracy-and-identify-operative-challenges
#1
Michael Putzier, Patrick Strube, Riccardo Cecchinato, Claudio Lamartina, Eike K Hoff
STUDY DESIGN: Pilot study. OBJECTIVE: To develop and validate the feasibility and accuracy of a newly designed navigational spinal instrument guiding tool for patient-matched thoracic and lumbar pedicle screw placement in patients with severe scoliosis, and to identify intraoperative challenges that may be relevant. SUMMARY OF BACKGROUND DATA: Pedicle screw placement is challenging in severely rotated scoliotic spine with small diameters and asymmetrical shape of the pedicles and vertebrae...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28431730/a-new-device-of-needlescopic-thoracic-sympathectomy-through-a-skin-incision
#2
Hidehiro Yamamoto, Masayoshi Okada
We describe a new technique of performing sympathectomy with a new device. A single skin incision 3 mm long was made in the armpit. The device enables complete resection of the sympathetic segment through a single skin incision, whereas sympathectomy is limited by the use of the conventional needle technique. Even if sympathetic nerves and blood vessels were overlapping, separation of the two organs was performed safely. This device increases the possibility of planning surgical procedures for patients with difficult anatomies...
May 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28428970/changes-in-anterior-segment-parameters-following-pars-plana-vitrectomy-measured-by-ultrasound-biomicroscopy-ubm
#3
Zahra Ghomi, Fariba Ghassemi
Despite being a posterior segment ocular surgery, pars plana vitrectomy (PPV) may also affect anterior segment parameters. We aimed to investigate anterior segment alterations following PPV using ultrasound biomicroscopy (UBM) to visualize the structural anatomy of the eye. In this study, we enrolled phakic patients undergoing PPV (as the sole procedure). The anterior chamber depth, crystalline lens anterior-posterior (AP) diameter, anterior chamber angle, ciliary body dimensions, and integrity of the ciliary zonules and posterior capsule were assessed using UBM before and at least 3 months after PPV...
2017: Medical Hypothesis, Discovery and Innovation in Ophthalmology
https://www.readbyqxmd.com/read/28428052/opening-eyes-to-nanomedicine-where-we-are-challenges-and-expectations-on-nanotherapy-for-diabetic-retinopathy
#4
REVIEW
Elisa J Campos, António Campos, João Martins, António Francisco Ambrósio
People affected with ocular diseases will significantly increase over the next decades, and, consequently, a substantial increase in health costs is expected. Diabetic retinopathy is the most common chronic complication of diabetes. The treatment of eye diseases affecting the posterior segment, such as diabetic retinopathy, is quite challenging due to the anatomy, physiology and biochemistry of the eye. Therefore, the development of new therapeutics for posterior eye diseases has been a major focus of pharmaceutical research in the area of vision sciences...
April 17, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28428014/concussion-induces-focal-and-widespread-neuromorphological-changes
#5
Dafna Sussman, Leodante da Costa, Mallar M Chakravarty, Elizabeth W Pang, Margot J Taylor, Benjamin T Dunkley
Concussion induces transient, and oftentimes chronic, lingering impairment to mental functioning, which must be driven by some underlying neurobiological perturbation - however, the physical changes related to sequelae are difficult to detect. Previous imaging studies on concussion have focused on alterations to cortical anatomy, but few have examined the cerebrum, subcortex, and cerebellum. Here, we present an analysis of these structures in a single cohort (all males, 21 patients, 22 controls) using MRI and diagnosed with a single-concussive episode in the acute and sub-acute stages of injury...
April 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28425458/anatomy-of-terminal-moraine-segments-and-implied-lake-stability-on-ngozumpa-glacier-nepal-from-electrical-resistivity-tomography-ert
#6
Sarah S Thompson, Bernd Kulessa, Douglas I Benn, Jordan R Mertes
Moraine-dammed lakes at debris-covered glaciers are becoming increasingly common and pose significant outburst flood hazards if the dam is breached. While moraine subsurface structure and internal processes are likely to influence dam stability, only few sites have so far been investigated. We conducted electrical resistivity tomography (ERT) surveys at two sites on the terminal moraine complex of the Ngozumpa Glacier, Nepal, to aid assessment of future terminus stability. The resistivity signature of glacier ice at the site (100-15 kΩ m) is more consistent with values measured from cold glacier ice and while this may be feasible, uncertainties in the data inversion introduce ambiguity to this thermal interpretation...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28416159/new-finite-element-study-protocol-clinical-simulation-of-orthodontic-tooth-movement
#7
Antoine Bouton, Yohann Simon, Florent Goussard, Luciano Teresi, Vittorio Sansalone
The aim of this work was to model tooth movement in a more clinically-exact fashion, thanks to the use of new IT tools and imaging systems (cone-beam). Image segmentation and 3D reconstruction now enable us to model the anatomy realistically, while finite element (FE) analysis makes it possible to evaluate stresses and their distribution on the level of the tooth, the periodontal ligament (PDL) and the alveolar bone when a force is applied. The principle is to monitor tooth movement by obtaining optical impressions at each stage of treatment...
April 13, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28413808/vessel-tree-tracking-in-angiographic-sequences
#8
Dong Zhang, Shanhui Sun, Ziyan Wu, Bor-Jeng Chen, Terrence Chen
We present a method to track vessels in angiography [contrast filled vessels in two-dimensional (2-D) x-ray fluoroscopy]. Finding correspondence of a vessel tree from consecutive angiogram frames provides significant value in computer-aided clinical applications such as fast vessel tree segmentation, three-dimensional (3-D) vessel topology reconstruction from corresponding centerlines, cardiac motion understanding, etc. However, establishing an accurate vessel tree correspondence (vessel tree tracking) is a nontrivial problem due to nonlinear periodic cardiac and breathing motion in 2-D views, foreshortening, false bifurcations due to 3-D to 2-D projection, occlusion from other anatomies, etc...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28408698/reproducibility-of-lobar-perfusion-and-ventilation-quantification-using-a-spect-ct-segmentation-software-in-lung-cancer-patients
#9
Karine Provost, Antoine Leblond, Annie Gauthier Lemire, Edith Fillion, Houda Bahig, Martin Lord
Planar perfusion scintigraphy with Tc99m-labelled macroaggregated albumin (Tc99m-MAA) is often used for pre-therapy quantification of regional lung perfusion in lung cancer patients, particularly in patients with poor respiratory function. However, subdividing lung parenchyma in rectangular regions of interests, as done on planar images, is a poor reflection of true lobar anatomy. New tridimensional methods using SPECT and SPECT/CT have been introduced, including a semi-automatic lung segmentation software (Hermes Medical Solutions)...
April 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28408248/extraforaminal-compression-of-the-l5-nerve-an-anatomical-study-with-application-to-failed-posterior-decompressive-procedures
#10
R Shane Tubbs, Joe Iwanaga, Islam Aly, Marc D Moisi, David R Hanscom, Jens R Chapman, Marios Loukas, Rod J Oskouian
This anatomical study was performed to elucidate the pertinent foraminal and lateral L5 nerve anatomy to enhance our understanding of possible neurologic causes of failed decompression surgery. Persistent extraforaminal L5 nerve compression is a possible cause of persistent symptoms following lumbosacral surgery. The amount of extraforaminal space for the L5 ventral ramus was examined in fifty adult human skeletons (100 sides). Based on morphology, the specimens were then categorized (types I-IV) on the basis of the bony space available for the nerve at this location...
April 10, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28405900/evaluation-of-pre-surgical-models-for-uterine-surgery-by-use-of-three-dimensional-printing-and-mold-casting
#11
Sayed Ahmad Zikri Bin Sayed Aluwee, Xiangrong Zhou, Hiroki Kato, Hiroshi Makino, Chisako Muramatsu, Takeshi Hara, Masayuki Matsuo, Hiroshi Fujita
We propose an approach to supporting pre-surgical planning for the uterus by integrating medical image analysis and physical model generation based on 3D printing. With our method, we first segment the patient-specific anatomy and lesions of the uterus on MR images; then, we create a 3D physical model, an exact replica of the patient's uterus in terms of size and softness, with transparency for easy observation of the internal structures of the uterus. In our experiments, we created pre-surgical models of hysterectomy for five patients who had been diagnosed to have uterine endometrial cancer...
April 12, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28401229/microengineered-biomimetic-ocular-models-for-ophthalmological-drug-development
#12
REVIEW
Zachary Estlack, Devasier Bennet, Ted Reid, Jungkyu Kim
Current ophthalmological drug discovery and testing methods have limitations and concerns regarding reliability, ethicality, and applicability. These drawbacks can be mitigated by developing biomimetic eye models through mathematical and experimental methods which are often referred to as "eye-on-a-chip" or "eye chip". These eye chip technologies emulate ocular physiology, anatomy, and microenvironmental conditions. Such models enable understanding of the fundamental biology, pharmacology, and toxicology mechanisms by investigating the pharmacokinetics and pharmacodynamics of various candidate drugs under ocular anatomical and physiological conditions without animal models...
April 12, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28398710/additional-values-of-high-resolution-gadoxetic-acid-enhanced-mr-cholangiography-for-evaluating-the-biliary-anatomy-of-living-liver-donors-comparison-with-t2-weighted-mr-cholangiography-and-conventional-gadoxetic-acid-enhanced-mr-cholangiography
#13
Hyo-Jin Kang, Jeong Min Lee, Jeong Hee Yoon, Ijin Joo, Won Chang, Kyung-Suk Suh, Kwang-Woong Lee, Nam-Joon Yi, Joon Koo Han
PURPOSE: To determine the incremental value of small field of view (sFOV) high-resolution (HR) gadoxetic acid-enhanced 3D T1 -weighted (W) magnetic resonance cholangiography (MRC) for evaluating the biliary anatomy of potential living donors by comparing it to T2 W-MRC. MATERIALS AND METHODS: In all, 73 living donor candidates underwent gadoxetic acid-enhanced MRI (3.0T) including three kinds of MRCs: 3D multislice T2 W-MRC, regular FOV (rFOV) (380 × 380mm, resolution 1...
April 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28396968/a-comprehensive-review-of-the-anterior-fontanelle-embryology-anatomy-and-clinical-considerations
#14
REVIEW
Anthony V D'Antoni, Orin Imani Donaldson, Cameron Schmidt, Veronica Macchi, Raffaele De Caro, Rod J Oskouian, Marios Loukas, R Shane Tubbs
PURPOSE: Fontanelles are a regular feature of infant development in which two segments of bone remain separated, leaving an area of fibrous membrane or a "soft spot" that acts to accommodate growth of the brain without compression by the skull. Of the six fontanelles in the human skull, the anterior fontanelle, located between the frontal and parietal bones, serves as an important anatomical diagnostic tool in the assessment of impairments of the skull and brain and allows access to the brain and ventricles in the infant...
April 10, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28396005/transradial-access-for-interventional-radiology-single-centre-procedural%C3%A2-and-clinical-outcome-analysis
#15
Avnesh S Thakor, Mohammed T Alshammari, David M Liu, John Chung, Stephen G F Ho, Gerald M Legiehn, Lindsay Machan, Aaron M Fischman, Rahul S Patel, Darren Klass
PURPOSE: The study sought to describe a single centre's technical approach to transradial intervention and report on clinical outcomes and safety. METHODS: A total of 749 transradial access (TRA) procedures were performed at a single hospital in 562 patients (174 women and 388 men). Procedures included 445 bland embolizations or chemoembolizations of the liver, 88 uterine artery embolizations, and 148 procedures for Selective Internal Radiation Therapy (Y90), which included mapping and administration...
April 7, 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/28389788/portal-vein-branching-order-helps-in-the-recognition-of-anomalous-right-sided-round-ligament-common-features-and-variations-in-portal-vein-anatomy
#16
Rikiya Yamashita, Toshihide Yamaoka, Ryuta Nishitai, Hiroyoshi Isoda, Kojiro Taura, Shigeki Arizono, Akihiro Furuta, Tsuyoshi Ohno, Ayako Ono, Kaori Togashi
PURPOSE: This study aimed to evaluate the common features and variations of portal vein anatomy in right-sided round ligament (RSRL), which can help propose a method to detect and diagnose this anomaly. METHODS: In this retrospective study of 14 patients with RSRL, the branching order of the portal tree was analyzed, with special focus on the relationship between the dorsal branch of the right anterior segmental portal vein (PA-D) and the lateral segmental portal vein (PLL), to determine the common features...
April 7, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28386838/minimally-invasive-medial-supraorbital-combined-subfrontal-interhemispheric-approach-to-the-anterior-communicating-artery-complex-a-cadaveric-study
#17
Alexander Spiessberger, F Baumann, E Nevzati, K F Kothbauer, J Fandino, C Muroi
INTRODUCTION: In selected cases, microsurgical clipping remains a valuable treatment alternative to endovascular occlusion of anterior communicating artery (AComA) aneurysms. Their clipping is challenging and carries a risk of postsurgical cognitive impairment. We evaluate the microsurgical anatomy of a new, minimally invasive combined interhemispheric-subfrontal approach to the AComA complex via a medial supraorbital craniotomy. METHODS: In this descriptive anatomic study, four alcohol-embedded, silicon-injected human cadaver heads were used...
April 7, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28386607/automatic-cystocele-severity-grading-in-ultrasound-by-spatio-temporal-regression
#18
Dong Ni, Xing Ji, Yaozong Gao, Jie-Zhi Cheng, Huifang Wang, Jing Qin, Baiying Lei, Tianfu Wang, Guorong Wu, Dinggang Shen
Cystocele is a common disease in woman. Accurate assessment of cystocele severity is very important for treatment options. The transperineal ultrasound (US) has recently emerged as an alternative tool for cystocele grading. The cystocele severity is usually evaluated with the manual measurement of the maximal descent of the bladder (MDB) relative to the symphysis pubis (SP) during Valsalva maneuver. However, this process is time-consuming and operator-dependent. In this study, we propose an automatic scheme for csystocele grading from transperineal US video...
October 2016: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/28384848/surgical-implications-of-portal-vein-variations-and-liver-segmentations-a-recent-update
#19
REVIEW
Showkathali Iqbal, Raiz Iqbal, Faiz Iqbal
The Couinaud's liver segmentation is based on the identification of portal vein bifurcation and origin of hepatic veins. It is widely used clinically, because it is better suited for surgery and is more accurate in localizing and monitoring various intra parenchymal lesions. According to standard anatomy, the portal vein bifurcates into right and left branches; the left vein drains segment II, III and IV and the right vein divides into two secondary branches - the anterior portal vein drains segments V and VIII, and the posterior drains segments VI and VII...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28384608/segmental-kinematic-analysis-of-planovalgus-feet-during-walking-in-children-with-cerebral-palsy
#20
Karen M Kruger, Katherine A Konop, Joseph J Krzak, Adam Graf, Haluk Altiok, Peter A Smith, Gerald F Harris
Pes planovalgus (flatfoot) is a common deformity among children with cerebral palsy. The Milwaukee Foot Model (MFM), a multi-segmental kinematic foot model, which uses radiography to align the underlying bony anatomy with reflective surface markers, was used to evaluate 20 pediatric participants (30feet) with planovalgus secondary to cerebral palsy prior to surgery. Three-dimensional kinematics of the tibia, hindfoot, forefoot, and hallux segments are reported and compared to an age-matched control set of typically-developing children...
March 23, 2017: Gait & Posture
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