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https://www.readbyqxmd.com/read/28944948/use-and-modifications-of-cervical-and-upper-thoracic-laminar-screws-in-posterior-stabilization
#1
Burak Eren, Azmi Tufan, Feyza Karagöz Güzey, İlker Güleç, Abdurrahim Taş, Özgür Yusuf Aktaş, Mustafa Safi Vatansever, Ebru Doruk, Murat Yücel, Mustafa Örnek
AIM: Laminar screw technique is used to stabilize C2 and other levels when other techniques cannot be performed. MATERIAL AND METHODS: The patients underwent laminar screws at cervical and upper thoracic levels in our clinic during 5 yearswere evaluated retrospectively. RESULTS: In 25 patients, 6 to 82 years old,total 54 laminar screws were used. Most frequent diagnoses were cervical spinal stenosis and craniovertebraljunction anomalies.There were handicaps to perform other type of screwsin 19 out of 25 screws during first 4 years, and 9 out of 29 in the last year (p=0...
July 16, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28944940/ruptured-distal-accessory-anterior-cerebral-artery-aneurysm-a-case-report-and-literature-review
#2
Alperen Sirin, Ulas Cikla, Kutluay Uluc, Mustafa Kemal Baskaya
Aneurysms of the distal anterior cerebral artery (dACA) are rare, consisting only 2-6% of all intracranial aneurysms. dACA aneurysms are often associated with anomalies such as azygous, bihemispheric and triplication of ACA. Among these anomalies accessory anterior cerebral artery (accACA) is an anatomical variant found in 3.3% to 15% of the population. Here we report a case of a 60-year-old female who presented with a Hunt and Hess grade II, Fisher grade III subarachnoid hemorrhage secondary to a ruptured saccular aneurysm originating from the pericallosal-callosomarginal artery bifurcation at the A3 segment of the accessory ACA and underwent an uncomplicated microsurgical clipping...
July 12, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28944620/intracoronary-snaring-of-the-retrograde-guidewire-how-to-overcome-extreme-takeoff-angles-in-chronic-total-occlusion-percutaneous-coronary-intervention
#3
Lorenzo Azzalini, Luciano Candilio, Mauro Carlino, Antonio Colombo
Extreme angulation of coronary artery takeoff represents a challenge for wiring and device advancement in percutaneous coronary intervention (PCI). This anatomic feature is particularly adverse in cases of chronic total occlusion (CTO) of the ostial-proximal segment of the target vessel. In this setting, the retrograde approach can help getting access to the occlusion. However, difficulties might arise at the critical step of wire externalization, due to the need to overcome the extreme ostial angle. Here, we describe a case of successful CTO PCI of the proximal circumflex artery, which presented an extreme angle at its takeoff...
September 25, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28943491/comparison-of-endovascular-versus-bypass-surgery-in-femoro-popliteal-tasc-ii-d-lesions-a-single-centre-study
#4
Gian Franco Veraldi, Luca Mezzetto, Marco Macrì, Paolo Criscenti, Arianna Corvasce, Ranieri Poli
BACKGROUND: In patients with severe occlusive disease (TASC II D) of the femoro-popliteal segment, the advantages of endovascular vs bypass revascularization still remain debated. Most reports available in literature comparing Percutaneous Trans-luminal Angioplasty (PTA) ± Bare Metal Stent (BMS) vs synthetic bypass analyse patients with heterogeneous anatomical lesions creating possible bias when results of different treatments are matched. In this study we compared early and midterm outcomes of PTA ± BMS vs heparin-bonded expanded polytetrafluoroethylene (ePTFE) graft (Propaten-Gore) + Linton patch in patient affected by symptomatic femoro-popliteal TASC II - D lesions...
September 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28940825/cluster-confidence-index-a-streamline-wise-pathway-reproducibility-metric-for-diffusion-weighted-mri-tractography
#5
Kesshi M Jordan, Bagrat Amirbekian, Anisha Keshavan, Roland G Henry
BACKGROUND: Diffusion-weighted magnetic resonance imaging tractography can be used to create models of white matter fascicles. Anatomical and pathological variability between subjects can drastically alter the tractography output, so standardizing results across a cohort is nontrivial. Furthermore, tractography methods have inherently low reproducibility due to stochasticity (for probabilistic methods) and subjective decisions, since the final fascicle model often requires a manual intervention step performed by an expert human operator to control both outliers and systematic false-positive pathways, as defined by prior knowledge of anatomy...
September 21, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28940372/esophagus-segmentation-in-ct-via-3d-fully-convolutional-neural-network-and-random-walk
#6
Tobias Fechter, Sonja Adebahr, Dimos Baltas, Ismail Ben Ayed, Christian Desrosiers, Jose Dolz
PURPOSE: Precise delineation of organs at risk is a crucial task in radiotherapy treatment planning for delivering high doses to the tumour while sparing healthy tissues. In recent years, automated segmentation methods have shown an increasingly high performance for the delineation of various anatomical structures. However, this task remains challenging for organs like the esophagus, which have a versatile shape and poor contrast to neighboring tissues. For human experts, segmenting the esophagus from CT images is a time-consuming and error-prone process...
September 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28939538/incremental-value-of-multiparametric-whole-body-mr-imaging-over-whole-spine-magnetic-resonance-imaging-in-neurofibromatosis-type-i-patients
#7
Lihua Zhang, Dessouky Riham, Yin Xi, Avneesh Chhabra, Lu Q Le
AIM: To determine the incremental value of multiparametric whole-body (WBMRI) over whole spine magnetic resonance imaging (WSMRI) in neurofibromatosis type1 (NF1) patients. METHODS: A consecutive series of 30 patients with known NF1 underwent WBMRI screening using anatomic, diffusion and contrast imaging over a 30-month period. 13/30 patients also had WSMRI. Tumors were classified per location and morphology and were software segmented to determine numbers and volumes...
September 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28935510/intraoperative-computed-tomography-navigation-during-thoracoscopic-segmentectomy-for-small-sized-lung-tumors
#8
Sung Soo Chang, Taku Okamoto, Yoshimasa Tokunaga, Takayuki Nakano
Performance of thoracoscopic pulmonary segmentectomy for primary lung cancer or pulmonary metastases has recently increased. In patients with emphysema, identification of the intersegmental line is often difficult. For nonpalpable lesions, securing a sufficient surgical margin is more likely to be uncertain. The purpose of this study was to evaluate the efficacy of intraoperative computed tomography (CT) scan during video-assisted thoracoscopic surgery (VATS) pulmonary segmentectomy. This study included 12 patients who underwent intraoperative CT-assisted VATS segmentectomy between January 2015 and August 2016...
August 24, 2017: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28935012/-combining-3d-ctba-and-3d-vats-single-operation-hole-to-%C3%A2-anatomical-segmentectomy-in-the-treatment-of-non-small-cell-lung-cancer
#9
Xiaowei She, Yunbin Gu, Chun Xu, Xinyu Song, Chang Li, Cheng Ding, Jun Chen, Yongsheng Gong, Jun Zhao
BACKGROUND: China is a high-incidence area of lung cancer, and its morbidity and mortality were the highest in malignant tumors. At present, the popularization of low-dose computed tomography (CT) examination has significantly improved the detection rate of early lung cancer, anatomical segmentectomy is currently widely used early in non-small cell lung cancer (NSCLC) and those who cannot tolerate lobectomy in patients with lung cancer. However, the anatomical structure of segment and its surgical operation is relatively complex, lead to segmentectomy has a high risk and difficulty...
September 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28931838/cerebellar-anatomical-alterations-and-attention-to-eyes-in-autism
#10
Charles Laidi, Jennifer Boisgontier, M Mallar Chakravarty, Sevan Hotier, Marc-Antoine d'Albis, Jean-Franc Ois Mangin, Gabriel A Devenyi, Richard Delorme, Federico Bolognani, Christian Czech, Céline Bouquet, Elie Toledano, Manuel Bouvard, Doriane Gras, Julie Petit, Marina Mishchenko, Alexandru Gaman, Isabelle Scheid, Marion Leboyer, Tiziana Zalla, Josselin Houenou
The cerebellum is implicated in social cognition and is likely to be involved in the pathophysiology of autism spectrum disorder (ASD). The goal of our study was to explore cerebellar morphology in adults with ASD and its relationship to eye contact, as measured by fixation time allocated on the eye region using an eye-tracking device. Two-hundred ninety-four subjects with ASD and controls were included in our study and underwent a structural magnetic resonance imaging scan. Global segmentation and cortical parcellation of the cerebellum were performed...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28930092/a-monte-carlo-study-to-assess-the-effect-of-1-5t-magnetic-fields-on-the-overall-robustness-of-pencil-beam-scanning-proton-radiotherapy-plans-for-prostate-cancer
#11
Christopher Kurz, Guillaume Landry, Andreas Franz Resch, Georgios Dedes, Florian Kamp, Ute Ganswindt, Claus Belka, Bas W Raaymakers, Katia Parodi
Combining magnetic-resonance imaging (MRI) and proton therapy (PT) using pencil-beam scanning (PBS) may improve image-guided radiotherapy. We aimed at assessing the impact of a magnetic field on PBS-PT plan quality and robustness. Specifically, the robustness against anatomical changes and positioning errors in an MRI-guided scenario with a 30 cm radius 1.5 T magnetic field was studied for prostate PT. Five prostate cancer patients with three consecutive CT images (CT1-3) were considered. Single-field uniform dose PBS-PT plans were generated on the segmented CT1 with Monte-Carlo-based treatment planning software for inverse optimization...
September 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28927207/surgical-approaches-to-the-temporal-horn-an-anatomic-analysis-of-white-matter-tract-interruption
#12
Paulo A S Kadri, Jean G de Oliveira, Niklaus Krayenbühl, Ugur Türe, Evandro P L de Oliveira, Ossama Al-Mefty, Guilherme C Ribas
BACKGROUND: Surgical access to the temporal horn is necessary to treat tumors and vascular lesions, but is used mainly in patients with mediobasal temporal epilepsy. The surgical approaches to this cavity fall into 3 primary categories: lateral, inferior, and transsylvian. The current neurosurgical literature has underestimated the interruption of involved fiber bundles and the correlated clinical manifestations. OBJECTIVE: To delineate the interruption of fiber bundles during the different approaches to the temporal horn...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28926131/region-specific-impairment-of-the-cervical-spinal-cord-sc-in-amyotrophic-lateral-sclerosis-a-preliminary-study-using-sc-templates-and-quantitative-mri-diffusion-tensor-imaging-inhomogeneous-magnetization-transfer
#13
Henitsoa Rasoanandrianina, Aude-Marie Grapperon, Manuel Taso, Olivier M Girard, Guillaume Duhamel, Maxime Guye, Jean-Philippe Ranjeva, Shahram Attarian, Annie Verschueren, Virginie Callot
In this preliminary study, our objective was to investigate the potential of high-resolution anatomical imaging, diffusion tensor imaging (DTI) and conventional/inhomogeneous magnetization transfer imaging [magnetization transfer (MT)/inhomogeneous magnetization transfer (ihMT)] at 3 T, analyzed with template-extracted regions of interest, to measure the atrophy and structural changes of white (WM) and gray (GM) matter spinal cord (SC) occurring in patients with amyotrophic lateral sclerosis (ALS). Ten patients with ALS and 20 age-matched healthy controls were recruited...
September 19, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28925823/deep-learning-mr-imaging-based-attenuation-correction-for-pet-mr-imaging
#14
Fang Liu, Hyungseok Jang, Richard Kijowski, Tyler Bradshaw, Alan B McMillan
Purpose To develop and evaluate the feasibility of deep learning approaches for magnetic resonance (MR) imaging-based attenuation correction (AC) (termed deep MRAC) in brain positron emission tomography (PET)/MR imaging. Materials and Methods A PET/MR imaging AC pipeline was built by using a deep learning approach to generate pseudo computed tomographic (CT) scans from MR images. A deep convolutional auto-encoder network was trained to identify air, bone, and soft tissue in volumetric head MR images coregistered to CT data for training...
September 19, 2017: Radiology
https://www.readbyqxmd.com/read/28925375/modelling-the-effect-of-electrode-displacement-on-transcranial-direct-current-stimulation-tdcs
#15
Sriharsha Ramaraju, Mohammed Ali Roula, Peter McCarthy
Transcranial Direct Current Stimulation (tDCS) is a neuromodulatory technique that delivers a low-intensity, direct current to cortical areas with the purpose of modulating underlying brain activity. Recent studies have reported inconsistencies in tDCS outcomes. The underlying assumption of many tDCS studies has been that replication of electrode montage equates to replicating stimulation conditions. It is possible however that anatomical difference between subjects, as well as inherent inaccuracies in montage placement, could affect current flow to targeted areas...
September 19, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28921849/effects-of-pre-surgical-nasoalveolar-moulding-on-maxillary-arch-and-nasal-form-in-unilateral-cleft-lip-and-palate-before-lip-surgery
#16
T Fuchigami, N Kimura, T Kibe, M Tezuka, M S Amir, H Suga, Y Takemoto, M Hashiguchi, A Maeda-Iino, N Nakamura
OBJECTIVES: To investigate the effects of pre-surgical nasoalveolar moulding (PNAM) on the maxillary arch and nasal form in patients with unilateral cleft lip and palate (UCLP). SETTING AND SAMPLE POPULATION: This is a retrospective case series study. The subjects were infants with complete UCLP who were treated with PNAM (n = 18) at Kagoshima University Medical and Dental Hospital (Japan) between 2006 and 2013. MATERIAL AND METHODS: Maxillary dental casts and facial photographs were taken at the time of the first visit and immediately prior to lip surgery to evaluate the maxillary arch and nasal form changes...
September 18, 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28920552/clinical-correlation-of-the-area-of-inferior-vena-cava-iliac-and-femoral-veins-for-stent-use
#17
Afsha Aurshina, Arkady Ganelin, Anil Hingorani, Sheila Blumberg, Yuriy Ostrozhynskyy, Borislav Kheyson, Enrico Ascher
Objective The purpose of the study is to evaluate normal anatomical areas of infrarenal inferior vena cava, common iliac, external iliac and common femoral veins by intravascular ultrasound with the goal of assisting the development of venous-specific stents in the treatment of iliac vein stenosis. Method From February 2012 to December 2013, 656 office-based venograms were performed in our facility. Among them, 576 were stented and 80 were not. The measurements of veins were done intraoperatively using an intravascular ultrasound catheter to record areas of the inferior vena cava, proximal, middle and distal segments of common iliac vein, external iliac vein and common femoral vein...
January 1, 2017: Vascular
https://www.readbyqxmd.com/read/28918686/sensitivity-of-post-treatment-positron-emission-tomography-computed-tomography-to-detect-inter-fractional-range-variations-in-scanned-ion-beam-therapy
#18
Josefine Handrack, Thomas Tessonnier, Wenjing Chen, Jakob Liebl, Jürgen Debus, Julia Bauer, Katia Parodi
BACKGROUND: Ion therapy, especially with modern scanning beam delivery, offers very sharp dose gradients for highly conformal cancer treatment. However, it is very sensitive to uncertainties of tissue stopping properties as well as to anatomical changes and setup errors, making range verification highly desirable. To this end, positron emission tomography (PET) can be used to measure decay products of β(+)-emitters created in interactions inside the patient. This work investigates the sensitivity of post treatment PET/CT (computed tomography) to detect inter-fractional range variations...
September 18, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28918316/mr-guided-joint-reconstruction-of-activity-and-attenuation-in-brain-pet-mr
#19
Abolfazl Mehranian, Habib Zaidi, Andrew J Reader
With the advent of time-of-flight (TOF) PET scanners, joint maximum-likelihood reconstruction of activity and attenuation (MLAA) maps has recently regained attention for the estimation of PET attenuation maps from emission data. However, the estimated attenuation and activity maps are scaled by unknown scaling factors. We recently demonstrated that in hybrid PET-MR, the scaling issue of this algorithm can be effectively addressed by imposing MR spatial constraints on the estimation of attenuation maps using a penalized MLAA (P-MLAA(+)) algorithm...
September 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28917553/absence-of-rotational-activity-detected-using-two-dimensional-phase-mapping-in-corresponding-three-dimensional-phase-maps-in-human-persistent-atrial-fibrillation
#20
Bhupesh Pathik, Jonathan M Kalman, Tomos Walters, Pawel Kuklik, Jichao Zhao, Andrew Madry, Prashanthan Sanders, Peter M Kistler, Geoffrey Lee
BACKGROUND: Current phase mapping systems for atrial fibrillation(AF) create two-dimensional(2D) maps. This process may affect the accurate detection of rotors. We developed a three-dimensional(3D) phase mapping technique that utilizes the 3D locations of basket electrodes to project phase onto patient-specific left atrial(LA) 3D surface anatomy. OBJECTIVES: We sought to determine whether rotors detected in 2D phase maps were present at corresponding time segments and anatomical locations on 3D phase maps...
September 13, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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