scholarly journals A Kind of CTA Bone Removal Technology Based on the Improved Watershed Algorithm

2012 ◽  
Vol 5 (5) ◽  
Author(s):  
Tan Jianhao ◽  
Zhang Jing ◽  
Wang Ya
Keyword(s):  
Watershed Algorithm ◽  
Bone Removal ◽  
Removal Technology

A Minimally-Interactive Watershed Algorithm Designed for Efficient CTA Bone Removal

2006 ◽  
pp. 178-189 ◽  
Author(s):  
Horst K. Hahn ◽  
Markus T. Wenzel ◽  
Olaf Konrad-Verse ◽  
Heinz-Otto Peitgen
Keyword(s):  
Watershed Algorithm ◽  
Bone Removal

PEID (Percutaneous Endoscopic Interlaminar Discectomy): Cautionary Points Based on the Evidence

2018 ◽  
Vol 1 (2) ◽  
pp. 7
Author(s):  
Jun Ho Lee
Keyword(s):  
Lumbar Disc ◽  
Lumbar Discectomy ◽  
Radiographic Evaluation ◽  
Operative Indication ◽  
Endoscopic Techniques ◽  
Bone Removal ◽  
Iatrogenic Trauma ◽  
Minimal Damage ◽  
Surgical Modality ◽  
Endoscopic Lumbar Discectomy

Background: Percutaneous endoscopic lumbar discectomy (PELD) is one of the most sophisticated operative procedures for the treatment of lumbar disc herniation (LDH). Endoscopic techniques are now becoming standard in many areas due to expanded technical possibilities of full-endoscopic transforaminal or interlaminar resection of herniated lumbar discs as well as stenosis. However conventional percutaneous endoscopic interlaminar discectomy (PEID) disc operations may sometimes result in subsequent untoward complications due to unnoticed iatrogenic trauma to neural structures, which is mostly related to an anatomical limitation during endoscope insertion.Methods: An appropriate operative indication of the PEID without bone removal or laminectomy can be used to treat LDH cases with an enough interlaminar space (at least ≥ 20 mm by bi-facetal distance) from the reported evidences. Otherwise, there might be several indications for requirement of bone removal; a narrow interlaminar space, disappearance of the concave shape of the upper vertebral laminae, high-grade migration of LDH, recurrent LDH, obesity, or an immobile nerve root.Conclusion: The significance of PEID lies also in its minimal damage to surrounding structures such as muscle, bone, and ligaments. A discrete radiographic evaluation from the patient preoperatively is mandatory before choosing a proper endoscopic surgical modality for the sake of optimal clinical outcome after PEID. 

Aumento de coroa estética sem elevação de retalho – abordagem minimamente invasiva

2020 ◽  
Vol 12 (45) ◽  
pp. 34-39
Author(s):  
Flavia Sukekava ◽  
Julia Helena Luiz ◽  
Paloma Palma ◽  
Jaques Luiz
Keyword(s):  
Minimally Invasive ◽  
Correct Diagnosis ◽  
Case Series ◽  
Minimally Invasive Techniques ◽  
Bone Removal ◽  
Use Of Technology ◽  
Treatment Plans ◽  
Invasive Techniques ◽  
Crown Lengthening ◽  
Gummy Smile

Gummy smile is a characteristic in which the patient exposes more than 2 mm of keratinized gingiva in forced smile. With a multifactorial cause, its correct planning depends directly on the correct diagnosis. Usually, the procedures that involve manipulation and the enlargement of the aesthetical crown lengthening are surgical. The objective of this case series was to show the advantages of surgical crown augmentation surgery in aesthetic areas with minimally invasive techniques. Three cases of gummy smile were presented, with different treatment plans and techniques for execution. In the 3 cases, bone removal was performed with piezoelectric ultrasound, which made the postoperative more comfortable for patients. These cases illustrate the use of technology to reduce morbidity in patients who need to undergo bone removal to treat gingival smile.

Segmentation In Medical Resonance images to extract the cancerous nodule for early diagnosis on cancer

2012 ◽  
Vol 3 (2) ◽  
pp. 253-255
Author(s):  
Raman Brar
Keyword(s):  
Human Lung ◽  
Research Work ◽  
Vital Role ◽  
Watershed Algorithm ◽  
Segmentation Method ◽  
Resonance Imaging ◽  
Segmentation Methods ◽  
Segmentation Accuracy ◽  
Background Segmentation ◽  
Lung Mri

Image segmentation plays a vital role in several medical imaging programs by assisting the delineation of physiological structures along with other parts. The objective of this research work is to segmentize human lung MRI (Medical resonance Imaging) images for early detection of cancer.Watershed Transform Technique is implemented as the Segmentation method in this work. Some comparative experiments using both directly applied watershed algorithm and after marking foreground and computed background segmentation methods show the improved lung segmentation accuracy in some image cases.

Hair Removal Technology Selection

2013 ◽  
Author(s):  
Farshad Madani ◽  
Benjamin Stolt ◽  
Greg Wease ◽  
Phaneendra Rampalli
Keyword(s):  
Technology Selection ◽  
Hair Removal ◽  
Removal Technology

Upgrading Wastewater Treatment Plants for Biological Nutrient Removal

1990 ◽  
Vol 22 (7-8) ◽  
pp. 53-60 ◽  
Author(s):  
B. Rabinowitz ◽  
T. D. Vassos ◽  
R. N. Dawson ◽  
W. K. Oldham
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Design Flow ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Conventional Activated Sludge ◽  
Recent Developments ◽  
Removal Technology ◽  
Biological Nitrogen

A brief review of recent developments in biological nitrogen and phosphorus removal technology is presented. Guidelines are outlined of how current understanding of these two removal mechanisms can be applied in the upgrading of existing wastewater treatment plants for biological nutrient removal. A case history dealing with the upgrading of the conventional activated sludge process located at Penticton, British Columbia, to a biological nutrient removal facility with a design flow of 18,200 m3/day (4.0 IMGD) is presented as a design example. Process components requiring major modification were the headworks, bioreactors and sludge handling facilities.

scholarly journals Mercury Speciation in Various Coals Based on Sequential Chemical Extraction and Thermal Analysis Methods

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2361
Author(s):  
Yinjiao Su ◽  
Xuan Liu ◽  
Yang Teng ◽  
Kai Zhang
Keyword(s):  
Thermal Stability ◽  
Coal Combustion ◽  
Decomposition Methods ◽  
Chemical Extraction ◽  
Anthropogenic Source ◽  
Coal Rank ◽  
Coal Pyrolysis ◽  
Mercury Emissions ◽  
Sequential Chemical Extraction ◽  
Removal Technology

Coal combustion is an anthropogenic source of mercury (Hg) emissions to the atmosphere. The strong toxicity and bioaccumulation potential have prompted attention to the control of mercury emissions. Pyrolysis has been regarded as an efficient Hg removal technology before coal combustion and other utilization processes. In this work, the Hg speciation in coal and its thermal stability were investigated by combined sequential chemical extraction and temperature programmed decomposition methods; the effect of coal rank on Hg speciation distribution and Hg release characteristics were clarified based on the weight loss of coal; the amount of Hg released; and the emission of sulfur-containing gases during coal pyrolysis. Five species of mercury were determined in this study: exchangeable Hg (F1), carbonate + sulfate + oxide bound Hg (F2), silicate + aluminosilicate bound Hg (F3), sulfide bound Hg (F4), and residual Hg (F5), which are quite distinct in different rank coals. Generally, Hg enriched in carbonates, sulfates, and oxides might migrate to sulfides with the transformation of minerals during the coalification process. The order of thermal stability of different Hg speciation in coal is F1 < F5 < F2 < F4 < F3. Meanwhile, the release of Hg is accompanied with sulfur gases during coal pyrolysis, which is heavily dependent on the coal rank.

scholarly journals Surgical Treatment of Diffuse Idiopathic Skeletal Hyperostosis (DISH) Involving the Cervical Spine: Technical Nuances and Outcome of a Multicenter Experience

2021 ◽  
pp. 219256822098827
Author(s):  
Giorgio Lofrese ◽  
Alba Scerrati ◽  
Massimo Balsano ◽  
Roberto Bassani ◽  
Michele Cappuccio ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Clinical Outcome ◽  
Waiting Times ◽  
Diffuse Idiopathic Skeletal Hyperostosis ◽  
Surgical Techniques ◽  
Rare Condition ◽  
Surgical Strategies ◽  
Bone Removal ◽  
Mild Dysphagia

Study Design: Retrospective multicenter. Objectives: diffuse idiopathic skeletal hyperostosis (DISH) involving the cervical spine is a rare condition determining disabling aero-digestive symptoms. We analyzed impact of preoperative settings and intraoperative techniques on outcome of patients undergoing surgery for DISH. Methods: Patients with DISH needing for anterior cervical osteophytectomy were collected. Swallow studies and endoscopy supported imaging in targeting bone decompression. Patients characteristics, clinico-radiological presentation, outcome and surgical strategies were recorded. Impact on clinical outcome of duration and time to surgery and different surgical techniques was evaluated through ANOVA. Results: 24 patients underwent surgery. No correlation was noted between specific spinal levels affected by DISH and severity of pre-operative dysphagia. A trend toward a full clinical improvement was noted preferring the chisel ( P = 0.12) to the burr ( P = 0.65), and whenever C2-C3 was decompressed, whether hyperostosis included that level ( P = 0.15). Use of curved chisel reduced the surgical times ( P = 0.02) and, together with the nasogastric tube, the risk of complications, while bone removal involving 3 levels or more ( P = 0.04) and shorter waiting times for surgery ( P < 0.001) positively influenced a complete swallowing recovery. Early decompressions were preferred, resulting in 66.6% of patients reporting disappearance of symptoms within 7 days. One and two recurrences respectively at clinical and radiological follow-up were registered 18-30 months after surgery. Conclusion: The “age of DISH” counts more than patients’ age with timeliness of decompression being crucial in determining clinical outcome even with a preoperative mild dysphagia. Targeted bone resections could be reasonable in elderly patients, while in younger ones more extended decompressions should be preferred.

Posterior Midline Approach for a C2 Schwannoma: 2-Dimensional Operative Video

2020 ◽  
Author(s):  
Sorin Aldea ◽  
Abdu Alkhairy ◽  
Irina Joitescu ◽  
Caroline Le Guerinel
Keyword(s):  
Posterior Approach ◽  
Main Step ◽  
Surgical Removal ◽  
Posterior Arch ◽  
Favorable Result ◽  
Lateral Compression ◽  
Bone Removal ◽  
Far Lateral ◽  
Midline Approach ◽  
Posterior Midline

Abstract C2 schwannomas are rare lesions that may develop in the spinal canal, in the area of the C2 ganglion situated posterior to the C1C2 articulation, in the extraspinal area or in a combination of these 3 sectors.1,2 The surgical removal of these lesions is delicate because of the intimate relationships the schwannomas develop with the V3 segment of the vertebral artery.  A variety of lateral, far-lateral, or extreme lateral approaches have been described in order to tackle these lesions. We use a posterior midline approach that takes advantage of the predominantly extradural development of C2 schwannomas. In this technique, the main step is the debulking of the posterior articular sector of the tumor, which is easily accessible through a midline posterior approach and necessitates minimal bone removal. In most cases, removal of the homolateral posterior arch of C1 is sufficient in order to create an adequate access. These maneuvers create the necessary space for dissecting both the intradural and extraspinal sectors of the schwannoma.  We present this technique through a case with a minimal intradural component exerting mainly a lateral compression of the spinal cord. The tumor was operated through the midline mini-invasive posterior approach with a favorable result. We demonstrate the surgical technique in video and discuss the nuances.

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