Search results for: Raj Shekhar

Items from 1 to 20 out of 63 results

article

Fast calibration of electromagnetically tracked oblique-viewing rigid endoscopes

Xinyang Liu, Christina E. Rice, Raj Shekhar

International Journal of Computer Assisted Radiology and Surgery > 2017 > 12 > 10 > 1685-1695

Purpose The oblique-viewing (i.e., angled) rigid endoscope is a commonly used tool in conventional endoscopic surgeries. The relative rotation between its two moveable parts, the telescope and the camera head, creates a rotation offset between the actual and the projection of an object in the camera image. A calibration method tailored to compensate such offset is needed. Methods We developed a...

article

Automated Identification of Innocent Still's Murmur in Children

Sukryool Kang, Robin Doroshow, James McConnaughey, Raj Shekhar

IEEE Transactions on Biomedical Engineering > 2017 > 64 > 6 > 1326 - 1334

Objective: Still's murmur is the most common innocent heart murmur in children. It is also the most commonly misdiagnosed murmur, resulting in a high number of unnecessary referrals to pediatric cardiologist. The purpose of this study was to develop a computer algorithm for automated identification of Still's murmur that may help reduce unnecessary referrals. Methods: We first developed an accurate...

article

Time to Computerized Tomography Scan, Age, and Mortality in Acute Stroke

Phyo Kyaw Myint, Andrew C. Kidd, Chun Shing Kwok, Stanley D. Musgrave, more

Journal of Stroke and Cerebrovascular Diseases > 2016 > 25 > 12 > 3005-3012

Time to computerized tomography (CT) is important to institute appropriate and timely hyperacute management in stroke. We aimed to evaluate mortality outcomes in relation to age and time to CT scan.We used routinely collected data in 8 National Health Service trusts in East of England between September 2008 and April 2011. Stroke cases were prospectively identified and confirmed. Odds ratios (ORs)...

article

Software-based PET-MR image coregistration: combined PET-MRI for the rest of us!

Matthew S. Robertson, Xinyang Liu, William Plishker, George F. Zaki, more

Pediatric Radiology > 2016 > 46 > 11 > 1552-1561

Background With the introduction of hybrid positron emission tomography/magnetic resonance imaging (PET/MRI), a new imaging option to acquire multimodality images with complementary anatomical and functional information has become available. Compared with hybrid PET/computed tomography (CT), hybrid PET/MRI is capable of providing superior anatomical detail while removing the radiation exposure associated...

chapter

Sequential analysis driven reset optimization to improve power, area and routability

Srihari Yechangunja, Raj Shekhar, Mohit Kumar, Nikhil Tripathi, more

2016 Design, Automation & Test in Europe Conference & Exhibition (DATE) > 551 - 554

2016 Design, Automation & Test in Europe Conference & Exhibition (DATE)

Resets are required in the design to initialize the hardware for system operation and to force it into a known state for simulation or to recover from an error. Given the increasing design complexity and time-to-market pressures, figuring out the registers which do not require resets is extremely challenging. In this paper, we present a novel algorithm which uses observability based sequential analysis...

article

Enhanced removal of dissolved aniline from water under combined system of nano zero-valent iron and Pseudomonas putida

Raj Shekhar Bose, Sayan Dey, Saswati Saha, Chandan Kr. Ghosh, more

Sustainable Water Resources Management > 2016 > 2 > 2 > 143-159

Aniline is a toxic chemical released by many industries. Removal of pollutants by micro-organisms is the most recent area of research whereas nano zero valent iron (nZVI) in recent time has been widely used in treatment of groundwater. The present study aims to understand the nature of interaction of nZVI with bacteria and removal of aniline under a combined system of bacteria and nZVI. nZVI were...

chapter

Characterization of Speed and Accuracy of a Nonrigid Registration Accelerator on Pre- and Intraprocedural Images

Raj Shekhar, William Plishker, Sheng Xu, Jochen Kruecker, more

IFMBE Proceedings > 26th Southern Biomedical Engineering Conference SBEC 2010, April 30 - May 2, 2010, College Park, Maryland, USA > Imaging > 473-476

Targeting of FDG-avid PET-visible but CT-invisible lesions with CT is, by definition, challenging and is a source of uncertainty in many percutaneous ablative procedures. Preprocedural PET has been overlaid on intraprocedural CT to improve the visualization of such lesions. Such an approach depends on registration of PET and CT, but current registration methods remain mostly slow and manual and do...

chapter

Medical Image Processing

Raj Shekhar, Vivek Walimbe, William Plishker

Handbook of Signal Processing Systems > Applications Managing Editor: Shuvra Bhattacharyya > 213-242

Of many types of images around us, medical images are a ubiquitous type since xrays were first discovered in 1985. The recent years, especially after the introduction of computed tomography (CT) in 1972, have witnessed an explosion in the use of medical imaging and, consequently, the volume of medical image data being produced. It is estimated that 40,000 terabytes of medical image data were generated...

article

Rock inhabiting potassium solubilizing bacteria from Kerala, India: characterization and possibility in chemical K fertilizer substitution

Indira Parameswaran Anjanadevi, Neetha Soma John, Kuzhivilayil Susan John, Muthulekshmi Lajapathy Jeeva, more

Journal of Basic Microbiology > 56 > 1 > 67 - 77

The role of rock inhabiting bacteria in potassium (K) solubilization from feldspar and their application in crop nutrition through substitution of fertilizer K was explored through the isolation of 36 different bacteria from rocks of a major hill station at Ponmudi in Thiruvananthapuram, Kerala, India. A comprehensive characterization of K solubilization from feldspar was achieved with these isolates...

article

On-demand calibration and evaluation for electromagnetically tracked laparoscope in augmented reality visualization

Xinyang Liu, William Plishker, George Zaki, Sukryool Kang, more

International Journal of Computer Assisted Radiology and Surgery > 2016 > 11 > 6 > 1163-1171

Purpose Common camera calibration methods employed in current laparoscopic augmented reality systems require the acquisition of multiple images of an entire checkerboard pattern from various poses. This lengthy procedure prevents performing laparoscope calibration in the operating room (OR). The purpose of this work was to develop a fast calibration method for electromagnetically (EM) tracked laparoscopes,...

article

The Utility of Cloud Computing in Analyzing GPU-Accelerated Deformable Image Registration of CT and CBCT Images in Head and Neck Cancer Radiation Therapy

George Zaki, William Plishker, Wen Li, Junghoon Lee, more

IEEE Journal of Translational Engineering in Health and Medicine > 2016 > 4 > 1 - 11

The images generated during radiation oncology treatments provide a valuable resource to conduct analysis for personalized therapy, outcomes prediction, and treatment margin optimization. Deformable image registration (DIR) is an essential tool in analyzing these images. We are enhancing and examining DIR with the contributions of this paper: 1) implementing and investigating a cloud and graphic processing...

article

Grasses and legumes facilitate phytoremediation of metalliferous soils in the vicinity of an abandoned chromite–asbestos mine

Adarsh Kumar, Subodh Kumar Maiti, Tripti, Majeti Narasimha Vara Prasad, more

Journal of Soils and Sediments > 2017 > 17 > 5 > 1358-1368

Purpose The present study was carried out in Roro region, Chaibasa, Jharkhand, India, to assess the impact of chromite–asbestos mine waste (CMW) on a nearby agroecosystem. The role of metal-accumulating grass–legume association in facilitating phytoremediation was investigated. Materials and methods Soil and plant samples were collected from (i) chromite–asbestos mine waste (CMW) with Cynodon dactylon...

article

Characterization of Trichoderma isolates against Sclerotium rolfsii, the collar rot pathogen of Amorphophallus – A polyphasic approach

Neetha Soma John, I.P. Anjanadevi, Vishnu Sukumari Nath, Senthil Alias Sankar, more

Biological Control > 2015 > 90 > Complete > 164-172

The aim of the present study was to characterize ten selected isolates of Trichoderma with differential inhibitory potential over the collar rot pathogen of Amorphophallus, Sclerotium rolfsii. Use of a polyphasic approach which combined the morphological, molecular and biochemical attributes revealed inter specific and intra specific diversity among different isolates. Strains with the best in vitro...

chapter

Heart Sound Segmentation toward Automated Heart Murmur Classification in Pediatric Patents

Sukryool Kang, Robin Doroshow, James McConnaughey, Ahsan Khandoker, more

2015 8th International Conference on Signal Processing, Image Processing and Pattern Recognition (SIP) > 9 - 12

2015 8th International Conference on Signal Processing, Image Processing and Pattern Recognition (SIP)

A computerized heart murmur classification requires localization of two primary heart sounds, S1 and S2. In this paper, we propose an automatic segmentation method for pediatric heart sounds. After identifying S1 and S2 candidates from the envelope signal, we identify the best S1 and S2 pairs from all possible combinations of candidates by examining the signal correlation and cardiac cycle information...

article

Fabrication and characterization of medical grade polyurethane composite catheters for near-infrared imaging

André T. Stevenson, Laura M. Reese, Tanner K. Hill, Jeffrey McGuire, more

Biomaterials > 2015 > 54 > Complete > 168-176

Peripherally inserted central catheters (PICCs) are hollow polymeric tubes that transport nutrients, blood and medications to neonates. To determine proper PICC placement, frequent X-ray imaging of neonates is performed. Because X-rays pose severe health risks to neonates, safer alternatives are needed. We hypothesize that near infrared (NIR) polymer composites can be fabricated into catheters by...

article

Room temperature synthesis of hydrated nickel(III) oxide and study of its effect on Cr(VI) ions removal and bacterial culture

Sayan Dey, Swarupananda Bhattacharjee, Raj Shekhar Bose, Chandan Kr. Ghosh

Applied Physics A > 2015 > 119 > 4 > 1343-1354

Cr(VI) ion is a toxic inorganic affluent that causes carcinogenic effects on the human body. Another problem that requires immediate attention is the fouling of water borne metal surface by micro-organisms. The present study aims to suggest the synthesis of Ni₂O₃·H₂O nanoparticles and to investigate its heavy metal adsorption capacity and bacteriotoxicity in order to address the current global problems...

chapter

Automatic labeling of liver veins in CT by probabilistic backward tracing

Xin Kang, Qian Zhao, Karun Sharma, Raj Shekhar, more

2014 IEEE 11th International Symposium on Biomedical Imaging (ISBI) > 1115 - 1118

2014 IEEE 11th International Symposium on Biomedical Imaging (ISBI 2014)

The mapping and labeling of the major intra-hepatic blood vessels may facilitate planning liver interventions and surgery. However, the automatic labeling of liver veins is challenging due to imperfect segmentations caused by partial volume effects and image resolution that result in undesirable false connections between hepatic and portal veins. In this paper, we propose a novel method to model the...

article

Mine spoil acts as a sink of carbon dioxide in Indian dry tropical environment

Nimisha Tripathi, Raj Shekhar Singh, C Paul Nathanail

Science of the Total Environment > 2014 > 468-469 > Complete > 1162-1171

Economically important mining operations have adverse environmental impacts: top soil, subsoil and overburden are relocated; resulting mine spoils constitute an unaesthetic landscape and biologically sterile or compromised habitat, and act as source of pollutants with respect to air dust, heavy metal contamination to soil and water bodies. Where such spoils are revegetated, however, they can act as...

article

Characterization of Trichoderma spp. antagonistic to Phytophthora colocasiae associated with leaf blight of taro

Vishnu Sukumari Nath, Neetha Soma John, Indira Parameswaran Anjanadevi, Vinayaka Mahabaleswar Hegde, more

Annals of Microbiology > 2014 > 64 > 4 > 1513-1522

Eighteen Trichoderma strains isolated from soils of different regions of India were analyzed for their biocontrol potential against the taro leaf blight pathogen Phytophthora colocasiae. The strains were characterized using a combination of phenotypic and molecular approaches, viz., in vitro antagonism, extracellular enzyme production, ITS and tef1 gene sequencing and AFLP analysis. Eight isolates...

article

Stereoscopic augmented reality for laparoscopic surgery

Xin Kang, Mahdi Azizian, Emmanuel Wilson, Kyle Wu, more

Surgical Endoscopy > 2014 > 28 > 7 > 2227-2235

Background Conventional laparoscopes provide a flat representation of the three-dimensional (3D) operating field and are incapable of visualizing internal structures located beneath visible organ surfaces. Computed tomography (CT) and magnetic resonance (MR) images are difficult to fuse in real time with laparoscopic views due to the deformable nature of soft-tissue organs. Utilizing emerging camera...

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INFONA - science communication portal

Search results for: Raj Shekhar

Fast calibration of electromagnetically tracked oblique-viewing rigid endoscopes

Automated Identification of Innocent Still's Murmur in Children

Time to Computerized Tomography Scan, Age, and Mortality in Acute Stroke

Software-based PET-MR image coregistration: combined PET-MRI for the rest of us!

Sequential analysis driven reset optimization to improve power, area and routability

Enhanced removal of dissolved aniline from water under combined system of nano zero-valent iron and Pseudomonas putida

Characterization of Speed and Accuracy of a Nonrigid Registration Accelerator on Pre- and Intraprocedural Images

Medical Image Processing

Rock inhabiting potassium solubilizing bacteria from Kerala, India: characterization and possibility in chemical K fertilizer substitution

On-demand calibration and evaluation for electromagnetically tracked laparoscope in augmented reality visualization

The Utility of Cloud Computing in Analyzing GPU-Accelerated Deformable Image Registration of CT and CBCT Images in Head and Neck Cancer Radiation Therapy

Grasses and legumes facilitate phytoremediation of metalliferous soils in the vicinity of an abandoned chromite–asbestos mine

Characterization of Trichoderma isolates against Sclerotium rolfsii, the collar rot pathogen of Amorphophallus – A polyphasic approach

Heart Sound Segmentation toward Automated Heart Murmur Classification in Pediatric Patents

Fabrication and characterization of medical grade polyurethane composite catheters for near-infrared imaging

Room temperature synthesis of hydrated nickel(III) oxide and study of its effect on Cr(VI) ions removal and bacterial culture

Automatic labeling of liver veins in CT by probabilistic backward tracing

Mine spoil acts as a sink of carbon dioxide in Indian dry tropical environment

Characterization of Trichoderma spp. antagonistic to Phytophthora colocasiae associated with leaf blight of taro

Stereoscopic augmented reality for laparoscopic surgery

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