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  • Open Access


    Canny Edge Detection Model in MRI Image Segmentation Using Optimized Parameter Tuning Method

    Meera Radhakrishnan1,*, Anandan Panneerselvam2, Nandhagopal Nachimuthu3

    Intelligent Automation & Soft Computing, Vol.26, No.6, pp. 1185-1199, 2020, DOI:10.32604/iasc.2020.012069

    Abstract Image segmentation is a crucial stage in the investigation of medical images and is predominantly implemented in various medical applications. In the case of investigating MRI brain images, the image segmentation is mainly employed to measure and visualize the anatomic structure of the brain that underwent modifications to delineate the regions. At present, distinct segmentation approaches with various degrees of accurateness and complexities are available. But, it needs tuning of various parameters to obtain optimal results. The tuning of parameters can be considered as an optimization issue using a similarity function in solution space. This paper presents a new Parametric… More >

  • Open Access


    Influence of Biochar on Nitrogen Use Efficiency and Root Morphology of Rice-Seedling in Two Contrasting Paddy Soils

    Lei Chu1,2, Yu Zhang1,2, Long Qian1,2, Dandan Zhu1,2, Haijun Sun1,2,*

    Phyton-International Journal of Experimental Botany, Vol.89, No.4, pp. 1035-1042, 2020, DOI:10.32604/phyton.2020.014506

    Abstract Biochar may affect the root morphology and nitrogen (N) use efficiency (NUE) of rice at seedling stage, which has not been clearly verified until now. To clarify it, we conducted a pot experiment regarding to two soil types (Hydragric Anthrosol and Haplic Acrisol), two biochar application rates (0.5 wt% and 1.5 wt %) and two rice varieties (common rice var. Xiushui134 and hybrid super rice var. Zhongkejiayou12-6) meanwhile. Seedling NUE of common rice Xiuhui134 was significantly increased (p < 0.05) by 78.2% in Hydragric Anthrosol and by 91.4% in Haplic Acrisol following biochar addition with 1.5 wt%. However, biochar addition… More >

  • Open Access


    Application of Dual Modality Contrast Agent Combined with Multi-Scale Representation in Ultrasound-Magnetic Resonance Imaging Registration Scheme

    Mo Hou1,*, Weiyu Kevin Chiang2,*, Weiqiang Hong1, Maoyun Yang1, Wenhua Yu3,4

    Molecular & Cellular Biomechanics, Vol.17, No.4, pp. 165-178, 2020, DOI:10.32604/mcb.2020.010805

    Abstract To achieve the image registration/fusion and perfect the quality of the integration, with dual modality contrast agent (DMCA), a novel multi-scale representation registration method between ultrasound imaging (US) and magnetic resonance imaging (MRI) is presented in the paper, and how DMCA influence on registration accuracy is chiefly discussed. Owing to US’s intense speckle noise, it is a tremendous challenge to register US with any other modality images. How to improve the algorithms for US processing has become the bottleneck, and in the short term it is difficult to have a breakthrough. In that case, DMCA is employed in both US… More >

  • Open Access


    The Implementation of Optimization Methods for Contrast Enhancement

    Ahmet Elbir1,∗, Hamza Osman Ilhan1, Nizamettin Aydin1

    Computer Systems Science and Engineering, Vol.34, No.2, pp. 101-107, 2019, DOI:10.32604/csse.2019.34.101

    Abstract The performances of the multivariate techniques are directly related to the variable selection process, which is time consuming and requires resources for testing each possible parameter to achieve the best results. Therefore, optimization methods for variable selection process have been proposed in the literature to find the optimal solution in short time by using less system resources. Contrast enhancement is the one of the most important and the parameter dependent image enhancement technique. In this study, two optimization methods are employed for the variable selection for the contrast enhancement technique. Particle swarm optimization (PSO) and artificial bee colony (ABC) optimization… More >

  • Open Access


    Balanced GHM Mutiwavelet Transform Based Contrast Enhancement Technique for Dark Images Using Dynamic Stochastic Resonance

    S. Deivalakshmi*, P. Palanisamy1, X. Z. Gao2

    Intelligent Automation & Soft Computing, Vol.25, No.3, pp. 459-471, 2019, DOI:10.31209/2018.100000001

    Abstract The main aim of this paper is to propose a new technique for enhancing the contrast of dark images using Dynamic Stochastic Resonance (DSR) and Multi Wavelet Transform (MWT), which is computationally more efficient than the conventional methods. In the work, for enhancing the contrast of dark images, the intrinsic noise (darkness) of dark images has been used. The proposed MWT-based DSR scheme (MWT-DSR) can yield better performances in terms of visual information and color preservation than already reported techniques. The desired output response is validated by the Relative Contrast Enhancement Factor (F), Perceptual Quality Measures (PQM) and Color Enhancement… More >

  • Open Access


    Impact of contrast exposure from computed tomography angiography on acute kidney injury after neonatal cardiopulmonary bypass surgery

    Waldemar F. Carlo1, Steven T. Clark2, Santiago Borasino3, Jeffrey A. Alten3

    Congenital Heart Disease, Vol.12, No.4, pp. 540-545, 2017, DOI:10.1111/chd.12482

    Abstract Objective: Acute kidney injury (AKI) is a frequent complication after cardiopulmonary bypass (CBP) for cardiac surgery in neonates. It is unclear if exposure to computed tomography angiography (CTA) in the preoperative period increases the risk of AKI. We hypothesized a short interval between CTA and CPB surgery would be associated with higher rates of AKI in infants.
    Design: In this single center retrospective review of patients between 2012 and 2015, neonates less than one month old were analyzed if they had CTA prior to cardiac surgery with CPB. Baseline, demographic, fluid balance, and laboratory data was analyzed. AKI was staged… More >

  • Open Access


    Exercise testing and spirometry as predictors of mortality in congenital heart disease: Contrasting Fontan physiology with repaired tetralogy of Fallot

    Keri M. Shafer1,2, Alexander R. Opotowsky1,2, Jonathan Rhodes1

    Congenital Heart Disease, Vol.13, No.6, pp. 903-910, 2018, DOI:10.1111/chd.12661

    Abstract Objective: Risk prediction using cardiopulmonary exercise testing (CPET) in complex congenital heart disease tends to either focus on single diagnoses or complete cohorts. We aimed to evaluate patients with two distinct anatomies cared for at a single institution over the same time period to determine CPET variables associated with mortality.
    Design: All Fontan and tetralogy of Fallot (TOF) subjects with CPET between November 1, 2002 and December 31, 2014 and subsequently died were identified (cases). Cases were matched 1:3 to controls with similar age, underlying anatomy and timing of exercise test.
    Results: Of the 42 cases, 27 had a Fontan… More >

  • Open Access


    Evaluation of systemic microvascular reactivity in adults with congenital heart disease

    Pablo Marino1,2, Gabriella de Oliveira Lopes1,3, Juliana Pereira Borges3, Maria Carolina Terra Cola1, Daniel Arkader Kopiler1, Eduardo Tibirica1

    Congenital Heart Disease, Vol.13, No.6, pp. 978-987, 2018, DOI:10.1111/chd.12660

    Abstract Objective: Adults with congenital heart disease share some features with those with chronic heart failure. Although microvascular endothelial dysfunction has been de‐ scribed in chronic heart failure, evaluation of the microcirculation in adults with con‐ genital heart disease is lacking. The present study aimed to investigate systemic microvascular reactivity in adults with congenital heart disease.
    Interventions: The patients initially underwent cardiopulmonary exercise testing. Then, the cutaneous microvascular reactivity was evaluated in these patients using a laser speckle contrast imaging system coupled with skin iontophoresis of endothelial‐de‐ pendent (acetylcholine) or ‐independent (sodium nitroprusside) vasodilators and pos‐ tocclusive reactive hyperemia (PORH) and… More >

  • Open Access


    Kidney injury biomarkers after cardiac angiography in children with congenital heart disease

    Masashi Nishida, Shingo Kubo, Yuma Morishita, Kosuke Nishikawa, Kazuyuki Ikeda, Toshiyuki Itoi, Hajime Hosoi

    Congenital Heart Disease, Vol.14, No.6, pp. 1087-1093, 2019, DOI:10.1111/chd.12853

    Abstract Objective: This study aims to investigate the changes in renal function and levels of urinary biomarkers before and after cardiac angiography in children with congenital heart disease (CHD).
    Setting: Children with CHD are at a risk for kidney injury during contrast exposure in cardiac angiography.
    Outcome Measures: We measured urinary protein, albumin, N‐acetyl‐β‐D‐glucosaminidase (NAG), β2‐microglobulin (BMG), and liver‐type fatty acid‐binding protein (L‐FABP) levels, as well as serum creatinine and cystatin C levels, before and after cardiac angiography in 33 children with CHD.
    Results: No significant decrease was noted in either the creatinine‐based or cystatin C‐based estimated glomerular filtration rate at… More >

  • Open Access


    A General Framework of Reversible Data Hiding with Controlled Contrast Enhancement

    Shaowei Weng1, 2, *, Yiyun Liu1, Yunqing Shi3, Bo Ou4, Chunyu Zhang5, Cuiping Wang6

    CMC-Computers, Materials & Continua, Vol.62, No.1, pp. 157-177, 2020, DOI:10.32604/cmc.2020.05681

    Abstract This paper proposes a two-step general framework for reversible data hiding (RDH) schemes with controllable contrast enhancement. The first step aims at preserving visual perception as much as possible on the basis of achieving high embedding capacity (EC), while the second step is used for increasing image contrast. In the second step, some peak-pairs are utilized so that the histogram of pixel values is modified to perform histogram equalization (HE), which would lead to the image contrast enhancement. However, for HE, the utilization of some peak-pairs easily leads to over-enhanced image contrast when a large number of bits are embedded.… More >

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