Lijian Xu^1,2, Lekang Yin³, Fuyou Liang^1,2,*

Molecular & Cellular Biomechanics, Vol.16, Suppl.1, pp. 71-72, 2019, DOI:10.32604/mcb.2019.05741

Abstract Recent studies have revealed that aortic valve diseases are associated with the increased incidence of the aortopathy development. However, the influence of aortic valve diseases on aortic hemodynamics remains unclear. The purpose of this study was therefore to investigate the hemodynamic differences in patients with and without aortic valve disease through patient-specific simulations performed on two aorta models (BAV with severe stenosis vs. normal tricuspid aortic valve (TAV)). Realistic geometries and boundary conditions were obtained from computed tomography angiography (CTA) and phase-contrast magnetic resonance imaging (PC-MRI) measurements, respectively. In addition, 4D-MRI were performed to validate More >

Chaoyang Xia¹, Jing Peng¹, Zongqing Ma², Xiaojie Li^1,*

Journal of Information Hiding and Privacy Protection, Vol.1, No.3, pp. 109-117, 2019, DOI:10.32604/jihpp.2019.07198

Abstract Cardiomyopathy is one of the most serious public health threats. The precise structural and functional cardiac measurement is an essential step for clinical diagnosis and follow-up treatment planning. Cardiologists are often required to draw endocardial and epicardial contours of the left ventricle (LV) manually in routine clinical diagnosis or treatment planning period. This task is time-consuming and error-prone. Therefore, it is necessary to develop a fully automated end-to-end semantic segmentation method on cardiac magnetic resonance (CMR) imaging datasets. However, due to the low image quality and the deformation caused by heartbeat, there is no effective… More >

Sultan Noman Qasem^1,2, Amar Nazar³, Attia Qamar⁴, Shahaboddin Shamshirband^5,6,*, Ahmad Karim⁴

CMC-Computers, Materials & Continua, Vol.59, No.3, pp. 713-727, 2019, DOI:10.32604/cmc.2019.05617

Abstract Brain tumor is one of the most dangerous disease that causes due to uncontrollable and abnormal cell partition. In this paper, we have used MRI brain scan in comparison with CT brain scan as it is less harmful to detect brain tumor. We considered watershed segmentation technique for brain tumor detection. The proposed methodology is divided as follows: pre-processing, computing foreground applying watershed, extract and supply features to machine learning algorithms. Consequently, this study is tested on big data set of images and we achieved acceptable accuracy from K-NN classification algorithm in detection of brain More >

Qingyu Wang¹, Dalin Tang^1,2,*, Gador Canton³, Zheyang Wu², Thomas S. Hatsukami⁴, Kristen L. Billiar⁵, Chun Yuan⁶

Molecular & Cellular Biomechanics, Vol.15, No.4, pp. 189-201, 2018, DOI:10.32604/mcb.2018.04572

Abstract Cardiovascular diseases are closely linked to atherosclerotic plaque development and rupture. Assessment of plaque vulnerability is of fundamental significance to cardiovascular research and disease diagnosis, prevention, treatment and management. Magnetic resonance image (MRI) data of carotid atherosclerotic plaques from 8 patients (5 male, 3 female; age: 62-83, mean=71) were acquired at the University of Washington (UW), Seattle by the Vascular Imaging Laboratory (VIL) with written informed consent obtained. Patient-specific vessel material properties were quantified using Cine MRI data for modeling use. 3D thin-layer models were used to obtain plaque stress and strain for plaque assessment.… More >

Magalie Ladouceur^1,2,3, Nadjia Kachenoura⁴, Gilles Soulat^1,3, Emilie Bollache⁴, Alban Redheuil⁴, Michel Azizi³, Christophe Delclaux³, Gilles Chatellier³, Pierre Boutouyrie^1,3, Laurence Iserin³, Damien Bonnet^2,3, Elie Mousseaux^1,3

Congenital Heart Disease, Vol.12, No.4, pp. 458-466, 2017, DOI:10.1111/chd.12472

Abstract Objectives: We aimed (1) determine if systemic right ventricle filling parameters influence systemic right ventricle stroke volume in adult patients with D-transposition of the great arteries (D-TGA) palliated by atrial switch, using cardiac magnetic resonance imaging and echocardiography, and (2) to study relationship of these diastolic parameters with exercise performance and BNP, in patients with preserved systolic systemic right ventricle function.
Design: Single-center, cross-sectional, prospective study.
Setting: In patients with D-TGA palliated by atrial switch, diastolic dysfunction of the systemic right ventricle may precede systolic dysfunction.
Methods: Forty-five patients with D-TGA and atrial switch and 45 age and sex-matched… More >

Hoi Lam She^*, Arno A.W. Roest^†, Emmeline E. Calkoen^†, Pieter J. van den Boogaard^‡, Rob J. van der Geest^‡, Mark G. Hazekamp^§, Albert de Roos^‡, Jos J.M. Westenberg^‡

Congenital Heart Disease, Vol.12, No.1, pp. 40-48, 2017

Abstract Purpose. To evaluate the inflow pattern and flow quantification in patients with functional univentricular heart after Fontan’s operation using 4D flow magnetic resonance imaging (MRI) with streamline visualization when compared with the conventional 2D flow approach.
Method. Seven patients with functional univentricular heart after Fontan’s operation and twenty-three healthy controls underwent 4D flow MRI. In two orthogonal two-chamber planes, streamline visualization was applied, and inflow angles with peak inflow velocity (PIV) were measured. Transatrioventricular flow quantification was assessed using conventional 2D multiplanar reformation (MPR) and 4D MPR tracking the annulus and perpendicular to the streamline inflow at… More >

Muhannad Alsyouf, Mohamed Keheila, Michelle Marinone, Allie Blackburn, Andrea Staack

Canadian Journal of Urology, Vol.23, No.1, pp. 8168-8170, 2016

Abstract Patients undergoing InterStim implantation often have comorbidities, which require magnetic resonance imaging (MRI) for diagnosis. Although MRI of the head has been recently approved for use with the InterStim neurostimulator, imaging of other regions remains controversial. We present a case of Achilles tendinitis diagnosed on MRI of the ankle in a patient with an InterStim device. The neurostimulator was deactivated, and using a transmit/receive extremity coil, the left ankle was imaged without any adverse events. At 9 months post-imaging, the patient continued to have good control of symptoms with InterStim, with no negative effects from More >

Ali-Reza Sharif-Afshar¹, Tom Feng¹, Steven Koopman¹, Christopher Nguyen², Quanlin Li³, Eugene Shkolyar¹, Rola Saouaf², Hyung L. Kim¹

Canadian Journal of Urology, Vol.22, No.2, pp. 7698-7702, 2015

Abstract Introduction: Hemorrhage induced by prostate biopsy can interfere with the interpretation of prostate magnetic resonance imaging (MRI).
Materials and methods: We reviewed 101 patients who had prostate multiparametric MRI (MP-MRI) and radical prostatectomy.
Results: On MRI obtained within 4 weeks following the biopsy, hemorrhage was seen in 26/36 (72.2%) patients. Patients having a MRI between 4-6 weeks of the biopsy had hemorrhage in 8/14 (57.1%) cases. After 6 weeks, hemorrhage was less common but still present in 24/46 (52%) patients. There were five patients who had prostate MRI prior to biopsy and served as a control… More >

Seyed Saeid Dianat¹, H. Ballentine Carter^2,4, Edward M. Schaeffer^2,4, Ulrike M. Hamper^1,2, Jonathan I. Epstein^2,3,4, Katarzyna J. Macura^1,2,4

Canadian Journal of Urology, Vol.22, No.5, pp. 7965-7972, 2015

Abstract Introduction: Purpose of this pilot study was to correlate quantitative parameters derived from the multiparametric magnetic resonance imaging (MP-MRI) of the prostate with results from MRI guided transrectal ultrasound (MRI/TRUS) fusion prostate biopsy in men with suspected prostate cancer.
Materials and methods: Thirty-nine consecutive patients who had 3.0T MP-MRI and subsequent MRI/TRUS fusion prostate biopsy were included and 73 MRI-identified targets were sampled by 177 cores. The pre-biopsy MP-MRI consisted of T2-weighted, diffusion weighted (DWI), and dynamic contrast enhanced (DCE) images. The association of quantitative MRI measurements with biopsy histopathology findings was assessed by Mann-Whitney U-test and… More >

Brian J. Linder¹, Akira Kawashima², David A. Woodrum², Matthew K. Tollefson¹, R. Jeffrey Karnes¹, Brian J. Davis³, Laureano J. Rangel⁴, Bernard F. King², Lance A. Mynderse¹

Canadian Journal of Urology, Vol.21, No.3, pp. 7283-7289, 2014

Abstract Introduction: To evaluate the ability of endorectal coil (e-coil) magnetic resonance imaging (MRI) to identify early prostatic fossa recurrence after radical prostatectomy.
Materials and methods: We identified 187 patients from 2005–2011 who underwent e-coil MRI with dynamic gadolinium-contrast enhancement followed by transrectal ultrasound (TRUS) guided prostatic fossa biopsy for possible local prostate cancer recurrence. For analysis, local recurrence was defined as a negative evaluation for distant metastatic disease with a positive prostatic fossa biopsy, decreased prostate-specific antigen (PSA) following salvage radiation therapy, or increased lesion size on serial imaging.
Results: Local recurrence was identified in 132 patients, with… More >