Jeffrey M. Woldrich, Ronald D. Im, Fiona M. Hughes-Cassidy, Lejla Aganovic, Kyoko Sakamoto

Canadian Journal of Urology, Vol.20, No.4, pp. 6855-6859, 2013

Abstract Introduction: To evaluate magnetic resonance imaging (MRI) utility in intratesticular and extratesticular scrotal diseases.
Materials and methods: Two radiologists retrospectively reviewed images of patients who underwent ultrasound followed by MRI, categorizing them as intratesticular or extratesticular and malignant, benign, indeterminate, or inadequate study. For patients who underwent surgical excision, pathologic results were also correlated to the presurgical ultrasound and MRI diagnoses.
Results: Of 69 cases, 38 were intratesticular lesions and 31 were extratesticular lesions. MRI and ultrasound diagnoses were discordant in 21 (55.32%) intratesticular and 19 (61.3%) extratesticular lesions. MRI diagnosis was malignant after an indeterminate ultrasound in… More >

Rachel A. Moses¹, Lawrence M. Dagrosa¹, Elias S. Hyams¹, Peter L. Steinberg², Vernon M. Pais¹

Canadian Journal of Urology, Vol.20, No.5, pp. 6939-6943, 2013

Abstract Introduction: The purpose of this study is to evaluate predictors of poor compliance after treatment of urinary stone disease.
Materials and methods: This study was a retrospective analysis of patients who underwent stent removal following percutaneous nephrolithotomy (PCNL) or ureteroscopy (URS) between 2008-2012. All patients were scheduled for follow up evaluation and renal ultrasound at 4-6 weeks following stent removal. Patients were stratified based on appointment compliance and demographic variables including gender, age, insurance type (Government Assisted Insurance [GAI] or Private Insurance [PI]), initial procedure, season, distance between home and clinic, average monthly gas price at follow… More >

Benjamin Castaneda^∗, Juvenal Ormachea^†, Paul Rodríguez^‡, Kevin J. Parker^§

Molecular & Cellular Biomechanics, Vol.10, No.1, pp. 43-65, 2013, DOI:10.3970/mcb.2013.010.043

Abstract Elasticity imaging can be understood as the intersection of the study of biomechanical properties, imaging sciences, and physics. It was mainly motivated by the fact that pathological tissue presents an increased stiffness when compared to surrounding normal tissue. In the last two decades, research on elasticity imaging has been an international and interdisciplinary pursuit aiming to map the viscoelastic properties of tissue in order to provide clinically useful information. As a result, several modalities of elasticity imaging, mostly based on ultrasound but also on magnetic resonance imaging and optical coherence tomography, have been proposed and… More >

Roland I. Sing, Rajiv K. Singal

Canadian Journal of Urology, Vol.19, Suppl.5, pp. 36-41, 2012

Abstract Hematuria is a common finding in primary care practice. Causes of significant hematuria include urinary tract infection, urolithiasis, malignancies, benign prostatic hyperplasia, and nephropathies. Hematuria is identified by taking a patient history and by performing a routine urine dipstick test. If a patient has a history of gross hematuria and/or a positive urine dipstick test, he or she should then have a microscopic urinalysis. The primary care physician can order ancillary tests such as laboratory tests to assess renal function, and possible imaging tests such as ultrasound, computed tomography urography, or magnetic resonance urography. The More >

Nicholas A. Boncher¹, Gino J. Vricella¹, Michael Smith², Matthew Passalacqua³, Vikas Gulani², Lee E. Ponsky¹

Canadian Journal of Urology, Vol.19, No.1, pp. 6074-6080, 2012

Abstract Introduction: Contrast-enhanced cross-sectional imaging is essential to the urologist's practice. Traditionally, patients with impaired renal function could not be imaged with a computed tomography (CT) scan with contrast due to the risk of contrast-induced nephropathy (CIN). These patients could alternatively be imaged by magnetic resonance imaging (MRI) with gadolinium. However, the recent identification of the association between nephrogenic systemic fibrosis (NSF) and gadolinium administration has created significant challenges for urologists and radiologists when faced with the need for evaluation with contrast-enhanced cross-sectional imaging. In this review, we summarize the most comprehensive articles discussing both NSF and… More >

V. Sansalone^1,∗, V. Bousson², S. Naili¹, C. Bergot², F. Peyrin³, J.D. Laredo², G. Haïat¹

CMES-Computer Modeling in Engineering & Sciences, Vol.87, No.5, pp. 387-410, 2012, DOI:10.3970/cmes.2012.087.387

Abstract This paper investigates the effects of the heterogeneous distribution of the Haversian Porosity (HP) and Tissue Mineral Density (TMD) on the elastic coefficients of bone in the human femoral neck. A bone specimen from the inferior femoral neck was obtained from a patient undergoing standard hemiarthroplasty. The specimen was imaged using 3-D synchrotron micro-computed tomography (voxel size of 10.13 mm), leading to the determination of the anatomical distributions of HP and TMD. These experimental data were used to estimate the elastic coefficients of the bone using a three-step homogenization model based on continuum micromechanics: (i)… More >

Brad Regez, Sridhar Krishnaswamy, Kirk Kuehling

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 67-68, 2011, DOI:10.3970/icces.2011.020.067

Abstract Dr. Brad Regez

Northwestern University, USA More >

Daniel C. Moura¹, Jorge G. Barbosa¹, Ana M. Reis², João Manuel R. S. Tavares³

CMES-Computer Modeling in Engineering & Sciences, Vol.60, No.2, pp. 115-138, 2010, DOI:10.3970/cmes.2010.060.115

Abstract This paper presents a new method for the calibration of biplanar radiography that makes possible performing 3D reconstructions of the spine using conventional radiological systems. A novel approach is proposed in which a measuring device is used for determining focal distance and have a rough estimation of translation parameters. Using these data, 3D reconstructions of the spine with correct scale were successfully obtained without the need of calibration objects, something that was not previously achieved. For superior results, two optional steps may be executed that involve an optimisation of the geometrical parameters, followed by a… More >

Chein-Shan Liu¹

CMC-Computers, Materials & Continua, Vol.18, No.1, pp. 1-20, 2010, DOI:10.3970/cmc.2010.018.001

Abstract We are concerned with the reconstruction of an unknown space-dependent rigidity coefficient in a wave equation. This problem is known as one of the inverse scattering problems. Based on a two-point Lie-group equation we develop a Lie-group adaptive method (LGAM) to solve this inverse scattering problem through iterations, which possesses a special character that by using onlytwo boundary conditions and two initial conditions, as those used in the direct problem, we can effectively reconstruct the unknown rigidity function by aself-adaption between the local in time differential governing equation and the global in time algebraic Lie-group More >

Brad Regez¹, Sridhar Krishnaswamy¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.4, pp. 111-112, 2009, DOI:10.3970/icces.2009.012.111

Abstract Ultrasonic inspection techniques have a proven record of applications during manufacturing and maintenance of metallic and composite aircraft structures. Traditional ultrasonic inspection techniques use a point-by-point scanning method to acquire a full-field image. This scanning method is slow and inadequate in satisfying modern manufacturing and maintenance time line requirements. The next generation of ultrasonic inspection eliminates the need for point-by-point scanning using an imaging array that is capable of displaying thousands of points to create a full-field image in real-time.
In this study, a next generation dual-channel ultrasonic imaging system is used for real-time three-dimensional evaluation… More >