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 >

Graham Sommer¹, Donna Bouley², Harcharan Gill³, Bruce Daniel¹, Kim Butts Pauly¹, Chris Diederich⁴

Canadian Journal of Urology, Vol.20, No.2, pp. 6672-6681, 2013

Abstract Introduction: There is currently a great deal of interest in the possible use of focal therapies for prostate cancer, since such treatments offer the prospect for control or cure of the primary disease with minimal side effects. Many forms of thermal therapy have been proposed for focal ablation of prostate cancer, including laser, high intensity ultrasound and cryotherapy. This review will demonstrate the important roles that magnetic resonance imaging (MRI) guidance can offer to such focal ablation, focusing on the use of high intensity ultrasonic applicators as an example of one promising technique.
Materials and methods: Transurethral… More >

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 >

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 >

Liviu Marin¹, Henry Power¹, Richard W. Bowtell², Clemente Cobos Sanchez², Adib A. Becker¹, Paul Glover²，Arthur Jones¹

CMES-Computer Modeling in Engineering & Sciences, Vol.23, No.3, pp. 149-174, 2008, DOI:10.3970/cmes.2008.023.149

Abstract We investigate the reconstruction of a divergence-free surface current distribution from knowledge of the magnetic flux density in a prescribed region of interest in the framework of static electromagnetism. This inverse problem is motivated by the design of gradient coils for use in magnetic resonance imaging (MRI) and is formulated using its corresponding integral representation according to potential theory. A novel boundary element method (BEM) which employs linear interpolation on quadratic surfaces and also satisfies the continuity equation for the current density, i.e. a divergence-free BEM, is presented. Since the discretised BEM system is ill-posed More >

Kalyan C. Latchamsetty, Lester S. Borden, Jr, Christopher R. Porter, Marc Lacrampe, Matthew Vaughan, Eugene Lin, Neal Conti, Jonathan L. Wright, John M. Corman

Canadian Journal of Urology, Vol.14, No.1, pp. 3429-3434, 2007

Abstract Introduction: Accurate clinical staging is critical in guiding treatment for patients with prostate adenocarcinoma. Endorectal magnetic resonance imaging (MRI) has been advocated to improve staging accuracy. In order to assess the learning curve for endorectal MRI interpretation, we compared two cohorts of patients with high-risk prostate who underwent endorectal MRI at a center with limited prior exposure to this imaging modality.
Materials and methods: Data for all patients who received a preoperative endorectal MRI followed by radical prostatectomy were prospectively collected. MRI was performed in patients with a high level of suspicion for extracapsular disease based on… More >

Michael L. Pianezza¹, Aiden Mokhtassi², Louis Wu², R. John D’A. Honey¹

Canadian Journal of Urology, Vol.13, No.4, pp. 3204-3207, 2006

Abstract Renal lymphangiectasia is a rare renal condition. We present a case of bilateral renal lymphangiectasia in a 52-year-old man who presented with bilateral flank pain and gross hematuria. The clinical features, diagnosis and characteristic imaging findings are reviewed. This condition should be considered in the differential diagnosis of cystic renal masses in both children and adults. More >