Urology -Optical Coherence Tomography News

Articles in category: Urology

1-24 of 161 1 2 3 4 5 6 7 »
1. Intraoperative Imaging Techniques to Support Complete Tumor Resection in Partial Nephrectomy
  
  Explore European Urology Focus May 18 2017 Urology
  
  Context With more complex kidney tumors treated by nephron-sparing surgery (NSS), complete tumor resection is becoming increasingly challenging. Intraoperative imaging may improve the establishment of negative surgical margins. Objective To discuss intraoperative imaging techniques that may help achieve complete tumor resection in NSS of renal tumors. Evidence acquisition PubMed was searched for English articles on intraoperative imaging during NSS of renal cell carcinoma published after 2005, and a reference search of retrieved articles was performed. Evidence synthesis Included studies reported about ultrasonography, fluorescence imaging, augmented reality, optical coherence tomography, and ex vivo magnetic resonance imaging (MRI). The number of patients ...
  Read Full Article
  
  Comment
2. Complementary Study of Collagen State in Bladder Diseases Using Cross-Polarization Optical Coherence Tomography, Nonlinear and Atomic Force Microscopy
  
  Explore Журнал СТМ Apr 18 2017 Urology
  
  The aim of the study is to demonstrate the potential of cross-polarization optical coherence tomography (CP OCT) as a minimally invasive real-time technique for detection of bladder cancer against a background of severe inflammation. Materials and Methods. For the verification of CP OCT diagnostic data related to the condition of collagen comparison with high-resolution microscopy inspection was performed and correlation of the results was calculated. The CP OCT study was performed on samples of tissue with muscle-invasive urothelial carcinoma T 2–3 N 0–х M 0 (G2, 3) in 18 patients ranging in age from 50 to 64 obtained ...
  Read Full Article
  
  Comment
  
  Mentions: Nizhny Novgorod State Medical Academy Institute of Applied Physics Natalia D. Gladkova
3. Georgetown University Receives NIH Grant for Non-Invasive Evaluation f Transplant Kidney using OCT
  
  Explore Optical Coherence Tomography News Apr 4 2017 Urology , Funding
  
  Georgetown University Receives a 2017 NIH Grant for $349,058 for Non-Invasive Evaluation f Transplant Kidney using OCT. The principal investigator is Peter Andrews. The program began in 2014 and ends in 2018. Below is a summary of the proposed work. There is currently a worldwide shortage of kidneys for transplantation due mainly to the fact that there is no reliable means to determine their viability (i.e., kidneys stored for long periods of time, etc.). Also, following transplantation, kidneys oftn do not function immediately and their status is unclear. Previously, we have shown that the histopathology of living, superficial ...
  Read Full Article
  
  Comment
  
  Mentions: National Institutes of Health Georgetown University
4. Can we improve transurethral resection of the bladder tumour for nonmuscle invasive bladder cancer?
  
  Explore LWW Online Mar 1 2017 Oncology , Urology
  
  Purpose of review: The recurrence rate in patients with nonmuscle invasive bladder cancer is high, and the quality of transurethral resection of the bladder (TURB) tumour influences recurrence risk. We review new methods that aim to improve the effectiveness of TURB, and highlight studies of the past year. Recent findings: Several approaches have been explored: bipolar resection is well tolerated and efficient; however, surgical outcomes are not clearly superior to monopolar resection; en-bloc resection seems feasible and well tolerated, and has the potential to improve the quality of tissue for histopathology; enhancement techniques such as photodynamic diagnosis, narrow band imaging ...
  Read Full Article
  
  Comment
  
  Mentions: Theo M. de Reijke
5. Quality control and primo-diagnosis of transurethral bladder resections with full-field OCT
  
  Explore Conference Proceedings Feb 16 2017 Urology
  
  Transurethral resections are commonly used for bladder cancer diagnosis, treatment and follow-up. Cancer staging relies largely on the analysis of muscle in the resections; however, muscle presence is uncertain at the time of the resection. An extemporaneous quality control tool would be of great use to certify the presence of muscle in the resection, and potentially formulate a primo-diagnosis, in order to ensure optimum patient care. Full-field optical coherence tomography (FFOCT) offers a fast and non-destructive method of obtaining images of biological tissues at ultrahigh resolution (1μm in all 3 directions), approaching traditional histological sections. This study aimed to ...
  Read Full Article
  
  Comment
  
  Mentions: LLTech Eugénie Dalimier
6. New technologies for upper tract urothelial carcinoma management
  
  Explore LWW Online Jan 27 2017 Oncology , Urology
  
  Purpose of review: Image enhancement techniques and optical diagnostic tools have emerged in the quest to improve diagnostics and treatment in patients with upper urinary tract carcinoma (UTUC). The aim of the present report is to describe their mechanisms of action and to assess the current evidence on applicability and utility in UTUC. Recent findings: Image enhancement techniques including narrow band imaging, Image1 S, and photodynamic diagnosis aim at better visualization of malignant urothelium and especially flat tumours or carcinoma in situ which are often difficult to see with white light endoscopy. Conducted studies in the upper tract are scarce ...
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Jean J. M. C. H. de la Rosette
7. Renal fluid overload diagnosed by retinal optical coherence tomography scanning
  
  Explore sjkdt.org Dec 3 2016 Ophthalmology , Urology
  
  Fluid overload is one of the major findings in patients with end-stage renal disease. Common findings in fluid overload include shortness of breath, pedal edema, ascites, and pericardial effusion. Rarely, vision loss can be associated with decompensated systemic fluid status. In the following case, we report an unusual case of vision loss due to retinal edema as a result of fluid overload diagnosed and followed to resolution by optical coherence tomography testing.
  Read Full Article
  
  Comment
8. LLTECH Records Major Progress In Prostate Cancer Detection And Diagnosis On Use Its Cellular-Scale Imaging Solution
  
  Explore Optical Coherence Tomography News Oct 13 2016 Urology , Other Business News
  
  LLTech, an imaging company specialized in the field of the real-time optical biopsy for the diagnosis and the assessment of cancer surgery, announces today the publication of a new study demonstrating the potential of its Full-field optical coherence tomography (FFOCT) technology in the pre-histological detection of prostate cancer. During a study led to the Beijing Hospital of Health Ministry (Beijing, China), Cochin Hospital (Paris, France) and UCLA (Los Angeles, USA), three readers (a pathologist with previous experience with FFOCT, a pathologist new to FFOCT, and a urologist new to FFOCT) were trained to read FFOCT images of prostate biopsies (a ...
  Read Full Article
  
  Comment
  
  Mentions: UCLA LLTech Bertrand de Poly
9. Multi-modality Optical Imaging of Rat Kidney Dysfunction: In Vivo Response to Various Ischemia Times
  
  Explore Home - Springer Aug 16 2016 Developmental Biology , Urology
  
  We observed in vivo kidney dysfunction with various ischemia times at 30, 75, 90, and 120 min using multi-modality optical imaging: optical coherence tomography (OCT), Doppler OCT (DOCT), and two-photon microscopy (TPM). We imaged the renal tubule lumens and glomerulus at several areas of each kidney before, during, and after ischemia of 5-month-old female Munich-Wistar rats. For animals with 30 and 75 min ischemia times, we observed that all areas were recovered after ischemia, that tubule lumens were re-opened and the blood flow of the glomerulus was re-established. For animals with 90 and 120 min ischemia times, we observed unrecovered ...
  Read Full Article
  
  Comment
  
  Mentions: University of Maryland Yu Chen Tianjin University
10. Optical Coherence Tomography as a Tool for in Vivo Staging and Grading of Upper Urinary Tract Urothelial Carcinoma: A Study for Diagnostic Accuracy
  
  Explore Elsevier Health Jul 29 2016 Urology
  
  Purposes Biopsies and cytology are cornerstones in the diagnosis of upper urinary tract urothelial carcinoma (UTUC). However, a high rate of non-diagnostic biopsies, tumor upgrading and -staging after nephroureterectomy is observed. In this prospective in vivo study we aimed to evaluate the diagnostic accuracy of OCT for grading and staging of UTUC Material & Methods Twenty-six patients underwent diagnostic URS including biopsies and OCT imaging, followed by nephroureterectomy or segmental ureter resection. Sensitivity, specificity, negative predictive value and positive predictive value of UTUC grading and staging by OCT were evaluated according to the STARD initiative and second stage (2a and 2b ...
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber Ton G. van Leeuwen
11. Impact of chronic kidney disease stages on atherosclerotic plaque components on optical coherence tomography in patients with coronary artery disease
  
  Explore Home - Springer Jun 25 2016 Cardiology , Urology
  
  The progression of coronary atherosclerosis has been influenced by the presence of chronic kidney disease (CKD). This study investigated the impact of CKD stages on coronary plaque components observed on optical coherence tomography (OCT). We investigated 296 native coronary lesions with stable angina pectoris treated with stent implantation. All lesions were divided into the three groups according to the values of estimated glomerular filtration rate (eGFR, mL min −1 1.73 m −2 ): the non-CKD group (eGFR ≥60, n = 142), CKD group (15 ≤ eGFR < 60, n = 126), and end-stage kidney disease (ESKD) group (eGFR <15 and/or hemodialysis, n = 28 ...
  Read Full Article
  
  Comment
  
  Mentions: Tokyo Medical & Dental University Keiichi Hishikari
12. High efficiency for prostate biopsy qualification with full-field OCT after training
  
  Explore Conference Proceedings Jun 13 2016 Oncology , Urology
  
  Full-field optical coherence tomography (FFOCT) offers a fast and non-destructive method of obtaining images of biological tissues at ultrahigh resolution, approaching traditional histological sections. In the context of prostate cancer diagnosis involving multiple biopsies, FFOCT could be used to validate the cores just after they are obtained in order to guide the number of biopsies to be performed. The aim of the study was to define and test a training protocol for efficient FFOCT prostate biopsy assessment. Three readers (a pathologist with previous experience with FFOCT, a pathologist new to FFOCT, and a urologist new to FFOCT) were trained to ...
  Read Full Article
  
  Comment
  
  Mentions: UCLA LLTech Eugénie Dalimier
13. Optical Coherence Tomography of the Aging Kidney
  
  Explore ectrx.org May 5 2016 Urology
  
  Objectives: The aging kidney exhibits a progressive decline in renal function with characteristic histopathologic changes and is a risk factor for renal transplant. However, the degree to which the kidney exhibits this decline depends on several factors that vary from one individual to the next. Optical coherence tomography is an evolving noninvasive imaging technology that has recently been used to evaluate acute tubular necrosis of living-human donor kidneys before their transplant. With the increasing use of kidneys from older individuals, it is important to determine whether optical coherence tomography also can distinguish the histopathology associated with aging. Materials and Methods ...
  Read Full Article
  
  Comment
  
  Mentions: University of Maryland Yu Chen
14. Combined optical coherence tomography and optical coherence elastography for glomerulonephritis classification
  
  Explore Conference Proceedings Mar 13 2016 Urology
  
  Acute Glomerulonephritis caused by anti-glomerular basement membrane disease has a high mortality due to delayed diagnosis. Thus, an accurate and early diagnosis is critical for preserving renal function. Currently, blood, urine, and tissue-based diagnoses can be time consuming, while ultrasound and CT imaging have relatively low spatial resolution. Optical coherence tomography (OCT) is a noninvasive imaging technique that provides superior spatial resolution (micron scale) as compared to ultrasound and CT. Pathological changes in tissue properties can be detected based on the optical metrics analyzed from the OCT signal, such as optical attenuation and speckle variance. Moreover, OCT does not rely ...
  Read Full Article
  
  Comment
  
  Mentions: University of Chicago Kirill V. Larin University of Houston
15. Catheter-based intraluminal optical coherence tomography of the normal human upper urinary tract in vivo: proof of concept and comparison with an ex-vivo porcine model
  
  Explore Home - Bladder Journal Feb 24 2016 Urology
  
  Objective : Single-slice, cross-sectional, intraluminal optical-coherence-tomography (OCT) is a new destruction-free optical imaging method that could be applied clinically to examine the upper urinary tract from within. In-vivo access to the human upper urinary tract (UUT) was attempted. Similar performance statistics as in ex-vivo porcine UUT were expected for delineation of different wall layers by in-vivo OCT of human UUTs. MATERIALS AND METHODS : Institutional ethics committee approved OCT in a volunteer sample of 15 patients suspected of having UUT pathology (urolithiasis, strictures, urothelial carcinoma (UC)). Commercially available, catheter-mounted 400-μm-OCT-probes (lateral resolution, < 20 µm) were introduced through a rigid cystoscope and ...
  Read Full Article
  
  Comment
  
  Mentions: Technical University of Munich
16. Prostate cancer diagnosis by optical coherence tomography: First results from a needle based optical platform for tissue sampling
  
  Explore Wiley Online Library Feb 9 2016 Oncology , Urology
  
  The diagnostic accuracy of Optical Coherence Tomography (OCT) based optical attenuation coefficient analysis is assessed for the detection of prostate cancer. Needle-based OCT-measurements were performed on the prostate specimens. Attenuation coefficients were determined by an earlier described in-house developed software package. The mean attenuation coefficients (benign OCT data; malignant OCT data; p-value Mann-Whitney U test) were: (3.56 mm –1 ; 3.85 mm –1 ; p < 0.0001) for all patients combined. The area under the ROC curve was 0.64. In order to circumvent the effect of histopathology mismatching, we performed a sub-analysis on only OCT data in which tumor ...
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber VU University Amsterdam
17. Customized Tool for the Validation of Optical Coherence Tomography in Differentiation of Prostate Cancer
  
  Explore tct.sagepub.com Jan 28 2016 Urology
  
  Objective: To design and demonstrate a customized tool to generate histologic sections of the prostate that directly correlate with needle-based optical coherence tomography pullback measurements. Materials and Methods: A customized tool was created to hold the prostatectomy specimens during optical coherence tomography measurements and formalin fixation. Using the tool, the prostate could be sliced into slices of 4 mm thickness through the optical coherence tomography measurement trajectory. In this way, whole-mount pathology slides were produced in exactly the same location as the optical coherence tomography measurements were performed. Full 3-dimensional optical coherence tomography pullbacks were fused with the histopathology slides ...
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber VU University Amsterdam
18. Percutaneous Needle Based Optical Coherence Tomography for the Differentiation of Renal Masses: a Pilot Cohort
  
  Explore The Journal of Urology Dec 22 2015 Urology
  
  To view the full text, please login as a subscribed user or purchase a subscription . Click here to view the full text on ScienceDirect. The aim of this study is to determine the ability of percutaneous needle based Optical Coherence Tomography (OCT) to differentiate renal masses, by using the attenuation coefficient (μOCT, mm-1) as a quantitative measure. Percutaneous needle based OCT of the kidney was performed in patients presenting with a solid renal mass.
  Read Full Article
  
  Comment
  
  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber Ton G. van Leeuwen
19. Optical coherence tomography-guided percutaneous coronary intervention in pre-terminal chronic kidney disease with no radio-contrast administration
  
  Explore Oxford Journals Dec 21 2015 Cardiology , Urology
  
  A 67-year-old man with advanced chronic kidney disease (CKD) (creatinine = 4.5 mg/dL, eGFR = 13 mL/min/1.73 m 2 ) not requiring haemodialysis presented with progressive angina. Diagnostic angiography with ultra-low radio-contrast volume (12 mL, contrast volume/eGFR ratio <1) revealed significant stenosis in the left anterior descending (LAD) artery ( Panel A ). The lesion was haemodynamically significant (fractional flow reserve: 0.77). Post-angiography, the …
  Read Full Article
  
  Comment
  
  Mentions: Cardiovascular Research Foundation University of Sydney Martin B. Leon
20. Diagnostics techniques in nonmuscle invasive bladder cancer
  
  Explore Indian Journal of Urology (IJU) Nov 29 2015 Urology
  
  Introduction: Nonmuscle invasive bladder cancer (NMIBC) is the most common presentation of bladder cancer and is often treatable with endoscopic resection and intravesical therapies. Cystoscopy and urine cytology are the gold standard in diagnosis and surveillance but are limited by their sensitivity in some situations. We seek to provide an overview of recent additions to the diagnostic armamentarium for urologists treating this disease. Methods: Articles were identified through a literature review of articles obtained through PubMed searches including the terms “bladder cancer”and various diagnostic techniques described in the article. Results: A variety of urinary biomarkers are available to assist ...
  Read Full Article
  
  Comment
  
  Mentions: University of Minnesota
21. A Pilot Study of In Vivo Confocal Laser Endomicroscopy of Upper Tract Urothelial Carcinoma
  
  Explore Mary Ann Liebert, Inc. publishers Oct 3 2015 Urology
  
  Purpose: Tissue diagnosis of upper tract urothelial carcinoma (UTUC) is limited by variance in tumor sampling by standard ureteroscopic biopsy. Optical imaging technologies can potentially improve UTUC diagnosis, surveillance, and endoscopic treatment. We previously demonstrated in vivo optical biopsy of urothelial carcinoma of the bladder using confocal laser endomicroscopy (CLE). In this study, we evaluated a new 0.85-mm imaging probe in the upper urinary tract and demonstrated feasibility and compatibility with standard ureteroscopes to achieve in vivo optical biopsy of UTUC. Patients, Materials and Methods: Fourteen patients scheduled for ureteroscopy of suspected upper tract lesions or surveillance of UTUC ...
  Read Full Article
  
  Comment
  
  Mentions: Stanford University
22. Apparatus And Methods For NON-INVASIVE Assessment Of Transplant Kidney Viability
  
  Explore patentscope.wipo.int Jul 24 2015 Urology , Patents
  
  A kidney viability assessment system (KVAS) is disclosed which provides objective and reliable tests to assess the viability of transplant or donor kidneys in vivo and predict their post-transplant outcomes. KVAS includes an optical device augmented by an intelligent algorithm that can evaluate the viability or quality of the donor kidney in a real-time, non-invasive way. In particular, it includes a handheld optical coherence tomography (OCT) imaging device and at least one processor configured for executing a set of instructions corresponding to an automatic image processing algorithm for quantification of kidney microstructures and functions. Handheld OCT can survey the entire ...
  Read Full Article
  
  Comment
  
  Mentions: University of Maryland Yu Chen Jeremiah Wierwille
23. Prostate cancer diagnosis: the feasibility of needle-based optical coherence tomography
  
  Explore SPIE | Journal Jul 14 2015 Urology
  
  The objective of this study is to demonstrate the feasibility of needle-based optical coherence tomography (OCT) and functional analysis of OCT data along the full pullback trajectory of the OCT measurement in the prostate, correlated with pathology. OCT images were recorded using a commercially available C7-XR™ OCT Intravascular Imaging System interfaced to a C7 Dragonfly™ intravascular 0.9-mm-diameter imaging probe. A computer program was constructed for automated image attenuation analysis. First, calibration of the OCT system for both the point spread function and the system roll-off was achieved by measurement of the OCT signal attenuation from an extremely weakly scattering ...
  Read Full Article
  
  Comment
  
  Mentions: Dirk J. Faber Ton G. van Leeuwen Lightlab C7 XR OCT Imaging System
24. Catheter-based intraluminal optical coherence tomography: mcomparison with digital light microscopy of ureter wall morphometry in porcine specimens
  
  Explore Home - Bladder Journal Jul 11 2015 Urology
  
  OBJECTIVE: Reproducibility and agreement of width estimates for urothelium, lamina propria, and muscle layer of normal porcine ureter wall ex vivo were compared between catheter-mounted, intraluminal cross-sectional optical coherence tomography (OCT), as a new destruction-free optical imaging method that could be applied clinically to examine the upper urinary tract from within if found to reliably delineate its different anatomical layers, and whole-mount low-power digital light microscopy (DLM). MATERIALS AND METHODS: Eleven ex-vivo-specimens of porcine ureter were flushed with normal saline solution prior to OCT (catheter diameter, 0.014 inch, wavelength, 1300 ± 20 nm, LightLab Imaging, Inc., Westford, MA, USA) at ...
  Read Full Article
  
  Comment
  
  Mentions: St. Jude Medical
1-24 of 161 1 2 3 4 5 6 7 »