Urology -Optical Coherence Tomography News

Articles in category: Urology

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1. Mannitol Infusion Within 15 Min of Cross-Clamp Improves Living Donor Kidney Preservation
  
  Explore LWW Online May 17 2014 Urology
  
  BACKGROUND: Optical coherence tomography (OCT) revealed that cells lining proximal convoluted tubules of living donor kidneys (LDKs) procured by laparoscopic procedures were very swollen in response to the brief period of ischemia experienced between the time of arterial vessel clamping and flushing the excised kidney with cold preservation solution. Damage to the tubules as a result of this cell swelling resulted in varying degrees of acute tubular necrosis (ATN) that slowed the recovery of the donor kidneys during the first 2 weeks after their transplantation. METHODS: To prevent this cell damage during LDK procurement, we changed the protocol for intravenous ...
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  Mentions: University of Maryland Yu Chen
2. Optical Coherence Tomography (OCT) in Hypertension & Chronic Kidney Disease (CKD)
  
  Explore ClinicalTrials.gov Apr 29 2014 Urology , Clinical Trials
  
  Patients with high blood pressure (hypertension) and chronic kidney disease are at an increased risk of developing heart disease and strokes. Part of this risk is due to changes in the structure and function of the blood vessels throughout the body. It is thought that reducing high blood pressure and treating chronic kidney disease improves the structure and function of blood vessels but information on this is limited. Optical coherence tomography (OCT) is a method of looking at the blood vessels at the back of the eye. It is a simple, quick and non-invasive test that you may have previously ...
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3. Georgetown University Receives NIH Grant for Non-Invasive Evaluation of Transplant Kidney Using OCT
  
  Explore Optical Coherence Tomography News Apr 10 2014 Urology , Funding , Velocimetry
  
  Georgetown University Received at 2014 NIH Grant for $520,754 for Non-Invasive Evaluation of Transplant Kidney Using OCT. The principal investigator is Peter Michael Andrewss. 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 ...
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  Mentions: National Institutes of Health Georgetown University
4. Optical Coherence Tomography in Staging Patients With Upper Tract Urothelial Cancer
  
  Explore ClinicalTrials.gov Apr 7 2014 Oncology , Urology , Clinical Trials
  
  This clinical trial studies how well optical coherence tomography works in staging patients with upper-tract urothelial carcinomas. Staging describes the severity of a person's cancer based on the size and/or extent (reach) of the original (primary) tumor and whether or not cancer has spread in the body. It also helps the doctor plan the appropriate treatment. Optical coherence tomography is a procedure that uses infrared light waves to give three-dimensional pictures of structures inside tissues and organs. The pictures are made by a computer linked to the light source. Optical coherence tomography may be effective in staging patients ...
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  Mentions: National Cancer Institute
5. Emerging endoscopic imaging technologies for bladder cancer detection
  
  Explore Home - Springer Mar 31 2014 Urology
  
  Modern urologic endoscopy is the result of continuous innovations since the early nineteenth century. White-light cystoscopy is the primary strategy for identification, resection, and local staging of bladder cancer. While highly effective, white light cystoscopy has several well-recognized shortcomings. Recent advances in optical imaging technologies and device miniaturization hold the potential to improve bladder cancer diagnosis and resection. Photodynamic diagnosis and narrow band imaging are the first to enter the clinical arena. Confocal laser endomicroscopy, optical coherence tomography, Raman spectroscopy, UV autofluorescence, and others have shown promising clinical and pre-clinical feasibility. We review their mechanisms of action, highlight their respective ...
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  Mentions: Stanford University
6. Clinical applications of functional optical coherence tomography (Thesis)
  
  Explore UvA DARE Mar 19 2014 Gynecology , Urology , Student Theses
  
  The purpose of the work presented in this thesis is to show the potential of functional optical coherence tomography (OCT) to discriminate pathological from normal tissues in several clinical settings, by means of the attenuation coefficient. To that end, several fundamental studies were carried out to increase the fundamental understanding of the measured signals (in phantoms, during apoptosis) and both ex and in vivo investigations are performed in the urological and gynecological clinic.
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  Mentions: Dirk J. Faber Frank D. Verbraak Ton G. van Leeuwen
7. Three-dimensional, distendable bladder phantom for optical coherence tomography and white light cystoscopy
  
  Explore SPIE | Journal Mar 14 2014 Oncology , Urology
  
  We describe a combination of fabrication techniques and a general process to construct a three-dimensional (3-D) phantom that mimics the size, macroscale structure, microscale surface topology, subsurface microstructure, optical properties, and functional characteristics of a cancerous bladder. The phantom also includes features that are recognizable in white light (i.e., the visual appearance of blood vessels), making it suitable to emulate the bladder for emerging white light + optical coherence tomography (OCT) cystoscopies and other endoscopic procedures of large, irregularly shaped organs. The fabrication process has broad applicability and can be generalized to OCT phantoms for other tissue types or phantoms ...
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  Mentions: Stanford University Audrey K. Ellerbee
8. Volumetric mosaicing for optical coherence tomography for large area bladder wall visualization
  
  Explore Conference Proceedings Mar 8 2014 Urology
  
  Optical coherence tomography (OCT) has shown potential as a complementary imaging modality to white light cystoscopy (WLC) because it can visualize sub-surface details of the bladder wall, enabling it to stage early cancers and visualize tumors undetectable to WLC. However, the inherently small field of view (FOV) of OCT compared with the area of the bladder wall restricts its clinical utility. A large OCT FOV could improve surgical planning by enabling complete visualization of tumor margins or could aid in early cancer detection by tracking the appearance of the bladder wall over time. To overcome the limited FOV of OCT ...
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  Mentions: Stanford University Audrey K. Ellerbee
9. Multilayered disease-mimicking bladder phantom with realistic surface topology for optical coherence tomography
  
  Explore Conference Proceedings Mar 8 2014 Urology
  
  Optical coherence tomography (OCT) has shown potential as a complementary modality to white light cystoscopy (WLC), the gold standard for imaging bladder cancer. OCT can visualize sub-surface details of the bladder wall, which enables it to stage cancers and detect tumors that are otherwise invisible to WLC. Currently, OCT systems have too slow a speed and too small a field of view for comprehensive bladder imaging, which limits its clinical utility. Validation and feasibility testing of technological refinements aimed to provide faster imaging and wider fields of view necessitates a realistic bladder phantom. We present a novel process to fabricate ...
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  Mentions: Stanford University Audrey K. Ellerbee Joseph Liao
10. Non-Invasive Evaluation of Transplant Kidney Using OCT
  
  Explore ClinicalTrials.gov Mar 6 2014 Urology , Clinical Trials
  
  Optical coherence tomography (OCT) is a rapidly emerging imaging modality that can function as a type of "optical biopsy", providing non-invasive cross-sectional images of tissue architectural morphology in situ and in real-time. This proposal will demonstrate that OCT has the ability to provide novel and valuable histopathological information regarding donor kidneys that can be used to predict post-transplant renal function. These investigations will result in a major breakthrough in increasing the number of healthy kidneys available for transplantation by making the most efficient use of available donor kidneys, eliminating the possible use of bad donor kidneys, providing an accurate measure ...
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  Mentions: Georgetown University
11. Optical coherence tomography provides images similar to histology and allows the performance of extensive measurements of drug-eluting metal stents in animal ureter
  
  Explore Home - Springer Mar 5 2014 Urology
  
  Optical coherence tomography (OCT) images and histology images of metal stents (MSs) inserted in animal ureters were compared, and the reliability of an OCT-based automated method for the performance of quantitative evaluation of ureteral MSs was evaluated. A zotarolimus-eluting metal stent (ZES) and a bare metal stent (BMS) were inserted in each ureter of ten pigs and six rabbits. OCT was performed in unobstructed stented ureters. Histopathologic examination of the stented ureters embedded in glycol-methacrylate took place. Quadrants of OCT images were compared to their respective histologic images by employing two independent observers who delineated different layers in the quadrants ...
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  Mentions: Imalux Niris Patras University
12. Using Optical Coherence Tomography (OCT) to Evaluate Human Donor Kidneys Prior to and Following Transplantation
  
  Explore OMICS Group Mar 1 2014 Urology
  
  The most common insult to donor kidneys destined for transplantation is Acute Tubular Necrosis (ATN). The extent of ATN will affect post-transplant function and is a significant risk factor for long-term graft function and survival. Optical Coherence Tomography (OCT) is a rapidly emerging imaging modality that can function as a type of “optical biopsy”, providing non-invasive images of tissue morphology in situ and in real-time. In this paper, we review studies that support the use of OCT and Doppler based OCT (i.e., DOCT) to image the renal microstructure and blood flow of human donor kidneys. We conclude that OCT ...
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  Mentions: University of Maryland Yu Chen
13. Optical coherence tomography diagnostics for onco–urology. Review of clinical perspectives
  
  Explore Termedia Mar 1 2014 Urology
  
  Introduction. Optical coherence tomography (OCT) is being investigated widely for use in urologic pathology. The current imaging of urogenital cancers cannot be perfect, thus, routine methods demands new updates or inventions of alternative radiological scope. OCT presents so–called “live” optical biopsy. The authors aim to review this modality for uro–oncological purposes. Matherial and methods. A series of 37 publications between 1989 and 2012 was selected and cited from GoogleScholar and PubMED/MEDLINE. The urogenital tract (bladder, ureter, scrotum organs and prostate) was imaged by OCT. Results. The overall OCT sensitivity, specificity, accuracy, negative and positive predictive values ranged ...
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  Mentions: Maciej Wojtkowski Nicolaus Copernicus University
14. From industrial laboratory directly to operating table: the vicissitudes of optical coherence tomography (OCT)
  
  Explore Termedia Mar 1 2014 Urology
  
  The current issue of the CEJU runs a paper presenting the prospect of an amazing, unconventional diagnostic method. Optical coherence tomography (OCT) is a relatively new interferometric technique of optical imaging [1]. Though physical foundations of OCT are difficult to grasp for a run–of–the–mill kind of CEJU reader (editor alike), Dr. S. Kharchenko and co–workers’ paper deserves our notice. This technique has been developed in the Massachusetts Institute of Technology twenty years ago and now OCT emerges as a powerful supplementary tool for uro–oncology. We can be really moved by amazing 3–D scans of ...
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  Mentions: Massachusetts Institute of Technology
15. Optical Coherence Tomography of the Living Human Kidney
  
  Explore Home (World Scientific) Jan 17 2014 Urology
  
  Acute tubular necrosis (ATN) induced by ischemia is the most common insult to donor kidneys destined for transplantation. ATN results from swelling and subsequent damage to cells lining the kidney tubules. In this study, we demonstrate the capability of optical coherence tomography (OCT) to image the renal microstructures of living human donor kidneys and potentially provide a measure to determine the extent of ATN. We also found that Doppler-based OCT (i.e., DOCT) reveals renal blood flow dynamics that is another major factor which could relate to post-transplant renal function. All OCT/DOCT observations were performed in a noninvasive, sterile ...
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  Mentions: University of Maryland Yu Chen Fujian Normal University
16. Full field optical coherence tomography of prostate biopsies: A step towards pre-histological diagnosis?
  
  Explore ScienceDirect Dec 31 2013 Oncology , Urology
  
  Objectives To evaluate the value of full field optical coherence tomography (FFOCT) for cancer detection on prostate biopsies Patients and methods Eight consecutive patients who underwent prostate biopsies for an elevated PSA or suspicious DRE findings were included in the study. For each patient, one to three biopsy cores were imaged with FFOCT immediately after sampling. Images obtained were analyzed by a pathologist blinded to the pathological results, and classified into three categories: non-cancerous tissue, suspicion of malignancy and prostate carcinoma. A pathological correlation analysis was further performed. Results Sixteen biopsy cores were analyzed. The median FFOCT procedure time was ...
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17. The impact of real-time 3d imaging by ultra-high speed optical coherence tomography in urothelial carcinoma
  
  Explore BioMed Central Dec 3 2013 Urology
  
  Optical coherence tomography (OCT) has become a promising diagnostic tool in many medical fields. In particular, noninvasive real-time optical biopsy of internal organs is one of the most attractive applications of OCT, enabling in situ diagnosis of carcinoma at an early stage. We used an ultra-high speed OCT system for real-time three-dimensional (3D) imaging of three excised specimens of advanced urothelial carcinoma (UC) and investigated the association of the images with results from histopathological examination. Case presentations: Case 1 was a 69-year-old man underwent radical cystectomy for muscle-invasive UC (pT2). Case 2 was a 53-year-old man underwent laparoscopic nephroureterectomy and ...
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  Mentions: Kohji Ohbayashi
18. Intraoperative optical imaging and tissue interrogation during urologic surgery
  
  Explore LWW Online Nov 19 2013 Urology
  
  Purpose of review: To review optical imaging technologies in urologic surgery aimed to facilitate intraoperative imaging and tissue interrogation. Recent findings: Emerging new optical imaging technologies can be integrated in the operating room environment during minimally invasive and open surgery. These technologies include macroscopic fluorescence imaging that provides contrast enhancement between normal and diseased tissue and microscopic imaging that provides tissue characterization. Summary: Optical imaging technologies that have reached the clinical arena in urologic surgery were reviewed, including photodynamic diagnosis, near infrared fluorescence imaging, optical coherence tomography, and confocal laser endomicroscopy.
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  Mentions: Johns Hopkins University Li-Ming Su
19. Feature Of The Week 11/10/13: Volumetric In-Vivo Visualization of Upper Urinary Tract Tumors Using Optical Coherence Tomography: A Pilot Study
  
  Explore Optical Coherence Tomography News Nov 10 2013 Oncology , Urology
  
  Optical Coherence Tomography (OCT) has proven a powerful tool for ophthalmologists to make clinical decisions for a wide range of blinding diseases and the there are now ~20 million ophthalmic OCT patient scans per year. Significant progress is also being made in intravascular imaging where OCT is emerging as a tool for both clinical decision making and the understanding of cardiovascular disease and development of new therapeutic tools. OCT also has the potential to impact the understanding, diagnosis, and treatment of some forms of cancer. There are many leading research groups around the world that are making excellent progress in ...
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  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber Ton G. van Leeuwen
20. Case Western Reserve University Receives NIH Grant for Staging of Upper Tract Urothelial Cancer with Optical Coherence Tomography
  
  Explore Optical Coherence Tomography News Sep 17 2013 Urology , Funding
  
  Case Western Reserve University Receive at 2013 NIH Grant for $244,983 for Staging of Upper Tract Urothelial Cancer with Optical Coherence Tomography. The principal investigator is Andrew Rollins. The program began in 2012 and ends in 2014. Below is a summary of the proposed work.
  
  Diagnosis and treatment of upper-tract urothelial carcinomas (UTUC) remain very challenging for urologists. Standard management for many years has been radical nephroureterectomy (RNU). However, RNU is a significant over-treatment for low-risk tumors, which have low rate of progression. Endoscopic management of these low-risk cases bears obvious advantages over RNU, including lower co-morbidity and lower ...
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  Mentions: Andrew M. Rollins National Institutes of Health Case Western Reserve University
21. Innovations in the endoscopic management of bladder cancer: is the era of white light cystoscopy over
  
  Explore rivistaurologia.it Sep 15 2013 Urology
  
  Bladder cancer is the most common tumor of the urinary tract, with a worldwide incidence of 8.6 x 100000 in men and 2.6 x 100000 in women (1). The majority of patients (75-85%) present as non-muscle invasive bladder cancer (NMIBC); within this category the most represented stage is Ta (70%), followed by T1 (20%) and, less frequently, carcinoma in situ (CIS) (10%) (2). The diagnosis of NMIBC and, more generally, of bladder cancer, depends on urine cytology and endoscopic examination with histological evaluation of the resected tissue. Clearly, an optimal cystoscopy with accurate transurethral resection (TUR) is of ...
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22. University of Maryland Receives NIH Grant for Age-Related Changes in Renal Morphology and Function in Chronic Kidney Disease
  
  Explore Optical Coherence Tomography News Sep 11 2013 Urology , Funding
  
  University of Maryland Received a 2013 NIH Grant for $219,084 for Age-Related Changes in Renal Morphology and Function in Chronic Kidney Disease. The principal investigator is Yu Chen. The program begain in 2012 and ends in 2014. Below is a summary of the proposed work. This application is in response to PA-09-166 "Renal Function and Chronic Kidney Disease (CKD) in Aging (R21)". CKD is a growing problem among the aging population. According to the United States Renal Data System, the number of older patients with end-stage renal disease (ESRD) has almost doubled over the last 25 years. Thus, CKD ...
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  Mentions: University of Maryland National Institutes of Health Yu Chen
23. Volumetric In-Vivo Visualization of Upper Urinary Tract Tumors Using Optical Coherence Tomography: A Pilot Study
  
  Explore The Journal of Urology Aug 18 2013 Urology
  
  Purpose Knowledge on tumor stage and grade is paramount for treatment decision in Upper Urinary Tract Urothelial Carcinoma (UUT-UC), but cannot be accurately assessed by current techniques. Optical Coherence Tomography (OCT) is a technique, which can hypothetically provide the urologist with real-time intra-operative information on tumor grade and stage. In this pilot study the first results of OCT in grading and staging of UUT-UC are presented. Material & Methods Eight consecutive patients underwent URS for UUT-UC suspicion or follow-up. OCT datasets were intra-operatively obtained from the ureter and pyelum. All patients eventually underwent nephroureterectomy. OCT staging was performed by visual inspection ...
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  Mentions: Academic Medical Center at the University of Amsterdam Dirk J. Faber Ton G. van Leeuwen
24. OCT assisted identification of the grade of encrustation of urologic catheters
  
  Explore Conference Proceedings Jun 30 2013 Urology
  
  Introduction: Ureteric stenting is a commonly used endourologic procedure for temporary and long-term drainage of an obstructed upper urinary tract. The indication for ureteric stenting is obstruction due to intrinsic (intraureteral stones, strictures, or tumors) or extrinsic (for example compressing pelvic or retroperitoneal mass) causes. Despite the fact that stents do certainly have proven benefits in all fields of urology, there are potential morbidities. The most common problem of indwelling ureteral stents is infection. As foreign body in the urinary system, stents act as a nidus for bacteria colonization, crystallization and encrustation. Bacteria induced biofilm formation predisposes for the crystallization ...
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  Mentions: Herbert Stepp
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