Bladder tumors: virtual MR cystoscopy

Süleyman, Erdoğan; Yekeler, Ensar; Dursun, Menduh; Zorba, Unal; Tunç, Murat; Tunacı, Atadan; Acunaş, Bülent

doi:10.1007/s00261-005-0132-z

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…Authors compared these reconstructed images to conventional imaging methods revealing efficacy at a similar level (32,36,37). Moreover, due to more detailed data on periurethral tissue provided by MRU, it may play a vital role in postoperative assessment of treatment effects, in particular in post-traumatic patients with posterior urethra stricture in whom the outcomes of surgical treatment are not satisfactory.…”

Section: Mri In Assessment Of Anterior Urethral Stricturesmentioning

confidence: 99%

MRI in patients with urethral stricture: a systematic review

Frankiewicz¹,

Markiet²,

Krukowski³

et al. 2021

Diagn Interv Radiol

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U rethral stricture is one of the common male urological disorders with an increasing incidence. Patients may be asymptomatic or present with decreased urine flow, increased pressure required for urinating, a feeling of incomplete urination, urinating in a drop by drop manner and urinary retention. Moreover, ejaculation disorders, often underestimated by physicians, may be encountered, significantly influencing patients' quality of life (1).Stricture might be caused by inflammatory, traumatic, ischemic, congenital or iatrogenic factors resulting in formation of scar tissue along the tract and reducing the caliber of the urethra (2). Disease is associated with high recurrence rate. Mechanisms underlying traumatic strictures include straddle injury, pelvic fracture-related urethral injury and iatrogenic injury secondary to instrumentation also in reference to worldwide increase in endoscopical transurethral treatment methods in the last decades (3).Given that the number of patients suffering from urethral stricture disease is increasing, there is a need for improvement of diagnostic methods determining the choice of the optimal treatment method. Despite numerous surgical methods for treatment of this disease, it is still associated with high recurrence rates.Process of stricture formation is usually associated with scarring within corpus spongiosum and is known as spongiofibrosis. Histological and immunohistochemical studies showed significant changes within the structure of the strictured part of urethral wall in the microscopic images. In contrast to normal urethra wall, the epithelial layer at the site of a stricture is much thicker. Collagen and bundles of elastin are densely packed around the strictured urethra (4). Thus, the most effective method of treatment for patients with urethral stricture with extensive spongiofibrosis is excision of the whole stricture followed by an end-to-end anastomosis of the two healthy ends (5). Therefore, more and more radiologists and urologists require information on the presence of spongiofibrosis and periurethral pathologies for the correct choice of treatment method. Methods of urethral stricture evaluation UrethroscopyDespite the fact that urethroplasty has a much higher long-term success rate and better outcomes in terms of recurrence rate than dilatations and urethrotomies, minimally invasi-ABSTRACT Magnetic resonance imaging (MRI) is gaining acceptance as a diagnostic tool in urethral stricture disease. Numerous publications emphasize on the advantages of MRI including its ability to determine periurethral spongiofibrosis, thus overcoming the main limitation of retrograde urethrography (RUG). It is also becoming an alternative for sonourethrography (SUG), which is a highly subjective examination. Magnetic resonance urethrography (MRU) has become an increasingly appreciated tool for diagnosing patients with urethral stricture disease. Obtained data provides radiologists and urethral reconstructive surgeons with additional information regarding anatomical relationships a...

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Section: Mri In Assessment Of Anterior Urethral Stricturesmentioning

confidence: 99%

MRI in patients with urethral stricture: a systematic review

Frankiewicz¹,

Markiet²,

Krukowski³

et al. 2021

Diagn Interv Radiol

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“…Studies have described clinical applications of virtual endoscopy to visualize the inside of the bronchi, paranasal sinus, stomach, bladder, small intestine, pancreatic duct, bile duct, and spine (2,6,8,10,11,16,19,21,23,24). Shigematsu et al (20) reported the use of virtual intravascular MR endoscopy for aneurysms in three cases.…”

Section: Incesu L Et Al: Mr Endoscopy In Cerebral Aneurysmsmentioning

confidence: 99%

“…Studies have described clinical applications of virtual endoscopy to visualize the inside of the tracheobronchial tree, paranasal sinus, stomach, bladder, small intestine, pancreatic duct, bile duct, and spine (2,(6)(7)(8)10,11,16,19,21,23,24). Virtual endoscopy used for preoperative planning in neurosurgery for endoscopic third ventriculostomy, nasal cavity and paranasal sinus surgery, and virtual endoscopy visualization of the sphenoid sinus and important adjacent structures is valuable for training and the preoperative planning of endonasal transsphenoidal surgery (15).…”

Section: Incesu L Et Al: Mr Endoscopy In Cerebral Aneurysmsmentioning

confidence: 99%

“…These imaging protocols allow patients to undergo a "virtual endoscopy" (27). Virtual MR endoscopic techniques are used to gain an image display using computer processing of 3D data sets to provide a simulated visualization of a patient's hollow organs similar to that produced by standard endoscopes (16,23,27).…”

Section: Incesu L Et Al: Mr Endoscopy In Cerebral Aneurysmsmentioning

confidence: 99%

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Intravascular virtual MR endoscopy evaluation of cerebral aneurysms

İncesu

Aslan²,

Polat³

et al. 2013

Turkish Neurosurgery

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AIm:The aim of this study was to evaluate the role of intravascular virtual MR endoscopy in the planning of correct surgical clipping of the aneurysm neck. mATeRIAL and meTHods: A total of 36 aneurysms were detected by using magnetic resonance angiography (MRA) in thirty patients. Intravascular virtual MR endoscopy is a realistic 3-dimensional simulation of intravascular structures that is generated by postprocessing of MRA maximum-intensity projection images. The images were evaluated by two neuroradiologists, in terms of image quality via qualitative analysis of MRA and intravascular virtual MR endoscopy of the orifice of the aneurysm neck, as well as the relationship of the main and bifurcating arteries with the orifice of the aneurysm. The readers were fully blinded. Mann-Whitney U test was used to compare the differences in mean scores for each reader between these two groups.ResuLTs: Based on the scoring system, evaluating image quality using qualitative analysis, both readers found the mean scores to be 3.82 ± 0.52 and 3.91 ± 0.72 for intravascular virtual MR endoscopy, and 2.97 ± 0.71 and 2.89 ± 0.83 for MRA, which was statistically different (p<0.001).CoNCLusIoN: Intravascular virtual MR endoscopy may provide useful knowledge in the proper the surgical clipping of the aneurysm neck.KeywoRds: Cerebral aneurysm, Intravascular virtual MR endoscopy, Magnetic resonance angiography ÖZ AmAÇ: Bu çalışmanın amacı, anevrizma boynunun doğru cerrahi kliplenmesinin planlanmasında intravasküler sanal MR endoskopinin rolünü değerlendirmektir. yÖNTem ve GeReÇLeR: 30 hastada 36 anevrizma magnetik rezonans anjiyografi (MRA) kullanılarak ortaya çıkarıldı. İntravasküler sanal MR endoskopi, MRA maximum-intensity projeksiyon görüntülemenin işlenmesinden üretilen intravasküler yapıların gerçekçi 3 boyutlu simülasyonudur. İki nöroradyolog tarafından MRA ve intravasküler sanal MR endoskopide anevrizma boynunun orifisi ve anevrizmanın orifisi ile bifurkasyon arter ve ana arterin ilişkisi kalitatif analiz vasıtasıyla görüntü kalitesi açısından değerlendirildi. İki okuyucu tamamen bağımsızdı. Bu iki grup arasındaki her bir okuyucu için ortalama puan farkının anlamlılığına Mann-Whitney testi ile karşılaştırıldı.BuLGuLAR: Kalitatif analiz kullanılarak görüntü kalitesini puanlama sistemine göre değerlendirilmesinde her iki okuyucu intravasküler sanal MR endoskopi için 3.82 ± 0.52 ve 3.91 ± 0.72; MRA için 2.97 ± 0.71 ve 2.89 ± 0.83 ortalama skora sahipti ve bu fark istatistiksel olarak anlamlıydı (p<0.001).soNuÇ: İntravasküler sanal MR endoskopi anevrizma boynunun uygun cerrahi kliplenmesinde faydalı bilgi sağlayabilir.ANAHTAR sÖZCÜKLeR: Serebral anevrizma, İntravasküler sanal MR endoskopi, Magnetik rezonans anjiyografi

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“…The early detection of bladder cancer is extremely important. With recent advances in imaging and visualization techniques, virtual cystoscopy (VCy), which is based on volumetric computed tomography (CT) or magnetic resonance (MR) imaging data, has revealed its potentials for detecting bladder abnormalities [2]. As reported in [3], bladder cancerous tissue invades gradually from the mucosa into the wall muscles, inducing morphological changes and texture changes in the bladder wall.…”

Section: Introductionmentioning

confidence: 99%

An efficient sampling algorithm for uncertain abnormal data detection in biomedical image processing and disease prediction

Liu

Zhang

Jia

2015

BME

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Abstract. In this paper, we propose a computer information processing algorithm that can be used for biomedical image processing and disease prediction. A biomedical image is considered a data object in a multi-dimensional space. Each dimension is a feature that can be used for disease diagnosis. We introduce a new concept of the top (k1, k2) outlier. It can be used to detect abnormal data objects in the multi-dimensional space. This technique focuses on uncertain space, where each data object has several possible instances with distinct probabilities. We design an efficient sampling algorithm for the top (k1, k2) outlier in uncertain space. Some improvement techniques are used for acceleration. Experiments show our methods' high accuracy and high efficiency.

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Bladder tumors: virtual MR cystoscopy

Cited by 12 publications

References 23 publications

MRI in patients with urethral stricture: a systematic review

MRI in patients with urethral stricture: a systematic review

Intravascular virtual MR endoscopy evaluation of cerebral aneurysms

An efficient sampling algorithm for uncertain abnormal data detection in biomedical image processing and disease prediction

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