Virtual Endoscopy: Navigation within Pelvicaliceal System

Liatsikos, Evangelos; Siablis, Dimitrios; Kagadis, George C.; Karnabatidis, Dimitrios; Petsas, Theodore; Kalogeropoulou, Christina; Voudoukis, Theodore; Athanassopoulos, A.; Perimenis, Petros; Nikiforidis, George; Barbalias, George A.

doi:10.1089/end.2005.19.37

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…Moreover, two and three-dimensional (2D, 3D) images generated by CT data, provide additional information regarding airway pathology. A variety of computer processing algorithms can be applied in CT acquired data such as: multiplanar reformatting (MPR), shaded surface display (SSD), maximum or minimum intensity projection (MIP), volume rendering techniques (VRT) and more recently virtual endoscopy (VE) [5-12]. …”

Section: Introductionmentioning

confidence: 99%

Tumoral and non-tumoral trachea stenoses: evaluation with three-dimensional CT and virtual bronchoscopy

Koletsis

Kalogeropoulou

Prodromaki

et al. 2007

J Cardiothorac Surg

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Section: Introductionmentioning

confidence: 99%

Tumoral and non-tumoral trachea stenoses: evaluation with three-dimensional CT and virtual bronchoscopy

Koletsis

Kalogeropoulou

Prodromaki

et al. 2007

J Cardiothorac Surg

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“…MRVE is a useful method to visualize the anatomy of the lumina of the gallbladder, bile duct, and pancreatic duct and can also be applied to other clinical procedures, such as visualization of vascular compression of the cranial nerve and navigation for laparoscopic surgery. 10,11 However, the threshold setting on the workstation is critical to obtain useful MRVE images. Because the appearance of the lumen on the MRVE images depends on the threshold setting, optimized threshold is essential.…”

Section: Discussionmentioning

confidence: 99%

MR Virtual Endoscopy for Biliary Tract and Pancreatic Duct

Azuma

Yamaguchi

Iida

et al. 2007

MRMS

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Developments in magnetic resonance (MR) equipment and techniques have been remarkable. Especially, respiratory-triggered three-dimensional MR cholangiopancreatography (3D-MRCP) has been developed to provide images with high spatial resolution of the biliary tract and pancreatic duct. These 3D data can be employed in MR virtual endoscopy (MRVE) with volume rendering to visualize the lumina of the gallbladder, bile duct, and pancreatic duct. To observe the changes in the lumina with threshold settings on a workstation, we made an original phantom with tubes 2, 3, and 6 mm in internal diameter. We examined the changes in luminal diameter using several threshold settings by comparing the actual internal diameters to determine an appropriate threshold setting, which we then applied in 50 clinical cases, including pancreatic tumors, hepatic tumors, and biliary tract stones. We obtained MRVE images of the gallbladder, bile duct, and pancreatic duct to assess the clinical usefulness of this method. In the phantom study, a value identical to the actual luminal diameter could be obtained with a threshold of less than 20z. In all clinical cases, we obtained MRVE images of the gallbladder, bile duct, and pancreatic duct using the threshold we had determined appropriate and scored the diagnostic usefulness in each region. The MRVE images of the biliary tract provided much supplementary information, including the presence of stones and of duct invasion by the malignancy as wells as visualization of the post-stenotic portion. MRVE images of the gall bladder did not signiˆcantly improve diagnosis (P＝0.311), but those of the bile and pancreatic ducts did (Pº0.05). In addition, MRVE may aid navigation during cholangioscopy. Thus, MRVE is a clinically useful technique for examining lesions of the biliary tract and pancreas.

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“…The benefits of virtual endoscopy and cystoscopy are that they contain information regarding the wall of the bladder 34 and the blind spot of endoscopy; 35 however, disadvantages of virtual cystoscopy include failure to depict the ureteric orifices or urethral stricture 36 and in detecting subtle mucosal change. 28 CT virtual endoscopy has been applied to the upper urinary tract, [37][38][39] and even to the pelvicaliceal system 40 with satisfactory sensitivity and specificity in tumor detection, 37 although there is difficulty detecting lesions smaller than 0.5 cm 39 and carcinoma in situ. 37 In addition, image processing and browsing the animation of the entire ureter is time-consuming; 40 these limitations limit the applicability of CT virtual ureteroscopy in routine clinical practice.…”

Section: Virtual Endoscopy and Actual Endoscopic Image Processingmentioning

confidence: 99%

“…CT virtual endoscopy has been applied to the upper urinary tract, 37–39 and even to the pelvicaliceal system 40 with satisfactory sensitivity and specificity in tumor detection, 37 although there is difficulty detecting lesions smaller than 0.5 cm 39 and carcinoma in situ 37 . In addition, image processing and browsing the animation of the entire ureter is time‐consuming; 40 these limitations limit the applicability of CT virtual ureteroscopy in routine clinical practice.…”

Section: Virtual Endoscopy and Actual Endoscopic Image Processingmentioning

confidence: 99%

Computer‐based endoscopic image‐processing technology for endourology and laparoscopic surgery

2009

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Endourology and laparoscopic surgery are evolving in accordance with developments in instrumentation and progress in surgical technique. Recent advances in computer and image-processing technology have enabled novel images to be created from conventional endoscopic and laparoscopic video images. Such technology harbors the potential to advance endourology and laparoscopic surgery by adding new value and function to the endoscope. The panoramic and three-dimensional images created by computer processing are two outstanding features that can address the shortcomings of conventional endoscopy and laparoscopy, such as narrow field of view, lack of depth cue, and discontinuous information. The wide panoramic images show an anatomical 'map' of the abdominal cavity and hollow organs with high brightness and resolution, as the images are collected from video images taken in a close-up manner. To assist in laparoscopic surgery, especially in suturing, a three-dimensional movie can be obtained by enhancing movement parallax using a conventional monocular laparoscope. In tubular organs such as the prostatic urethra, reconstruction of three-dimensional structure can be achieved , implying the possibility of a liquid dynamic model for assessing local urethral resistance in urination. Computer-based processing of endoscopic images will establish new tools for endourology and laparoscopic surgery in the near future.

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Virtual Endoscopy: Navigation within Pelvicaliceal System

Abstract: Virtual endoscopy enabled the creation of endoluminal views of the renal pelvis and calices from spiral tomographic images, thereby allowing diagnostic-preoperative and postoperative evaluation of the pelvicaliceal unit.

Cited by 9 publications

References 13 publications

Tumoral and non-tumoral trachea stenoses: evaluation with three-dimensional CT and virtual bronchoscopy

Tumoral and non-tumoral trachea stenoses: evaluation with three-dimensional CT and virtual bronchoscopy

MR Virtual Endoscopy for Biliary Tract and Pancreatic Duct

Computer‐based endoscopic image‐processing technology for endourology and laparoscopic surgery

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