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Virtual Colonography

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https://www.readbyqxmd.com/read/27854032/haustral-loop-extraction-for-ct-colonography-using-geodesics
#1
Yongkai Liu, Chaijie Duan, Jerome Liang, Jing Hu, Hongbing Lu, Mingyue Luo
PURPOSE: The human colon has complex geometric structures because of its haustral folds, which are thin flat protrusions on the colon wall. The haustral loop is the curve (approximately triangular in shape) that encircles the highly convex region of the haustral fold, and is regarded as the natural landmark of the colon, intersecting the longitude of the colon in the middle. Haustral loop extraction can assist in reducing the structural complexity of the colon, and the loops can also serve as anatomic markers for computed tomographic colonography (CTC)...
November 16, 2016: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/27255132/diagnostic-value-of-computed-tomography-colonography-ctc-after-incomplete-optical-colonoscopy
#2
N Maggialetti, R Capasso, D Pinto, M Carbone, A Laporta, S Schipani, C L Piccolo, M Zappia, A Reginelli, M D'Innocenzo, L Brunese
INTRODUCTION: This study evaluated the role of computed tomography colonography (CTC) in patients who previously underwent incomplete optical colonoscopy (OC). We analyzed the impact of colonic lesions in intestinal segments not studied by OC and extracolonic findings in these patients. METHODS: Between January 2014 and May 2015, 61 patients with a history of abdominal pain and incomplete OC examination were studied by CTC. CTCs were performed by 320-row CT scan in both the supine and the prone position, without intravenous administration of contrast medium...
September 2016: International Journal of Surgery
https://www.readbyqxmd.com/read/27022217/ultrasound-virtual-endoscopy-polyp-detection-and-reliability-of-measurement-in-an-in-vitro-study-with-pig-intestine-specimens
#3
Jin-Ya Liu, Li-Da Chen, Hua-Song Cai, Jin-Yu Liang, Ming Xu, Yang Huang, Wei Li, Shi-Ting Feng, Xiao-Yan Xie, Ming-De Lu, Wei Wang
AIM: To present our initial experience regarding the feasibility of ultrasound virtual endoscopy (USVE) and its measurement reliability for polyp detection in an in vitro study using pig intestine specimens. METHODS: Six porcine intestine specimens containing 30 synthetic polyps underwent USVE, computed tomography colonography (CTC) and optical colonoscopy (OC) for polyp detection. The polyp measurement defined as the maximum polyp diameter on two-dimensional (2D) multiplanar reformatted (MPR) planes was obtained by USVE, and the absolute measurement error was analyzed using the direct measurement as the reference standard...
March 28, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/26568305/preoperative-staging-of-resectability-of-colon-cancer-using-virtual-colonoscopy-correlation-with-surgical-results-our-experience
#4
Luciano Izzo, Luca Impara, Federico Pugliese, Monir Al Mansour, Francesco De Felice, Carlo De Dominicis, Anna De Santis, Carlo De Felice, Raimondo Gabriele, Luigi Basso, Pierfrancesco Di Cello, Maria Caputo, Paolo Izzo
PURPOSE: To evaluate the clinical usefulness of preoperative computed tomography colonography (CTC) in locoregional staging in patients with abdominal pain secondary toocclusive colorectal cancer (CRC). MATERIALS AND METHODS: 80 patients with abdominal pain underwent CTC initially without contrast and after diagnosis with contrast. 47 patients had distal CRC and 33 had proximal CRC. CTimages were analyzed independently by two radiologists, using MPR reconstruction and VR images...
2015: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/26369263/a-case-of-colon-cancer-associated-with-ulcerative-colitis-evaluation-using-ct-colonography
#5
Tamaki Ichikawa, Sotaro Sadahiro, Hiroki Yuhara, Takayoshi Suzuki, Muneki Igarashi, Tetsuya Mine, Sakura Tomita, Yutaka Imai
A 29-year-old female with ulcerative colitis was found to have advanced sigmoid colon cancer on colonoscopy. Computed tomography (CT) was performed after colonoscopy for the evaluation of metastasis. CT colonography (CTC) could be understood adding carbon dioxide because of soon after colonoscopic examination. Images of CTC were evaluated by two- and three-dimensional images including virtual endoscopic, virtual colon dissection and air images, and then compared with conventional endoscopic images. Virtual endoscopic images of flat elevated cancer with shallow ulcer were similar to those findings by conventional endoscopy...
September 2015: Tokai Journal of Experimental and Clinical Medicine
https://www.readbyqxmd.com/read/26298421/the-role-of-virtual-colonoscopy-in-colorectal-screening
#6
Jay D Patel, Kevin J Chang
Colorectal cancer is the second leading cause of cancer-related deaths in the United States. The earlier colorectal cancer is detected, the better chance a person has of surviving 5 years after being diagnosed, emphasizing the need for effective and regular colorectal screening. Computed tomographic colonography has repeatedly demonstrated sensitivities equivalent to the current gold standard, optical colonoscopy, in the detection of clinically relevant polyps. It is an accurate, safe, affordable, available, reproducible, quick, and cost-effective option for colorectal screening and should be considered for mass screening...
March 2016: Clinical Imaging
https://www.readbyqxmd.com/read/26236781/application-of-pseudo-enhancement-correction-to-virtual-monochromatic-ct-colonography
#7
Rie Tachibana, Janne J Näppi, Hiroyuki Yoshida
In CT colonography, orally administered positive-contrast fecal-tagging agents are used for differentiating residual fluid and feces from true lesions. However, the presence of high-density tagging agent in the colon can introduce erroneous artifacts, such as local pseudo-enhancement and beam-hardening, on the reconstructed CT images, thereby complicating reliable detection of soft-tissue lesions. In dual-energy CT colonography, such image artifacts can be reduced by the calculation of virtual monochromatic CT images, which provide more accurate quantitative attenuation measurements than conventional single-energy CT colonography...
September 2014: Abdominal Imaging: ABDI 2014
https://www.readbyqxmd.com/read/26236780/information-preserving-pseudo-enhancement-correction-for-non-cathartic-low-dose-dual-energy-ct-colonography
#8
Janne J Näppi, Rie Tachibana, Daniele Regge, Hiroyuki Yoshida
In CT colonography (CTC), orally administered positive-contrast fecal-tagging agents can cause artificial elevation of the observed radiodensity of adjacent soft tissue. Such pseudo-enhancement makes it challenging to differentiate polyps and folds reliably from tagged materials, and it is also present in dual-energy CTC (DE-CTC). We developed a method that corrects for pseudo-enhancement on DE-CTC images without distorting the dual-energy information contained in the data. A pilot study was performed to evaluate the effect of the method visually and quantitatively by use of clinical non-cathartic low-dose DE-CTC data from 10 patients including 13 polyps covered partially or completely by iodine-based fecal tagging...
September 2014: Abdominal Imaging: ABDI 2014
https://www.readbyqxmd.com/read/26023619/role-of-ct-colonography-in-colonic-lesions-and-its-correlation-with-conventional-colonoscopic-findings
#9
Kunwarpal Singh, Aparna Kaur Narula, Chuni Lal Thukral, Neeti Rajan Singh, Amandeep Singh, Harmeet Kaur
BACKGROUND: Preoperative evaluation in patients with colorectal carcinoma is essential for a correct therapeutic plan. Conventional colonoscopy has certain limitations including its inability to detect synchronous lesions in case of distal obstructive mass and inaccurate tumour localization. CT colonography combines cross sectional imaging with virtual colonoscopic images and offers a comprehensive preoperative evaluation in patients with colorectal carcinoma including detection of synchronous lesions with accurate segmental localization and loco regional staging...
April 2015: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/26004605/preoperative-staging-of-colorectal-cancer-using-virtual-colonoscopy-correlation-with-surgical-results
#10
A Stagnitti, F Barchetti, G Barchetti, E Pasqualitto, A Sartori, M Glorioso, S Gigli, V Buonocore, M L Monti, A Marini, C Mele, F Stagnitti, A Laghi
OBJECTIVE: The aim of this study was to evaluate the clinical usefulness of computed tomography colonography (CTC) in the preoperative staging in patients with abdominal pain for occlusive colorectal cancer (CRC) and to compare the results of CTC with the surgical ones. PATIENTS AND METHODS: 127 patients with abdominal pain, iron deficiency anemia and occlusive CRC underwent a CTC examination in prone position without intravenous contrast agent and in prone position after administration of intravenous contrast medium...
2015: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/25918480/a-comparison-of-material-decomposition-techniques-for-dual-energy-ct-colonography
#11
Radin A Nasirudin, Rie Tachibana, Janne J Näppi, Kai Mei, Felix K Kopp, Ernst J Rummeny, Hiroyuki Yoshida, Peter B Noël
In recent years, dual-energy computed tomography (DECT) has been widely used in the clinical routine due to improved diagnostics capability from additional spectral information. One promising application for DECT is CT colonography (CTC) in combination with computer-aided diagnosis (CAD) for detection of lesions and polyps. While CAD has demonstrated in the past that it is able to detect small polyps, its performance is highly dependent on the quality of the input data. The presence of artifacts such as beam-hardening and noise in ultra-low-dose CTC may severely degrade detection performances of small polyps...
February 21, 2015: Proceedings—Society of Photo-Optical Instrumentation Engineers
https://www.readbyqxmd.com/read/25844029/electronic-cleansing-for-dual-energy-ct-colonography-based-on-material-decomposition-and-virtual-monochromatic-imaging
#12
Rie Tachibana, Janne J Näppi, Se Hyung Kim, Hiroyuki Yoshida
CT colonography (CTC) uses orally administered fecal-tagging agents to enhance retained fluid and feces that would otherwise obscure or imitate polyps on CTC images. To visualize the complete region of colon without residual materials, electronic cleansing (EC) can be used to perform virtual subtraction of the tagged materials from CTC images. However, current EC methods produce subtraction artifacts and they can fail to subtract unclearly tagged feces. We developed a novel multi-material EC (MUMA-EC) method that uses dual-energy CTC (DE-CTC) and machine-learning methods to improve the performance of EC...
March 20, 2015: Proceedings—Society of Photo-Optical Instrumentation Engineers
https://www.readbyqxmd.com/read/25805184/the-italian-consensus-to-virtual-colonoscopy
#13
Ennio Biscaldi, Roberto Di Mizio, Davide Bellini, Nicola Flor, Franco Iafrate, Gabriella Jussich, Emanuele Neri, Daniele Regge, Andrea Laghi
OBJECTIVES: To produce an informed consent for CT colonography (CTC), to be diffused by the Italian Society of Radiology, aimed to make patients and referring physicians aware of CTC examination protocol, advantages and disadvantages, limits and potential related risks. MATERIALS AND METHODS: Delphi method was used to create a consensus among experts on an informed consent for CTC. The overall agreement among different consulted specialists was evaluated and ranked using the Cronbach's correlation coefficient (α) at two time points: after the first and the second 'round' of consultation...
October 2015: La Radiologia Medica
https://www.readbyqxmd.com/read/25801105/endoscopic-training-in-gastroenterology-fellowship-adherence-to-core-curriculum-guidelines
#14
Pichamol Jirapinyo, Avlin B Imaeda, Christopher C Thompson
BACKGROUND: The Gastroenterology Core Curriculum and American Society of Gastrointestinal Endoscopy provide guidelines for endoscopic training. Program adherence to these recommendations is unclear. This study aims to assess endoscopic training experience during fellowship. METHODS: HASH(0x45da000) DESIGN: Questionnaire study. SETTING: The questionnaire was circulated to US fellowship programs, with the assistance of the American Gastroenterological Association...
December 2015: Surgical Endoscopy
https://www.readbyqxmd.com/read/25630322/staging-of-colorectal-cancer-using-contrast-enhanced-multidetector-computed-tomographic-colonography
#15
Srikala Narayanan, Naveen Kalra, Anmol Bhatia, Jaidev Wig, Surinder Rana, Deepak Bhasin, Kim Vaiphei, Niranjan Khandelwal
INTRODUCTION: Preoperative staging is essential for the optimal treatment and surgical planning of colorectal cancers. This study was aimed to evaluate the accuracy of colorectal cancer staging done using contrast-enhanced multidetector computed tomographic colonography (CEMDCTC). METHODS: We recruited 25 patients with 28 proven colorectal cancers. A 16-slice multidetector computed tomography scanner was used to generate two-dimensional multiplanar reformatted sagittal, coronal and oblique coronal images, and three-dimensional virtual colonography (endoluminal) images...
December 2014: Singapore Medical Journal
https://www.readbyqxmd.com/read/25586090/colon-pillcam-why-not-just-take-a-pill
#16
REVIEW
Rami Eliakim, Samuel N Adler
This review article deals with the clinical value of capsule endoscopy for visualization of the colon. Since its introduction in 2006, the colon capsule endoscopy underwent major technological improvements. The improved performance of colon capsule endoscopy is reviewed based on three multicenter prospective studies. Screening patients for colonic adenomatous polyps is reasonable in patients who are unwilling to undergo conventional colonoscopy. Another prospective study proved that colon capsule endoscopy is effective in incomplete colonoscopy...
March 2015: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/25516670/laterally-spreading-tumors-limitations-of-computed-tomography-colonography
#17
Kazutomo Togashi, Kenichi Utano, Shigeyoshi Kijima, Yosuke Sato, Hisanaga Horie, Keijirou Sunada, Alan T Lefor, Hideharu Sugimoto, Yoshikazu Yasuda
AIM: To prospectively investigate the detection rate of laterally spreading tumors (LSTs) of the colorectum by computed tomography (CT) colonography (CTC). METHODS: Patients with LSTs measuring ≥ 20 mm detected during colonoscopy were prospectively enrolled in the study. All patients underwent colonoscopy and subsequent CTC on the same day. CTC was performed using multi-detector CT without contrast in the prone and supine positions. Two radiologists blinded to the existence of LSTs read the virtual endoscopic images as well as 2-D images...
December 14, 2014: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/25485385/colon-flattening-by-landmark-driven-optimal-quasiconformal-mapping
#18
Wei Zeng, Yi-Jun Yang
In virtual colonoscopy, colon conformal flattening plays an important role, which unfolds the colon wall surface to a rectangle planar image and preserves local shapes by conformal mapping, so that the cancerous polyps and other abnormalities can be easily and thoroughly recognized and visualized without missing hidden areas. In such maps, the anatomical landmarks (taeniae coli, flexures, and haustral folds) are naturally mapped to convoluted curves on 2D domain, which poses difficulty for comparing shapes from geometric feature details...
2014: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/25442353/dual-energy-ct-colonography-for-preoperative-one-stop-staging-in-patients-with-colonic-neoplasia
#19
Benno Schaeffer, Thorsten R C Johnson, Thomas Mang, Martin E Kreis, Maximilian F Reiser, Anno Graser
RATIONALE AND OBJECTIVES: To evaluate the benefits of dual-energy computed tomography (CT) colonography (DECTC) as a preoperative staging tool in patients with clinically suspected colorectal cancer (CRC). MATERIALS AND METHODS: Twenty-two patients with colorectal neoplasia underwent preoperative abdominal DECTC on a dual-source scanner (SOMATOM Definition Flash; Siemens) operated at tube potentials of Sn140/100 kVp. Scans were evaluated for local tumor stage and the presence of synchronous intracolonic and extracolonic findings using dual-energy color-coded images...
December 2014: Academic Radiology
https://www.readbyqxmd.com/read/25438299/multilabel-region-classification-and-semantic-linking-for-colon-segmentation-in-ct-colonography
#20
Xiaoyun Yang, Xujiong Ye, Greg Slabaugh
Accurate and automatic colon segmentation from CT images is a crucial step of many clinical applications in CT colonography, including computer-aided detection (CAD) of colon polyps, 3-D virtual flythrough of the colon, and prone/supine registration. However, the existence of adjacent air-filled organs such as the lung, stomach, and small intestine, and the collapse of the colon due to poor insufflation, render accurate segmentation of the colon a difficult problem. Extra-colonic components can be categorized into two types based on their 3-D connection to the colon: detached and attached extracolonic components (DEC and AEC, respectively)...
March 2015: IEEE Transactions on Bio-medical Engineering
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